new git working strategy, using worktrees now for easier parallel development

common/general/shell/branchd.func.sh

@@ -0,0 +1,55 @@
+branchdel() {
+  # branchd — remove current branch worktree (function form)
+  local wt_path
+  wt_path=$(pwd)
+  local common_dir repo_dir
+  if ! common_dir=$(git rev-parse --git-common-dir 2>/dev/null); then
+    echo "Not inside a git repository." >&2
+    return 1
+  fi
+  if [ "${common_dir#/}" = "$common_dir" ]; then
+    common_dir="$(pwd)/$common_dir"
+  fi
+  repo_dir="${common_dir%%/.git*}"
+  if [ -z "$repo_dir" ]; then
+    echo "Unable to determine repository root." >&2
+    return 1
+  fi
+
+  if [ "$repo_dir" = "$wt_path" ]; then
+    echo "Inside the root directory of repo, will not delete." >&2
+    return 1
+  fi
+
+  local current default_branch
+  current=$(git rev-parse --abbrev-ref HEAD 2>/dev/null) || { echo "Not inside a git repository." >&2; return 1; }
+
+  default_branch=$(getdefault)
+
+  if [ "$current" = "$default_branch" ] || [ "$current" = "default" ]; then
+    echo "Already on default branch ($default_branch). Won't remove."
+    return 0
+  fi
+
+  echo "Switching to default branch '$default_branch'..."
+  # Use branch function if available, otherwise checkout directly in repo
+  if declare -f branch >/dev/null 2>&1; then
+    branch default || { echo "Failed to switch to default branch" >&2; return 1; }
+  else
+    git -C "$repo_dir" checkout "$default_branch" || { echo "Failed to checkout default branch" >&2; return 1; }
+  fi
+
+  echo "Removing worktree at: $wt_path"
+  if git -C "$repo_dir" worktree remove "$wt_path" 2>/dev/null; then
+    echo "Removed worktree: $wt_path"
+    return 0
+  fi
+  # try with --force as a fallback
+  if git -C "$repo_dir" worktree remove --force "$wt_path" 2>/dev/null; then
+    echo "Removed worktree (forced): $wt_path"
+    return 0
+  fi
+
+  echo "Failed to remove worktree: $wt_path" >&2
+  return 1
+}