tokmd_scan/

lib.rs

//! # tokmd-scan
//!
//! **Tier 1 (Adapter)**
//!
//! This crate adapts the `tokei` library for use within `tokmd`.
//! It isolates the dependency on `tokei` to a single location.
//!
//! ## What belongs here
//! * Tokei configuration and invocation
//! * Mapping `tokmd` args to `tokei` config
//!
//! ## What does NOT belong here
//! * Business logic (filtering, sorting, aggregation)
//! * Output formatting
//! * Receipt construction

use anyhow::Result;
use std::collections::BTreeSet;
use std::fs;
use std::path::{Component, Path, PathBuf};
use tokei::{Config, Languages};

use tokmd_settings::ScanOptions;
use tokmd_types::ConfigMode;

/// A single logical file supplied from memory rather than the host filesystem.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InMemoryFile {
    pub path: PathBuf,
    pub bytes: Vec<u8>,
}

impl InMemoryFile {
    #[must_use]
    pub fn new(path: impl Into<PathBuf>, bytes: impl Into<Vec<u8>>) -> Self {
        Self {
            path: path.into(),
            bytes: bytes.into(),
        }
    }
}

/// A scan result that keeps its backing temp root alive for downstream row modeling.
///
/// Keep this wrapper alive while any downstream code needs to read file metadata from
/// the scanned paths. `tokmd-model` uses the underlying paths to compute byte and token
/// counts after the scan phase.
///
/// When converting these scan results into `FileRow`s, pass [`Self::strip_prefix`] as the
/// `strip_prefix` argument so receipts keep the logical in-memory paths rather than the
/// temp backing root.
#[derive(Debug)]
pub struct MaterializedScan {
    languages: Languages,
    logical_paths: Vec<PathBuf>,
    root: tempfile::TempDir,
}

impl MaterializedScan {
    #[must_use]
    pub fn languages(&self) -> &Languages {
        &self.languages
    }

    #[must_use]
    pub fn logical_paths(&self) -> &[PathBuf] {
        &self.logical_paths
    }

    #[must_use]
    pub fn strip_prefix(&self) -> &Path {
        self.root.path()
    }
}

/// Scans a set of paths and computes line counts for each language found.
///
/// # Examples
///
/// ```
/// use std::fs;
/// use std::path::PathBuf;
/// use tokmd_settings::ScanOptions;
/// use tokmd_types::ConfigMode;
/// use tokmd_scan::scan;
///
/// # fn main() -> anyhow::Result<()> {
/// let dir = tempfile::tempdir()?;
/// let file_path = dir.path().join("main.rs");
/// fs::write(&file_path, "fn main() { println!(\"hello\"); }\n")?;
///
/// let paths = vec![file_path];
/// let options = ScanOptions {
///     config: ConfigMode::None,
///     ..Default::default()
/// };
///
/// let languages = scan(&paths, &options)?;
/// let rust_stats = languages.get(&tokei::LanguageType::Rust).unwrap();
///
/// assert_eq!(rust_stats.code, 1);
/// # Ok(())
/// # }
/// ```
pub fn scan(paths: &[PathBuf], args: &ScanOptions) -> Result<Languages> {
    let cfg = config_from_scan_options(args);
    let ignores = ignored_patterns(args);
    for path in paths {
        if !path.exists() {
            anyhow::bail!("Path not found: {}", path.display());
        }
    }

    let mut languages = Languages::new();
    languages.get_statistics(paths, &ignores, &cfg);

    Ok(languages)
}

/// Build the `tokei` config used for a scan from clap-free `ScanOptions`.
#[must_use]
pub fn config_from_scan_options(args: &ScanOptions) -> Config {
    build_config(args)
}

/// Normalize ordered in-memory inputs into deterministic logical paths.
///
/// This rejects empty, absolute, escaping, and case-only-colliding paths so
/// native and browser callers see the same contract.
pub fn normalize_in_memory_paths(inputs: &[InMemoryFile]) -> Result<Vec<PathBuf>> {
    normalize_logical_paths(inputs, true)
}

pub fn scan_in_memory(inputs: &[InMemoryFile], args: &ScanOptions) -> Result<MaterializedScan> {
    let root = tempfile::tempdir()?;
    let logical_paths = normalize_in_memory_paths(inputs)?;

    for (logical_path, input) in logical_paths.iter().zip(inputs) {
        let full_path = root.path().join(logical_path);
        if let Some(parent) = full_path.parent() {
            fs::create_dir_all(parent)?;
        }
        fs::write(full_path, &input.bytes)?;
    }

    let scan_root = vec![root.path().to_path_buf()];
    let languages = scan(&scan_root, args)?;

