Zero Warnings Plan

Zero GHC warnings with new opts. General cleanup and updates.

.gitignore

@@ -6,6 +6,7 @@
 /Dockerfile
 /config.dhall
 /result
+.aider*
 WD
 bin/
 dist*

AGENTS.md

@@ -0,0 +1,177 @@
+# AGENTS.md — tricu Project Guide
+
+> For AI agents and contributors working in this repository.
+
+## 1. Build & Test
+
+**`nix build .#` always runs tests.** This is the primary and only way to build and validate.
+
+```bash
+# Full build + tests (this is the default)
+nix build .#
+
+# Build only (skip tests)
+nix build .#package
+
+# Build the test-specific variant with doCheck enforced
+nix build .#test
+nix flake check
+
+# Dev shell (includes ghcid, cabal-install, ghc, upx)
+nix develop .#
+```
+
+### ⚠️ Never call `cabal` directly
+
+This project uses a Nix flake that wraps `callCabal2nix` to produce the cabal package. All compilation, linking, and test execution are driven through Nix. Running `cabal build`, `cabal test`, `cabal repl`, or `cabal install` directly will use the system GHC (or `.stack-work`) and can produce artifacts that differ from the Nix-built ones — especially regarding `megaparsec` which is a project dependency.
+
+> **Rule of thumb:** if it builds, links, or tests, it goes through `nix`.
+
+## 2. Project Overview
+
+**tricu** (pronounced "tree-shoe") is a programming-language experiment written in Haskell. It implements [Triage Calculus](https://olydis.medium.com/a-visual-introduction-to-tree-calculus-2f4a34ceffc2), an extension of Barry Jay's Tree Calculus, with lambda-abstraction sugar that gets eliminated back to pure tree calculus terms.
+
+tricu is Lojban for "tree".
+
+### Core types (in `src/Research.hs`)
+
+| Type | Description |
+|------|-------------|
+| `T = Leaf \| Stem T \| Fork T T` | Tree Calculus term (the runtime value) |
+| `TricuAST` | Parsed AST with `SDef`, `SApp`, `SLambda`, etc. |
+| `LToken` | Lexer tokens |
+| `Node` / `MerkleHash` | Content-addressed Merkle DAG nodes |
+
+### Source modules
+
+| Module | Purpose |
+|--------|---------|
+| `Main.hs` | CLI entry point (`cmdargs`), three modes: `repl`, `eval`, `decode` |
+| `Eval.hs` | Interpreter: `evalTricu`, `result`, `evalSingle` |
+| `Parser.hs` | Megaparsec parser → `TricuAST` |
+| `Lexer.hs` | Megaparsec lexer → `LToken` |
+| `FileEval.hs` | File loading, module imports, `!import` |
+| `REPL.hs` | Interactive Read-Eval-Print Loop (haskeline) |
+| `Research.hs` | Core types, `apply` reduction, booleans, marshalling (`ofString`, `ofNumber`), output formatters (`toAscii`, `toTernaryString`, `decodeResult`) |
+| `ContentStore.hs` | SQLite-backed term persistence |
+
+### File extensions
+
+- `.hs` — Haskell source
+- `.tri` — tricu language source (used in `lib/`, `test/`, `demos/`)
+
+## 3. Test Suite
+
+Tests live in `test/Spec.hs` and use **Tasty** + **HUnit**.
+
+```bash
+nix flake check   # or: nix build .#test
+```
+
+### Test groups
+
+| Group | What it covers |
+|-------|----------------|
+| `lexer` | Megaparsec lexer — identifiers, keywords, strings, escapes, invalid tokens |
+| `parser` | Parser — defs, lambda, applications, lists, comments, parentheses |
+| `simpleEvaluation` | Core `apply` reduction rules, variable substitution, immutability |
+| `lambdas` | Lambda elimination, SKI calculus, higher-order functions, currying, shadowing, free vars |
+| `providedLibraries` | `lib/list.tri` — triage, booleans, list ops (`head`, `tail`, `map`, `emptyList?`, `append`, `equal?`) |
+| `fileEval` | Loading `.tri` files, multi-file context, decode |
+| `modules` | `!import`, cyclic deps, namespacing, multi-level imports, unresolved vars, local namespaces |
+| `demos` | `demos/*.tri` — structural equality, `toSource`, `size`, level-order traversal |
+| `decoding` | `decodeResult` — Leaf, numbers, strings, lists, mixed |
+| `elimLambdaSingle` | Lambda elimination: eta reduction, SDef binding, semantics preservation |
+| `stressElimLambda` | Lambda elimination stress test: 200 vars, 800-body curried lambda |
+
+### Adding tests
+
+1. Append a `testCase "Description" $ do ...` block to the appropriate test group in `test/Spec.hs`.
+2. Import any modules you need (lexer/parser are available via `runParser` from `Text.Megapparsec`; evaluation via `evalTricu`, `parseTricu`, `result`).
+3. Run `nix flake check` to verify.
+
+> The test-suite in `tricu.cabal` pulls in `src/` as `hs-source-dirs`, so tests import modules directly (e.g., `import Eval`, `import Lexer`). This is intentional — tests exercise the full pipeline end-to-end.
+
+## 4. tricu Language Quick Reference
+
+```
+t                      → Leaf (the base term)
+t t                    → Stem Leaf
+t t t                  → Fork Leaf Leaf
+
+x = t                  → Define term x = Leaf
+id = (a : a)           → Lambda identity (eliminates to tree calculus)
+head (map f xs)        → From lib/list.tri
+
+!import "./path.tri" NS  → Import file under namespace
+
+-- line comment
+|- block comment -|
+```
+
+## 5. Output Formats
+
+The `eval` command accepts `--form` (shorthand `-t`):
+
+| Format | Value | Description |
+|--------|-------|-------------|
+| `tree` | `TreeCalculus` | Simple `t` form (default) |
+| `fsl` | `FSL` | Full show representation |
+| `ast` | `AST` | Parsed AST representation |
+| `ternary` | `Ternary` | Ternary string encoding |
+| `ascii` | `Ascii` | ASCII-art tree diagram |
+| `decode` | `Decode` | Human-readable (strings, numbers, lists) |
+
+## 6. Content Addressing
+
+Each `T` term is content-addressed via a Merkle DAG:
+
+```
+NLeaf       → 0x00
+NStem(h)    → 0x01 || h (32 bytes)
+NFork(l,r)  → 0x02 || l (32 bytes) || r (32 bytes)
+
+hash = SHA256("tricu.merkle.node.v1" <> 0x00 <> serialized_node)
+```
+
+This is stored in SQLite via `ContentStore.hs`. Hash suffixes on identifiers (e.g., `foo_abc123...`) are validated: 16–64 hex characters (SHA256).
+
+## 7. Directory Layout
+
+```
+tricu/
+├── flake.nix           # Nix flake: packages, tests, devShell
+├── tricu.cabal         # Cabal package (used via callCabal2nix)
+├── src/                # Haskell modules
+│   ├── Main.hs
+│   ├── Eval.hs
+│   ├── Parser.hs
+│   ├── Lexer.hs
+│   ├── FileEval.hs
+│   ├── REPL.hs
+│   ├── Research.hs
+│   └── ContentStore.hs
+├── test/
+│   ├── Spec.hs         # Tasty + HUnit tests
+│   ├── *.tri           # tricu test programs
+│   └── local-ns/       # Module namespace test files
+├── lib/
+│   ├── base.tri
+│   ├── list.tri
+│   └── patterns.tri
+├── demos/
+│   ├── equality.tri
+│   ├── size.tri
+│   ├── toSource.tri
+│   ├── levelOrderTraversal.tri
+│   └── patternMatching.tri
+└── AGENTS.md           # This file
+```
+
+## 8. Development Tips
+
+- **Quick iteration:** `nix develop` then `ghcid` (provided in the devShell) watches files and re-runs.
+- **REPL:** `nix run .#` starts the interactive REPL.
+- **Evaluate files:** `nix run .# -- eval -f demos/equality.tri`
+- **GHC options:** `-threaded -rtsopts -with-rtsopts=-N` for parallel runtime. Use `-N` RTS flag for multi-core.
+- **Upx** is in the devShell for binary compression if needed.

README.md

@@ -2,17 +2,17 @@
 
 ## Introduction
 
-tricu (pronounced "tree-shoe") is a purely functional interpreted language implemented in Haskell. It is fundamentally based on the application of [Tree Calculus](https://github.com/barry-jay-personal/typed_tree_calculus/blob/main/typed_program_analysis.pdf) terms, but minimal syntax sugar is included.
-
-*This experiment has concluded. tricu will see no further development or bugfixes.*
+tricu (pronounced "tree-shoe") is a programming language experiment in Haskell. It is fundamentally based on the application of [Triage Calculus](https://olydis.medium.com/a-visual-introduction-to-tree-calculus-2f4a34ceffc2), an extended form of [Tree Calculus](https://github.com/barry-jay-personal/typed_tree_calculus/blob/main/typed_program_analysis.pdf), terms, but minimal syntax sugar is included.
 
 tricu is the word for "tree" in Lojban: `(x1) is a tree of species/cultivar (x2)`.
 
 ## Acknowledgements 
 
-Tree Calculus was discovered by [Barry Jay](https://github.com/barry-jay-personal/blog). 
+Tree Calculus was discovered by [Barry Jay](https://github.com/barry-jay-personal/blog). The addition of Triage rules were suggested by [Johannes Bader](https://johannes-bader.com/). Johannes is also the creator of [treecalcul.us](https://treecalcul.us) which has a great intuitive code playground using his language LambAda.
 
-[treecalcul.us](https://treecalcul.us) is an excellent website with an intuitive Tree Calculus code playground created by [Johannes Bader](https://johannes-bader.com/) that introduced me to Tree Calculus.
+## Versioning
+
+This really is a repo for experimentation so I'm not doing anything sane with the versioning for now. If I decide to stabilize the project we'll start anew at 2.0.
 
 ## REPL examples
 
@@ -36,15 +36,21 @@ tricu < -- or calculate its size (/demos/size.tri)
 tricu < size not?
 tricu > 12
 
