First, relatively simple implementation.

7 months ago · 63911fd15d
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,240 @@
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--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ name = "recursive-execute"
 description = "Execute a command in specified directories recursively."
 version = "0.1.0"
 authors = ["Bauke <me@bauke.xyz>"]
 license = "MIT/Apache-2.0"
 license = "MIT OR Apache-2.0"
 repository = "https://git.holllo.cc/Bauke/recursive-execute"
 edition = "2018"

@@ -14,3 +14,6 @@ name = "recursive-execute"
 path = "source/main.rs"

 [dependencies]
 clap = "2.33.1"
 execute = "0.2.8"
 walkdir = "2.3.1"
--- a/README.md
+++ b/README.md
@@ -26,6 +26,35 @@ chmod +x ./recursive-execute
 ./recursive-execute --help
 ```

 <details>
 <summary>Example output using <code>pwd</code>.</summary>

 ```sh
 $ ./recursive-execute -d="source/" -d="target/" -c="pwd" --depth="1" --verbose
 ```

 Outputs:

 ```
 Executing "pwd" in "source/" (current depth 0), output:
 /home/bauke/code/recursive-execute/source

 Executing "pwd" in "target/" (current depth 0), output:
 /home/bauke/code/recursive-execute/target

 Executing "pwd" in "target/debug" (current depth 1), output:
 /home/bauke/code/recursive-execute/target/debug

 Executing "pwd" in "target/release" (current depth 1), output:
 /home/bauke/code/recursive-execute/target/release

 Executing "pwd" in "target/rls" (current depth 1), output:
 /home/bauke/code/recursive-execute/target/rls

 ✓ Done!
 ```
 </details>

 ## License

 Open-sourced with either the
--- a/source/main.rs
+++ b/source/main.rs
@@ -1,3 +1,144 @@
 // Standard library modules.
 use std::process::Stdio;

 // Third-party modules.
 use clap::{
  crate_authors, crate_description, crate_name, crate_version, App, Arg,
 };
 use execute::command;
 use walkdir::WalkDir;

 fn main() {
  println!("recursive-execute");
  // Define the default CLI values here.
  let default_depth = "0";

  // Create the CLI with all possible flags and options.
  let cli = App::new(crate_name!())
    .about(crate_description!())
    .author(crate_authors!())
    .version(crate_version!())
    .args(&[
      // Boolean flags.
      Arg::with_name("verbose")
        .long("verbose")
        .long_help("Print extra information while running.")
        .takes_value(false),
      // Options that are only allowed once.
      Arg::with_name("command")
        .long("command")
        .long_help("The command to execute in each directory.")
        .short("c")
        .required(true)
        .takes_value(true),
      Arg::with_name("depth")
        .default_value(default_depth)
        .long("depth")
        .long_help(
          "How many directories deep we should go.\nUse -1 for unlimited depth.",
        )
        .takes_value(true),
      // Options that are allowed multiple times.
      Arg::with_name("directory")
        .long("dir")
        .long_help("One or more directories to execute the command in.")
        .multiple(true)
        .short("d")
        .required(true)
        .takes_value(true),
    ])
    .get_matches();

  // Extract boolean flags.
  let verbose = cli.is_present("verbose");

  // Extract the command to execute.
  let target_command = cli
    .value_of("command")
    .expect("Failed to extract the command to execute from the CLI");

  // Extract the target directories.
  let dirs = cli
    .values_of("directory")
    .expect("Failed to extract the target directories from the CLI");

  // Extract the maximum depth we want to walk.
  let depth = cli.value_of("depth").unwrap_or(default_depth);

  // If -1 is specified, don't bother parsing to a usize.
  let infinite_depth = depth == "-1";
  let depth = if infinite_depth {
    0_usize
  } else {
    depth
      .parse::<usize>()
      .expect("Failed to convert --depth to a usize")
  };

  for dir_root in dirs {
    // Create the walker for the specified directory.
    let walker = if infinite_depth {
      // If infinite depth was specified, don't call `max_depth()`, by default
      // WalkDir has no maximum depth.
      WalkDir::new(dir_root)
    } else {
      WalkDir::new(dir_root).max_depth(depth)
    };

    'walker_loop: for dir in walker {
      // Get the current path and depth.
      let dir = dir.unwrap();
      let current_depth = dir.depth();

      // If the current path isn't a directory, skip it.
      let dir_path = dir.path();
      if !dir_path.is_dir() {
        continue 'walker_loop;
      }

      // Print what we're doing and where we are.
      print!(
        "Executing \"{}\" in {:?} (current depth {})",
        target_command, dir_path, current_depth
      );

      // If verbose was specified, we're also going to print the output.
      if verbose {
        println!(", output:");
      } else {
        println!();
      }

      // Don't output the command output to stdout if `--verbose` isn't specified.
      let target_stdout = if verbose {
        Stdio::inherit()
      } else {
        Stdio::null()
      };

      // Spawn the command at the directory with the specified stdout.
      // Print an error and continue if one occurs.
      let mut child = match command(target_command)
        .stdout(target_stdout)
        .current_dir(dir_path)
        .spawn()
      {
        Ok(value) => value,
        Err(err) => {
          println!("Error executing command: {}", err);
          println!();
          continue 'walker_loop;
        }
      };

      // Wait for the command to finish before continuing.
      child.wait().expect("Failed to wait for child process");

      // If verbose was specified, print an extra newline to make the output more readable.
      if verbose {
        println!();
      }
    }
  }

  println!("✓ Done!");
 }