    Ok(MaterializedScan {
        languages,
        logical_paths,
        root,
    })
}

fn build_config(args: &ScanOptions) -> Config {
    let mut cfg = match args.config {
        ConfigMode::Auto => Config::from_config_files(),
        ConfigMode::None => Config::default(),
    };

    // Only override config file settings when the user explicitly asked for it.
    if args.hidden {
        cfg.hidden = Some(true);
    }
    if args.no_ignore {
        cfg.no_ignore = Some(true);
        cfg.no_ignore_dot = Some(true);
        cfg.no_ignore_parent = Some(true);
        cfg.no_ignore_vcs = Some(true);
    }
    if args.no_ignore_dot {
        cfg.no_ignore_dot = Some(true);
    }
    if args.no_ignore_parent {
        cfg.no_ignore_parent = Some(true);
    }
    if args.no_ignore_vcs {
        cfg.no_ignore_vcs = Some(true);
    }
    if args.treat_doc_strings_as_comments {
        cfg.treat_doc_strings_as_comments = Some(true);
    }

    cfg
}

fn ignored_patterns(args: &ScanOptions) -> Vec<&str> {
    args.excluded.iter().map(|s| s.as_str()).collect()
}

fn normalize_logical_paths(
    inputs: &[InMemoryFile],
    case_insensitive: bool,
) -> Result<Vec<PathBuf>> {
    let mut seen = BTreeSet::new();
    let mut normalized = Vec::with_capacity(inputs.len());

    for input in inputs {
        let logical_path = normalize_logical_path(&input.path)?;
        if !seen.insert(logical_path_key(&logical_path, case_insensitive)) {
            anyhow::bail!("Duplicate in-memory path: {}", logical_path.display());
        }
        normalized.push(logical_path);
    }

    Ok(normalized)
}

fn logical_path_key(path: &Path, case_insensitive: bool) -> String {
    let rendered = path.to_string_lossy();
    if case_insensitive {
        rendered.to_lowercase()
    } else {
        rendered.into_owned()
    }
}

fn normalize_logical_path(path: &Path) -> Result<PathBuf> {
    if path.as_os_str().is_empty() {
        anyhow::bail!("In-memory path must not be empty");
    }

    let mut normalized = PathBuf::new();
    for component in path.components() {
        match component {
            Component::Normal(segment) => normalized.push(segment),
            Component::CurDir => {}
            Component::ParentDir => {
                anyhow::bail!(
                    "In-memory path must not contain parent traversal: {}",
                    path.display()
                );
            }
            Component::RootDir | Component::Prefix(_) => {
                anyhow::bail!("In-memory path must be relative: {}", path.display());
            }
        }
    }

    if normalized.as_os_str().is_empty() {
        anyhow::bail!("In-memory path must resolve to a file: {}", path.display());
    }

    Ok(normalized)
}

#[cfg(test)]
mod tests {
    use super::*;

    fn default_scan_options() -> ScanOptions {
        ScanOptions {
            excluded: vec![],
            config: ConfigMode::Auto,
            hidden: false,
            no_ignore: false,
            no_ignore_parent: false,
            no_ignore_dot: false,
            no_ignore_vcs: false,
            treat_doc_strings_as_comments: false,
        }
    }

    // Get a valid test path - the crate's own source directory
    fn test_path() -> PathBuf {
        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("src")
    }

    // ========================
    // Basic Scan Tests
    // ========================

    #[test]
    fn scan_finds_rust_files() -> Result<()> {
        let args = default_scan_options();
        let paths = vec![test_path()];
        let result = scan(&paths, &args)?;
        // Should find at least this lib.rs file
        assert!(!result.is_empty());
        assert!(result.get(&tokei::LanguageType::Rust).is_some());
        Ok(())
    }

