entrypoint.sh

#!/usr/bin/env bash

set -euo pipefail
[[ -n "${DEBUG:-}" ]] && set -x

COMMIT_MESSAGE="${1:?Missing commit_message input}"
REPO="${2:?Missing repo input}"
BRANCH="${3:?Missing branch input}"
EMPTY="${4:-false}"
read -r -a FILE_PATTERNS <<<"${5:?Missing file_pattern input}"

git config --global --add safe.directory "$GITHUB_WORKSPACE"

adds=()
deletes=()

while IFS= read -r -d $'\0' line; do
  [[ -n "${DEBUG:-}" ]] && echo "line: '$line'"

  # Extract the status in the tree and status in the index (first two characters)
  index_status="${line:0:1}"
  tree_status="${line:1:1}"

  # Renamed files have status code 'R' and two filenames separated by NUL. We need to read
  # an additional chunk (up to the next NUL) to get the new filename.
  if [[ "$index_status" == "R" || "$tree_status" == "R" ]]; then
    IFS= read -r -d $'\0' old_filename
    new_filename="${line:3}"

    echo "Renamed file detected:"
    echo "Old Filename: $old_filename"
    echo "New Filename: $new_filename"
    echo "-----------------------------"
    adds+=("$new_filename")
    deletes+=("$old_filename")
    continue
  fi

  # Extract the filename by removing the first three characters (two statuses and a whitespace)
  filename="${line:3}"
  echo "Filename: $filename"

  # Print the parsed information, useful for debugging
  echo "Index Status: $index_status"
  echo "Tree Status: $tree_status"
  echo "Filename: $filename"
  echo "-----------------------------"
  # https://git-scm.com/docs/git-status

  # handle adds (A), modifications (M), and type changes (T):
  [[ "$tree_status" =~ A|M|T || "$index_status" =~ A|M|T ]] && adds+=("$filename")

  # handle deletes (D):
  [[ "$tree_status" =~ D || "$index_status" =~ D ]] && deletes+=("$filename")

done < <(git status -s --porcelain=v1 -z -- "${FILE_PATTERNS[@]}")

if [[ "${#adds[@]}" -eq 0 && "${#deletes[@]}" -eq 0 && "$EMPTY" == "false" ]]; then
  echo "No changes detected, exiting"
  exit 0
fi

ghcommit_args=()
ghcommit_args+=(-b "$BRANCH")
ghcommit_args+=(-r "$REPO")
ghcommit_args+=(-m "$COMMIT_MESSAGE")

if [[ "$EMPTY" =~ ^(true|1|yes)$ ]]; then
  ghcommit_args+=(--empty)
fi

ghcommit_args+=("${adds[@]/#/--add=}")
ghcommit_args+=("${deletes[@]/#/--delete=}")

[[ -n "${DEBUG:-}" ]] && echo "ghcommit args: '${ghcommit_args[*]}'"

ghcommit "${ghcommit_args[@]}"