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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.use std;use std::fs::{create_dir, DirBuilder, File, OpenOptions};use std::io::ErrorKind;use std::io::Write;use std::path::{Path, PathBuf};
use rand;use rand::Rng;
#[cfg(any(unix))]use std::os::unix::fs::DirBuilderExt;#[cfg(any(unix))]use std::os::unix::fs::PermissionsExt;
pub fn write_file<T: AsRef<[u8]>>(  filename: &Path,  data: T,  perm: u32,) -> std::io::Result<()> {  let is_append = perm & (1 << 31) != 0;  let mut file = OpenOptions::new()    .read(false)    .write(true)    .append(is_append)    .truncate(!is_append)    .create(true)    .open(filename)?;
  set_permissions(&mut file, perm)?;  file.write_all(data.as_ref())}
#[cfg(any(unix))]fn set_permissions(file: &mut File, perm: u32) -> std::io::Result<()> {  debug!("set file perm to {}", perm);  file.set_permissions(PermissionsExt::from_mode(perm & 0o777))}#[cfg(not(any(unix)))]fn set_permissions(_file: &mut File, _perm: u32) -> std::io::Result<()> {  // NOOP on windows  Ok(())}
pub fn make_temp_dir(  dir: Option<&Path>,  prefix: Option<&str>,  suffix: Option<&str>,) -> std::io::Result<PathBuf> {  let prefix_ = prefix.unwrap_or("");  let suffix_ = suffix.unwrap_or("");  let mut buf: PathBuf = match dir {    Some(ref p) => p.to_path_buf(),    None => std::env::temp_dir(),  }.join("_");  let mut rng = rand::thread_rng();  loop {    let unique = rng.gen::<u32>();    buf.set_file_name(format!("{}{:08x}{}", prefix_, unique, suffix_));    // TODO: on posix, set mode flags to 0o700.    let r = create_dir(buf.as_path());    match r {      Err(ref e) if e.kind() == ErrorKind::AlreadyExists => continue,      Ok(_) => return Ok(buf),      Err(e) => return Err(e),    }  }}
pub fn mkdir(path: &Path, perm: u32, recursive: bool) -> std::io::Result<()> {  debug!("mkdir -p {}", path.display());  let mut builder = DirBuilder::new();  builder.recursive(recursive);  set_dir_permission(&mut builder, perm);  builder.create(path)}
#[cfg(any(unix))]fn set_dir_permission(builder: &mut DirBuilder, perm: u32) {  debug!("set dir perm to {}", perm);  builder.mode(perm & 0o777);}
#[cfg(not(any(unix)))]fn set_dir_permission(_builder: &mut DirBuilder, _perm: u32) {  // NOOP on windows}
pub fn normalize_path(path: &Path) -> String {  let s = String::from(path.to_str().unwrap());  if cfg!(windows) {    // TODO This isn't correct. Probbly should iterate over components.    s.replace("\\", "/")  } else {    s  }}