Merge content store

README.md

@@ -10,14 +10,14 @@ tricu is the word for "tree" in Lojban: `(x1) is a tree of species/cultivar (x2)
 
 ## Features
 
-- Tree Calculus operator: `t`
-- Immutable definitions: `x = t t`
-- Lambda abstraction: `id = (a : a)`
-- List, Number, and String literals: `[(2) ("Hello")]` 
-- Function application: `not (not false)`
-- Higher order/first-class functions: `map (a : append a "!") [("Hello")]`
-- Intensionality blurs the distinction between functions and data (see REPL examples)
-- Simple module system for code organization
+- Tree Calculus **operator**: `t`
+- **Immutable definitions**: `x = t t`
+- **Lambda abstraction**: `id = (a : a)`
+- **List, Number, and String** literals: `[(2) ("Hello")]` 
+- **Function application**: `not (not false)`
+- **Higher order/first-class functions**: `map (a : append a "!") [("Hello")]`
+- **Intensionality** blurs the distinction between functions and data (see REPL examples)
+- **Content-addressed store**: save, version, tag, and recall your tricu terms.
 
 ## REPL examples
 
@@ -52,6 +52,16 @@ tricu < !reset        -- Clear all REPL definitions
 tricu < !version      -- Print tricu version
 ```
 
+## Content Store
+
+tricu uses a "content store" SQLite database that saves and versions your definitions persistently.
+
+*   **Persistent definitions:** Any term you define in the REPL is automatically saved.
+*   **Content-addressed:** Terms are stored based on a SHA256 hash of their content. This means identical terms are stored only once, even if they have different names.
+*   **Versioning and history:** If you redefine a name, the Content Store keeps a record of previous definitions associated with that name. You can explore the history of a term and access older versions.
+*   **Tagging:** You can assign tags to versions of your terms to organize and quickly switch between related function versions.
+*   **Querying:** The store allows you to search for terms by name, hash, or tags.
+
 ## Installation and Use
 
 You can easily build and run this project using [Nix](https://nixos.org/download/).