(#7) Refactor Worktree Selector to use Git's built-in commands

Merge pull request #7 from lu0/refactor-worktree-selector

select-airflow-worktree.sh

@@ -25,34 +25,25 @@ select-airflow-worktree() {
         /usr/bin/env git "$@"
     }
 
-    # $GIT_DIR is not the root directory of a bare repository.
-    # Next command extracts it on both "normal" and bare repositories.
-    # DOES NOT SUPPORT SPACES IN NAME OF BRANCHES/WORKTREES/DIRECTORIES.
-    git_dir=$(head -n 1 < <(git worktree list) | cut -d" " -f1)
-
-    # Returns true or false
     is_bare_repo=$(git config --get core.bare)
 
     if [ "${was_branch_checkout}" = 1 ]; then
 
         if [ "${is_bare_repo}" == false ]; then
             info "Not a bare repo, skipping airflow-worktree"
         else
-            # Information of the worktree we are in
-            worktree_info=$(git worktree list | grep "$PWD " | xargs)
-
-            # DOES NOT SUPPORT SPACES IN NAME OF BRANCHES/WORKTREES/DIRECTORIES.
-            worktree_abs_path=$(echo "${worktree_info}" | cut -d" " -f1)
-
-            # Path to the workspace relative to the repository's root directory
-            worktree_rel_path="${worktree_abs_path##"${git_dir}"/}"
-
-            # Ignore all directories except root and worktree
-            /usr/bin/env find "${git_dir}" -maxdepth 1 -type d \
-                -not -path "${git_dir}" \
-                -not -path "${worktree_abs_path}" \
-                -printf '^%P/\n' | sort \
-                > "${git_dir}/.airflowignore"
+            git_root_dir=$(git rev-parse --git-common-dir)
+            worktree_abs_path=$(git rev-parse --show-toplevel)
+            worktree_rel_path="${worktree_abs_path##"${git_root_dir}"/}"
+
+                        (
+                git worktree list |
+                    awk '{print $1}' |                   # Use the first column (worktree paths)
+                    grep -vE "^${git_root_dir}$" |            # Exclude the git's root dir
+                    grep -vE "^${worktree_abs_path}$" |  # Exclude the current worktree
+                    sed "s|${git_root_dir}/||g" |             # Convert worktrees to paths relative to the git's root dir
+                    sed 's/.*/^&\//'                     # Append ^ at start and / at end to ignore directory matches
+            ) > "${git_root_dir}/.airflowignore"
 
             info ".airflowignore updated to load DAGs from ${worktree_rel_path}"
         fi