Permit whitelisting hidden files in ignores.

Fixes #90

src/gitignore.rs

@@ -31,7 +31,7 @@ use std::path::{Path, PathBuf};
 use regex;
 
 use glob;
-use pathutil::strip_prefix;
+use pathutil::{is_file_name, strip_prefix};
 
 /// Represents an error that can occur when parsing a gitignore file.
 #[derive(Debug)]
@@ -115,8 +115,15 @@ impl Gitignore {
         if let Some(p) = strip_prefix("./", path) {
             path = p;
         }
-        if let Some(p) = strip_prefix(&self.root, path) {
-            path = p;
+        // Strip any common prefix between the candidate path and the root
+        // of the gitignore, to make sure we get relative matching right.
+        // BUT, a file name might not have any directory components to it,
+        // in which case, we don't want to accidentally strip any part of the
+        // file name.
+        if !is_file_name(path) {
+            if let Some(p) = strip_prefix(&self.root, path) {
+                path = p;
+            }
         }
         if let Some(p) = strip_prefix("/", path) {
             path = p;

src/ignore.rs

@@ -227,16 +227,10 @@ impl Ignore {
         if let Some(is_ignored) = self.ignore_match(path, mat) {
             return is_ignored;
         }
-        if self.ignore_hidden && is_hidden(&path) {
-            debug!("{} ignored because it is hidden", path.display());
-            return true;
-        }
+        let mut whitelisted = false;
         if !self.no_ignore {
-            let mut whitelisted = false;
             for id in self.stack.iter().rev() {
                 let mat = id.matched(path, is_dir);
-                // println!("path: {}, mat: {:?}, id: {:?}",
-                         // path.display(), mat, id);
                 if let Some(is_ignored) = self.ignore_match(path, mat) {
                     if is_ignored {
                         return true;
@@ -264,6 +258,7 @@ impl Ignore {
                         // If this path is whitelisted by an ignore, then
                         // fallthrough and let the file type matcher have a
                         // say.
+                        whitelisted = true;
                         break;
                     }
                 }
@@ -271,7 +266,14 @@ impl Ignore {
         }
         let mat = self.types.matched(path, is_dir);
         if let Some(is_ignored) = self.ignore_match(path, mat) {
-            return is_ignored;
+            if is_ignored {
+                return true;
+            }
+            whitelisted = true;
+        }
+        if !whitelisted && self.ignore_hidden && is_hidden(&path) {
+            debug!("{} ignored because it is hidden", path.display());
+            return true;
         }
         false
     }

src/pathutil.rs

@@ -98,3 +98,21 @@ pub fn is_hidden<P: AsRef<Path>>(path: P) -> bool {
         false
     }
 }
+
+/// Returns true if this file path is just a file name. i.e., Its parent is
+/// the empty string.
+#[cfg(unix)]
+pub fn is_file_name<P: AsRef<Path>>(path: P) -> bool {
+    use std::os::unix::ffi::OsStrExt;
+    use memchr::memchr;
+
+    let path = path.as_ref().as_os_str().as_bytes();
+    memchr(b'/', path).is_none()
+}
+
+/// Returns true if this file path is just a file name. i.e., Its parent is
+/// the empty string.
+#[cfg(not(unix))]
+pub fn is_file_name<P: AsRef<Path>>(path: P) -> bool {
+    path.as_ref().parent().map(|p| p.is_empty()).unwrap_or(false)
+}

tests/tests.rs

@@ -694,6 +694,15 @@ clean!(regression_67, "test", ".", |wd: WorkDir, mut cmd: Command| {
     assert_eq!(lines, path("dir/bar:test\n"));
 });
 
+// See: https://github.com/BurntSushi/ripgrep/issues/90
+clean!(regression_90, "test", ".", |wd: WorkDir, mut cmd: Command| {
+    wd.create(".gitignore", "!.foo");
+    wd.create(".foo", "test");
+
+    let lines: String = wd.stdout(&mut cmd);
+    assert_eq!(lines, ".foo:test\n");
+});
+
 // See: https://github.com/BurntSushi/ripgrep/issues/20
 sherlock!(feature_20, "Sherlock", ".", |wd: WorkDir, mut cmd: Command| {
     cmd.arg("--no-filename");