-tricu < -- REPL Commands:
-tricu < !definitions  -- Lists all available definitions
-tricu < !output       -- Change output format (Tree, FSL, AST, etc.)
-tricu < !import       -- Import definitions from a file
-tricu < !exit         -- Exit the REPL
-tricu < !clear        -- ANSI screen clear
-tricu < !save         -- Save all REPL definitions to a file that you can !import
-tricu < !reset        -- Clear all REPL definitions
-tricu < !version      -- Print tricu version
+tricu < !help 
+tricu version 1.1.0
+Available commands:
+    !exit        - Exit the REPL
+    !clear       - Clear the screen
+    !reset       - Reset preferences for selected versions
+    !help        - Show tricu version and available commands
+    !output      - Change output format (tree|fsl|ast|ternary|ascii|decode)
+    !definitions - List all defined terms in the content store
+    !import      - Import definitions from file to the content store
+    !watch       - Watch a file for changes, evaluate terms, and store them
+    !refresh     - Refresh environment from content store (definitions are live)
+    !versions    - Show all versions of a term by name
+    !select      - Select a specific version of a term for subsequent lookups
+    !tag         - Add or update a tag for a term by hash or name
 ```
 
 ## Installation and Use

flake.nix

@@ -9,26 +9,42 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs              = nixpkgs.legacyPackages.${system};
-        packageName       = "tricu";
-        containerPackageName = "${packageName}-container";
-
-        customGHC = pkgs.haskellPackages.ghcWithPackages (hpkgs: with hpkgs; [
-          megaparsec
-        ]);
+        pkgs = nixpkgs.legacyPackages.${system};
+        packageName = "tricu";
 
         haskellPackages = pkgs.haskellPackages;
+        hsLib = pkgs.haskell.lib;
 
-        enableSharedExecutables = false;
-        enableSharedLibraries = false;
+        tricuPackage =
+          haskellPackages.callCabal2nix packageName self {};
 
-        tricu = pkgs.haskell.lib.justStaticExecutables self.packages.${system}.default;
+        tricuTests =
+          hsLib.overrideCabal tricuPackage (old: {
+            doCheck = true;
+
+            configureFlags = (old.configureFlags or []) ++ [
+              "--enable-tests"
+            ];
+
+            checkPhase = ''
+              runHook preCheck
+              ./Setup test tricu-tests --show-details=direct
+              runHook postCheck
+            '';
+          });
+
+        customGHC = haskellPackages.ghcWithPackages (hpkgs: with hpkgs; [
+          megaparsec
+        ]);
       in {
+        packages.${packageName} = tricuPackage;
+        packages.default = tricuPackage;
 
-        packages.${packageName} =
-          haskellPackages.callCabal2nix packageName self rec {};
+        packages.test = tricuTests;
+
+        checks.${packageName} = tricuTests;
+        checks.default = tricuTests;
 
-        packages.default = self.packages.${system}.${packageName};
         defaultPackage = self.packages.${system}.default;
 
         devShells.default = pkgs.mkShell {
@@ -39,9 +55,10 @@
             customGHC
             upx
           ];
-          inputsFrom = builtins.attrValues self.packages.${system};
-        };
-        devShell = self.devShells.${system}.default;
 
+          inputsFrom = [
+            tricuPackage
+          ];
+        };
       });
 }

lib/patterns.tri

@@ -1,5 +1,5 @@
 !import "base.tri" !Local
-!import "list.tri" List
+!import "list.tri" !Local
 
 match_ = y (self value patterns :
   triage
@@ -17,8 +17,8 @@ match_ = y (self value patterns :
     patterns)
 
 match = (value patterns :
-  match_ value (List.map (sublist :
-    pair (List.head sublist) (List.head (List.tail sublist)))
+  match_ value (map (sublist :
+    pair (head sublist) (head (tail sublist)))
     patterns))
 
 otherwise = const (t t)

src/ContentStore.hs

@@ -0,0 +1,254 @@
+module ContentStore where
+
+import Research
+
+import Control.Monad                  (foldM, forM_, void)
+import Data.ByteString                (ByteString)
+import Data.List                      (nub, sort)
+import Data.Maybe                     (catMaybes, fromMaybe)
+import Data.Text                      (Text)
+import Database.SQLite.Simple
+import System.Directory               (createDirectoryIfMissing, getXdgDirectory, XdgDirectory(..))
+import System.FilePath                ((</>), takeDirectory)
+
+import qualified Data.Map             as Map
+import qualified Data.Text            as T
+
+data StoredNode = StoredNode ByteString deriving (Show)
+
+instance FromRow StoredNode where
+  fromRow = StoredNode <$> field
+
+data StoredTerm = StoredTerm
+  { termHash :: Text
+  , termNames :: Text
+  , termMetadata :: Text
+  , termCreatedAt :: Integer
+  , termTags :: Text
+  } deriving (Show)
+
+instance FromRow StoredTerm where
+  fromRow = StoredTerm <$> field <*> field <*> field <*> field <*> field
+
+parseNameList :: Text -> [Text]
+parseNameList = filter (not . T.null) . T.splitOn ","
+
+serializeNameList :: [Text] -> Text
+serializeNameList = T.intercalate "," . nub . sort
+
+initContentStore :: IO Connection
+initContentStore = do
+  dbPath <- getContentStorePath
+  createDirectoryIfMissing True (takeDirectory dbPath)
+  conn <- open dbPath
+  execute_ conn "CREATE TABLE IF NOT EXISTS terms (\
+                \hash TEXT PRIMARY KEY, \
+                \names TEXT, \
+                \metadata TEXT, \
+                \created_at INTEGER DEFAULT (strftime('%s','now')), \
+                \tags TEXT DEFAULT '')"
+  execute_ conn "CREATE INDEX IF NOT EXISTS terms_names_idx ON terms(names)"
+  execute_ conn "CREATE INDEX IF NOT EXISTS terms_tags_idx ON terms(tags)"
+  execute_ conn "CREATE TABLE IF NOT EXISTS merkle_nodes (\
+                \hash TEXT PRIMARY KEY, \
+                \node_data BLOB NOT NULL)"
+  return   conn
+
+getContentStorePath :: IO FilePath
+getContentStorePath = do
+  dataDir <- getXdgDirectory XdgData "tricu"
+  return $ dataDir </> "content-store.db"
+
+
+
+hashTerm :: T -> Text
+hashTerm = nodeHash . buildMerkle
+
+storeTerm :: Connection -> [String] -> T -> IO Text
+storeTerm conn newNamesStrList term = do
+  let termHashText = hashTerm term
+      newNamesTextList = map T.pack newNamesStrList
+      metadataText = T.pack "{}"
+  -- Store all Merkle nodes for this term
+  _ <- storeMerkleNodes conn term
+  existingNamesQuery <- query conn
+    "SELECT names FROM terms WHERE hash = ?"
+    (Only termHashText) :: IO [Only Text]
+
+  case existingNamesQuery of
+    [] -> do
+      let allNamesToStore = serializeNameList newNamesTextList
+      execute conn
+        "INSERT INTO terms (hash, names, metadata, tags) VALUES (?, ?, ?, ?)"
+        (termHashText, allNamesToStore, metadataText, T.pack "")
+    [(Only currentNamesText)] -> do
+      let currentNamesList = parseNameList currentNamesText
+      let combinedNamesList = currentNamesList ++ newNamesTextList
+      let allNamesToStore = serializeNameList combinedNamesList
+      execute conn
+        "UPDATE terms SET names = ?, metadata = ? WHERE hash = ?"
+        (allNamesToStore, metadataText, termHashText)
+    _ -> errorWithoutStackTrace $ "Multiple terms with same hash? " ++ show (length existingNamesQuery)
+
+  return termHashText
+
+-- | Reconstruct a Tree Calculus term from its Merkle root hash.
+--   Recursively loads nodes and rebuilds the T structure.
+loadTree :: Connection -> MerkleHash -> IO (Maybe T)
+loadTree conn h
+  | h == nodeHash NLeaf = return (Just Leaf)  -- NLeaf is implicit, not stored
+  | otherwise = do
+      maybeNode <- getNodeMerkle conn h
+      case maybeNode of
+        Nothing -> return Nothing
+        Just node -> Just <$> buildTree node
+  where
+    buildTree :: Node -> IO T
+    buildTree NLeaf = return Leaf
+    buildTree (NStem childHash) = do
+      child <- fromMaybe (errorWithoutStackTrace "BUG: stored hash not found") <$> loadTree conn childHash
+      return (Stem child)
+    buildTree (NFork lHash rHash) = do
+      left <- fromMaybe (errorWithoutStackTrace "BUG: stored hash not found") <$> loadTree conn lHash
+      right <- fromMaybe (errorWithoutStackTrace "BUG: stored hash not found") <$> loadTree conn rHash
+      return (Fork left right)
+
+-- | Store all nodes of a Merkle DAG by traversing the Term and building/storing nodes.
+--   Returns the hash of the root node.
+storeMerkleNodes :: Connection -> T -> IO MerkleHash
+storeMerkleNodes _ Leaf = return $ nodeHash NLeaf
+storeMerkleNodes conn (Stem t) = do
+  childHash <- storeMerkleNodes conn t
+  let thisNode = NStem childHash
+  putMerkleNode conn thisNode
+  return $ nodeHash thisNode
+storeMerkleNodes conn (Fork l r) = do
+  leftHash <- storeMerkleNodes conn l
+  rightHash <- storeMerkleNodes conn r
+  let thisNode = NFork leftHash rightHash
+  putMerkleNode conn thisNode
+  return $ nodeHash thisNode
+
+
+-- | Insert a Merkle node into the store (idempotent).
+putMerkleNode :: Connection -> Node -> IO ()
+putMerkleNode conn node =
+  execute conn "INSERT OR IGNORE INTO merkle_nodes (hash, node_data) VALUES (?, ?)"
+    (nodeHash node, serializeNode node)
+
+-- | Retrieve a Merkle node by its hash.
+getNodeMerkle :: Connection -> MerkleHash -> IO (Maybe Node)
+getNodeMerkle conn h =
+  queryMaybeOne conn "SELECT node_data FROM merkle_nodes WHERE hash = ?" (Only h) >>= \case
+    Just (StoredNode bs) -> return $ Just (deserializeNode bs)
+    Nothing              -> return Nothing
+
+
+
+hashToTerm :: Connection -> Text -> IO (Maybe StoredTerm)
+hashToTerm conn hashText =
+  queryMaybeOne conn (selectStoredTermFields <> " WHERE hash = ?") (Only hashText)
+
+nameToTerm :: Connection -> Text -> IO (Maybe StoredTerm)
+nameToTerm conn nameText =
+  queryMaybeOne conn
+    (selectStoredTermFields <> " WHERE (names = ? OR names LIKE ? OR names LIKE ? OR names LIKE ?) ORDER BY created_at DESC LIMIT 1")
+    (nameText, nameText <> T.pack ",%", T.pack "%," <> nameText <> T.pack ",%", T.pack "%," <> nameText)
+
+listStoredTerms :: Connection -> IO [StoredTerm]
+listStoredTerms conn =
+  query_ conn (selectStoredTermFields <> " ORDER BY created_at DESC")
+
+storeEnvironment :: Connection -> Env -> IO ()
+storeEnvironment conn env = do
+  let defs = Map.toList $ Map.delete "!result" env
+  let groupedDefs = Map.toList $ Map.fromListWith (++) [(term, [name]) | (name, term) <- defs]
+
+  forM_ groupedDefs $ \(term, namesList) -> case namesList of
+    _:_ -> void $ storeTerm conn namesList term
+    _ -> errorWithoutStackTrace "storeEnvironment: empty names list"
+
+loadTerm :: Connection -> String -> IO (Maybe T)
+loadTerm conn identifier = do
+  result <- getTerm conn (T.pack identifier)
+  case result of
+    Just storedTerm -> loadTree conn (termHash storedTerm)
+    Nothing -> return Nothing
+
+getTerm :: Connection -> Text -> IO (Maybe StoredTerm)
+getTerm conn identifier = do
+  if '#' `elem` (T.unpack identifier)
+    then hashToTerm conn (T.pack $ drop 1 (T.unpack identifier))
+    else nameToTerm conn identifier
+
+loadEnvironment :: Connection -> IO Env
+loadEnvironment conn = do
+  terms <- listStoredTerms conn
+  foldM addTermToEnv Map.empty terms
+  where
+    addTermToEnv env storedTerm = do
+      maybeT <- loadTree conn (termHash storedTerm)
+      case maybeT of
+        Just t -> do
+          let namesList = parseNameList (termNames storedTerm)
+          return $ foldl (\e name -> Map.insert (T.unpack name) t e) env namesList
+        Nothing -> return env
+
+termVersions :: Connection -> String -> IO [(Text, T, Integer)]
+termVersions conn name = do
+  let nameText = T.pack name
+  results <- query conn
+    ("SELECT hash, created_at FROM terms WHERE (names = ? OR names LIKE ? OR names LIKE ? OR names LIKE ?) ORDER BY created_at DESC")
+    (nameText, nameText <> T.pack ",%", T.pack "%," <> nameText <> T.pack ",%", T.pack "%," <> nameText)
+
+  catMaybes <$> mapM (\(hashVal, timestamp) -> do
+    maybeT <- loadTree conn hashVal
+    return $ fmap (\t -> (hashVal, t, timestamp)) maybeT
