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#![deny(warnings, missing_docs)]

//! mkdir -p

use std::fs;
use std::io;
use std::path::{Path, PathBuf};

/// Create a new directory, ignore if it already exists.
///
/// Returns the first created directory if some of the
/// paths already existed, `None` if no new directories
/// were created.
pub fn mkdirp<P: AsRef<Path>>(path: P) -> io::Result<Option<PathBuf>> {
  let path = path.as_ref();
  if path == Path::new("") {
    return Ok(None);
  }

  match fs::create_dir(path) {
    Ok(()) => return Ok(Some(path.to_owned())),
    Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
    Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => return Ok(None),
    Err(_) if path.is_dir() => return Ok(None),
    Err(e) => return Err(e),
  }
  let created = match path.parent() {
    Some(p) => mkdirp(p),
    None => {
      return Err(io::Error::new(
        io::ErrorKind::Other,
        "failed to create whole tree",
      ))
    }
  };
  match fs::create_dir(path) {
    Ok(()) => created,
    Err(_) if path.is_dir() => created,
    Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => created,
    Err(e) => Err(e),
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  #[test]
  fn return_dir() {
    let mut dir = std::env::temp_dir();
    dir.push("mkdirp-test");
    let test_path = dir.clone();
    fs::remove_dir_all(&test_path).ok();
    fs::create_dir(&test_path).unwrap();
    dir.push("nested-1");
    let expected = dir.clone();
    dir.push("nested-2");
    dir.push("nested-3");
    let ret = mkdirp(dir.as_path()).unwrap().unwrap();
    fs::remove_dir_all(test_path).unwrap();
    assert_eq!(ret, expected);
  }

  #[test]
  fn noop() {
    let dir = std::env::temp_dir();
    let ret = mkdirp(dir.as_path()).unwrap();
    assert_eq!(ret, None);
  }
}