Add basic gitignore functionality

No support for wildcards and exact matches might screw up nested
directories. The Globbing functionality seems like its going to be a
pain to properly match up.

.gitignore

@@ -1 +1,2 @@
+# comment
 /target

src/config.rs

@@ -6,6 +6,7 @@ pub struct Config {
     pub pattern: String,
     pub ignore_case: bool,
     pub path: String,
+    pub use_gitignore: bool,
 }
 
 impl Config {
@@ -28,7 +29,12 @@ impl Config {
                 Arg::with_name("path")
                     .help("Path to search in")
                     .index(2)
-                    .default_value("."),
+                    .default_value(""),
+            )
+            .arg(
+                Arg::with_name("gitignore")
+                    .long("no-gitignore")
+                    .help("Include results that are specified in .gitignore"),
             )
             .get_matches();
 
@@ -36,6 +42,7 @@ impl Config {
             pattern: String::from(matches.value_of("pattern").unwrap()),
             ignore_case: matches.is_present("ignore case"),
             path: String::from(matches.value_of("path").unwrap()),
+            use_gitignore: !matches.is_present("gitignore"),
         }
     }
 }

src/main.rs

@@ -1,6 +1,6 @@
 use rack::config::Config;
 use rack::filematch::*;
-use std::fs::{self, File};
+use std::fs::{self, DirEntry, File};
 use std::io;
 use std::io::prelude::*;
 use std::path::Path;
@@ -19,7 +19,9 @@ fn main() {
         }
     };
 
-    let results = traverse_dir(&config, path, |config, path| check_file(config, path));
+    let results = traverse_dir(&config, path, Option::None, |config, path| {
+        check_file(config, path)
+    });
     match results {
         Result::Ok(matches) if matches.len() == 0 => println!("No matches :("),
         Result::Ok(matches) => print_report(&config, &matches),
@@ -30,15 +32,46 @@ fn main() {
 fn traverse_dir(
     config: &Config,
     dir: &Path,
+    gitignore_entries: Option<Vec<String>>,
     operation: fn(&Config, &Path) -> io::Result<FileMatch>,
 ) -> io::Result<Vec<FileMatch>> {
     let mut matches: Vec<FileMatch> = Vec::new();
-    for entry in fs::read_dir(dir)? {
+    let entries = fs::read_dir(dir)?.collect::<Vec<io::Result<DirEntry>>>();
+
+    let gitignore: Option<&DirEntry> = entries
+        .iter()
+        .filter_map(|entry| entry.as_ref().ok())
+        .find(|entry| entry.path().file_name().unwrap() == ".gitignore");
+
+    let gitignore = match gitignore {
+        Some(g) => {
+            let file = io::BufReader::new(File::open(g.path())?);
+            file.lines()
+                .map(|line| line.unwrap().trim().to_owned())
+                .filter(|line| line.len() > 0 && !line.starts_with('#'))
+                .collect::<Vec<String>>()
+        }
+        None => gitignore_entries.unwrap_or(Vec::new()),
+    };
+
+    for entry in entries {
         let entry = entry?;
         let file_type = entry.file_type()?;
-
+        let path = entry.path().to_str().unwrap().to_owned();
         if file_type.is_dir() {
-            let mut results = traverse_dir(&config, &entry.path(), operation)?;
+            if config.use_gitignore {
+                let should_ignore = gitignore.iter().find(|&line| path.contains(&line.clone()));
+
+                if should_ignore.unwrap_or(&String::from("")).len() > 0
+                    || entry.path().to_str().unwrap().contains("/.git")
+                {
+                    continue;
+                }
+            }
+
+            // TODO: Should borrow gitignore instead of cloning..
+            let mut results =
+                traverse_dir(&config, &entry.path(), Some(gitignore.clone()), operation)?;
             let has_results = results
                 .iter()
                 .filter({ |mat| mat.matches.len() > 0 })
@@ -49,6 +82,15 @@ fn traverse_dir(
                 matches.append(&mut results);
             }
         } else {
+            if config.use_gitignore {
+                let should_ignore = gitignore.iter().find(|&line| path.contains(&line.clone()));
+
+                if should_ignore.unwrap_or(&String::from("")).len() > 0
+                    || entry.path().to_str().unwrap().contains("/.git")
+                {
+                    continue;
+                }
+            }
             let result = operation(&config, &entry.path());
             match result {
                 Result::Ok(result) if result.matches.len() > 0 => matches.push(result),

src/printer.rs

@@ -12,9 +12,9 @@ pub struct ColorPrinter<'a> {
     pub file_match: &'a FileMatch,
 }
 
-struct SimplePrinter<'a> {
-    config: &'a Config,
-    file_match: &'a FileMatch,
+pub struct SimplePrinter<'a> {
+    pub config: &'a Config,
+    pub file_match: &'a FileMatch,
 }
 
 impl<'a> Printer for SimplePrinter<'a> {
@@ -71,6 +71,7 @@ impl<'a> Printer for ColorPrinter<'a> {
         };
 
         let mut term = term::stdout().unwrap();
+
         term.fg(term::color::YELLOW).unwrap();
         term.attr(term::Attr::Bold).unwrap();
         simple_printer.print_file_name();