chore: Implement handling of --ignore-older flag

Author: alerque

src/lib.rs

@@ -253,11 +253,16 @@ fn diff_affects_oid(diff: &Diff, oid: &Oid, touchable_path: &mut Utf8PathBuf) ->
     })
 }
 
-fn touch_if_time_mismatch(path: Utf8PathBuf, time: i64, verbose: bool) -> Result<bool> {
+fn touch_if_time_mismatch(
+    path: Utf8PathBuf,
+    time: i64,
+    verbose: bool,
+    ignore_older: bool,
+) -> Result<bool> {
     let commit_time = FileTime::from_unix_time(time, 0);
     let metadata = fs::metadata(&path).context(IoSnafu)?;
     let file_mtime = FileTime::from_last_modification_time(&metadata);
-    if file_mtime != commit_time {
+    if file_mtime > commit_time || (!ignore_older && file_mtime < commit_time) {
         filetime::set_file_mtime(&path, commit_time).context(IoSnafu)?;
         if verbose {
             println!("Rewound the clock: {path}");
@@ -313,9 +318,12 @@ fn process_touchables(repo: &Repository, touchables: FileSet, opts: &Options) ->
             let affected = diff_affects_oid(&diff, oid, touchable_path);
             if affected {
                 let time = commit.time().seconds();
-                if let Ok(true) =
-                    touch_if_time_mismatch(touchable_path.to_path_buf(), time, opts.verbose)
-                {
+                if let Ok(true) = touch_if_time_mismatch(
+                    touchable_path.to_path_buf(),
+                    time,
+                    opts.verbose,
+                    opts.ignore_older,
+                ) {
                     touched
                         .write()
                         .unwrap()