+    ) results
+
+setTag :: Connection -> Text -> Text -> IO ()
+setTag conn hash tagValue = do
+  exists <- termExists conn hash
+  if exists
+    then do
+      currentTagsQuery <- query conn "SELECT tags FROM terms WHERE hash = ?" (Only hash) :: IO [Only Text]
+      case currentTagsQuery of
+        [Only tagsText] -> do
+          let tagsList = parseNameList tagsText
+              newTagsList = tagValue : tagsList
+              newTags = serializeNameList newTagsList
+          execute conn "UPDATE terms SET tags = ? WHERE hash = ?" (newTags, hash)
+        _ -> putStrLn $ "Term with hash " ++ T.unpack hash ++ " not found (should not happen if exists is true)"
+    else
+      putStrLn $ "Term with hash " ++ T.unpack hash ++ " does not exist"
+
+termExists :: Connection -> Text -> IO Bool
+termExists conn hash = do
+  results <- query conn "SELECT 1 FROM terms WHERE hash = ? LIMIT 1" (Only hash) :: IO [[Int]]
+  return $ not (null results)
+
+termToTags :: Connection -> Text -> IO [Text]
+termToTags conn hash = do
+  tagsQuery <- query conn "SELECT tags FROM terms WHERE hash = ?" (Only hash) :: IO [Only Text]
+  case tagsQuery of
+    [Only tagsText] -> return $ parseNameList tagsText
+    _ -> return []
+
+tagToTerm :: Connection -> Text -> IO [StoredTerm]
+tagToTerm conn tagValue = do
+  let pattern = "%" <> tagValue <> "%"
+  query conn (selectStoredTermFields <> " WHERE tags LIKE ? ORDER BY created_at DESC") (Only pattern)
+
+allTermTags :: Connection -> IO [StoredTerm]
+allTermTags conn = do
+  query_ conn (selectStoredTermFields <> " WHERE tags IS NOT NULL AND tags != '' ORDER BY created_at DESC")
+
+selectStoredTermFields :: Query
+selectStoredTermFields = "SELECT hash, names, metadata, created_at, tags FROM terms"
+
+queryMaybeOne :: (FromRow r, ToRow q) => Connection -> Query -> q -> IO (Maybe r)
+queryMaybeOne conn qry params = do
+  results <- query conn qry params
+  case results of
+    [row] -> return $ Just row
+    _     -> return Nothing

src/Eval.hs

@@ -1,19 +1,23 @@
 module Eval where
 
+import ContentStore
 import Parser
 import Research
 
-import           Data.List   (partition, (\\), elemIndex)
-import           Data.Map    (Map)
-import           Data.Set    (Set)
+import Control.Monad (foldM)
+import Data.List (partition, (\\), elemIndex, foldl')
+import Data.Map  ()
+import Data.Set  (Set)
+import Database.SQLite.Simple
 
-import qualified Data.Foldable as F
+import qualified Data.Foldable as F ()
 import qualified Data.Map as Map
 import qualified Data.Set as Set
+import qualified Data.Text as T
 
 data DB
-  = BVar Int          -- bound (0 = nearest binder)
-  | BFree String      -- free/global
+  = BVar Int
+  | BFree String
   | BLam DB
   | BApp DB DB
   | BLeaf
@@ -32,51 +36,108 @@ evalSingle env term
   | SDef name [] body <- term
   = case Map.lookup name env of
       Just existingValue
-        | existingValue == evalAST env body -> env
-        | otherwise -> errorWithoutStackTrace $
-            "Unable to rebind immutable identifier: " ++ name
-      Nothing ->
-        let res = evalAST env body
-        in Map.insert "!result" res (Map.insert name res env)
+        | existingValue == evalASTSync env body -> env
+        | otherwise
+        -> let res = evalASTSync env body
+           in Map.insert "!result" res (Map.insert name res env)
+      Nothing
+        -> let res = evalASTSync env body
+           in Map.insert "!result" res (Map.insert name res env)
   | SApp func arg <- term
-  = let res = apply (evalAST env func) (evalAST env arg)
-      in Map.insert "!result" res env
-  | SVar name <- term
+  = let res = apply (evalASTSync env func) (evalASTSync env arg)
+    in Map.insert "!result" res env
+  | SVar name Nothing <- term
   = case Map.lookup name env of
-        Just v  -> Map.insert "!result" v env
-        Nothing ->
-          errorWithoutStackTrace $ "Variable `" ++ name ++ "` not defined\n\
-          \This error should never occur here. Please report this as an issue."
+      Just v -> Map.insert "!result" v env
+      Nothing -> errorWithoutStackTrace $ "Variable " ++ name ++ " not defined"
+  | SVar name (Just hash) <- term
+  = errorWithoutStackTrace $ "Hash-specific variable lookup not supported in local evaluation: " ++ name ++ "#" ++ hash
   | otherwise
-  = Map.insert "!result" (evalAST env term) env
+  = let res = evalASTSync env term
+    in Map.insert "!result" res env
 
 evalTricu :: Env -> [TricuAST] -> Env
 evalTricu env x = go env (reorderDefs env x)
   where
-    go env []     = env
-    go env [x]    =
-      let updatedEnv = evalSingle env x
+    go env' []     = env'
+    go env' [def]    =
+      let updatedEnv = evalSingle env' def
       in Map.insert "!result" (result updatedEnv) updatedEnv
-    go env (x:xs) =
-      evalTricu (evalSingle env x) xs
+    go env' (def:xs) =
+      evalTricu (evalSingle env' def) xs
 
-evalAST :: Env -> TricuAST -> T
-evalAST env term
-  | SLambda _ _ <- term = evalAST env (elimLambda term)
-  | SVar   name <- term = evalVar name
-  | TLeaf       <- term = Leaf
-  | TStem  t    <- term = Stem (evalAST env t)
-  | TFork  t u  <- term = Fork (evalAST env t) (evalAST env u)
-  | SApp   t u  <- term = apply (evalAST env t) (evalAST env u)
-  | SStr   s    <- term = ofString s
-  | SInt   n    <- term = ofNumber n
-  | SList  xs   <- term = ofList (map (evalAST env) xs)
-  | SEmpty      <- term = Leaf
-  | otherwise           = errorWithoutStackTrace "Unexpected AST term"
-    where
-      evalVar name = Map.findWithDefault
-        (errorWithoutStackTrace $ "Variable " ++ name ++ " not defined")
-        name env
+evalASTSync :: Env -> TricuAST -> T
+evalASTSync env term = case term of
+  SLambda _ _ -> evalASTSync env (elimLambda term)
+  SVar name Nothing -> case Map.lookup name env of
+    Just v -> v
+    Nothing -> errorWithoutStackTrace $ "Variable " ++ name ++ " not defined"
+  SVar name (Just hash) ->
+    case Map.lookup (name ++ "#" ++ hash) env of
+      Just v -> v
+      Nothing -> errorWithoutStackTrace $
+        "Variable " ++ name ++ " with hash " ++ hash ++ " not found in environment"
+  TLeaf -> Leaf
+  TStem t -> Stem (evalASTSync env t)
+  TFork t u -> Fork (evalASTSync env t) (evalASTSync env u)
+  SApp t u -> apply (evalASTSync env t) (evalASTSync env u)
+  SStr s -> ofString s
+  SInt n -> ofNumber n
+  SList xs -> ofList (map (evalASTSync env) xs)
+  SEmpty -> Leaf
+  _ -> errorWithoutStackTrace $ "Unexpected AST term: " ++ show term
+
+evalAST :: Maybe Connection -> Map.Map String T.Text -> TricuAST -> IO T
+evalAST mconn selectedVersions ast = do
+  let varNames = collectVarNames ast
+  resolvedEnv <- resolveTermsFromStore mconn selectedVersions varNames
+  return $ evalASTSync resolvedEnv ast
+
+collectVarNames :: TricuAST -> [(String, Maybe String)]
+collectVarNames = go []
+  where
+    go acc (SVar name mhash) = (name, mhash) : acc
+    go acc (SApp t u) = go (go acc t) u
+    go acc (SLambda vars body) =
+      let boundVars = Set.fromList vars
+          collected = go [] body
+      in acc ++ filter (\(name, _) -> not $ Set.member name boundVars) collected
+    go acc (TStem t) = go acc t
+    go acc (TFork t u) = go (go acc t) u
+    go acc (SList xs) = foldl' go acc xs
+    go acc _ = acc
+
+resolveTermsFromStore :: Maybe Connection -> Map.Map String T.Text -> [(String, Maybe String)] -> IO Env
+resolveTermsFromStore Nothing _ _ = return Map.empty
+resolveTermsFromStore (Just conn) selectedVersions varNames = do
+  foldM (\env (name, mhash) -> do
+    term <- resolveTermFromStore conn selectedVersions name mhash
+    case term of
+      Just t -> return $ Map.insert (getVarKey name mhash) t env
+      Nothing -> return env
+      ) Map.empty varNames
+  where
+    getVarKey name Nothing = name
+    getVarKey name (Just hash) = name ++ "#" ++ hash
+
+resolveTermFromStore :: Connection -> Map.Map String T.Text -> String -> Maybe String -> IO (Maybe T)
+resolveTermFromStore conn selectedVersions name mhash = case mhash of
+  Just hashPrefix -> do
+    versions <- termVersions conn name
+    let matchingVersions = filter (\(hash, _, _) ->
+          T.isPrefixOf (T.pack hashPrefix) hash) versions
+    case matchingVersions of
+      [] -> return Nothing
+      [(_, term, _)] -> return $ Just term
+      _ -> return Nothing
+  Nothing -> case Map.lookup name selectedVersions of
+    Just hash -> loadTree conn hash
+    Nothing -> do
+      versions <- termVersions conn name
+      case versions of
+        [] -> return Nothing
+        [(_, term, _)] -> return $ Just term
+        _ -> return $ Just (head (map (\(_, t, _) -> t) versions))
 
 elimLambda :: TricuAST -> TricuAST
 elimLambda = go
@@ -88,18 +149,16 @@ elimLambda = go
       | lambdaList term     = go (lambdaListResult term)
       | nestedLambda term   = nestedLambdaResult term
       | application term    = applicationResult term
+      | isSList term        = slistTransform term
       | otherwise           = term
 
-    -- patterns (now DB-indexed where it matters)
-    etaReduction (SLambda [v] (SApp f (SVar x))) = v == x && not (usesBinder v f)
+    etaReduction (SLambda [v] (SApp f (SVar x Nothing))) = v == x && not (usesBinder v f)
     etaReduction _ = False
 
-    -- triage: \a b c -> TLeaf (TLeaf a b) c  (checked in DB with a↦2, b↦1, c↦0)
     triagePattern (SLambda [a] (SLambda [b] (SLambda [c] body))) =
       toDB [c,b,a] body == triageBodyDB
     triagePattern _ = False
 
-    -- compose: \f g x -> f (g x)  (checked in DB with f↦2, g↦1, x↦0)
     composePattern (SLambda [f] (SLambda [g] (SLambda [x] body))) =
       toDB [x,g,f] body == composeBodyDB
     composePattern _ = False
@@ -113,25 +172,34 @@ elimLambda = go
     application (SApp _ _) = True
     application _ = False
 
-    -- rewrites
     etaReduceResult (SLambda [_] (SApp f _)) = f
+    etaReduceResult _ = error "etaReduceResult: expected SLambda [v] (SApp f _)"
 
     lambdaListResult (SLambda [v] (SList xs)) =
       SLambda [v] (foldr wrapTLeaf TLeaf xs)
       where
         wrapTLeaf m r = SApp (SApp TLeaf m) r
+    lambdaListResult _ = error "lambdaListResult: expected SLambda [v] (SList xs)"
 
-    -- The key change: use DB bracket abstraction for the final parameter.
     nestedLambdaResult (SLambda (v:vs) body)
       | null vs   =
           let body' = go body
               db    = toDB [v] body'
-          in toSKIKiselyov db 
+          in toSKIKiselyov db
       | otherwise = go (SLambda [v] (SLambda vs body))
+    nestedLambdaResult _ = error "nestedLambdaResult: expected SLambda (_:_) _"
 
     applicationResult (SApp f g) = SApp (go f) (go g)
+    applicationResult _ = error "applicationResult: expected SApp _ _"
 
--- combinators and special forms (unchanged)
+    isSList (SList _) = True
+    isSList _         = False
+
+    slistTransform :: TricuAST -> TricuAST
+    slistTransform (SList xs) = foldr (\m r -> SApp (SApp TLeaf (go m)) r) TLeaf xs
+    slistTransform ast = ast -- Should not be reached
+
+_S, _K, _I, _R, _C, _B, _T, _TRI :: TricuAST
 _S   = parseSingle "t (t (t t t)) t"
 _K   = parseSingle "t t"
 _I   = parseSingle "t (t (t t)) t"
@@ -141,15 +209,21 @@ _B   = parseSingle "t (t (t t (t (t (t t t)) t))) (t t)"
 _T   = SApp _C _I
 _TRI = parseSingle "t (t (t t (t (t (t t t))))) t"
 
--- pattern bodies (kept for reference; checks are now DB-based)
-triageBody a b c   = SApp (SApp TLeaf (SApp (SApp TLeaf (SVar a)) (SVar b))) (SVar c)
-composeBody f g x  = SApp (SVar f) (SApp (SVar g) (SVar x))
+triageBody  :: String -> String -> String -> TricuAST
+triageBody a b c   = SApp (SApp TLeaf (SApp (SApp TLeaf (SVar a Nothing)) (SVar b Nothing))) (SVar c Nothing)
+composeBody :: String -> String -> String -> TricuAST
+composeBody f g x  = SApp (SVar f Nothing) (SApp (SVar g Nothing) (SVar x Nothing))
 
 isFree :: String -> TricuAST -> Bool
 isFree x t = Set.member x (freeVars t)
 
+-- Keep old freeVars for compatibility with reorderDefs which still uses TricuAST
 freeVars :: TricuAST -> Set String
-freeVars = freeDBNames . toDB []
+freeVars (SVar v Nothing) = Set.singleton v
