rusty-tags 0.3.0

Create tags for a cargo project and all of its dependencies
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use std::fs::{self, PathExt};
use std::env;
use std::path::PathBuf;
use glob::{glob, Paths};

use app_result::{AppResult, app_err};

/// where `rusty-tags` caches its tag files
pub fn rusty_tags_cache_dir() -> AppResult<PathBuf>
{
   let dir = try!(
      rusty_tags_dir().map(|mut d| {
         d.push("cache");
         d
      })
   );

   if ! dir.is_dir() {
      try!(fs::create_dir_all(&dir));
   }

   Ok(dir)
}

/// where rusty-tags puts all of its stuff
pub fn rusty_tags_dir() -> AppResult<PathBuf>
{
   let dir = try!(
      homedir().map(|mut d| {
         d.push(".rusty-tags");
         d 
      })
   );

   if ! dir.is_dir() {
      try!(fs::create_dir_all(&dir));
   }

   Ok(dir)
}

/// where cargo puts its git checkouts
pub fn cargo_git_src_dir() -> AppResult<PathBuf>
{
   cargo_dir().map(|mut d| {
      d.push("git");
      d.push("checkouts");
      d
   })
}

/// where cargo puts the source code of crates.io
pub fn cargo_crates_io_src_dir() -> AppResult<PathBuf>
{
   let src_dir = try!(
      cargo_dir().map(|mut d| {
         d.push("registry");
         d.push("src");
         d.push("github.com-*");
         d
      })
   );

   let src_str = format!("{}", src_dir.display());
   let mut paths = try!(glob_path(&src_str));
   if let Some(Ok(path)) = paths.nth(0) {
      Ok(PathBuf::new(&format!("{}", path.display())))
   }
   else {
      Err(app_err(format!("Expected one matching path for '{}'!", src_str)))
   }
}

/// where cargo puts all of its stuff
fn cargo_dir() -> AppResult<PathBuf>
{
   homedir().map(|mut d| { d.push(".cargo"); d })
}

pub fn glob_path(pattern: &String) -> AppResult<Paths>
{
   Ok(try!(glob(&pattern)))
}

fn homedir() -> AppResult<PathBuf>
{
   if let Some(path) = env::home_dir() {
      Ok(PathBuf::new(&format!("{}", path.display())))
   }
   else {
      Err(app_err("Couldn't read home directory!".to_string()))
   }
}