init commit

.gitignore

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+target
+Cargo.lock

Cargo.toml

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+[package]
+name = "which"
+version = "0.1.0"
+authors = ["fangyuanziti <tiziyuanfang@gmail.com>"]
+repository = "https://github.com/fangyuanziti/which-rs.git"
+documentation = "http://fangyuanziti.github.io/which-rs/which/"
+license = "MIT"
+description= "A Rust equivalent of Unix command \"which\"."

LICENSE.txt

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+Copyright (c) 2015 fangyuanziti
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# which
+
+A Rust equivalent of Unix command "which".
+
+## Exmaple
+
+To find wihch rustc exectable binary is using.
+
+``` rust
+use which::which;
+
+let result = which::which("rustc").unwrap();
+assert_eq!(result, PathBuf::from("/usr/bin/rustc"));
+
+```
+
+## Documentation
+
+The documentation is [available online](http://fangyuanziti.github.io/which-rs/which/).

src/lib.rs

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+//! which
+//!
+//! A Rust equivalent of Unix command "which".
+//! # Exmaple:
+//!
+//! To find wihch rustc exectable binary is using.
+//!
+//! ``` norun
+//! use which::which;
+//!
+//! let result = which::which("rustc").unwrap();
+//! assert_eq!(result, PathBuf::from("/usr/bin/rustc"));
+//!
+//! ```
+
+use std::path::PathBuf;
+use std::{env, fs};
+
+fn is_exist(bin_path: &PathBuf) -> bool {
+
+    match fs::metadata(bin_path).map(|metadata|{
+        metadata.is_file()
+    }) {
+        Ok(true) => true,
+        _ => false
+    }
+}
+
+
+/// Find a exectable binary's path by name.
+///
+/// # Example
+///
+/// ``` norun
+/// use which::which;
+/// use std::path::PathBuf;
+///
+/// let result = which::which("rustc").unwrap();
+/// assert_eq!(result, PathBuf::from("/usr/bin/rustc"));
+///
+/// ```
+pub fn which(binary_name: &'static str)
+             -> Result<PathBuf, &'static str> {
+
+    let path_buf = env::var_os("PATH").and_then(
+        |paths| -> Option<PathBuf> {
+            for path in env::split_paths(&paths) {
+                let bin_path = path.join(binary_name);
+                if is_exist(&bin_path) {
+                    return Some(bin_path);
+                }
+            }
+            return None;
+
+        });
+
+    match path_buf {
+        Some(path) => Ok(path),
+        None => Err("Can not find binary path")
+    }
+
+}
+
+
+#[test]
+fn it_works() {
+    use std::process::Command;
+    let result = which("rustc");
+    assert!(result.is_ok());
+
+    let which_result = Command::new("which")
+        .arg("rustc")
+        .output();
+
+    assert_eq!(String::from(result.unwrap().to_str().unwrap()),
+        String::from_utf8(which_result.unwrap().stdout).unwrap().trim());
+}
+
+#[test]
+fn dont_works() {
+    let result = which("cargo-no-exist");
+    assert_eq!(result, Err("Can not find binary path"))
+}