From 3812c9efd5321952eb456a451b4156386298aa1b Mon Sep 17 00:00:00 2001
From: Paul Campbell <pcampbell@kemitix.net>
Date: Mon, 30 Dec 2024 14:33:27 +0000
Subject: [PATCH] Initial commit

---
 .gitignore  |   2 +
 Cargo.lock  | 587 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  13 ++
 README.md   |  43 ++++
 src/main.rs | 172 +++++++++++++++
 5 files changed, 817 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..d81f12e
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..6d72f16
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "rename-files"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.4", features = ["derive"] }
+regex = "1.10"
+walkdir = "2.4"
+color-eyre = "0.6"
+
+[dev-dependencies]
+tempfile = "3.8"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8f8eb37
--- /dev/null
+++ b/README.md
@@ -0,0 +1,43 @@
+# rename-files
+
+A CLI application that takes a regex patten for search and replace and then recursively renames files according to the regex pattern.
+
+Uses `clap` to define and parse command-line arguments:
+
+- `-s` or `--search`: The regex pattern to search for
+- `-r` or `--replace`: The replacement pattern
+- `-d` or `--directory`: The starting directory (optional, defaults to current directory)
+- `--dry-run`: Option to preview changes without actually renaming files
+
+Recursively walks through the directory structure using `walkdir`.
+
+Applies the regex pattern to each file name and performs the replacement if there's a match.
+
+Provides a dry-run option to preview changes before making them.
+
+```bash
+# Replace "old" with "new" in all file names
+cargo run -- --search "old" --replace "new"
+
+# Replace numbers with "X" in all file names, starting from a specific directory
+cargo run -- --search "[0-9]" --replace "X" --directory "/path/to/dir"
+
+# Preview changes without actually renaming (dry run)
+cargo run -- --search "test_" --replace "" --dry-run
+```
+
+The program will:
+
+- Only rename files (not directories)
+- Show you what changes it's making
+- Handle errors gracefully
+- Allow you to preview changes with --dry-run before making actual changes
+
+Safety features:
+
+- Checks if the new filename would be different before attempting to rename
+- Uses proper error handling throughout
+- Provides feedback about what's being renamed
+- Allows preview of changes before making them
+
+> Remember that regex patterns are powerful and should be used carefully, especially when batch renaming files. It's recommended to always use the --dry-run option first to preview the changes before actually renaming files.
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b786799
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,172 @@
+use clap::Parser;
+use color_eyre::eyre::{Context, OptionExt};
+use regex::Regex;
+use walkdir::WalkDir;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Args {
+    /// Search pattern (regex)
+    #[arg(short, long)]
+    search: String,
+
+    /// Replace pattern
+    #[arg(short, long)]
+    replace: String,
+
+    /// Directory to start from (defaults to current directory)
+    #[arg(short, long, default_value = ".")]
+    directory: String,
+
+    /// Dry run (don't actually rename files)
+    #[arg(long)]
+    dry_run: bool,
+}
+
+// In your main.rs file, modify the main function:
+fn main() -> color_eyre::Result<()> {
+    let args = Args::parse();
+    run_rename(&args)
+}
+
+// Add this function that contains the main logic:
+fn run_rename(args: &Args) -> color_eyre::Result<()> {
+    // Move the existing main function logic here
+    let regex = Regex::new(&args.search).context("parsing search pattern")?;
+    println!("regex: {regex:#?}");
+
+    for entry in WalkDir::new(&args.directory) {
+        let entry = entry.context("invalid file entry")?;
+        if entry.file_type().is_file() {
+            let path = entry.path();
+            let file_name = path.file_name()
+                .and_then(|n| n.to_str())
+                .ok_or_eyre("Invalid file name")?;
+
+            if regex.is_match(file_name) {
+                let new_name = regex.replace_all(file_name, &args.replace);
+                let new_path = path.with_file_name(&*new_name);
+
+                if path != new_path {
+                    if args.dry_run {
+                        println!("Would rename:\n  '{}' to\n  '{}'\n",
+                            path.display(), new_path.display());
+                    } else {
+                        println!("Renaming:\n  '{}' to\n  '{}'\n",
+                            path.display(), new_path.display());
+                        std::fs::rename(path, new_path).context("renaming file")?;
+                    }
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::{self, File};
+    use tempfile::TempDir;
+
+    // Helper function to create a temporary directory with test files
+    fn setup_test_directory() -> TempDir {
+        let temp_dir = TempDir::new().unwrap();
+
+        // Create some test files
+        let test_files = vec![
+            "test_file1.txt",
+            "test_file2.txt",
+            "other_file.txt",
+            "nested/test_file3.txt",
+        ];
+
+        for file_name in test_files {
+            let path = temp_dir.path().join(file_name);
+            if let Some(parent) = path.parent() {
+                fs::create_dir_all(parent).unwrap();
+            }
+            File::create(path).unwrap();
+        }
+
+        temp_dir
+    }
+
+    #[test]
+    fn test_rename_files_dry_run() {
+        let temp_dir = setup_test_directory();
+        let temp_path = temp_dir.path().to_string_lossy().to_string();
+
+        // Create command line arguments
+        let args = Args {
+            search: String::from("test_"),
+            replace: String::from("new_"),
+            directory: temp_path.clone(),
+            dry_run: true,
+        };
+
+        // Override the command line parsing
+        let result = run_rename(&args);
+        assert!(result.is_ok());
+
+        // Verify files weren't actually renamed in dry run
+        assert!(temp_dir.path().join("test_file1.txt").exists());
+        assert!(temp_dir.path().join("test_file2.txt").exists());
+        assert!(!temp_dir.path().join("new_file1.txt").exists());
+    }
+
+    #[test]
+    fn test_rename_files_actual() {
+        let temp_dir = setup_test_directory();
+        let temp_path = temp_dir.path().to_string_lossy().to_string();
+
+        // Create command line arguments
+        let args = Args {
+            search: String::from("test_"),
+            replace: String::from("new_"),
+            directory: temp_path.clone(),
+            dry_run: false,
+        };
+
+        // Run the rename operation
+        let result = run_rename(&args);
+        assert!(result.is_ok());
+
+        // Verify files were renamed
+        assert!(!temp_dir.path().join("test_file1.txt").exists());
+        assert!(!temp_dir.path().join("test_file2.txt").exists());
+        assert!(temp_dir.path().join("new_file1.txt").exists());
+        assert!(temp_dir.path().join("new_file2.txt").exists());
+        assert!(temp_dir.path().join("other_file.txt").exists()); // Should remain unchanged
+    }
+
+    #[test]
+    fn test_invalid_regex_pattern() {
+        let temp_dir = setup_test_directory();
+        let temp_path = temp_dir.path().to_string_lossy().to_string();
+
+        // Create command line arguments with invalid regex
+        let args = Args {
+            search: String::from("[invalid regex"),
+            replace: String::from("new_"),
+            directory: temp_path,
+            dry_run: true,
+        };
+
+        let result = run_rename(&args);
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn test_nonexistent_directory() {
+        let args = Args {
+            search: String::from("test"),
+            replace: String::from("new"),
+            directory: String::from("/nonexistent/directory"),
+            dry_run: true,
+        };
+
+        let result = run_rename(&args);
+        assert!(result.is_err());
+    }
+}