docs: add repository context files
Add new context files to assist with repository navigation and design consistency: - context/repo-map.md: A roadmap for the repository. - context/design-principles.md: Guidelines for maintaining repository consistency. Update CLAUDE.md to include instructions on using the new context files. Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)
This commit is contained in:
Edward Langley
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context/repo-map.md
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# Repository Map (LLM Reference)
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Terminal pivot-table modeling app. Rust, Ratatui TUI, command/effect architecture.
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Crate `improvise` v0.1.0, MIT, edition 2021.
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---
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## How to Find Things
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| I need to... | Look in |
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|---------------------------------------|----------------------------------------------|
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| Add a new keybinding | `command/keymap.rs` → `default_keymaps()` |
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| Add a new user-facing command | `command/cmd.rs` → implement `Cmd`, register in `default_registry()` |
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| Add a new state mutation | `ui/effect.rs` → implement `Effect` |
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| Change formula evaluation | `model/types.rs` → `eval_formula()`, `eval_expr()` |
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| Change how cells are stored/queried | `model/cell.rs` → `DataStore` |
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| Change category/item behavior | `model/category.rs` → `Category` |
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| Change view axis logic | `view/types.rs` → `View` |
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| Change grid layout computation | `view/layout.rs` → `GridLayout` |
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| Change .improv file format | `persistence/mod.rs` → `format_md()`, `parse_md()` |
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| Change number display formatting | `format.rs` → `format_f64()` |
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| Change CLI arguments | `main.rs` → clap structs |
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| Change import wizard logic | `import/wizard.rs` → `ImportPipeline` |
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| Change grid rendering | `ui/grid.rs` → `GridWidget` |
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| Change TUI frame layout | `draw.rs` → `draw()` |
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| Change app state / mode transitions | `ui/app.rs` → `App`, `AppMode` |
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| Write a test for model logic | `model/types.rs` → `mod tests` / `mod formula_tests` |
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| Write a test for a command | `command/cmd.rs` → `mod tests` |
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---
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## Core Types and Traits
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### Command/Effect Pipeline (the central architecture pattern)
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```
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User keypress → Keymap lookup → Cmd::execute(&CmdContext) → Vec<Box<dyn Effect>> → Effect::apply(&mut App)
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(immutable) (pure, read-only) (state mutations)
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```
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```rust
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// src/command/cmd.rs
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pub trait Cmd: Debug + Send + Sync {
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fn name(&self) -> &'static str;
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fn execute(&self, ctx: &CmdContext) -> Vec<Box<dyn Effect>>;
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}
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pub struct CmdContext<'a> {
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pub model: &'a Model, // immutable
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pub layout: &'a GridLayout, // immutable
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pub registry: &'a CmdRegistry,
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pub mode: &'a AppMode,
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pub selected: (usize, usize), // (row, col) cursor
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pub row_offset: usize,
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pub col_offset: usize,
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pub search_query: &'a str,
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pub search_mode: bool,
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pub yanked: &'a Option<CellValue>,
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pub key_code: KeyCode, // the key that triggered this command
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pub buffers: &'a HashMap<String, String>,
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pub expanded_cats: &'a HashSet<String>,
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// panel cursors, tile cursor, visible dimensions...
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}
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// src/ui/effect.rs
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pub trait Effect: Debug {
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fn apply(&self, app: &mut App);
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fn changes_mode(&self) -> bool { false } // override if effect changes AppMode
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}
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```
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**To add a command**: implement `Cmd`, then in `default_registry()` call `r.register(...)` or use the `effect_cmd!` macro for simple cases. Bind it in `default_keymaps()`.
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**To add an effect**: implement `Effect` in `effect.rs`, add a constructor function.
