clean_dev_dirs/

cleaner.rs

//! Build directory cleanup functionality.
//!
//! This module provides the core cleanup logic for removing build directories
//! from detected development projects. It handles parallel processing, progress
//! reporting, error handling, and provides detailed statistics about the
//! cleanup operation.

use anyhow::Result;
use colored::Colorize;
use humansize::{DECIMAL, format_size};
use indicatif::{ProgressBar, ProgressStyle};
use rayon::prelude::*;
use std::fs;
use std::sync::{Arc, Mutex};

use crate::project::{Project, Projects};

/// Handles the cleanup of build directories from development projects.
///
/// The `Cleaner` struct provides methods for removing build directories
/// (such as `target/` for Rust projects and `node_modules/` for Node.js projects)
/// with parallel processing, progress reporting, and comprehensive error handling.
pub struct Cleaner;

impl Cleaner {
    /// Create a new cleaner instance.
    ///
    /// # Returns
    ///
    /// A new `Cleaner` instance ready to perform cleanup operations.
    ///
    /// # Examples
    ///
    /// ```
    /// # use crate::Cleaner;
    /// let cleaner = Cleaner::new();
    /// ```
    #[must_use]
    pub fn new() -> Self {
        Self
    }

    /// Clean build directories from a collection of projects.
    ///
    /// This method performs the main cleanup operation by:
    /// 1. Setting up a progress bar for user feedback
    /// 2. Processing projects in parallel for efficiency
    /// 3. Collecting and reporting any errors that occur
    /// 4. Providing detailed statistics about the cleanup results
    ///
    /// # Arguments
    ///
    /// * `projects` - A collection of projects to clean
    ///
    /// # Panics
    ///
    /// This method may panic if the progress bar template string is invalid,
    /// though this should not occur under normal circumstances as the template
    /// is hardcoded and valid.
    ///
    /// # Output
    ///
    /// This method prints progress information and final statistics to stdout,
    /// including
    /// - Real-time progress during cleanup
    /// - Number of successfully cleaned projects
    /// - Number of failed projects (if any)
    /// - Total disk space freed
    /// - Difference between estimated and actual space freed
    ///
    /// # Examples
    ///
    /// ```
    /// # use crate::{Cleaner, Projects};
    /// let projects = Projects::from(vec![/* project instances */]);
    /// Cleaner::clean_projects(projects);
    /// ```
    ///
    /// # Performance
    ///
    /// This method uses parallel processing to clean multiple projects
    /// simultaneously, which can significantly reduce cleanup time for
    /// large numbers of projects.
    ///
    /// # Error Handling
    ///
    /// Individual project cleanup failures do not stop the overall process.
    /// All errors are collected and reported at the end, allowing the
    /// cleanup to proceed for projects that can be successfully processed.
    pub fn clean_projects(projects: Projects) {
        let total_projects = projects.len();
        let total_size: u64 = projects.get_total_size();

        println!("\n{}", "🧹 Starting cleanup...".cyan());

        // Create a progress bar
        let progress = ProgressBar::new(total_projects as u64);
        progress.set_style(
            ProgressStyle::default_bar()
                .template("[{elapsed_precise}] {bar:40.cyan/blue} {pos}/{len} {msg}")
                .unwrap()
                .progress_chars("█▉▊▋▌▍▎▏  "),
        );

        let cleaned_size = Arc::new(Mutex::new(0u64));
        let errors = Arc::new(Mutex::new(Vec::new()));

        // Clean projects in parallel
        projects.into_par_iter().for_each(|project| {
            let result = clean_single_project(&project);

            match result {
                Ok(freed_size) => {
                    let mut total_cleaned = cleaned_size.lock().unwrap();
                    *total_cleaned += freed_size;

                    progress.set_message(format!(
                        "Cleaned {} ({})",
                        project
                            .root_path
                            .file_name()
                            .and_then(|n| n.to_str())
                            .unwrap_or("unknown"),
                        format_size(freed_size, DECIMAL)
                    ));
                }
                Err(e) => {
                    let mut errors = errors.lock().unwrap();
                    errors.push(format!(
                        "Failed to clean {}: {e}",
                        project.build_arts.path.display()
                    ));
                }
            }

            progress.inc(1);
        });

        progress.finish_with_message("✅ Cleanup complete");