+freeVars (SVar v (Just _)) = Set.singleton v
+freeVars (SApp t u) = Set.union (freeVars t) (freeVars u)
+freeVars (SLambda vs body) = Set.difference (freeVars body) (Set.fromList vs)
+freeVars _ = Set.empty
 
 reorderDefs :: Env -> [TricuAST] -> [TricuAST]
 reorderDefs env defs
@@ -200,7 +274,7 @@ buildDepGraph topDefs
 sortDeps :: Map.Map String (Set.Set String) -> [String]
 sortDeps graph = go [] Set.empty (Map.keys graph)
   where
-    go sorted sortedSet [] = sorted
+    go sorted _sortedSet [] = sorted
     go sorted sortedSet remaining =
       let ready = [ name | name <- remaining
                         , let deps = Map.findWithDefault Set.empty name graph
@@ -231,10 +305,18 @@ mainResult r = case Map.lookup "main" r of
   Just  a -> a
   Nothing -> errorWithoutStackTrace "No valid definition for `main` found."
 
+findVarNames :: TricuAST -> [String]
+findVarNames ast = case ast of
+  SVar name _ -> [name]
+  SApp a b -> findVarNames a ++ findVarNames b
+  SLambda args body -> findVarNames body \\ args
+  SDef name args body -> name : (findVarNames body \\ args)
+  _ -> []
+
 -- Convert named TricuAST to De Bruijn form
 toDB :: [String] -> TricuAST -> DB
 toDB env = \case
-  SVar v       -> maybe (BFree v) BVar (elemIndex v env)
+  SVar v _     -> maybe (BFree v) BVar (elemIndex v env)
   SLambda vs b ->
     let env' = reverse vs ++ env
         body = toDB env' b
@@ -276,7 +358,7 @@ freeDBNames = \case
   BList xs  -> foldMap freeDBNames xs
   BEmpty    -> mempty
 
--- Helper: “is the binder named v used in body?”
+-- Helper: "is the binder named v used in body?"
 usesBinder :: String -> TricuAST -> Bool
 usesBinder v body = dependsOnLevel 0 (toDB [v] body)
 
@@ -292,7 +374,7 @@ composeBodyDB =
 -- Convert DB -> TricuAST for subterms that contain NO binders (no BLam, no BVar)
 fromDBClosed :: DB -> TricuAST
 fromDBClosed = \case
-  BFree s   -> SVar s
+  BFree s   -> SVar s Nothing
   BApp f a  -> SApp (fromDBClosed f) (fromDBClosed a)
   BLeaf     -> TLeaf
   BStem t   -> TStem (fromDBClosed t)
@@ -317,8 +399,7 @@ toSKIDB (BList xs) =
   in if not anyUses
         then SApp _K (SList (map fromDBClosed xs))
         else SList (map toSKIDB xs)
-toSKIDB other =
-  errorWithoutStackTrace $ "Unhandled toSKI(DB) conversion: " ++ show other
+toSKIDB _other = _K `SApp` TLeaf
 
 app2 :: TricuAST -> TricuAST -> TricuAST
 app2 f x = SApp f x
@@ -336,11 +417,13 @@ kisConv = \case
   BVar n | n > 0 -> do
     (g,d) <- kisConv (BVar (n - 1))
     Right (False:g, d)
+  BVar n     -> Right ([], SVar ("BVar" ++ show n) Nothing)
+  BFree s    -> Right ([], SVar s Nothing)
   BApp e1 e2 -> do
     (g1,d1) <- kisConv e1
     (g2,d2) <- kisConv e2
-    let g = zipWithDefault False (||) g1 g2   -- <— propagate Γ outside (#)
-        d = kisHash (g1,d1) (g2,d2)           -- <— (#) yields only the term
+    let g = zipWithDefault False (||) g1 g2   -- <- propagate Γ outside (#)
+        d = kisHash (g1,d1) (g2,d2)           -- <- (#) yields only the term
     Right (g, d)
   -- Treat closed constants as free 'combinator leaves' (no binder use).
   BLeaf      -> Right ([], TLeaf)
@@ -358,12 +441,11 @@ kisConv = \case
   BFork l r
     | dependsOnLevel 0 l || dependsOnLevel 0 r -> Left "Fork with binder use: fallback"
     | otherwise                                -> Right ([], TFork (fromDBClosed l) (fromDBClosed r))
-  -- We shouldn’t see BLam under elim; treat as unsupported so we fallback.
+  -- We shouldn't see BLam under elim; treat as unsupported so we fallback.
   BLam _      -> Left "Nested lambda under body: fallback"
-  BFree s     -> Right ([], SVar s)
 
 -- Application combiner with K-optimization (lazy weakening).
--- Mirrors Lynn’s 'optK' rules: choose among S, B, C, R based on leading flags.
+-- Mirrors Lynn's 'optK' rules: choose among S, B, C, R based on leading flags.
 -- η-aware (#) with K-optimization (adapted from TS kiselyov_eta)
 kisHash :: (Uses, TricuAST) -> (Uses, TricuAST) -> TricuAST
 kisHash (g1, d1) (g2, d2) =
@@ -381,7 +463,7 @@ kisHash (g1, d1) (g2, d2) =
                          else kisHash ([], SApp _R d2) (gs1, d1)
       _ ->
         if isId2 (g1, d1) && case g2 of { False:_ -> True; _ -> False }
-          then kisHash ([], _T) (tail g2, d2)
+          then kisHash ([], _T) (drop1 g2, d2)
         else
           -- NEW: coalesce the longest run of identical head pairs and apply bulk op once
           let ((h1, h2), count) = headPairRun g1 g2
@@ -404,7 +486,7 @@ kisHash (g1, d1) (g2, d2) =
       []            -> kisHash (gs1, d1) ([], d2)
       _             ->
         if isId2 (g1, d1) && case g2 of { False:_ -> True; _ -> False }
-          then kisHash ([], _T) (tail g2, d2)
+          then kisHash ([], _T) (drop1 g2, d2)
         else case g2 of
           True:gs2   ->
             let d1' = kisHash ([], _B) (gs1, d1)
@@ -412,8 +494,8 @@ kisHash (g1, d1) (g2, d2) =
           False:gs2  ->
             kisHash (gs1, d1) (gs2, d2)
   where
-    tail (_:xs) = xs
-    tail []     = []
+    drop1 (_:xs) = xs
+    drop1 []     = []
 
 
 toSKIKiselyov :: DB -> TricuAST
@@ -484,7 +566,6 @@ bulkS :: Int -> TricuAST
 bulkS n | n <= 1    = _S
         | otherwise = SApp sPrime (bulkS (n - 1))
 
--- Count how many leading pairs (a,b) repeat at the head of zip g1 g2
 headPairRun :: [Bool] -> [Bool] -> ((Bool, Bool), Int)
 headPairRun g1 g2 =
   case zip g1 g2 of

src/FileEval.hs

@@ -5,11 +5,11 @@ import Lexer
 import Parser
 import Research
 
+import Control.Monad   ()
 import Data.List       (partition)
 import Data.Maybe      (mapMaybe)
-import Control.Monad   (foldM)
-import System.IO
 import System.FilePath (takeDirectory, normalise, (</>))
+import System.IO ()
 
 import qualified Data.Map as Map
 import qualified Data.Set as Set
@@ -17,12 +17,12 @@ import qualified Data.Set as Set
 extractMain :: Env -> Either String T
 extractMain env =
   case Map.lookup "main" env of
-    Just result -> Right result
+    Just evalResult -> Right evalResult
     Nothing -> Left "No `main` function detected"
 
 processImports :: Set.Set FilePath -> FilePath -> FilePath -> [TricuAST]
                  -> Either String ([TricuAST], [(FilePath, String, FilePath)])
-processImports seen base currentPath asts =
+processImports seen _base currentPath asts =
   let (imports, nonImports) = partition isImp asts
       importPaths = mapMaybe getImportInfo imports
   in if currentPath `Set.member` seen
@@ -40,11 +40,11 @@ evaluateFileResult filePath = do
   let tokens = lexTricu contents
   case parseProgram tokens of
     Left err -> errorWithoutStackTrace (handleParseError err)
-    Right ast -> do
+    Right _ast -> do
       processedAst <- preprocessFile filePath
       let finalEnv = evalTricu Map.empty processedAst
       case extractMain finalEnv of
-        Right result -> return result
+        Right evalResult -> return evalResult
         Left err -> errorWithoutStackTrace err
 
 evaluateFile :: FilePath -> IO Env
@@ -53,7 +53,7 @@ evaluateFile filePath = do
   let tokens = lexTricu contents
   case parseProgram tokens of
     Left err -> errorWithoutStackTrace (handleParseError err)
-    Right ast -> do
+    Right _ast -> do
       ast <- preprocessFile filePath
       pure $ evalTricu Map.empty ast
 
@@ -63,7 +63,7 @@ evaluateFileWithContext env filePath = do
   let tokens = lexTricu contents
   case parseProgram tokens of
     Left err -> errorWithoutStackTrace (handleParseError err)
-    Right ast -> do
+    Right _ast -> do
       ast <- preprocessFile filePath
       pure $ evalTricu env ast
 
@@ -84,8 +84,8 @@ preprocessFile' seen base currentPath = do
           imported <- concat <$> mapM (processImportPath seen' base) importPaths
           pure $ imported ++ nonImports
   where
-    processImportPath seen base (path, name, importPath) = do
-      ast <- preprocessFile' seen base importPath
+    processImportPath _seen _base (_path, name, importPath) = do
+      ast <- preprocessFile' _seen _base importPath
       pure $ map (nsDefinition (if name == "!Local" then "" else name))
            $ filter (not . isImp) ast
     isImp (SImport _ _) = True
@@ -109,9 +109,9 @@ nsDefinition moduleName other =
   nsBody moduleName other
 
 nsBody :: String -> TricuAST -> TricuAST
-nsBody moduleName (SVar name)
-  | isPrefixed name = SVar name
-  | otherwise = SVar (nsVariable moduleName name)
+nsBody moduleName (SVar name mhash)
+  | isPrefixed name = SVar name mhash
+  | otherwise = SVar (nsVariable moduleName name) mhash
 nsBody moduleName (SApp func arg) =
   SApp (nsBody moduleName func) (nsBody moduleName arg)
 nsBody moduleName (SLambda args body) =
@@ -122,18 +122,16 @@ nsBody moduleName (TFork left right) =
   TFork (nsBody moduleName left) (nsBody moduleName right)
 nsBody moduleName (TStem subtree) =
   TStem (nsBody moduleName subtree)
-nsBody moduleName (SDef name args body)
-  | isPrefixed name = SDef name args (nsBody moduleName body)
-  | otherwise = SDef (nsVariable moduleName name)
-                        args (nsBody moduleName body)
+nsBody moduleName (SDef name args body) =
+  SDef (nsVariable moduleName name) args (nsBodyScoped moduleName args body)
 nsBody _ other = other
 
 nsBodyScoped :: String -> [String] -> TricuAST -> TricuAST
 nsBodyScoped moduleName args body = case body of
-  SVar name ->
+  SVar name mhash ->
     if name `elem` args
-      then SVar name
-      else nsBody moduleName (SVar name)
+      then SVar name mhash
+      else nsBody moduleName (SVar name mhash)
   SApp func arg ->
     SApp (nsBodyScoped moduleName args func) (nsBodyScoped moduleName args arg)
   SLambda innerArgs innerBody ->
@@ -141,13 +139,11 @@ nsBodyScoped moduleName args body = case body of
   SList items ->
     SList (map (nsBodyScoped moduleName args) items)
   TFork left right ->
-    TFork (nsBodyScoped moduleName args left)
-          (nsBodyScoped moduleName args right)
+    TFork (nsBodyScoped moduleName args left) (nsBodyScoped moduleName args right)
   TStem subtree ->
     TStem (nsBodyScoped moduleName args subtree)
   SDef name innerArgs innerBody ->
-    SDef (nsVariable moduleName name) innerArgs
-         (nsBodyScoped moduleName (args ++ innerArgs) innerBody)
+    SDef (nsVariable moduleName name) innerArgs (nsBodyScoped moduleName (args ++ innerArgs) innerBody)
   other -> other
 
 isPrefixed :: String -> Bool

src/Lexer.hs

@@ -4,13 +4,12 @@ import Research
 
 import Control.Monad               (void)
 import Data.Functor                (($>))
+import Data.Set ()
 import Data.Void
 import Text.Megaparsec
 import Text.Megaparsec.Char hiding (space)
 import Text.Megaparsec.Char.Lexer
 
-import qualified Data.Set as Set
-
 type Lexer = Parsec Void String
 
 tricuLexer :: Lexer [LToken]
@@ -23,18 +22,19 @@ tricuLexer = do
       ]
     sc
     pure tok
-  tokens <- many $ do
+  toks <- many $ do
     tok <- choice tricuLexer'
     sc
     pure tok
   sc
   eof
-  pure (header ++ tokens)
+  pure (header ++ toks)
   where
     tricuLexer' =
       [ try lnewline
       , try namespace
       , try dot
+      , try identifierWithHash
       , try identifier
       , try keywordT
       , try integerLiteral
@@ -50,18 +50,39 @@ tricuLexer = do
 lexTricu :: String -> [LToken]
 lexTricu input = case runParser tricuLexer "" input of
   Left err -> errorWithoutStackTrace $ "Lexical error:\n" ++ errorBundlePretty err
-  Right tokens -> tokens
+  Right toks -> toks
 
 
 keywordT :: Lexer LToken
 keywordT = string "t" *> notFollowedBy alphaNumChar $> LKeywordT
 
+identifierWithHash :: Lexer LToken
+identifierWithHash = do
+  first <- lowerChar <|> char '_'
+  rest  <- many $ letterChar
+              <|> digitChar <|> char '_' <|> char '-' <|> char '?'
+              <|> char '$'  <|> char '@' <|> char '%'
+  _ <- char '#' -- Consume '#'
+  hashString <- some (alphaNumChar <|> char '-') -- Ensures at least one char for hash
+                <?> "hash characters (alphanumeric or hyphen)"
+
+  let name = first : rest
+  let hashLen = length hashString
+  if name == "t" || name == "!result"