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### Data Model
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```rust
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// src/model/types.rs
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pub struct Model {
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pub name: String,
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pub categories: IndexMap<String, Category>, // ordered
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pub data: DataStore,
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pub formulas: Vec<Formula>,
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pub views: IndexMap<String, View>,
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pub active_view: String,
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pub measure_agg: HashMap<String, AggFunc>, // per-measure aggregation override
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}
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// Key methods:
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// add_category(&mut self, name) -> Result<CategoryId> [max 12 regular]
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// category(&self, name) -> Option<&Category>
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// category_mut(&mut self, name) -> Option<&mut Category>
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// set_cell(&mut self, key: CellKey, value: CellValue)
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// evaluate(&self, key: &CellKey) -> Option<CellValue> [formulas + raw data]
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// evaluate_aggregated(&self, key, none_cats) -> Option<CellValue> [sums over hidden dims]
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// add_formula(&mut self, formula: Formula) [replaces same target+category]
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// remove_formula(&mut self, target, category)
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// category_names(&self) -> impl Iterator<Item = &str>
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const MAX_CATEGORIES: usize = 12; // virtual categories don't count
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```
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```rust
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// src/model/cell.rs
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#[derive(Clone, PartialEq, Eq, Hash)]
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pub struct CellKey(pub Vec<(String, String)>); // always sorted by category name
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// CellKey::new(coords) — sorts on construction, enforcing canonical form
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// CellKey::with(cat, item) -> Self — returns new key with coord added/replaced
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// CellKey::without(cat) -> Self — returns new key with coord removed
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// CellKey::get(cat) -> Option<&str>
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#[derive(Clone, PartialEq)]
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pub enum CellValue {
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Number(f64),
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Text(String),
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}
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// CellValue::as_f64() -> Option<f64>
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pub struct DataStore {
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cells: HashMap<InternedKey, CellValue>,
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pub symbols: SymbolTable,
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index: HashMap<(Symbol, Symbol), HashSet<InternedKey>>, // secondary index
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}
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// DataStore::set(&mut self, key: &CellKey, value: CellValue)
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// DataStore::get(&self, key: &CellKey) -> Option<&CellValue>
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// DataStore::matching_values(&self, partial: &[(String,String)]) -> Vec<CellValue>
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// DataStore::matching_cells(&self, partial) -> Vec<(CellKey, CellValue)>
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```
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```rust
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// src/model/category.rs
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pub struct Category {
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pub id: CategoryId, // usize
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pub name: String,
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pub kind: CategoryKind,
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pub items: IndexMap<String, Item>, // ordered
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pub groups: IndexMap<String, Group>,
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next_item_id: ItemId, // private, auto-increment
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}
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// Category::add_item(&mut self, name) -> ItemId [deduplicates by name]
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// Category::ordered_item_names(&self) -> Vec<&str> [respects group order]
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pub enum CategoryKind { Regular, VirtualIndex, VirtualDim, Label }
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```
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### Formula System
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```rust
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// src/formula/ast.rs
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pub enum Expr {
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Number(f64),
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Ref(String), // reference to an item name
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BinOp(BinOp, Box<Expr>, Box<Expr>),
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UnaryMinus(Box<Expr>),
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Agg(AggFunc, Box<Expr>, Option<Filter>),
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If(Box<Expr>, Box<Expr>, Box<Expr>),
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}
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pub enum BinOp { Add, Sub, Mul, Div, Pow, Eq, Ne, Lt, Gt, Le, Ge }
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pub enum AggFunc { Sum, Avg, Min, Max, Count }
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pub struct Formula {
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pub raw: String, // "Profit = Revenue - Cost"
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pub target: String, // "Profit"
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pub target_category: String, // "Measure"
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pub expr: Expr,
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pub filter: Option<Filter>, // WHERE clause
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}
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// src/formula/parser.rs
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pub fn parse_formula(raw: &str, target_category: &str) -> Result<Formula>
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```
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Formula evaluation is in `model/types.rs` → `eval_formula()` / `eval_expr()`. Operates at full f64 precision. Display rounding in `format.rs` is view-only.
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### View and Layout
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```rust
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// src/view/axis.rs
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pub enum Axis { Row, Column, Page, None }
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// src/view/types.rs
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pub struct View {
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pub name: String,
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pub category_axes: IndexMap<String, Axis>,
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pub page_selections: HashMap<String, String>,
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pub hidden_items: HashMap<String, HashSet<String>>,
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pub collapsed_groups: HashMap<String, HashSet<String>>,
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pub number_format: String, // e.g. ",.0" or ",.2f"
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pub prune_empty: bool,
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// scroll/selection state...
