ignore: improve 'excludesFile' parsing

This permits the value to be surrounded in double quotes. It's still not
perfect, but probably better than it was. Getting this to be more
correct will likely require writing (or using) a real parser, which I'm
not particularly incliend to do at present.

Fixes #2392, Closes #2629

crates/ignore/src/gitignore.rs

@@ -605,7 +605,7 @@ fn parse_excludes_file(data: &[u8]) -> Option<PathBuf> {
         Regex::builder()
             .configure(Regex::config().utf8_empty(false))
             .syntax(syntax::Config::new().utf8(false))
-            .build(r"(?im-u)^\s*excludesfile\s*=\s*(\S+)\s*$")
+            .build(r#"(?im-u)^\s*excludesfile\s*=\s*"?\s*(\S+?)\s*"?\s*$"#)
             .unwrap()
     });
     // We don't care about amortizing allocs here I think. This should only
@@ -772,6 +772,22 @@ mod tests {
         assert!(super::parse_excludes_file(&data).is_none());
     }
 
+    #[test]
+    fn parse_excludes_file4() {
+        let data = bytes("[core]\nexcludesFile = \"~/foo/bar\"");
+        let got = super::parse_excludes_file(&data);
+        assert_eq!(
+            path_string(got.unwrap()),
+            super::expand_tilde("~/foo/bar")
+        );
+    }
+
+    #[test]
+    fn parse_excludes_file5() {
+        let data = bytes("[core]\nexcludesFile = \" \"~/foo/bar \" \"");
+        assert!(super::parse_excludes_file(&data).is_none());
+    }
+
     // See: https://github.com/BurntSushi/ripgrep/issues/106
     #[test]
     fn regression_106() {