+    then fail "Keywords (`t`, `!result`) cannot be used with a hash suffix."
+    else if hashLen < 16 then
+      fail $ "Hash suffix for '" ++ name ++ "' must be at least 16 characters long. Got " ++ show hashLen ++ " ('" ++ hashString ++ "')."
+    else if hashLen > 64 then -- Assuming SHA256, max 64
+      fail $ "Hash suffix for '" ++ name ++ "' cannot be longer than 64 characters (SHA256). Got " ++ show hashLen ++ " ('" ++ hashString ++ "')."
+    else
+      return (LIdentifierWithHash name hashString)
+
 identifier :: Lexer LToken
 identifier = do
   first <- lowerChar <|> char '_'
   rest  <- many $ letterChar
               <|> digitChar <|> char '_' <|> char '-' <|> char '?'
-              <|> char '$'  <|> char '#' <|> char '@' <|> char '%'
+              <|> char '$'  <|> char '@' <|> char '%'
   let name = first : rest
   if name == "t" || name == "!result"
     then fail "Keywords (`t`, `!result`) cannot be used as an identifier"
@@ -121,8 +142,8 @@ integerLiteral = do
 
 stringLiteral :: Lexer LToken
 stringLiteral = do
-  char '"'
-  content <- manyTill Lexer.charLiteral (char '"')
+  void (char '"')
+  content <- manyTill Lexer.charLiteral (void (char '"'))
   return (LStringLiteral content)
 
 charLiteral :: Lexer Char
@@ -141,3 +162,4 @@ charLiteral = escapedChar <|> normalChar
         '\\' -> '\\'
         '"'  -> '"'
         '\'' -> '\''
+        _    -> c

src/Main.hs

@@ -1,5 +1,6 @@
 module Main where
 
+import ContentStore ()
 import Eval                   (evalTricu, mainResult, result)
 import FileEval
 import Parser                 (parseTricu)
@@ -7,11 +8,11 @@ import REPL
 import Research
 
 import Control.Monad          (foldM)
-import Control.Monad.IO.Class (liftIO)
+import Control.Monad.IO.Class ()
 import Data.Version           (showVersion)
-import Text.Megaparsec        (runParser)
 import Paths_tricu            (version)
 import System.Console.CmdArgs
+import Text.Megaparsec        ()
 
 import qualified Data.Map as Map
 
@@ -55,25 +56,24 @@ decodeMode = TDecode
 main :: IO ()
 main = do
   let versionStr = "tricu Evaluator and REPL " ++ showVersion version
-  args <- cmdArgs $ modes [replMode, evaluateMode, decodeMode]
+  cmdArgsParsed <- cmdArgs $ modes [replMode, evaluateMode, decodeMode]
     &= help "tricu: Exploring Tree Calculus"
     &= program "tricu"
     &= summary versionStr
     &= versionArg [explicit, name "version", summary versionStr]
-  case args of
+  case cmdArgsParsed of
     Repl -> do
       putStrLn "Welcome to the tricu REPL"
       putStrLn "You may exit with `CTRL+D` or the `!exit` command."
-      putStrLn "Try typing `!` with tab completion for more commands."
-      repl Map.empty
-    Evaluate { file = filePaths, form = form } -> do
-      result <- case filePaths of
+      repl
+    Evaluate { file = filePaths, form = outputForm } -> do
+      evalResult <- case filePaths of
         [] -> runTricuT <$> getContents
         (filePath:restFilePaths) -> do
             initialEnv <- evaluateFile filePath
             finalEnv <- foldM evaluateFileWithContext initialEnv restFilePaths
             pure $ mainResult finalEnv
-      let fRes = formatT form result
+      let fRes = formatT outputForm evalResult
       putStr fRes
     TDecode { file = filePaths } -> do
       value <- case filePaths of
@@ -81,8 +81,6 @@ main = do
         (filePath:_) -> readFile filePath
       putStrLn $ decodeResult $ result $ evalTricu Map.empty $ parseTricu value
 
--- Simple interfaces
-
 runTricu :: String -> String
 runTricu = formatT TreeCalculus . runTricuT
 
@@ -125,4 +123,4 @@ runTricuEnvWithEnv env input =
   let asts     = parseTricu input
       finalEnv = evalTricu env asts
       res      = result finalEnv
-   in (finalEnv, formatT TreeCalculus res)
+   in (finalEnv, formatT TreeCalculus res)

src/Parser.hs

@@ -8,7 +8,7 @@ import Control.Monad.State
 import Data.List.NonEmpty        (toList)
 import Data.Void                 (Void)
 import Text.Megaparsec
-import Text.Megaparsec.Error     (ParseErrorBundle, errorBundlePretty)
+
 import qualified Data.Set as Set
 
 data PState = PState
@@ -20,9 +20,9 @@ type ParserM = StateT PState (Parsec Void [LToken])
 
 satisfyM :: (LToken -> Bool) -> ParserM LToken
 satisfyM f = do
-  token <- lift (satisfy f)
-  modify' (updateDepth token)
-  return token
+  tok <- lift (satisfy f)
+  modify' (updateDepth tok)
+  return tok
 
 updateDepth :: LToken -> PState -> PState
 updateDepth LOpenParen    st = st { parenDepth   = parenDepth st   + 1 }
@@ -39,12 +39,12 @@ topLevelNewline = do
     else fail "Top-level exit in nested context (paren or bracket)"
 
 parseProgram :: [LToken] -> Either (ParseErrorBundle [LToken] Void) [TricuAST]
-parseProgram tokens =
-  runParser (evalStateT (parseProgramM <* finalizeDepth <* eof) (PState 0 0)) "" tokens
+parseProgram toks =
+  runParser (evalStateT (parseProgramM <* finalizeDepth <* eof) (PState 0 0)) "" toks
 
 parseSingleExpr :: [LToken] -> Either (ParseErrorBundle [LToken] Void) TricuAST
-parseSingleExpr tokens =
-  runParser (evalStateT (scnParserM *> parseExpressionM <* finalizeDepth <* eof) (PState 0 0)) "" tokens
+parseSingleExpr toks =
+  runParser (evalStateT (scnParserM *> parseExpressionM <* finalizeDepth <* eof) (PState 0 0)) "" toks
 
 finalizeDepth :: ParserM ()
 finalizeDepth = do
@@ -195,6 +195,7 @@ parseTreeTermM = do
       | TLeaf     <- acc = TStem next
       | TStem t   <- acc = TFork t next
       | TFork _ _ <- acc = TFork acc next
+      | otherwise        = SApp acc next
 
 parseTreeLeafOrParenthesizedM :: ParserM TricuAST
 parseTreeLeafOrParenthesizedM = choice
@@ -248,42 +249,51 @@ parseGroupedItemM = do
 
 parseSingleItemM :: ParserM TricuAST
 parseSingleItemM = do
-  token <- satisfyM (\case LIdentifier _ -> True; LKeywordT -> True; _ -> False)
-  if | LIdentifier name <- token -> pure (SVar name)
-     | token == LKeywordT        -> pure TLeaf
+  tok <- satisfyM (\case LIdentifier _ -> True; LKeywordT -> True; _ -> False)
+  if | LIdentifier name <- tok -> pure (SVar name Nothing)
+     | tok == LKeywordT        -> pure TLeaf
      | otherwise                 -> fail "Unexpected token in list item"
 
 parseVarM :: ParserM TricuAST
 parseVarM = do
-  token <- satisfyM (\case
+  tok <- satisfyM (\case
     LNamespace _ -> True
     LIdentifier _ -> True
+    LIdentifierWithHash _ _ -> True
     _ -> False)
-  case token of
+
+  case tok of
     LNamespace ns -> do
       _ <- satisfyM (== LDot)
       LIdentifier name <- satisfyM (\case LIdentifier _ -> True; _ -> False)
-      pure $ SVar (ns ++ "." ++ name)
+      pure $ SVar (ns ++ "." ++ name) Nothing
+
     LIdentifier name
       | name == "t" || name == "!result" ->
         fail ("Reserved keyword: " ++ name ++ " cannot be assigned.")
-      | otherwise -> pure (SVar name)
+      | otherwise -> pure (SVar name Nothing)
+
+    LIdentifierWithHash name hash ->
+      if name == "t" || name == "!result"
+        then fail ("Reserved keyword: " ++ name ++ " cannot be assigned.")
+        else pure (SVar name (Just hash))
+
     _ -> fail "Unexpected token while parsing variable"
 
 parseIntLiteralM :: ParserM TricuAST
 parseIntLiteralM = do
   let intL = (\case LIntegerLiteral _ -> True; _ -> False)
-  token <- satisfyM intL
-  if | LIntegerLiteral value <- token ->
-       pure (SInt value)
+  tok <- satisfyM intL
+  if | LIntegerLiteral value <- tok ->
+       pure (SInt (fromIntegral value))
      | otherwise                      ->
        fail "Unexpected token while parsing integer literal"
 
 parseStrLiteralM :: ParserM TricuAST
 parseStrLiteralM = do
   let strL = (\case LStringLiteral _ -> True; _ -> False)
-  token <- satisfyM strL
-  if | LStringLiteral value <- token ->
+  tok <- satisfyM strL
+  if | LStringLiteral value <- tok ->
        pure (SStr value)
      | otherwise                     ->
        fail "Unexpected token while parsing string literal"
@@ -299,8 +309,8 @@ handleParseError bundle =
   in unlines ("Parse error(s) encountered:" : formattedErrors)
 
 formatError :: ParseError [LToken] Void -> String
-formatError (TrivialError offset unexpected expected) =
-  let unexpectedMsg = case unexpected of
+formatError (TrivialError offset msgUnexpected expected) =
+  let unexpectedMsg = case msgUnexpected of
         Just x  -> "unexpected token " ++ show x
         Nothing -> "unexpected end of input"
       expectedMsg = if null expected

src/REPL.hs

@@ -1,30 +1,54 @@
 module REPL where
 
+import ContentStore
 import Eval
 import FileEval
-import Lexer
+import Lexer ()
 import Parser
 import Research
 
-import Control.Exception         (IOException, SomeException, catch
-                                 , displayException)
-import Control.Monad             (forM_)
-import Control.Monad.Catch       (handle, MonadCatch)
+import Control.Concurrent (forkIO, threadDelay, killThread, ThreadId)
+import Control.Exception         (SomeException, catch, displayException)
+import Control.Monad ()
+import Control.Monad (forever, when, forM_, foldM, unless)
+import Control.Monad.Catch       (handle)
 import Control.Monad.IO.Class    (liftIO)
-import Control.Monad.Trans.Class (lift)
+import Control.Monad.Trans.Class ()
 import Control.Monad.Trans.Maybe (MaybeT(..), runMaybeT)
-import Data.Char                 (isSpace, isUpper)
-import Data.List                 (dropWhile, dropWhileEnd, isPrefixOf)
+import Data.ByteString ()
+import Data.Char                 (isSpace)
+import Data.IORef (newIORef, readIORef, writeIORef)
+import Data.List                 (dropWhileEnd, isPrefixOf, find)
+import Data.Maybe (isJust, fromJust)
+import Data.Time (getCurrentTime, diffUTCTime)
+import Data.Time.Clock.POSIX (posixSecondsToUTCTime)
+import Data.Time.Format (formatTime, defaultTimeLocale)
 import Data.Version (showVersion)
+import Database.SQLite.Simple (Connection, Only(..), query)
 import Paths_tricu (version)
+import System.Console.ANSI (setSGR, SGR(..), ConsoleLayer(..), ColorIntensity(..), Color(..))
 import System.Console.Haskeline
+import System.Directory (doesFileExist, createDirectoryIfMissing)
+import System.FSNotify
+import System.FilePath (takeDirectory, (</>))
+import Text.Read (readMaybe)
 
 import qualified Data.Map as Map
 import qualified Data.Text as T
-import qualified Data.Text.IO as T
+import qualified Data.Text.IO as T ()
 
-repl :: Env -> IO ()
-repl env = runInputT settings (withInterrupt (loop env Decode))
+data REPLState = REPLState
+  { replForm :: EvaluatedForm
+  , replContentStore :: Maybe Connection
+  , replWatchedFile :: Maybe FilePath
+  , replSelectedVersions :: Map.Map String T.Text
+  , replWatcherThread :: Maybe ThreadId
+  }
+
+repl :: IO ()
+repl = do
+  conn <- ContentStore.initContentStore 
+  runInputT settings (withInterrupt (loop (REPLState Decode (Just conn) Nothing Map.empty Nothing)))
   where
     settings :: Settings IO
     settings = Settings
@@ -39,152 +63,529 @@ repl env = runInputT settings (withInterrupt (loop env Decode))
       where
         commands = [ "!exit"
                    , "!output"
-                   , "!definitions"
                    , "!import"
                    , "!clear"
-                   , "!save"
                    , "!reset"
-                   , "!version"
+                   , "!help"
+                   , "!definitions"
+                   , "!watch"
+                   , "!refresh"
+                   , "!versions"
+                   , "!select"
+                   , "!tag"
                    ]
 
-    loop :: Env -> EvaluatedForm -> InputT IO ()
-    loop env form = handle (interruptHandler env form) $ do
+    loop :: REPLState -> InputT IO ()
+    loop state = handle (\Interrupt -> interruptHandler state Interrupt) $ do
       minput <- getInputLine "tricu < "
       case minput of
-        Nothing -> outputStrLn "Exiting tricu"
+        Nothing -> return ()
         Just s
-          | strip s == "" -> loop env form
+          | strip s == "" -> loop state
           | strip s == "!exit" -> outputStrLn "Exiting tricu"
           | strip s == "!clear" -> do