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}
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// View::set_axis(&mut self, cat, axis)
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// View::axis_of(&self, cat) -> Axis
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// View::cycle_axis(&mut self, cat) [Row→Column→Page→None→Row]
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// View::transpose(&mut self) [swap Row↔Column]
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// View::categories_on(&self, axis) -> Vec<&str>
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// View::on_category_added(&mut self, cat) [auto-assigns axis]
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// src/view/layout.rs
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pub struct GridLayout { /* computed from Model + View */ }
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// GridLayout::new(model, view) -> Self
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// GridLayout::cell_key(row, col) -> Option<CellKey>
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// GridLayout::cell_value(row, col) -> Option<CellValue>
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// GridLayout::row_label(row) -> &str
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// GridLayout::col_label(col) -> &str
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// GridLayout::drill_records(row, col) -> Vec<(CellKey, CellValue)>
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// Records mode: auto-detected when _Index on Row + _Dim on Column
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```
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### App State
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```rust
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// src/ui/app.rs
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pub enum AppMode {
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Normal,
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Editing { minibuf: MinibufferConfig },
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FormulaEdit { minibuf: MinibufferConfig },
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FormulaPanel,
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CategoryPanel,
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ViewPanel,
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TileSelect,
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CategoryAdd { minibuf: MinibufferConfig },
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ItemAdd { minibuf: MinibufferConfig },
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ExportPrompt { minibuf: MinibufferConfig },
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CommandMode { minibuf: MinibufferConfig },
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ImportWizard,
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Help,
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Quit,
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}
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// Note: SearchMode is Normal + search_mode:bool flag, not a separate variant.
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pub struct App {
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pub model: Model,
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pub mode: AppMode,
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pub file_path: Option<PathBuf>,
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pub dirty: bool,
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pub help_page: usize,
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pub transient_keymap: Option<Arc<Keymap>>, // for prefix keys
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// layout cache, drill_state, wizard, buffers, panel cursors, etc.
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}
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// App::handle_key(&mut self, KeyEvent) -> Result<()> [main input dispatch]
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// App::rebuild_layout(&mut self)
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// App::is_empty_model(&self) -> bool [true when only virtual categories exist]
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```
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### Keymap System
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```rust
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// src/command/keymap.rs
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pub enum KeyPattern { Key(KeyCode, KeyModifiers), AnyChar, Any }
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pub enum Binding {
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Cmd { name: &'static str, args: Vec<String> },
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Prefix(Arc<Keymap>), // Emacs-style sub-keymap
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Sequence(Vec<(&'static str, Vec<String>)>), // multi-command chain
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}
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pub enum ModeKey {
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Normal, Help, FormulaPanel, CategoryPanel, ViewPanel, TileSelect,
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Editing, FormulaEdit, CategoryAdd, ItemAdd, ExportPrompt, CommandMode,
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SearchMode, ImportWizard,
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}
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// Keymap::lookup(&self, key, mods) -> Option<&Binding>
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// Fallback chain: exact(key,mods) → Char with NONE mods → AnyChar → Any
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// KeymapSet::default_keymaps() -> Self [builds all 14 mode keymaps]
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// KeymapSet::dispatch(&self, ctx, key, mods) -> Option<Vec<Box<dyn Effect>>>
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```
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---
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## File Format (.improv)
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Plain-text markdown-like. **Not JSON** (JSON is legacy, auto-detected by `{` prefix).
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```
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# Model Name
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## Category: Region
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- North
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- South
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- East [Coastal] ← item in group "Coastal"
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- West [Coastal]
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> Coastal ← group definition
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## Category: Measure
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- Revenue
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- Cost
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- Profit
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## Formulas
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- Profit = Revenue - Cost [Measure] ← [TargetCategory]
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## Data
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Region=East, Measure=Revenue = 1200
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Region=East, Measure=Cost = 800
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Region=West, Measure=Revenue = "pending" ← text value in quotes
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## View: Default (active)
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Region: row
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Measure: column
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Time: page, Q1 ← page axis with selected item
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hidden: Region/Internal
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collapsed: Time/2024
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format: ,.2f
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```
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Gzip variant: `.improv.gz` (same content, gzipped). Persistence code: `persistence/mod.rs`.
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---
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## CLI
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```
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improvise [model.improv] # open TUI (default)
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improvise import data.csv [--no-wizard] [-o out] # import CSV/JSON
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improvise cmd 'add-cat Region' -f model.improv # headless command(s)
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improvise script setup.txt -f model.improv # run script file
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```
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Import flags: `--category`, `--measure`, `--time`, `--skip`, `--extract`, `--axis`, `--formula`, `--name`.
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---
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## Key Dependencies
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| Crate | Purpose |
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|-------|---------|
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| ratatui 0.29 | TUI framework |
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| crossterm 0.28 | Terminal backend |
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| clap 4.6 (derive) | CLI parsing |
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| serde + serde_json | Serialization |
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| indexmap 2 | Ordered maps (categories, views) |
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| anyhow | Error handling |
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| chrono 0.4 | Date parsing in import |
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| flate2 | Gzip for .improv.gz |
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| csv | CSV parsing |
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| enum_dispatch | CLI subcommand dispatch |
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| **dev:** proptest, tempfile | Property testing, temp dirs |
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---
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## File Inventory
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Lines / tests / path — grouped by layer.
