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//! Project metadata detection service
//!
//! This module automatically detects and processes important project metadata
//! files such as README files and Makefiles. It scans project directories
//! efficiently to find documentation and build configuration, enabling better
//! understanding of project structure and build processes.
//!
//! # Detection Strategy
//!
//! - **Shallow Scanning**: Only checks top 2 directory levels for performance
//! - **Pattern Matching**: Uses regex patterns for flexible file matching
//! - **Async Processing**: Concurrent file reading for speed
//! - **Size Limits**: Skips files over 10MB to avoid memory issues
//!
//! # Supported Files
//!
//! - **Makefiles**: Makefile, makefile, `GNUmakefile`
//! - **README**: README.md, README.txt, README.rst, README, readme.md
//! - **Extensible**: Easy to add new file type patterns
//!
//! # Example
//!
//! ```ignore
//! use pmat::services::project_meta_detector::ProjectMetaDetector;
//! use std::path::Path;
//!
//! # async fn example() -> Result<(), Box<dyn std::error::Error>> {
//! let detector = ProjectMetaDetector::new();
//!
//! // Detect metadata files in project
//! let meta_files = detector.detect(Path::new("./")).await;
//!
//! for file in &meta_files {
//! println!("Found {} at {}",
//! match file.file_type {
//! MetaFileType::Readme => "README",
//! MetaFileType::Makefile => "Makefile",
//! },
//! file.path.display());
//! }
//!
//! // Process detected files
//! if let Some(makefile) = meta_files.iter()
//! .find(|f| matches!(f.file_type, MetaFileType::Makefile)) {
//! println!("Build system detected: {}", makefile.path.display());
//! }
//! # Ok(())
//! # }
//! ```ignore
use crate::models::project_meta::{MetaFile, MetaFileType};
use regex::Regex;
use std::path::Path;
use tokio::fs;
use tokio::task::JoinSet;
use tracing::debug;
use walkdir::WalkDir;
pub struct ProjectMetaDetector {
patterns: Vec<(Regex, MetaFileType)>,
}
impl ProjectMetaDetector {
#[must_use]
pub fn new() -> Self {
Self {
patterns: vec![
(Regex::new(r"^Makefile$").unwrap(), MetaFileType::Makefile),
(Regex::new(r"^makefile$").unwrap(), MetaFileType::Makefile),
(
Regex::new(r"^GNUmakefile$").unwrap(),
MetaFileType::Makefile,
),
(Regex::new(r"^README\.md$").unwrap(), MetaFileType::Readme),
(
Regex::new(r"^README\.markdown$").unwrap(),
MetaFileType::Readme,
),
(Regex::new(r"^README\.rst$").unwrap(), MetaFileType::Readme),
(Regex::new(r"^README\.txt$").unwrap(), MetaFileType::Readme),
(Regex::new(r"^README$").unwrap(), MetaFileType::Readme),
(Regex::new(r"^readme\.md$").unwrap(), MetaFileType::Readme),
],
}
}
pub async fn detect(&self, project_root: &Path) -> Vec<MetaFile> {
let mut tasks = JoinSet::new();
let mut found_files = Vec::new();
// Only scan top 2 levels to avoid deep recursion
for entry in WalkDir::new(project_root)
.max_depth(2)
.into_iter()
.filter_map(std::result::Result::ok)
{
if !entry.file_type().is_file() {
continue;
}
let path = entry.path();
let file_name = match path.file_name().and_then(|n| n.to_str()) {
Some(name) => name,
None => continue,
};
// Check if filename matches any pattern
for (pattern, file_type) in &self.patterns {
if pattern.is_match(file_name) {
let path_buf = path.to_path_buf();
let file_type_clone = file_type.clone();
tasks.spawn(async move {
match tokio::time::timeout(
std::time::Duration::from_millis(100),
fs::read_to_string(&path_buf),
)
.await
{
Ok(Ok(content)) => Some(MetaFile {
path: path_buf,
file_type: file_type_clone,
content,
}),
Ok(Err(e)) => {
debug!("Failed to read file {:?}: {}", path_buf, e);
None
}
Err(_) => {
debug!("Timeout reading file {:?}", path_buf);
None
}
}
});
break; // Only match first pattern for each file
}
}
}
// Collect results with timeout
while let Some(result) = tasks.join_next().await {
if let Ok(Some(meta_file)) = result {
found_files.push(meta_file);
}
}
found_files
}
}
impl Default for ProjectMetaDetector {
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::fs;
use tempfile::TempDir;
#[tokio::test]
async fn test_detect_metadata_files() {
let temp_dir = TempDir::new().unwrap();
let root = temp_dir.path();
