Auto commit each changed file with generated message

auto-commit.sh

# ------------------------------------------------------------
# auto-commit
# Commit each changed file separately with an auto-generated
# commit message based on the file status.
#
# Features:
# - Creates one commit per file
# - Generates message: Create / Modify / Delete / Rename / Copy
# - Refuses to run if staged changes already exist
#
# Requirements:
# - Must be inside a git repository
# - Working tree may have changes, but index must be clean
#
# Install:
#   curl -fsSL "https://gist.githubusercontent.com/sajaddp/98908cc2f958a47f1575cc03ec52f88c/raw/7c8794e1ffde7234881c86608cc22f94842405cd/auto-commit.sh" -o ~/.auto-commit.sh
#   echo 'source ~/.auto-commit.sh' >> ~/.bashrc
#   source ~/.bashrc
#
# Usage:
#   ac
#
# Notes:
# - The function name is auto_commit
# - The command alias provided is: ac
# ------------------------------------------------------------


auto_commit() {
  git rev-parse --is-inside-work-tree >/dev/null 2>&1 || return 1

  git diff --cached --quiet -- || {
    echo "Staged changes exist. Commit/reset them first." >&2
    return 2
  }

  local entry st p1 p2 msg

  while IFS= read -r -d '' entry; do
    st="${entry:0:2}"
    p1="${entry:3}"
    p2=""

    if [[ "$st" == *R* || "$st" == *C* ]]; then
      IFS= read -r -d '' p2 || p2=""
    fi

    [[ -n "$p1" ]] || continue

    case "$st" in
      '??') msg="Create $p1" ;;
      *A*)  msg="Create $p1" ;;
      *M*)  msg="Modify $p1" ;;
      *D*)  msg="Delete $p1" ;;
      *R*)  msg="Rename $p1 -> $p2" ;;
      *C*)  msg="Copy $p1 -> $p2" ;;
      *)    msg="Update $p1" ;;
    esac
    msg="${msg//$'\n'/ }"

    if [[ "$st" == *R* || "$st" == *C* ]]; then
      [[ -n "$p2" ]] || { echo "Bad rename/copy entry for: $p1" >&2; return 1; }
      git add -A -- "$p1" "$p2" || return 1
    else
      git add -A -- "$p1" || return 1
    fi

    git diff --cached --quiet -- && continue

    git commit -m "$msg" || return 1
  done < <(git status --porcelain=v1 -z --untracked-files=all)
}
alias ac="auto_commit"