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### Model layer
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```
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1692 / 66t model/types.rs Model struct, formula eval, CRUD, MAX_CATEGORIES=12
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621 / 28t model/cell.rs CellKey (canonical sort), CellValue, DataStore (interned)
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216 / 6t model/category.rs Category, Item, Group, CategoryKind
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79 / 3t model/symbol.rs Symbol interning (SymbolTable)
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6 / 0t model/mod.rs
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```
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### Formula layer
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```
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461 / 8t formula/parser.rs Recursive descent parser → Formula AST
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77 / 0t formula/ast.rs Expr, BinOp, AggFunc, Formula, Filter (data only)
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5 / 0t formula/mod.rs
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```
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### View layer
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```
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1013 / 23t view/layout.rs GridLayout (pure fn of Model+View), records mode, drill
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521 / 28t view/types.rs View config (axes, pages, hidden, collapsed, format)
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21 / 0t view/axis.rs Axis enum {Row, Column, Page, None}
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7 / 0t view/mod.rs
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```
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### Command layer
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```
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3373 / 21t command/cmd.rs Cmd trait, CmdContext, CmdRegistry, 40+ commands
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1068 / 22t command/keymap.rs KeyPattern, Binding, Keymap, ModeKey, 14 mode keymaps
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236 / 19t command/parse.rs Script/command-line parser (prefix syntax)
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12 / 0t command/mod.rs
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```
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### UI layer
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```
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942 / 0t ui/effect.rs Effect trait, 50+ effect types (all state mutations)
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914 / 30t ui/app.rs App state, AppMode (15 variants), handle_key, autosave
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1036 / 13t ui/grid.rs GridWidget (ratatui), col widths, rendering
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617 / 0t ui/help.rs 5-page help overlay, HELP_PAGE_COUNT=5
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347 / 0t ui/import_wizard_ui.rs Import wizard overlay rendering
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165 / 6t ui/cat_tree.rs Category tree flattener for panel
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113 / 0t ui/view_panel.rs View list panel
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107 / 0t ui/category_panel.rs Category tree panel
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95 / 0t ui/tile_bar.rs Tile bar (axis assignment tiles)
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87 / 0t ui/panel.rs Generic panel frame widget
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81 / 0t ui/formula_panel.rs Formula list panel
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67 / 0t ui/which_key.rs Prefix-key hint popup
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12 / 0t ui/mod.rs
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```
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### Import layer
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```
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773 / 15t import/wizard.rs ImportPipeline + ImportWizard
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292 / 9t import/analyzer.rs Field kind detection (Category/Measure/Time/Skip)
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244 / 8t import/csv_parser.rs CSV parsing, multi-file merge
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3 / 0t import/mod.rs
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```
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### Top-level
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```
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400 / 0t draw.rs TUI event loop (run_tui), frame composition
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391 / 0t main.rs CLI entry (clap): open, import, cmd, script
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228 / 29t format.rs Number display formatting (view-only rounding)
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806 / 22t persistence/mod.rs .improv save/load (markdown format + gzip + legacy JSON)
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```
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### Context docs
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```
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context/SPEC.md Feature specification
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context/design-principles.md Architectural principles
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context/plan.md Show HN launch plan
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context/repo-map.md This file
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```
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**Total: ~15,875 lines, 356 tests.**
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---
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## Testing Guidelines
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### Coverage target
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Aim for **~80% line and branch coverage** on logic code. This is a quality floor, not a
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ceiling — go higher where the code warrants it, but don't chase 100% on rendering
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widgets or write tests that just exercise trivial getters. Coverage should be run with
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`cargo llvm-cov` (available via `nix develop`).