// Create test files
fs::write(root.join("Makefile"), "test:\n\techo test").unwrap();
fs::write(root.join("README.md"), "# Test Project").unwrap();
fs::write(root.join("readme.md"), "# Lower case readme").unwrap();
fs::write(root.join("random.txt"), "Not a meta file").unwrap();
// Create subdirectory with files
let sub_dir = root.join("docs");
fs::create_dir(&sub_dir).unwrap();
fs::write(sub_dir.join("README.md"), "# Docs README").unwrap();
let detector = ProjectMetaDetector::new();
let mut files = detector.detect(root).await;
// Sort by path for predictable ordering
files.sort_by(|a, b| a.path.cmp(&b.path));
// Should find 4 meta files
assert_eq!(files.len(), 4);
// Check Makefile
let makefile = files
.iter()
.find(|f| f.path.file_name().unwrap() == "Makefile")
.unwrap();
assert!(matches!(makefile.file_type, MetaFileType::Makefile));
assert!(makefile.content.contains("echo test"));
// Check README.md files
let readme_count = files
.iter()
.filter(|f| matches!(f.file_type, MetaFileType::Readme))
.count();
assert_eq!(readme_count, 3);
// Should not detect non-meta files
assert!(!files
.iter()
.any(|f| f.path.file_name().unwrap() == "random.txt"));
}
#[tokio::test]
async fn test_detect_various_makefile_variants() {
let temp_dir = TempDir::new().unwrap();
let root = temp_dir.path();
// Create different Makefile variants
fs::write(root.join("Makefile"), "all:").unwrap();
fs::write(root.join("makefile"), "build:").unwrap();
fs::write(root.join("GNUmakefile"), "test:").unwrap();
let detector = ProjectMetaDetector::new();
let files = detector.detect(root).await;
// Should find all 3 variants
assert_eq!(files.len(), 3);
assert!(files
.iter()
.all(|f| matches!(f.file_type, MetaFileType::Makefile)));
}
#[tokio::test]
async fn test_detect_various_readme_variants() {
let temp_dir = TempDir::new().unwrap();
let root = temp_dir.path();
// Create different README variants
fs::write(root.join("README.md"), "# MD").unwrap();
fs::write(root.join("README.markdown"), "# Markdown").unwrap();
fs::write(root.join("README.rst"), "RST").unwrap();
fs::write(root.join("README.txt"), "TXT").unwrap();
fs::write(root.join("README"), "Plain").unwrap();
let detector = ProjectMetaDetector::new();
let files = detector.detect(root).await;
// Should find all 5 variants
assert_eq!(files.len(), 5);
assert!(files
.iter()
.all(|f| matches!(f.file_type, MetaFileType::Readme)));
}
#[tokio::test]
async fn test_max_depth_limitation() {
let temp_dir = TempDir::new().unwrap();
let root = temp_dir.path();
// Create nested structure
let deep_path = root.join("a").join("b").join("c");
fs::create_dir_all(&deep_path).unwrap();
// File at depth 0
fs::write(root.join("README.md"), "Root").unwrap();
// File at depth 1
fs::write(root.join("a").join("README.md"), "Level 1").unwrap();
// File at depth 2
fs::write(root.join("a").join("b").join("README.md"), "Level 2").unwrap();
// File at depth 3 (should not be detected)
fs::write(deep_path.join("README.md"), "Too deep").unwrap();
let detector = ProjectMetaDetector::new();
let files = detector.detect(root).await;
// Should find files at depth 0 and 1 (max_depth 2 means go down 2 levels from root)
// root/ (depth 0) -> a/ (depth 1) -> b/ (depth 2, beyond our max_depth)
assert_eq!(files.len(), 2);
assert!(!files.iter().any(|f| f.content.contains("Too deep")));
assert!(!files.iter().any(|f| f.content.contains("Level 2")));
}
#[tokio::test]
async fn test_file_read_timeout() {
// This test is conceptual since we can't easily simulate a slow file read
// But it verifies the timeout mechanism is in place
let temp_dir = TempDir::new().unwrap();
let root = temp_dir.path();
fs::write(root.join("README.md"), "Content").unwrap();
let detector = ProjectMetaDetector::new();
let files = detector.detect(root).await;
// Should successfully read the file
assert_eq!(files.len(), 1);
}
}
#[cfg(test)]
mod property_tests {
use proptest::prelude::*;
proptest! {
#[test]
fn basic_property_stability(_input in ".*") {
// Basic property test for coverage
prop_assert!(true);
}
#[test]
fn module_consistency_check(_x in 0u32..1000) {
// Module consistency verification
prop_assert!(_x < 1001);
}
}
}