               liftIO $ putStr "\ESC[2J\ESC[H"
-              loop env form
+              loop state
           | strip s == "!reset" -> do
-              outputStrLn "Environment reset to initial state"
-              loop Map.empty form
-          | strip s == "!version" -> do
+              outputStrLn "Selected versions reset"
+              loop state { replSelectedVersions = Map.empty }
+          | strip s == "!help" -> do
               outputStrLn $ "tricu version " ++ showVersion version
-              loop env form
-          | "!save" `isPrefixOf` strip s -> handleSave env form
-          | strip s == "!output" -> handleOutput env form
-          | strip s == "!definitions" -> do
-              let defs = Map.keys $ Map.delete "!result" env
-              if null defs
-                then outputStrLn "No definitions discovered."
-                else do
-                  outputStrLn "Available definitions:"
-                  mapM_ outputStrLn defs
-              loop env form
-          | "!import" `isPrefixOf` strip s -> handleImport env form
-          | take 2 s == "--" -> loop env form
+              outputStrLn "Available commands:"
+              outputStrLn "  !exit        - Exit the REPL"
+              outputStrLn "  !clear       - Clear the screen"
+              outputStrLn "  !reset       - Reset preferences for selected versions"
+              outputStrLn "  !help        - Show tricu version and available commands"
+              outputStrLn "  !output      - Change output format (tree|fsl|ast|ternary|ascii|decode)"
+              outputStrLn "  !definitions - List all defined terms in the content store"
+              outputStrLn "  !import      - Import definitions from file to the content store"
+              outputStrLn "  !watch       - Watch a file for changes, evaluate terms, and store them"
+              outputStrLn "  !versions    - Show all versions of a term by name"
+              outputStrLn "  !select      - Select a specific version of a term for subsequent lookups"
+              outputStrLn "  !tag         - Add or update a tag for a term by hash or name"
+              loop state
+          | strip s == "!output" -> handleOutput state
+          | strip s == "!definitions" -> handleDefinitions state
+          | "!import" `isPrefixOf` strip s -> handleImport state
+          | "!watch" `isPrefixOf` strip s -> handleWatch state
+          | strip s == "!refresh" -> handleRefresh state
+          | "!versions" `isPrefixOf` strip s -> handleVersions state
+          | "!select" `isPrefixOf` strip s -> handleSelect state
+          | "!tag" `isPrefixOf` strip s -> handleTag state
+          | take 2 s == "--" -> loop state
           | otherwise -> do
-              newEnv <- liftIO $ processInput env s form `catch` errorHandler env
-              loop newEnv form
+              evalResult <- liftIO $ catch
+                (processInput state s)
+                (errorHandler state)
+              loop evalResult
 
-    handleOutput :: Env -> EvaluatedForm -> InputT IO ()
-    handleOutput env currentForm = do
+    handleOutput :: REPLState -> InputT IO ()
+    handleOutput state = do
       let formats = [Decode, TreeCalculus, FSL, AST, Ternary, Ascii]
       outputStrLn "Available output formats:"
-      mapM_ (\(i, f) -> outputStrLn $ show i ++ ". " ++ show f)
+      mapM_ (\(i, f) -> outputStrLn $ show (i :: Int) ++ ". " ++ show f)
         (zip [1..] formats)
 
-      result <- runMaybeT $ do
+      evalResult <- runMaybeT $ do
         input <- MaybeT $ getInputLine "Select output format (1-6) < "
         case reads input of
           [(n, "")] | n >= 1 && n <= 6 ->
             return $ formats !! (n-1)
           _ -> MaybeT $ return Nothing
 
-      case result of
+      case evalResult of
         Nothing -> do
           outputStrLn "Invalid selection. Keeping current output format."
-          loop env currentForm
+          loop state
         Just newForm -> do
           outputStrLn $ "Output format changed to: " ++ show newForm
-          loop env newForm
+          loop state { replForm = newForm }
 
-    handleImport :: Env -> EvaluatedForm -> InputT IO ()
-    handleImport env form = do
-      res <- runMaybeT $ do
-        let fset = setComplete completeFilename defaultSettings
-        path <- MaybeT $ runInputT fset $
-          getInputLineWithInitial "File path to load < " ("", "")
+    handleDefinitions :: REPLState -> InputT IO ()
+    handleDefinitions state = case replContentStore state of
+      Nothing -> do
+        liftIO $ printError "Content store not initialized"
+        loop state
+      Just conn -> do
+        terms <- liftIO $ ContentStore.listStoredTerms conn
+        
+        if null terms
+          then do
+            liftIO $ printWarning "No terms in content store."
+            loop state
+          else do
+            liftIO $ do
+              printSuccess $ "Content store contains " ++ show (length terms) ++ " terms:"
 
-        text <- MaybeT $ liftIO $ handle (\e -> do
-            putStrLn $ "Error reading file: " ++ displayException (e :: IOException)
-            return Nothing
-          ) $ Just <$> readFile (strip path)
+            let maxNameWidth = maximum $ map (length . T.unpack . termNames) terms
 
-        case parseProgram (lexTricu text) of
-          Left err -> do
-            lift $ outputStrLn $ "Parse error: " ++ handleParseError err
-            MaybeT $ return Nothing
-          Right ast -> do
-            ns <- MaybeT $ runInputT defaultSettings $
-              getInputLineWithInitial "Namespace (or !Local for no namespace) < " ("", "")
+            forM_ terms $ \term -> do
+              let namesStr = T.unpack (termNames term)
+                  hash = termHash term
+                  padding = replicate (maxNameWidth - length namesStr) ' '
+                  
+              liftIO $ do
+                putStr "  "
+                printVariable namesStr
+                putStr padding
+                putStr " [hash: "
+                displayColoredHash hash
+                putStrLn "]"
+                
+                tags <- ContentStore.termToTags conn hash 
+                unless (null tags) $ displayTags tags
 
-            let name = strip ns
-            if (name /= "!Local" && (null name || not (isUpper (head name)))) then do
-                lift $ outputStrLn "Namespace must start with an uppercase letter"
-                MaybeT $ return Nothing
-            else do
-                prog <- liftIO $ preprocessFile (strip path)
-                let code = case name of
-                      "!Local" -> prog
-                      _ -> nsDefinitions name prog
-                    env' = evalTricu env code
-                return env'
-      case res of
+            loop state
+
+    handleImport :: REPLState -> InputT IO ()
+    handleImport state = do
+      let fset = setComplete completeFilename defaultSettings
+      filename <- runInputT fset $ getInputLineWithInitial "File to import: " ("", "")
+      case filename of
+        Nothing -> loop state
+        Just f -> do
+          let cleanFilename = strip f
+          exists <- liftIO $ doesFileExist cleanFilename
+          if not exists
+            then do
+              liftIO $ printError $ "File not found: " ++ cleanFilename
+              loop state
+            else importFile state cleanFilename
+
+    importFile :: REPLState -> String -> InputT IO ()
+    importFile state cleanFilename = do
+      _code <- liftIO $ readFile cleanFilename
+      case replContentStore state of
         Nothing -> do
-          outputStrLn "Import cancelled"
-          loop env form
-        Just env' ->
-          loop (Map.delete "!result" env') form
+          liftIO $ printError "Content store not initialized"
+          loop state
+        Just conn -> do
+          env <- liftIO $ evaluateFile cleanFilename
+          
+          liftIO $ do
+            printSuccess $ "Importing file: " ++ cleanFilename
+            let defs = Map.toList $ Map.delete "!result" env
+            
+            importedCount <- foldM (\count (name, term) -> do
+              hash <- ContentStore.storeTerm conn [name] term
+              printSuccess $ "Stored definition: " ++ name ++ " with hash " ++ T.unpack hash
+              return (count + (1 :: Int))
+              ) 0 defs
+            
+            printSuccess $ "Imported " ++ show importedCount ++ " definitions successfully"
+          
+          loop state
 
-    interruptHandler :: Env -> EvaluatedForm -> Interrupt -> InputT IO ()
-    interruptHandler env form _ = do
-      outputStrLn "Interrupted with CTRL+C\n\
-                  \You can use the !exit command or CTRL+D to exit"
-      loop env form
+    handleWatch :: REPLState -> InputT IO ()
+    handleWatch state = do
+      dbPath <- liftIO ContentStore.getContentStorePath
+      let filepath = takeDirectory dbPath </> "scratch.tri"
+      let dirPath = takeDirectory filepath
 
-    processInput :: Env -> String -> EvaluatedForm -> IO Env
-    processInput env input form = do
-      let asts   = parseTricu input
-          newEnv = evalTricu env asts
-      case Map.lookup "!result" newEnv of
-        Just r -> do
-          putStrLn $ "tricu > " ++ formatT form r
-        Nothing -> pure ()
-      return newEnv
+      liftIO $ createDirectoryIfMissing True dirPath
 
-    errorHandler :: Env -> SomeException -> IO (Env)
-    errorHandler env e = do
-      putStrLn $ "Error: " ++ show e
-      return env
+      fileExists <- liftIO $ doesFileExist filepath
+      unless fileExists $ liftIO $ writeFile filepath "-- tricu scratch file\n\n"
+
+      outputStrLn $ "Using scratch file: " ++ filepath
+
+      when (isJust (replWatcherThread state)) $ do
+        outputStrLn "Stopping previous file watch"
+        liftIO $ killThread (fromJust $ replWatcherThread state)
+
+      outputStrLn $ "Starting to watch file: " ++ filepath
+      outputStrLn "Press Ctrl+C to stop watching and return to REPL"
+
+      liftIO $ processWatchedFile filepath (replContentStore state) (replSelectedVersions state) (replForm state)
+
+      lastProcessedRef <- liftIO $ newIORef =<< getCurrentTime
+
+      watcherId <- liftIO $ forkIO $ withManager $ \mgr -> do
+        _stopAction <- watchDir mgr dirPath (\ev -> eventPath ev == filepath) $ \_ -> do
+          now <- getCurrentTime
+          lastProcessed <- readIORef lastProcessedRef
+          when (diffUTCTime now lastProcessed > 0.5) $ do
+            putStrLn $ "\nFile changed: " ++ filepath
+            processWatchedFile filepath (replContentStore state) (replSelectedVersions state) (replForm state)
+            writeIORef lastProcessedRef now
+        forever $ threadDelay 1000000
+
+      watchLoop state { replWatchedFile = Just filepath, replWatcherThread = Just watcherId }
+
+    _handleUnwatch :: REPLState -> InputT IO ()
+    _handleUnwatch state = case replWatchedFile state of
+      Nothing -> do
+        outputStrLn "No file is currently being watched"
+        loop state
+      Just path -> do
+        outputStrLn $ "Stopped watching " ++ path
+        when (isJust (replWatcherThread state)) $ do
+          liftIO $ killThread (fromJust $ replWatcherThread state)
+        loop state { replWatchedFile = Nothing, replWatcherThread = Nothing }
+
+    handleRefresh :: REPLState -> InputT IO ()
+    handleRefresh state = case replContentStore state of
+      Nothing -> do
+        outputStrLn "Content store not initialized"
+        loop state
+      Just _conn -> do
+        outputStrLn "Environment refreshed from content store (definitions are live)"
+        loop state
+
+    handleVersions :: REPLState -> InputT IO ()
+    handleVersions state = case replContentStore state of
+      Nothing -> do
+        liftIO $ printError "Content store not initialized"
+        loop state
+      Just conn -> do
+        liftIO $ printPrompt "Term name: "
+        nameInput <- getInputLine ""
+        case nameInput of
+          Nothing -> loop state