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### What to test and how
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| Layer | Approach | Notes |
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|-------|----------|-------|
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| **Model** (types, cell, category, symbol) | Unit tests + **proptest** | The data model is the foundation. Property tests catch invariant violations that hand-picked cases miss (see CellKey sort invariant, axis consistency). |
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| **Formula** (parser, eval) | Unit tests per operator/construct | Cover each BinOp, AggFunc, IF, WHERE, unary minus, chained formulas, error cases (div-by-zero, missing ref). Ensure eval uses full f64 precision — never display-rounded values. |
|
||||
| **View** (types, layout) | Unit tests + **proptest** | Property tests for axis assignment invariants (each category on exactly one axis, transpose is involutive, etc.). Unit tests for layout computation, records mode detection, drill. |
|
||||
| **Command** (cmd, keymap, parse) | Unit tests | Test command execution by building a `CmdContext` and asserting on returned effects. Test keymap lookup fallback chain. Test script parser with edge cases (quoting, comments, dots). |
|
||||
| **Persistence** | Round-trip tests | `save → load → save` must be identical. Cover groups, formulas, views, hidden items, legacy JSON detection. |
|
||||
| **Format** | Unit tests | Boundary cases: comma placement at 3/4/7 digits, negative numbers, rounding half-away-from-zero (not banker's), zero, small fractions. |
|
||||
| **Import** (analyzer, csv, wizard) | Unit tests | Field classification heuristics, CSV quoting (RFC 4180), multi-file merge, date extraction. |
|
||||
| **UI rendering** (grid, panels, draw, help) | Generally skip | Ratatui widgets are hard to unit-test and change frequently. Test the *logic* they consume (layout, cat_tree, format) rather than the rendering itself. |
|
||||
| **Effects** | Test indirectly | Effects are thin `apply` methods. Test via integration: send a key through `App::handle_key` and assert on resulting app state. The complex ones (drill reconciliation, import) deserve targeted unit tests. |
|
||||
|
||||
### Property tests (proptest)
|
||||
|
||||
Use property tests for **invariants that must hold across all inputs**, not as a
|
||||
substitute for example-based tests. Good candidates:
|
||||
|
||||
- Structural invariants: CellKey always sorted, each category on exactly one axis,
|
||||
toggle-collapse is involutive, hide/show roundtrips.
|
||||
- Serialization roundtrips: save/load identity.
|
||||
- Determinism: `evaluate` returns the same value for the same inputs.
|
||||
|
||||
Keep proptest case counts reasonable. The defaults (256 cases) are fine for most
|
||||
properties. Don't crank them up to thousands — the test suite should complete in
|
||||
under 2 seconds. If a property needs more cases to feel confident, that's a sign
|
||||
the input space should be constrained with better strategies, not brute-forced.
|
||||
|
||||
### Bug-fix workflow
|
||||
|
||||
Per CLAUDE.md: **write a test that demonstrates the bug before fixing it.** Prefer
|
||||
a small unit test targeting the specific function over an integration test. The test
|
||||
should fail on the current code, then pass after the fix. Mark regression tests
|
||||
with a doc-comment explaining the bug (see `model/types.rs` `formula_tests` for
|
||||
examples).
|
||||
|
||||
### What not to test
|
||||
|
||||
- Trivial struct constructors and enum definitions (`ast.rs`, `axis.rs`).
|
||||
- Ratatui `Widget::render` implementations — these are pure drawing code.
|
||||
- Module re-export files (`mod.rs`).
|
||||
- One-line delegation methods.
|
||||
|
||||
---
|
||||
|
||||
## Patterns to Know
|
||||
|
||||
1. **Commands never mutate.** They receive `&CmdContext` (read-only) and return `Vec<Box<dyn Effect>>`.
|
||||
2. **CellKey is always sorted.** Use `CellKey::new()` — never construct the inner Vec directly.
|
||||
3. **`category_mut()` for adding items.** `Model` has no `add_item` method; get the category first: `m.category_mut("Region").unwrap().add_item("East")`.
|
||||
4. **Virtual categories** `_Index` and `_Dim` always exist. `is_empty_model()` checks whether any *non-virtual* categories exist.
|
||||
5. **Display rounding is view-only.** `format_f64` (half-away-from-zero) is only called in rendering. Formula eval uses full f64.
|
||||
6. **Keybindings are per-mode.** `ModeKey::from_app_mode()` resolves the current mode, then the corresponding `Keymap` is looked up. Normal + `search_mode=true` maps to `SearchMode`.
|
||||
7. **`effect_cmd!` macro** generates a command struct that just produces effects. Use for simple commands without complex logic.
|
||||
8. **`.improv` format is markdown-like**, not JSON. See `persistence/mod.rs`. JSON is legacy only.
|
||||
9. **`IndexMap`** is used for categories and views to preserve insertion order.
|
||||
10. **`MAX_CATEGORIES = 12`** applies only to `CategoryKind::Regular`. Virtual/Label categories are exempt.
|
||||
Reference in New Issue
Block a user