    #[test]
    fn scan_with_nonexistent_path_returns_error() -> Result<()> {
        let args = default_scan_options();
        let dir = tempfile::tempdir()?;
        let nonexistent = dir.path().join("definitely-not-created");
        let paths = vec![nonexistent];
        let result = scan(&paths, &args);
        // Should return an error for nonexistent paths
        assert!(result.is_err());
        assert!(
            result
                .expect_err("should have failed")
                .to_string()
                .contains("Path not found")
        );
        Ok(())
    }

    // ========================
    // Config Flag Tests
    // ========================

    #[test]
    fn scan_with_hidden_flag() -> Result<()> {
        let mut args = default_scan_options();
        args.hidden = true;
        let paths = vec![test_path()];
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_no_ignore_flag() -> Result<()> {
        let mut args = default_scan_options();
        args.no_ignore = true;
        let paths = vec![test_path()];
        // no_ignore should imply all other no_ignore_* flags
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_individual_no_ignore_flags() -> Result<()> {
        let mut args = default_scan_options();
        args.no_ignore_parent = true;
        args.no_ignore_dot = true;
        args.no_ignore_vcs = true;
        let paths = vec![test_path()];
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_treat_doc_strings_as_comments() -> Result<()> {
        let mut args = default_scan_options();
        args.treat_doc_strings_as_comments = true;
        let paths = vec![test_path()];
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_config_mode_none() -> Result<()> {
        let mut args = default_scan_options();
        args.config = ConfigMode::None;
        let paths = vec![test_path()];
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_excluded_patterns() -> Result<()> {
        let mut args = default_scan_options();
        args.excluded = vec!["target".to_string(), "*.min.js".to_string()];
        let paths = vec![test_path()];
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_with_all_flags_combined() -> Result<()> {
        let args = ScanOptions {
            excluded: vec!["node_modules".to_string()],
            config: ConfigMode::None,
            hidden: true,
            no_ignore: true,
            no_ignore_parent: true,
            no_ignore_dot: true,
            no_ignore_vcs: true,
            treat_doc_strings_as_comments: true,
        };
        let paths = vec![test_path()];
        // Should handle all flags without panicking
        let result = scan(&paths, &args);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn scan_returns_code_stats() -> Result<()> {
        let args = default_scan_options();
        let paths = vec![test_path()];
        let result = scan(&paths, &args)?;

        let rust = result
            .get(&tokei::LanguageType::Rust)
            .expect("should find rust in src/lib.rs");
        // The lib.rs file should have some code
        assert!(rust.code > 0);
        assert!(rust.lines() > 0);
        Ok(())
    }

    #[test]
    fn normalize_logical_path_strips_dot_segments() -> Result<()> {
        let normalized = normalize_logical_path(Path::new("./src/./lib.rs"))?;
        assert_eq!(normalized, PathBuf::from("src/lib.rs"));
        Ok(())
    }

    #[test]
    fn normalize_logical_path_rejects_absolute_paths() {
        let err = normalize_logical_path(Path::new("/src/lib.rs")).unwrap_err();
        assert!(err.to_string().contains("must be relative"));
    }

    #[test]
    fn normalize_logical_path_rejects_parent_traversal() {
        let err = normalize_logical_path(Path::new("../src/lib.rs")).unwrap_err();
        assert!(err.to_string().contains("parent traversal"));
    }

    #[test]
    fn normalize_logical_paths_rejects_duplicate_after_normalization() {
        let inputs = vec![
            InMemoryFile::new("./src/lib.rs", "fn main() {}\n"),
            InMemoryFile::new("src/lib.rs", "fn main() {}\n"),
        ];

        let err = normalize_logical_paths(&inputs, false).unwrap_err();
        assert!(err.to_string().contains("Duplicate in-memory path"));
    }

    #[test]
    fn normalize_logical_paths_rejects_case_only_collision_on_case_insensitive_fs() {
        let inputs = vec![
            InMemoryFile::new("src/lib.rs", "fn main() {}\n"),
            InMemoryFile::new("SRC/LIB.rs", "fn main() {}\n"),
        ];

        let err = normalize_logical_paths(&inputs, true).unwrap_err();
        assert!(err.to_string().contains("Duplicate in-memory path"));
    }
}