        // Report results
        let final_cleaned_size = *cleaned_size.lock().unwrap();
        let errors = errors.lock().unwrap();

        if !errors.is_empty() {
            println!("\n{}", "⚠️  Some errors occurred during cleanup:".yellow());
            for error in errors.iter() {
                eprintln!("  {}", error.red());
            }
        }

        let success_count = total_projects - errors.len();
        println!("\n{}", "📊 Cleanup Summary:".bold());
        println!(
            "  ✅ Successfully cleaned: {} projects",
            success_count.to_string().green()
        );

        if !errors.is_empty() {
            println!(
                "  ❌ Failed to clean: {} projects",
                errors.len().to_string().red()
            );
        }

        println!(
            "  💾 Total space freed: {}",
            format_size(final_cleaned_size, DECIMAL)
                .bright_green()
                .bold()
        );

        if final_cleaned_size != total_size {
            let difference = total_size.abs_diff(final_cleaned_size);
            println!(
                "  📋 Difference from estimate: {}",
                format_size(difference, DECIMAL).yellow()
            );
        }
    }
}

/// Clean the build directory for a single project.
///
/// This function handles the cleanup of an individual project's build directory.
/// It calculates the actual size before deletion and then removes the entire
/// directory tree.
///
/// # Arguments
///
/// * `project` - The project whose build directory should be cleaned
///
/// # Returns
///
/// - `Ok(u64)` - The number of bytes freed by the cleanup
/// - `Err(anyhow::Error)` - If the cleanup operation failed
///
/// # Behavior
///
/// 1. Checks if the build directory exists (returns 0 if not)
/// 2. Calculates the actual size of the directory before deletion
/// 3. Removes the entire directory tree
/// 4. Returns the amount of space freed
///
/// # Error Conditions
///
/// This function can fail if:
/// - The build directory cannot be removed due to permission issues
/// - Files within the directory are locked or in use by other processes
/// - The file system encounters I/O errors during deletion
///
/// # Examples
///
/// ```
/// # use crate::{Project, clean_single_project};
/// # use anyhow::Result;
/// let result = clean_single_project(&project);
/// match result {
///     Ok(freed_bytes) => println!("Freed {} bytes", freed_bytes),
///     Err(e) => eprintln!("Cleanup failed: {}", e),
/// }
/// ```
fn clean_single_project(project: &Project) -> Result<u64> {
    let build_dir = &project.build_arts.path;

    if !build_dir.exists() {
        return Ok(0);
    }

    // Get the actual size before deletion (might be different from the cached size)
    let actual_size = calculate_directory_size(build_dir);

    // Remove the build directory
    fs::remove_dir_all(build_dir)?;

    Ok(actual_size)
}

/// Calculate the total size of a directory and all its contents.
///
/// This function recursively traverses a directory tree and sums up the sizes
/// of all files within it. It handles errors gracefully by skipping files
/// that cannot be accessed.
///
/// # Arguments
///
/// * `path` - The directory path to measure
///
/// # Returns
///
/// The total size of all files in the directory tree, in bytes.
///
/// # Error Handling
///
/// This function is designed to be robust and will continue processing even
/// if individual files cannot be accessed. It silently skips:
/// - Files that cannot be read due to permission issues
/// - Broken symbolic links
/// - Files that are deleted while the scan is in progress
///
/// # Performance
///
/// This function can be I/O intensive for large directories with many files.
/// It processes files sequentially within each directory but may be called
/// in parallel for different directories by the cleanup process.
///
/// # Examples
///
/// ```
/// # use std::path::Path;
/// # use crate::calculate_directory_size;
/// let size = calculate_directory_size(Path::new("/path/to/directory"));
/// println!("Directory size: {} bytes", size);
/// ```
fn calculate_directory_size(path: &std::path::Path) -> u64 {
    let mut total_size = 0u64;

    for entry in walkdir::WalkDir::new(path) {
        if let Ok(entry) = entry {
            if entry.file_type().is_file()
                && let Ok(metadata) = entry.metadata()
            {
                total_size += metadata.len();
            }
        } else {
            // Skip errors for individual files
        }
    }

    total_size
}

impl Default for Cleaner {
    /// Create a default cleaner instance.
    ///
    /// This implementation allows `Cleaner::default()` to be used as an
    /// alternative to `Cleaner::new()` for creating cleaner instances.
    ///
    /// # Returns
    ///
    /// A new `Cleaner` instance with default settings.
    fn default() -> Self {
        Self::new()
    }
}