codebank 0.4.5

# CODE BANK IMPLEMENTATION PLAN

## Requirements Analysis
- Core Requirements:
  - [ ] Generate markdown files from source code with proper formatting
  - [ ] Support multiple languages (Rust, Python, TypeScript, C)
  - [ ] Provide different output strategies (full code, public interfaces only)
  - [ ] Create a usable command-line interface
- Technical Constraints:
  - [ ] Use tree-sitter for language parsing
  - [ ] Support extensibility for additional languages
  - [ ] Ensure proper error handling
  - [ ] Follow Rust best practices for code organization

## Component Analysis
- Core Framework:
  - Changes needed: Implement the Bank trait
  - Dependencies: File system access, language parsers
- Language Parsers:
  - Changes needed: Complete implementation for each language
  - Dependencies: tree-sitter grammars
- CLI Interface:
  - Changes needed: Build command-line argument handling
  - Dependencies: clap library

## Design Decisions
- Architecture:
  - [ ] Use trait-based design for extensibility
  - [ ] Maintain language-agnostic intermediate representation
  - [ ] Implement strategy pattern for output generation
- Algorithms:
  - [ ] Efficient directory traversal algorithm
  - [ ] Tree-sitter query optimization for parsing
  - [ ] Markdown generation with proper indentation

## Implementation Strategy
1. Phase 1: Core Implementation
   - [ ] Implement Rust parser (highest priority)
   - [ ] Implement Bank trait for code generation
   - [ ] Build basic CLI interface

2. Phase 2: Additional Languages
   - [ ] Implement Python parser
   - [ ] Implement TypeScript parser
   - [ ] Implement C parser

3. Phase 3: Refinement
   - [ ] Add configuration options
   - [ ] Create examples and documentation
   - [ ] Implement testing

## Testing Strategy
- Unit Tests:
  - [ ] Test language parsers with sample files
  - [ ] Test markdown generation
  - [ ] Test error handling
- Integration Tests:
  - [ ] End-to-end tests for CLI
  - [ ] Multi-language project tests
  - [ ] Edge case handling

## Documentation Plan
- [ ] Complete README with usage examples
- [ ] API documentation for library users
- [ ] Example projects demonstrating features

## Detailed Implementation Guide

### Rust Parser Implementation
1. Tree-sitter Grammar Integration:
   ```rust
   let mut parser = tree_sitter::Parser::new();
   parser.set_language(tree_sitter_rust::language())?;
   ```

2. Query Patterns for Rust Syntax:
   ```rust
   const FUNCTION_QUERY: &str = r#"
   (function_item
     name: (identifier) @function_name
     parameters: (parameters) @params
     return_type: (type_identifier)? @return_type
     body: (block) @body
   ) @function
   "#;
   ```

3. AST Traversal:
   ```rust
   fn traverse_node(&self, node: Node, source: &str) -> Result<Vec<CodeUnit>> {
       // Implementation based on node type
   }
   ```

4. Extract Public Interfaces:
   ```rust
   if node.kind() == "visibility_modifier" && node.utf8_text(source_code.as_bytes())? == "pub" {
       // Handle public item
   }
   ```

### Bank Implementation
1. Directory Traversal:
   ```rust
   use walkdir::WalkDir;

   fn traverse_directory(&self, dir: &Path) -> Result<Vec<FileUnit>> {
       for entry in WalkDir::new(dir).follow_links(true).into_iter().filter_map(|e| e.ok()) {
           if entry.file_type().is_file() {
               // Process file
           }
       }
   }
   ```

2. File Extension Detection:
   ```rust
   fn get_language(&self, path: &Path) -> Option<LanguageType> {
       match path.extension().and_then(OsStr::to_str) {
           Some("rs") => Some(LanguageType::Rust),
           Some("py") => Some(LanguageType::Python),
           // other cases
           _ => None,
       }
   }
   ```

3. Markdown Generation:
   ```rust
   fn generate_markdown(&self, file_units: Vec<FileUnit>, strategy: BankStrategy) -> String {
       let mut output = String::new();
       // Format header
       output.push_str("# Code Bank\n\n");

       for file in file_units {
           // Format file section
           output.push_str(&format!("## {}\n", file.path.display()));

           // Determine language for code block
           let lang = self.get_language_name(&file.path);
           output.push_str(&format!("```{}\n", lang));

           // Add code based on strategy
           match strategy {
               BankStrategy::Default => { /* full code */ },
               BankStrategy::Summary => { /* public interfaces only */ }
               // other cases
           }

           output.push_str("```\n\n");
       }

       output
   }
   ```

### CLI Implementation
1. Command-line Arguments:
   ```rust
   use clap::{Parser, ValueEnum};

   #[derive(Parser, Debug)]
   #[clap(author, version, about)]
   struct Args {
       /// Input directory path
       #[clap(short, long)]
       input: PathBuf,

       /// Output file path
       #[clap(short, long)]
       output: Option<PathBuf>,

       /// Output strategy
       #[clap(short, long, value_enum, default_value_t = OutputStrategy::Default)]
       strategy: OutputStrategy,
   }

   #[derive(Copy, Clone, Debug, ValueEnum)]
   enum OutputStrategy {
       Default,
       NoTests,
       Summary,
   }
   ```

2. Main Implementation:
   ```rust
   fn main() -> Result<()> {
       let args = Args::parse();

       // Convert output strategy
       let strategy = match args.strategy {
           OutputStrategy::Default => BankStrategy::Default,
           OutputStrategy::NoTests => BankStrategy::NoTests,
           OutputStrategy::Summary => BankStrategy::Summary,
       };

       // Create and use bank implementation
       let bank = CodeBank::new();
       let content = bank.generate(&args.input, strategy)?;

       // Output result
       if let Some(output_path) = args.output {
           fs::write(&output_path, content)?;
           println!("Code bank written to {}", output_path.display());
       } else {
           println!("{}", content);
       }

       Ok(())
   }
   ```

## Timeline and Milestones
1. Week 1: Rust parser implementation
2. Week 2: Bank trait implementation and basic CLI
3. Week 3: Additional language parsers
4. Week 4: Refinement, configuration, and documentation

## Creative Phase Components
- Architecture Design: Need to finalize the Bank implementation structure and the parser coordination
- Algorithm Design: Optimize tree-sitter queries for efficient parsing