Preliminary Git support!

This is something that I've long wanted to add. It uses libgit2 as an optional dependency.

Cargo.lock

@@ -4,6 +4,7 @@ version = "0.1.0"
 dependencies = [
  "ansi_term 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "git2 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "natord 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "number_prefix 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "users 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -18,11 +19,68 @@ dependencies = [
  "regex_macros 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "bitflags"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "getopts"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "git2"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libgit2-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libgit2-sys"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libssh2-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libz-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libressl-pnacl-sys"
+version = "2.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pnacl-build-helper 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libssh2-sys"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libz-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libz-sys"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "pkg-config 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "matches"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "natord"
 version = "1.0.6"
@@ -33,6 +91,25 @@ name = "number_prefix"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "openssl-sys"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libressl-pnacl-sys 2.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "pkg-config"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "pnacl-build-helper"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "regex"
 version = "0.1.10"
@@ -46,6 +123,20 @@ dependencies = [
  "regex 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rustc-serialize"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "url"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "users"
 version = "0.2.1"

Cargo.toml

@@ -12,3 +12,10 @@ getopts = "0.1.4"
 natord = "1.0.6"
 number_prefix = "0.2.1"
 users = "0.2.1"
+
+[features]
+git = [ "git2" ]
+
+[dependencies.git2]
+version = "0.1.12"
+optional = true

src/column.rs

@@ -12,6 +12,8 @@ pub enum Column {
     Group,
     HardLinks,
     Inode,
+
+    GitStatus,
 }
 
 #[derive(PartialEq, Debug, Copy)]
@@ -37,6 +39,7 @@ impl Column {
             Column::HardLinks   => Alignment::Right,
             Column::Inode       => Alignment::Right,
             Column::Blocks      => Alignment::Right,
+            Column::GitStatus   => Alignment::Right,
             _                   => Alignment::Left,
         }
     }
@@ -53,6 +56,7 @@ impl Column {
             Column::Group       => "Group",
             Column::HardLinks   => "Links",
             Column::Inode       => "inode",
+            Column::GitStatus   => "Git",
         }
     }
 }

src/dir.rs

@@ -1,5 +1,9 @@
 use std::io::{fs, IoResult};
-use file::File;
+use file::{File, GREY};
+
+#[cfg(feature="git")] use ansi_term::ANSIString;
+#[cfg(feature="git")] use ansi_term::Colour::*;
+#[cfg(feature="git")] use git2;
 
 /// A **Dir** provides a cached list of the file paths in a directory that's
 /// being listed.
@@ -10,6 +14,7 @@ use file::File;
 pub struct Dir {
     contents: Vec<Path>,
     path: Path,
+    git: Option<Git>,
 }
 
 impl Dir {
@@ -20,6 +25,7 @@ impl Dir {
         fs::readdir(&path).map(|paths| Dir {
             contents: paths,
             path: path.clone(),
+            git: Git::new(&path).ok(),
         })
     }
 
@@ -47,4 +53,79 @@ impl Dir {
     pub fn join(&self, child: Path) -> Path {
         self.path.join(child)
     }
+
+    /// Return whether there's a Git repository on or above this directory.
+    pub fn has_git_repo(&self) -> bool {
+        self.git.is_some()
+    }
+
+    /// Get a string describing the Git status of the given file.
+    pub fn git_status(&self, path: &Path) -> String {
+        match self.git {
+            Some(ref git) => git.status(path),
+            None => GREY.paint("--").to_string(),
+        }
+    }
+}
+
+#[cfg(feature="git")]
+struct Git {
+    statuses: Vec<(String, git2::Status)>,
+}
+
+#[cfg(feature="git")]
+impl Git {
+    fn new(path: &Path) -> Result<Git, git2::Error> {
+        let repo = try!(git2::Repository::discover(path));
+        let statuses = try!(repo.statuses(None));
+
+        Ok(Git { statuses: statuses.iter().map(|e| (e.path().unwrap().to_string(), e.status())).collect() })
+    }
+
+    /// Get the status for the file at the given path, if present.
+    fn status(&self, path: &Path) -> String {
+        match self.statuses.iter().find(|&&(ref p, _)| path.as_str().unwrap() == p.as_slice()) {
+            Some(&(_, s)) => format!("{}{}", Git::index_status(s), Git::working_tree_status(s)),
+            None => GREY.paint("--").to_string(),
+        }
+    }
+
+    /// The character to display if the file has been modified, but not staged.
+    fn working_tree_status(status: git2::Status) -> ANSIString<'static> {
+        match status {
+            s if s.contains(git2::STATUS_WT_NEW) => Green.paint("A"),
+            s if s.contains(git2::STATUS_WT_MODIFIED) => Blue.paint("M"),
+            s if s.contains(git2::STATUS_WT_DELETED) => Red.paint("D"),
+            s if s.contains(git2::STATUS_WT_RENAMED) => Yellow.paint("R"),
+            s if s.contains(git2::STATUS_WT_TYPECHANGE) => Purple.paint("T"),
+            _ => GREY.paint("-"),
+        }
+    }
+
+    /// The character to display if the file has been modified, and the change
+    /// has been staged.
+    fn index_status(status: git2::Status) -> ANSIString<'static> {
+        match status {
+            s if s.contains(git2::STATUS_INDEX_NEW) => Green.paint("A"),
+            s if s.contains(git2::STATUS_INDEX_MODIFIED) => Blue.paint("M"),
+            s if s.contains(git2::STATUS_INDEX_DELETED) => Red.paint("D"),
+            s if s.contains(git2::STATUS_INDEX_RENAMED) => Yellow.paint("R"),
+            s if s.contains(git2::STATUS_INDEX_TYPECHANGE) => Purple.paint("T"),
+            _ => GREY.paint("-"),
+        }
+    }
+}
+
+#[cfg(not(feature="git"))]
+struct Git;
+
+#[cfg(not(feature="git"))]
+impl Git {
+    fn new(_: &Path) -> Result<Git, ()> {
+        Err(())
+    }
+
+    fn status(&self, _: &Path) -> String {
+        panic!("Tried to access a Git repo without Git support!");
+    }
 }

src/file.rs

@@ -79,6 +79,7 @@ impl<'a> File<'a> {
             Blocks       => self.blocks(),
             User         => self.user(users_cache),
             Group        => self.group(users_cache),
+            GitStatus    => self.git_status(),
         }
     }
 
@@ -369,6 +370,11 @@ impl<'a> File<'a> {
             vec![]  // No source files if there's no extension, either!
         }
     }
+
+    fn git_status(&self) -> Cell {
+        let status = self.dir.map(|d| d.git_status(&self.path)).unwrap_or("NO".to_string());
+        Cell { text: status, length: 2 }
+    }
 }
 
 /// Extract an extension from a string, if one is present, in lowercase.

src/main.rs

@@ -5,6 +5,9 @@ extern crate number_prefix;
 extern crate unicode;
 extern crate users;
 
+#[cfg(feature="git")]
+extern crate git2;
+
 use std::io::FileType;
 use std::io::fs;
 use std::os::{args, set_exit_status};

src/options.rs

@@ -265,6 +265,7 @@ fn columns(matches: &getopts::Matches) -> Result<Vec<Column>, Misfire> {
         columns.push(Group);
     }
 
+    columns.push(GitStatus);
     columns.push(FileName);
     Ok(columns)
 }