Fix a bug in the translation from a gitignore pattern to a glob.

We were erroneously neglecting to prefix a pattern like `foo/`
with `**/` (to make `**/foo/`) because it had a slash in it. In fact, the
only reason to neglect a **/ prefix is if the pattern already starts
with **/, or if the pattern is absolute.

Fixes BurntSushi#16, BurntSushi#49, BurntSushi#50, BurntSushi#65

src/gitignore.rs

@@ -284,6 +284,7 @@ impl GitignoreBuilder {
         };
         let mut opts = glob::MatchOptions::default();
         let has_slash = line.chars().any(|c| c == '/');
+        let is_absolute = line.chars().nth(0).unwrap() == '/';
         // If the line starts with an escaped '!', then remove the escape.
         // Otherwise, if it starts with an unescaped '!', then this is a
         // whitelist pattern.
@@ -320,14 +321,19 @@ impl GitignoreBuilder {
             }
         }
         // If there is a literal slash, then we note that so that globbing
-        // doesn't let wildcards match slashes. Otherwise, we need to let
-        // the pattern match anywhere, so we add a `**/` prefix to achieve
-        // that behavior.
+        // doesn't let wildcards match slashes.
         pat.pat = line.to_string();
         if has_slash {
             opts.require_literal_separator = true;
-        } else {
-            pat.pat = format!("**/{}", pat.pat);
+        }
+        // If there was no leading slash, then this is a pattern that must
+        // match the entire path name. Otherwise, we should let it match
+        // anywhere, so use a **/ prefix.
+        if !is_absolute {
+            // ... but only if we don't already have a **/ prefix.
+            if !pat.pat.starts_with("**/") {
+                pat.pat = format!("**/{}", pat.pat);
+            }
         }
         try!(self.builder.add_with(&pat.pat, &opts));
         self.patterns.push(pat);
@@ -393,10 +399,12 @@ mod tests {
     ignored!(ig24, ROOT, "target", "grep/target");
     ignored!(ig25, ROOT, "Cargo.lock", "./tabwriter-bin/Cargo.lock");
     ignored!(ig26, ROOT, "/foo/bar/baz", "./foo/bar/baz");
+    ignored!(ig27, ROOT, "foo/", "xyz/foo", true);
+    ignored!(ig28, ROOT, "src/*.rs", "src/grep/src/main.rs");
 
     not_ignored!(ignot1, ROOT, "amonths", "months");
     not_ignored!(ignot2, ROOT, "monthsa", "months");
-    not_ignored!(ignot3, ROOT, "src/*.rs", "src/grep/src/main.rs");
+    not_ignored!(ignot3, ROOT, "/src/*.rs", "src/grep/src/main.rs");
     not_ignored!(ignot4, ROOT, "/*.c", "mozilla-sha1/sha1.c");
     not_ignored!(ignot5, ROOT, "/src/*.rs", "src/grep/src/main.rs");
     not_ignored!(ignot6, ROOT, "*.rs\n!src/main.rs", "src/main.rs");

tests/tests.rs

@@ -34,6 +34,18 @@ macro_rules! sherlock {
     };
 }
 
+macro_rules! clean {
+    ($name:ident, $query:expr, $path:expr, $fun:expr) => {
+        #[test]
+        fn $name() {
+            let wd = WorkDir::new(stringify!($name));
+            let mut cmd = wd.command();
+            cmd.arg($query).arg($path);
+            $fun(wd, cmd);
+        }
+    };
+}
+
 sherlock!(single_file, |wd: WorkDir, mut cmd| {
     let lines: String = wd.stdout(&mut cmd);
     let expected = "\
@@ -587,6 +599,43 @@ sherlock:5:12:but Doctor Watson has to have it taken out for him and dusted,
     assert_eq!(lines, expected);
 });
 
+// See: https://github.com/BurntSushi/ripgrep/issues/16
+clean!(regression_16, "xyz", ".", |wd: WorkDir, mut cmd: Command| {
+    wd.create(".gitignore", "ghi/");
+    wd.create_dir("ghi");
+    wd.create_dir("def/ghi");
+    wd.create("ghi/toplevel.txt", "xyz");
+    wd.create("def/ghi/subdir.txt", "xyz");
+    wd.assert_err(&mut cmd);
+});
+
+// See: https://github.com/BurntSushi/ripgrep/issues/49
+clean!(regression_49, "xyz", ".", |wd: WorkDir, mut cmd: Command| {
+    wd.create(".gitignore", "foo/bar");
+    wd.create_dir("test/foo/bar");
+    wd.create("test/foo/bar/baz", "test");
+    wd.assert_err(&mut cmd);
+});
+
+// See: https://github.com/BurntSushi/ripgrep/issues/50
+clean!(regression_50, "xyz", ".", |wd: WorkDir, mut cmd: Command| {
+    wd.create(".gitignore", "XXX/YYY/");
+    wd.create_dir("abc/def/XXX/YYY");
+    wd.create_dir("ghi/XXX/YYY");
+    wd.create("abc/def/XXX/YYY/bar", "test");
+    wd.create("ghi/XXX/YYY/bar", "test");
+    wd.assert_err(&mut cmd);
+});
+
+// See: https://github.com/BurntSushi/ripgrep/issues/65
+clean!(regression_65, "xyz", ".", |wd: WorkDir, mut cmd: Command| {
+    wd.create(".gitignore", "a/");
+    wd.create_dir("a");
+    wd.create("a/foo", "xyz");
+    wd.create("a/bar", "xyz");
+    wd.assert_err(&mut cmd);
+});
+
 #[test]
 fn binary_nosearch() {
     let wd = WorkDir::new("binary_nosearch");