get_git_root_path: support worktrees

Author: RickyDaMa

lib/fontv/utilities.py

@@ -44,8 +44,18 @@ def get_git_root_path(filepath):
 
     # search up to five directories above for the git repo root
     for _ in range(6):
-        if dir_exists(os.path.join(gitroot_path, ".git")):
+        dot_git = os.path.join(gitroot_path, ".git")
+        if dir_exists(dot_git):
             return gitroot_path
+        elif file_exists(dot_git):
+            # Could be a worktree, in which case .git is a file with content like:
+            # gitdir: /home/atk/Tools/font-v/.git/worktrees/work-worktrees-work
+            with open(dot_git, "r") as dot_git:
+                line = dot_git.readline()
+                # "gitdir: font-v/.git/worktrees/work-worktrees-work" -> "font-v/.git/worktrees/work-worktrees-work"
+                worktree_path = line.split(" ", 2)[1]
+                # "font-v/.git/worktrees/work-worktrees-work" -> "font-v/.git"
+                gitroot_path = worktree_path.split("/worktrees/", 2)[0]
         gitroot_path = os.path.dirname(gitroot_path)
 
     raise IOError(