+          Just n -> do
+            let termName = strip n
+            versions <- liftIO $ ContentStore.termVersions conn termName
+            if null versions
+              then liftIO $ printError $ "No versions found for term: " ++ termName
+              else do
+                liftIO $ do
+                  printKeyword "Versions of "
+                  printVariable termName
+                  putStrLn ":"
+                  
+                  forM_ (zip [1..] versions) $ \(i, (hash, _, ts)) -> do
+                    tags <- ContentStore.termToTags conn hash
+                    putStr $ show (i :: Int) ++ ". "
+                    displayColoredHash hash
+                    putStr $ " (" ++ formatTimestamp ts ++ ")"
+                    unless (null tags) $ do
+                      putStr " ["
+                      printKeyword "Tags: "
+                      forM_ (zip [0..] tags) $ \(j, tag) -> do
+                        printTag (T.unpack tag)
+                        when (j < length tags - 1) $ putStr ", "
+                      putStr "]"
+                    putStrLn ""
+        loop state
+
+    handleSelect :: REPLState -> InputT IO ()
+    handleSelect state = case replContentStore state of
+      Nothing -> do
+        liftIO $ printError "Content store not initialized"
+        loop state
+      Just conn -> do
+        liftIO $ printPrompt "Term name: "
+        nameInput <- getInputLine ""
+        case nameInput of
+          Nothing -> loop state
+          Just n -> do
+            let cleanName = strip n
+            versions <- liftIO $ ContentStore.termVersions conn cleanName
+            if null versions
+              then do
+                liftIO $ printError $ "No versions found for term: " ++ cleanName
+                loop state
+              else do
+                liftIO $ do
+                  printKeyword "Versions of "
+                  printVariable cleanName
+                  putStrLn ":"
+                  
+                  forM_ (zip [1..] versions) $ \(i, (hash, _, ts)) -> do
+                    tags <- ContentStore.termToTags conn hash
+                    putStr $ show (i :: Int) ++ ". "
+                    displayColoredHash hash
+                    putStr $ " (" ++ formatTimestamp ts ++ ")"
+                    unless (null tags) $ do
+                      putStr " ["
+                      printKeyword "Tags: "
+                      forM_ (zip [0..] tags) $ \(j, tag) -> do
+                        printTag (T.unpack tag)
+                        when (j < length tags - 1) $ putStr ", "
+                      putStr "]"
+                    putStrLn ""
+
+                liftIO $ printPrompt "Select version (number or full hash, Enter to cancel): "
+                choiceInput <- getInputLine ""
+                let choice = strip <$> choiceInput
+
+                selectedHash <- case choice of
+                    Just selectedStr | not (null selectedStr) -> do
+                        case readMaybe selectedStr :: Maybe Int of
+                            Just idx | idx > 0 && idx <= length versions -> do
+                                let (h, _, _) = versions !! (idx - 1)
+                                return $ Just h
+                            _ -> do
+                                let potentialHash = T.pack selectedStr
+                                let foundByHash = find (\(h, _, _) -> T.isPrefixOf potentialHash h) versions
+                                case foundByHash of
+                                    Just (h, _, _) -> return $ Just h
+                                    Nothing -> do
+                                        liftIO $ printError "Invalid selection or hash not found in list."
+                                        return Nothing
+                    _ -> return Nothing
+
+                case selectedHash of
+                    Just hashToSelect -> do
+                        let newState = state { replSelectedVersions =
+                                              Map.insert cleanName hashToSelect (replSelectedVersions state) }
+                        liftIO $ do
+                          printSuccess "Selected version "
+                          displayColoredHash hashToSelect
+                          putStr " for term "
+                          printVariable cleanName
+                          putStrLn ""
+                        loop newState
+                    Nothing -> loop state
+
+    handleTag :: REPLState -> InputT IO ()
+    handleTag state = case replContentStore state of
+      Nothing -> do
+        liftIO $ printError "Content store not initialized"
+        loop state
+      Just conn -> do
+        liftIO $ printPrompt "Term hash (full or prefix) or name (most recent version will be used): "
+        identInput <- getInputLine ""
+        case identInput of
+          Nothing -> loop state
+          Just ident -> do
+            let cleanIdent = strip ident
+            
+            mFullHash <- liftIO $ resolveIdentifierToHash conn cleanIdent
+
+            case mFullHash of
+              Nothing -> do
+                liftIO $ printError $ "Could not resolve identifier: " ++ cleanIdent
+                loop state
+              Just fullHash -> do
+                liftIO $ do
+                    putStr "Tagging term with hash: "
+                    displayColoredHash fullHash
+                    putStrLn ""
+                tags <- liftIO $ ContentStore.termToTags conn fullHash
+                unless (null tags) $ do
+                  liftIO $ do
+                    printKeyword "Existing tags:"
+                    displayTags tags
+
+                liftIO $ printPrompt "Tag to add/set: "
+                tagValueInput <- getInputLine ""
+                case tagValueInput of
+                  Nothing -> loop state
+                  Just tv -> do
+                    let tagVal = T.pack (strip tv)
+                    liftIO $ do
+                      ContentStore.setTag conn fullHash tagVal 
+                      printSuccess $ "Tag '"
+                      printTag (T.unpack tagVal)
+                      putStr "' set for term with hash "
+                      displayColoredHash fullHash
+                      putStrLn ""
+                    loop state
+
+    resolveIdentifierToHash :: Connection -> String -> IO (Maybe T.Text)
+    resolveIdentifierToHash conn ident
+        | T.pack "#" `T.isInfixOf` T.pack ident = do
+            let hashPrefix = T.pack ident
+            matchingHashes <- liftIO $ query conn "SELECT hash FROM terms WHERE hash LIKE ?" (Only (hashPrefix <> "%")) :: IO [Only T.Text]
+            case matchingHashes of
+                [Only fullHash] -> return $ Just fullHash
+                [] -> do printError $ "No hash found starting with: " ++ T.unpack hashPrefix; return Nothing
+                _  -> do printError $ "Ambiguous hash prefix: " ++ T.unpack hashPrefix; return Nothing
+        | otherwise = do
+            versions <- ContentStore.termVersions conn ident
+            if null versions
+            then do printError $ "No versions found for term name: " ++ ident; return Nothing
+            else return $ Just $ (\(h,_,_) -> h) $ head versions
+
+    interruptHandler :: REPLState -> Interrupt -> InputT IO ()
+    interruptHandler state _ = do
+      liftIO $ do
+        printWarning "Interrupted with CTRL+C"
+        printWarning "You can use the !exit command or CTRL+D to exit"
+      loop state
+
+    errorHandler :: REPLState -> SomeException -> IO REPLState
+    errorHandler state e = do
+      printError $ "Error: " ++ displayException e
+      return state
+
+    processInput :: REPLState -> String -> IO REPLState
+    processInput state input = do
+      let asts = parseTricu input
+      case asts of
+        [] -> return state
+        _ -> case replContentStore state of
+          Nothing -> do
+            printError "Content store not initialized"
+            return state
+          Just conn -> do
+            newState <- foldM (\s astNode -> do
+              let varsInAst = Eval.findVarNames astNode
+              foldM (\currentSelectionState varName ->
+                if Map.member varName (replSelectedVersions currentSelectionState)
+                  then return currentSelectionState
+                  else do
+                    versions <- ContentStore.termVersions conn varName
+                    if length versions > 1
+                      then do
+                        let (latestHash, _, _) = head versions
+                        liftIO $ printWarning $ "Multiple versions of '" ++ varName ++ "' found. Using most recent."
+                        return currentSelectionState { replSelectedVersions = Map.insert varName latestHash (replSelectedVersions currentSelectionState) }
+                      else return currentSelectionState
+                ) s varsInAst
+              ) state asts
+
+            forM_ asts $ \ast -> do
+              case ast of
+                SDef name [] body -> do
+                  evalResult <- evalAST (Just conn) (replSelectedVersions newState) body
+                  hash <- ContentStore.storeTerm conn [name] evalResult
+                  
+                  liftIO $ do
+                    putStr "tricu > "
+                    printSuccess "Stored definition: "
+                    printVariable name
+                    putStr " with hash "
+                    displayColoredHash hash
+                    putStrLn ""
+                    
+                    putStr "tricu > "
+                    printResult $ formatT (replForm newState) evalResult
+                    putStrLn ""
+
+                _ -> do
+                  evalResult <- evalAST (Just conn) (replSelectedVersions newState) ast
+                  liftIO $ do
+                    putStr "tricu > "
+                    printResult $ formatT (replForm newState) evalResult
+                    putStrLn ""
+            return newState
 
     strip :: String -> String
     strip = dropWhileEnd isSpace . dropWhile isSpace
 
-    handleSave :: Env -> EvaluatedForm -> InputT IO ()
-    handleSave env form = do
-      let fset = setComplete completeFilename defaultSettings
-      path <- runInputT fset $
-        getInputLineWithInitial "File to save < " ("", "")
+    watchLoop :: REPLState -> InputT IO ()
+    watchLoop state = handle (\Interrupt -> do
+                                outputStrLn "\nStopped watching file"
+                                when (isJust (replWatcherThread state)) $ do
+                                  liftIO $ killThread (fromJust $ replWatcherThread state)
+                                loop state { replWatchedFile = Nothing, replWatcherThread = Nothing }) $ do
+      liftIO $ threadDelay 1000000
+      watchLoop state
 
-      case path of
-        Nothing -> do
-          outputStrLn "Save cancelled"
-          loop env form
-        Just p -> do
-          let definitions = Map.toList $ Map.delete "!result" env
-              filepath = strip p
+    processWatchedFile :: FilePath -> Maybe Connection -> Map.Map String T.Text -> EvaluatedForm -> IO ()
+    processWatchedFile filepath mconn selectedVersions outputForm = do
+      content <- readFile filepath
+      let asts = parseTricu content
 
-          outputStrLn "Starting save..."
-          liftIO $ writeFile filepath ""
-          outputStrLn "File created..."
-          forM_ definitions $ \(name, value) -> do
-            let content = name ++ " = " ++ formatT TreeCalculus value ++ "\n"
-            outputStrLn $ "Writing definition: " ++ name ++ " with length " ++ show (length content)
-            liftIO $ appendFile filepath content
-          outputStrLn $ "Saved " ++ show (length definitions) ++ " definitions to " ++ p
+      case mconn of
+        Nothing -> putStrLn "Content store not initialized for watched file processing."
+        Just conn -> do
+          forM_ asts $ \ast -> case ast of
+            SDef name [] body -> do
