attempt at new branch helpers

flakes/common/nix_modules/git/branching_setup.func.sh

@@ -0,0 +1,86 @@
+branching_setup() {
+  # Interactive helper to manage worktree.autolink and worktree.bootstrap
+  local common_dir repo_root
+  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)/$common_dir"
+  fi
+  repo_root="${common_dir%%/.git*}"
+  if [ -z "$repo_root" ]; then
+    echo "Unable to determine repository root." >&2
+    return 1
+  fi
+
+  # Build candidate ignored/untracked file list
+  local -a candidates=()
+  while IFS= read -r -d '' file; do
+    candidates+=("$file")
+  done < <(git -C "$repo_root" ls-files --others --ignored --exclude-standard -z || true)
+
+  # Include some common dotfiles at root even if tracked (for selection convenience)
+  for extra in .env .env.development .env.development.local .envrc .direnv flake.nix flake.lock; do
+    if [ -e "$repo_root/$extra" ]; then
+      candidates+=("$extra")
+    fi
+  done
+
+  # De-duplicate
+  local unique
+  unique=$(printf "%s\n" "${candidates[@]}" | awk '!seen[$0]++')
+
+  # Current config values
+  local -a current
+  while IFS= read -r line; do
+    [ -n "$line" ] && current+=("$line")
+  done < <(git -C "$repo_root" config --get-all worktree.autolink 2>/dev/null || true)
+
+  # Preselect current ones in fzf (mark with *)
+  local list
+  list=$(printf "%s\n" $unique | while read -r x; do
+    local mark=""
+    for c in "${current[@]}"; do [ "$c" = "$x" ] && mark="*" && break; done
+    printf "%s%s\n" "$mark" "$x"
+  done)
+
+  if ! command -v fzf >/dev/null 2>&1; then
+    echo "fzf not found; printing candidates. Use git config --local --add worktree.autolink <item> to add." >&2
+    printf "%s\n" "$unique"
+  else
+    local selection
+    selection=$(printf "%s\n" "$list" | sed 's/^\*//' | fzf --multi --prompt="Select autolink items: " --preview "if [ -f '$repo_root'/{} ]; then bat --color always --paging=never --style=plain '$repo_root'/{}; else ls -la '$repo_root'/{}; fi")
+    # Reset existing values
+    git -C "$repo_root" config --unset-all worktree.autolink 2>/dev/null || true
+    # Apply selection
+    if [ -n "$selection" ]; then
+      while IFS= read -r line; do
+        [ -n "$line" ] && git -C "$repo_root" config --add worktree.autolink "$line"
+      done <<EOF
+$selection
+EOF
+    fi
+    echo "Updated worktree.autolink entries."
+  fi
+
+  # Bootstrap mode
+  echo "\nBootstrap setup"
+  local current_bootstrap
+  current_bootstrap=$(git -C "$repo_root" config --get worktree.bootstrap 2>/dev/null || printf "")
+  echo "Current: ${current_bootstrap:-<none>}"
+  echo "Options: [skip] [auto] [custom command]"
+  local choice
+  if [ -n "$ZSH_VERSION" ]; then
+    read -r "choice?Enter bootstrap mode or command: "
+  else
+    read -r -p "Enter bootstrap mode or command: " choice
+  fi
+  choice=${choice:-$current_bootstrap}
+  if [ -z "$choice" ]; then
+    echo "Leaving bootstrap unchanged."
+  else
+    git -C "$repo_root" config worktree.bootstrap "$choice"
+    echo "Set worktree.bootstrap=$choice"
+  fi
+}