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//! LOC command - Count lines of code with type breakdown
//!
//! Provides language-aware line counting:
//! - Code lines: Lines containing executable code
//! - Comment lines: Lines containing only comments
//! - Blank lines: Empty lines or lines with only whitespace
//!
//! # Session 15 Phase 2
//!
//! Implements spec.md Section 1 (LOC Command).
//!
//! # Invariants
//!
//! - `code_lines + comment_lines + blank_lines == total_lines`
//! - Binary files are skipped with warning
//! - Files > 10MB are skipped with warning
//!
//! # Example
//!
//! ```bash
//! # Analyze a single file
//! tldr loc src/main.rs
//!
//! # Analyze a directory with per-file breakdown
//! tldr loc src/ --by-file
//!
//! # Filter by language
//! tldr loc . --lang python
//!
//! # Exclude patterns
//! tldr loc . --exclude "*.test.py" --exclude "migrations/*"
//! ```
use std::path::PathBuf;
use anyhow::Result;
use clap::Args;
use tldr_core::metrics::loc::{analyze_loc, LocOptions, LocReport};
use tldr_core::Language;
use crate::output::{OutputFormat, OutputWriter};
/// Count lines of code with type breakdown (code, comments, blanks)
#[derive(Debug, Args)]
pub struct LocArgs {
/// Directory or file to analyze
#[arg(default_value = ".")]
pub path: PathBuf,
/// Filter to specific language
#[arg(long, short = 'l')]
pub lang: Option<Language>,
/// Show per-file breakdown
#[arg(long)]
pub by_file: bool,
/// Aggregate by directory
#[arg(long)]
pub by_dir: bool,
/// Exclude patterns (glob syntax), can be specified multiple times
#[arg(long, short = 'e')]
pub exclude: Vec<String>,
/// Include hidden files (dotfiles)
#[arg(long)]
pub include_hidden: bool,
/// Ignore .gitignore rules
#[arg(long)]
pub no_gitignore: bool,
/// Maximum files to process (0 = unlimited)
#[arg(long, default_value = "0")]
pub max_files: usize,
}
impl LocArgs {
/// Run the LOC command
pub fn run(&self, format: OutputFormat, quiet: bool) -> Result<()> {
let writer = OutputWriter::new(format, quiet);
writer.progress(&format!("Counting lines in {}...", self.path.display()));
// Build options
let options = LocOptions {
lang: self.lang,
by_file: self.by_file,
by_dir: self.by_dir,
exclude: self.exclude.clone(),
include_hidden: self.include_hidden,
gitignore: !self.no_gitignore,
max_files: self.max_files,
max_file_size_mb: 10, // Default 10MB limit
};
// Analyze
let report = analyze_loc(&self.path, &options)?;
// Output based on format
if writer.is_text() {
let text = format_loc_text(&report);
writer.write_text(&text)?;
} else {
writer.write(&report)?;
}
Ok(())
}
}
/// Format LOC report for human-readable text output.
/// Uses plain aligned text (no box-drawing tables) for token efficiency.
fn format_loc_text(report: &LocReport) -> String {
use crate::output::{common_path_prefix, strip_prefix_display};
use colored::Colorize;
use std::path::Path;
let mut output = String::new();
// Summary
let summary = &report.summary;
output.push_str(&format!(
"Lines of Code ({} files, {} total)\n\n",
summary.total_files, summary.total_lines,
));
output.push_str(&format!(
" Code: {:>6} ({:.1}%)\n",
summary.code_lines, summary.code_percent
));
output.push_str(&format!(
" Comments: {:>6} ({:.1}%)\n",
summary.comment_lines, summary.comment_percent
));
output.push_str(&format!(
" Blank: {:>6} ({:.1}%)\n",
summary.blank_lines, summary.blank_percent
));
// By language (plain text table)
if !report.by_language.is_empty() {
output.push_str("\nBy Language:\n");
let max_lang = report
.by_language
.iter()
.map(|e| e.language.len())
.max()
.unwrap_or(8)
.max(8);
output.push_str(&format!(
" {:<width$} {:>5} {:>6} {:>6} {:>5} {:>6}\n",
"Language",
"Files",
"Code",
"Comment",
"Blank",
"Total",
width = max_lang,
));
for entry in &report.by_language {
output.push_str(&format!(
" {:<width$} {:>5} {:>6} {:>6} {:>5} {:>6}\n",
entry.language,
entry.files,
entry.code_lines,
entry.comment_lines,
entry.blank_lines,
entry.total_lines,
width = max_lang,
));
}
}
// By file (if requested and present)
if let Some(by_file) = &report.by_file {
if !by_file.is_empty() {
output.push_str("\nBy File:\n");
// Strip common path prefix
let paths: Vec<&Path> = by_file.iter().map(|e| e.path.as_path()).collect();
let prefix = common_path_prefix(&paths);
let display_count = by_file.len().min(50);
let max_path = by_file
.iter()
.take(display_count)
.map(|e| strip_prefix_display(&e.path, &prefix).len())
.max()
.unwrap_or(4)
.clamp(4, 50);
output.push_str(&format!(
" {:<width$} {:>4} {:>6} {:>6} {:>5} {:>6}\n",
"File",
"Lang",
"Code",
"Comment",
"Blank",
"Total",
width = max_path,
));
for entry in by_file.iter().take(display_count) {
let rel = strip_prefix_display(&entry.path, &prefix);
let display_path = if rel.len() > 50 {
format!("...{}", &rel[rel.len() - 47..])
} else {
rel
};
output.push_str(&format!(
" {:<width$} {:>4} {:>6} {:>6} {:>5} {:>6}\n",
display_path,
entry.language,
entry.code_lines,
entry.comment_lines,
entry.blank_lines,
entry.total_lines,
width = max_path,
));
}
if by_file.len() > display_count {
output.push_str(&format!(
" ... and {} more files\n",
by_file.len() - display_count
));
}
}
}
// By directory (if requested and present)
if let Some(by_dir) = &report.by_directory {
if !by_dir.is_empty() {
output.push_str("\nBy Directory:\n");
let paths: Vec<&Path> = by_dir.iter().map(|e| e.path.as_path()).collect();
let prefix = common_path_prefix(&paths);
let max_dir = by_dir
.iter()
.take(30)
.map(|e| strip_prefix_display(&e.path, &prefix).len())
.max()
.unwrap_or(4)
.max(4);
output.push_str(&format!(
" {:<width$} {:>6} {:>6} {:>5} {:>6}\n",
"Directory",
"Code",
"Comment",
"Blank",
"Total",
width = max_dir,
));
for entry in by_dir.iter().take(30) {
let rel = strip_prefix_display(&entry.path, &prefix);
output.push_str(&format!(
" {:<width$} {:>6} {:>6} {:>5} {:>6}\n",
rel,
entry.code_lines,
entry.comment_lines,
entry.blank_lines,
entry.total_lines,
width = max_dir,
));
}
}
}
// Warnings
if !report.warnings.is_empty() {
output.push_str(&"\nWarnings:\n".yellow().to_string());
for warning in &report.warnings {
output.push_str(&format!(" - {}\n", warning));
}
}
output
}