Fix ignores when searching subdirectories

When searching subdirectories the path was not correctly build and
included duplicate parts. This fix will remove the duplicate part if
possible. It also contains a small optimization that will skip the
second for loop if there is already a match.

Fixes BurntSushi#1757

crates/ignore/src/dir.rs

@@ -440,9 +440,25 @@ impl Ignore {
             }
             saw_git = saw_git || ig.0.has_git;
         }
-        if self.0.opts.parents {
+        if self.0.opts.parents
+            && m_custom_ignore.is_none()
+            && m_ignore.is_none()
+            && m_gi.is_none()
+            && m_gi_exclude.is_none()
+        {
             if let Some(abs_parent_path) = self.absolute_base() {
-                let path = abs_parent_path.join(path);
+                let path_prefix = match self.0.dir.as_path().strip_prefix("./")
+                {
+                    Ok(stripped_dot_slash) => stripped_dot_slash,
+                    Err(_) => self.0.dir.as_path(),
+                };
+                let path = match path.strip_prefix(path_prefix) {
+                    Ok(stripped_path_prefix) => {
+                        abs_parent_path.join(stripped_path_prefix)
+                    }
+                    Err(_) => abs_parent_path.join(path),
+                };
+
                 for ig in
                     self.parents().skip_while(|ig| !ig.0.is_absolute_parent)
                 {

tests/regression.rs

@@ -1126,3 +1126,16 @@ rgtest!(r2236, |dir: Dir, mut cmd: TestCommand| {
     dir.create("foo/bar", "test\n");
     cmd.args(&["test"]).assert_err();
 });
+
+// See: https://github.com/BurntSushi/ripgrep/issues/1757
+rgtest!(f1757, |dir: Dir, _: TestCommand| {
+    dir.create_dir("rust/target");
+    dir.create(".ignore", "rust/target");
+    dir.create("rust/source.rs", "needle");
+    dir.create("rust/target/rustdoc-output.html", "needle");
+
+    let args = &["--files-with-matches", "needle", "rust"];
+    eqnice!("rust/source.rs\n", dir.command().args(args).stdout());
+    let args = &["--files-with-matches", "needle", "./rust"];
+    eqnice!("./rust/source.rs\n", dir.command().args(args).stdout());
+});