+              evalResult <- evalAST (Just conn) selectedVersions body
+              hash <- ContentStore.storeTerm conn [name] evalResult
+              putStrLn $ "tricu > Stored definition: " ++ name ++ " with hash " ++ T.unpack hash
+              putStrLn $ "tricu > " ++ name ++ " = " ++ formatT outputForm evalResult
+            _ -> do
+              evalResult <- evalAST (Just conn) selectedVersions ast
+              putStrLn $ "tricu > Result: " ++ formatT outputForm evalResult
+          putStrLn $ "tricu > Processed file: " ++ filepath
 
-          loop env form
+    formatTimestamp :: Integer -> String
+    formatTimestamp ts = formatTime defaultTimeLocale "%Y-%m-%d %H:%M:%S" (posixSecondsToUTCTime (fromIntegral ts))
+
+    displayColoredHash :: T.Text -> IO ()
+    displayColoredHash hash = do
+      let (prefix, rest) = T.splitAt 16 hash
+      setSGR [SetColor Foreground Vivid Cyan]
+      putStr $ T.unpack prefix
+      setSGR [SetColor Foreground Dull White]
+      putStr $ T.unpack rest
+      setSGR [Reset]
+
+    withColor :: ColorIntensity -> Color -> IO () -> IO ()
+    withColor intensity color action = do
+      setSGR [SetColor Foreground intensity color]
+      action
+      setSGR [Reset]
+
+    printColored :: ColorIntensity -> Color -> String -> IO ()
+    printColored intensity color text = withColor intensity color $ putStr text
+
+    printlnColored :: ColorIntensity -> Color -> String -> IO ()
+    printlnColored intensity color text = withColor intensity color $ putStrLn text
+
+    printSuccess :: String -> IO ()
+    printSuccess = printlnColored Vivid Green
+
+    printError :: String -> IO ()
+    printError = printlnColored Vivid Red
+
+    printWarning :: String -> IO ()
+    printWarning = printlnColored Vivid Yellow
+
+    printPrompt :: String -> IO ()
+    printPrompt = printColored Vivid Blue
+
+    printVariable :: String -> IO ()
+    printVariable = printColored Vivid Magenta
+
+    printTag :: String -> IO ()
+    printTag = printColored Vivid Yellow
+
+    printKeyword :: String -> IO ()
+    printKeyword = printColored Vivid Blue
+
+    printResult :: String -> IO ()
+    printResult = printColored Dull White
+
+    displayTags :: [T.Text] -> IO ()
+    displayTags [] = return ()
+    displayTags tags = do
+      putStr "    Tags: "
+      forM_ (zip [0..] tags) $ \(i, tag) -> do
+        printTag (T.unpack tag)
+        when (i < length tags - 1) $ putStr ", "
+      putStrLn ""

src/Research.hs

@@ -1,12 +1,17 @@
 module Research where
 
+import Crypto.Hash               (hash, SHA256, Digest)
+import Data.ByteArray            (convert)
+import Data.ByteString.Base16    (decode, encode)
 import Data.List                 (intercalate)
-import Data.Map                  (Map)
+import Data.Map                  ()
 import Data.Text                 (Text, replace)
+import Data.Text.Encoding        (decodeUtf8, encodeUtf8)
 import System.Console.CmdArgs    (Data, Typeable)
 
+import qualified Data.ByteString as BS
 import qualified Data.Map        as Map
-import qualified Data.Text as T
+import qualified Data.Text       as T
 
 -- Tree Calculus Types
 data T = Leaf | Stem T | Fork T T
@@ -14,7 +19,7 @@ data T = Leaf | Stem T | Fork T T
 
 -- Abstract Syntax Tree for tricu
 data TricuAST
-  = SVar String
+  = SVar String (Maybe String)
   | SInt Integer
   | SStr String
   | SList [TricuAST]
@@ -30,11 +35,11 @@ data TricuAST
 
 -- Lexer Tokens
 data LToken
-  = LKeywordT
-  | LIdentifier String
+  = LIdentifier String
+  | LIdentifierWithHash String String
+  | LKeywordT
   | LNamespace String
-  | LIntegerLiteral Integer
-  | LStringLiteral String
+  | LImport String String
   | LAssign
   | LColon
   | LDot
@@ -42,9 +47,10 @@ data LToken
   | LCloseParen
   | LOpenBracket
   | LCloseBracket
+  | LStringLiteral String
+  | LIntegerLiteral Int
   | LNewline
-  | LImport String String
-  deriving (Show, Eq, Ord)
+  deriving (Eq, Show, Ord)
 
 -- Output formats
 data EvaluatedForm = TreeCalculus | FSL | AST | Ternary | Ascii | Decode
@@ -53,8 +59,68 @@ data EvaluatedForm = TreeCalculus | FSL | AST | Ternary | Ascii | Decode
 -- Environment containing previously evaluated TC terms
 type Env = Map.Map String T
 
+-- Merkle DAG Node types
+-- Each Tree Calculus node becomes a content-addressed object.
+
+type MerkleHash = Text
+
+data Node
+  = NLeaf
+  | NStem MerkleHash
+  | NFork MerkleHash MerkleHash
+  deriving (Show, Eq, Ord)
+
+-- | Canonical serialization of a Node for hashing.
+--   Leaf:  0x00
+--   Stem:  0x01 || child_hash (32 bytes)
+--   Fork:  0x02 || left_hash (32 bytes) || right_hash (32 bytes)
+serializeNode :: Node -> BS.ByteString
+serializeNode NLeaf        = BS.pack [0x00]
+serializeNode (NStem h) = BS.pack [0x01] <> go (decode (encodeUtf8 h))
+  where go (Left _) = error "Research.serializeNode: invalid hex hash"
+        go (Right bs) = bs
+serializeNode (NFork l r) = BS.pack [0x02] <> go (decode (encodeUtf8 l)) <> go (decode (encodeUtf8 r))
+  where go (Left _) = error "Research.serializeNode: invalid hex hash"
+        go (Right bs) = bs
+
+-- | Hash a node per the Merkle content-addressing spec.
+-- hash = SHA256( "tricu.merkle.node.v1" <> 0x00 <> node_payload )
+nodeHash :: Node -> MerkleHash
+nodeHash node = decodeUtf8 (encode (sha256WithPrefix (serializeNode node)))
+  where sha256WithPrefix payload =
+          convert . (hash :: BS.ByteString -> Digest SHA256) $ utf8Tag <> BS.pack [0x00] <> payload
+        utf8Tag = BS.pack $ map fromIntegral $ BS.unpack "tricu.merkle.node.v1"
+
+-- | Deserialize a Node from canonical bytes.
+deserializeNode :: BS.ByteString -> Node
+deserializeNode bs =
+  case BS.uncons bs of
+    Just (0x00, rest)
+      | BS.null rest -> NLeaf
+
+    Just (0x01, rest)
+      | BS.length rest == 32 ->
+          NStem $ decodeUtf8 (encode rest)
+
+    Just (0x02, rest)
+      | BS.length rest == 64 ->
+          let (l, r) = BS.splitAt 32 rest
+          in NFork (decodeUtf8 (encode l)) (decodeUtf8 (encode r))
+
+    _ -> errorWithoutStackTrace "invalid merkle node payload"
+
+-- | Build a Merkle DAG from a Tree Calculus term.
+buildMerkle :: T -> Node
+buildMerkle Leaf = NLeaf
+buildMerkle (Stem t) = NStem (nodeHash child)
+  where child = buildMerkle t
+buildMerkle (Fork l r) = NFork (nodeHash left) (nodeHash right)
+  where
+    left  = buildMerkle l
+    right = buildMerkle r
+
 -- Tree Calculus Reduction Rules
-{- 
+{-
   The t operator is left associative.
   1.  t  t      a b       -> a
   2.  t (t a)   b c       -> a c (b c)
@@ -65,9 +131,9 @@ type Env = Map.Map String T
 apply :: T -> T -> T
 apply (Fork Leaf a)         _         = a
 apply (Fork (Stem a) b) c             = apply (apply a c) (apply b c)
-apply (Fork (Fork a  b) c)  Leaf      = a
-apply (Fork (Fork a  b) c) (Stem u)   = apply b u
-apply (Fork (Fork a  b) c) (Fork u v) = apply (apply c u) v
+apply (Fork (Fork _a _b) _c)  Leaf      = _a
+apply (Fork (Fork _a _b) _c) (Stem u)   = apply _b u
+apply (Fork (Fork _a _b) _c) (Fork u v) = apply (apply _c u) v
 -- Left associative `t`
 apply  Leaf b                         = Stem b
 apply (Stem a) b                      = Fork a b
@@ -109,7 +175,7 @@ toNumber _ = Left "Invalid Tree Calculus number"
 toString :: T -> Either String String
 toString tc = case toList tc of
   Right list -> traverse (fmap (toEnum . fromInteger) . toNumber) list
-  Left err -> Left "Invalid Tree Calculus string"
+  Left _ -> Left "Invalid Tree Calculus string"
 
 toList :: T -> Either String [T]
 toList Leaf = Right []

test/Spec.hs

@@ -12,7 +12,6 @@ import Control.Monad.IO.Class (liftIO)
 import Data.List              (isInfixOf)
 import Test.Tasty
 import Test.Tasty.HUnit
-import Test.Tasty.QuickCheck
 import Text.Megaparsec        (runParser)
 
 import qualified Data.Map as Map
@@ -35,8 +34,8 @@ tests = testGroup "Tricu Tests"
   , modules
   , demos
   , decoding
-	, elimLambdaSingle
-	, stressElimLambda
+  , elimLambdaSingle
+  , stressElimLambda
   ]
 
 lexer :: TestTree
@@ -105,7 +104,7 @@ parser = testGroup "Parser Tests"
 
   , testCase "Parse function definitions" $ do
       let input = "x = (a b c : a)"
-          expect = SDef "x" [] (SLambda ["a"] (SLambda ["b"] (SLambda ["c"] (SVar "a"))))
+          expect = SDef "x" [] (SLambda ["a"] (SLambda ["b"] (SLambda ["c"] (SVar "a" Nothing))))
       parseSingle input @?= expect
 
   , testCase "Parse nested Tree Calculus terms" $ do
@@ -125,7 +124,7 @@ parser = testGroup "Parser Tests"
 
   , testCase "Parse function with applications" $ do
       let input  = "f = (x : t x)"
-          expect = SDef "f" [] (SLambda ["x"] (SApp TLeaf (SVar "x")))
+          expect = SDef "f" [] (SLambda ["x"] (SApp TLeaf (SVar "x" Nothing)))
       parseSingle input @?= expect
 
   , testCase "Parse nested lists" $ do
@@ -172,17 +171,17 @@ parser = testGroup "Parser Tests"
 
   , testCase "Parse lambda abstractions" $ do
       let input  = "(a : a)"
-          expect = (SLambda ["a"] (SVar "a"))
+          expect = (SLambda ["a"] (SVar "a" Nothing))
       parseSingle input @?= expect
 
   , testCase "Parse multiple arguments to lambda abstractions" $ do
       let input  = "x = (a b : a)"
-          expect = SDef "x" [] (SLambda ["a"] (SLambda ["b"] (SVar "a")))
+          expect = SDef "x" [] (SLambda ["a"] (SLambda ["b"] (SVar "a" Nothing)))
       parseSingle input @?= expect
 
   , testCase "Grouping T terms with parentheses in function application" $ do
       let input  = "x = (a : a)\nx (t)"
-          expect = [SDef "x" [] (SLambda ["a"] (SVar "a")),SApp (SVar "x") TLeaf]
+          expect = [SDef "x" [] (SLambda ["a"] (SVar "a" Nothing)),SApp (SVar "x" Nothing) TLeaf]
       parseTricu input @?= expect
 
   , testCase "Comments 1" $ do

tricu.cabal

@@ -1,8 +1,8 @@
 cabal-version: 1.12
 
 name:           tricu
-version:        0.19.0
-description:    A micro-language for exploring Tree Calculus
+version:        1.1.0
+description:    A language for exploring Tree Calculus
 author:         James Eversole
 maintainer:     james@eversole.co
 copyright:      James Eversole
@@ -15,29 +15,59 @@ extra-source-files:
 executable tricu
   main-is: Main.hs
   hs-source-dirs:
-      src
+    src
   default-extensions:
-      DeriveDataTypeable
-      LambdaCase
-      MultiWayIf
-      OverloadedStrings
-  ghc-options: -threaded -rtsopts -with-rtsopts=-N -optl-pthread -fPIC
+    DeriveDataTypeable
+    LambdaCase
+    MultiWayIf
+    OverloadedStrings
+    ScopedTypeVariables
+  ghc-options: 
+    -Wall
+    -Wcompat
+    -Wunused-imports
+    -Wunused-top-binds
+    -Wunused-local-binds
+    -Wunused-matches
+    -Wredundant-constraints
+    -threaded 
+    -rtsopts 
+    -with-rtsopts=-N 
+    -optl-pthread 
+    -fPIC
   build-depends:
     base >=4.7
+    , aeson
+    , ansi-terminal
+    , base16-bytestring
+    , base64-bytestring
+    , bytestring
+    , cereal
     , cmdargs
     , containers
+    , cryptonite
+    , directory
     , exceptions
     , filepath
+    , fsnotify
     , haskeline
     , megaparsec
+    , memory
     , mtl
+    , sqlite-simple
+    , tasty
+    , tasty-hunit
     , text
+    , time
     , transformers
+    , zlib
   other-modules:
+    ContentStore
     Eval
     FileEval
     Lexer
     Parser
+    Paths_tricu
     REPL
     Research
   default-language: Haskell2010
@@ -51,25 +81,40 @@ test-suite tricu-tests
       LambdaCase
       MultiWayIf
       OverloadedStrings
+      ScopedTypeVariables
   build-depends:       
-    base
+    base >=4.7
+    , aeson
+    , ansi-terminal
+    , base16-bytestring
+    , base64-bytestring
+    , bytestring
+    , cereal
     , cmdargs
     , containers
+    , cryptonite
+    , directory
     , exceptions
     , filepath
+    , fsnotify
     , haskeline
     , megaparsec
+    , memory
     , mtl
+    , sqlite-simple
     , tasty
     , tasty-hunit
-    , tasty-quickcheck
     , text
+    , time
     , transformers
+    , zlib
   default-language:    Haskell2010
   other-modules:
+    ContentStore
     Eval
     FileEval
     Lexer
     Parser
+    Paths_tricu
     REPL
     Research