git-infer

#!/usr/bin/env bash
set -uo pipefail

usage() {
    cat <<EOF
git infer:
    Commit changes with an automatically generated message

    (from https://github.com/moondewio/git-infer)

USAGE
    git infer [-a] [-A] [-h]

       -a    Include all tracked files
       -A    Include all files, even untracked ones
       -h    Show this help message
EOF
}


while getopts ":aAh" opt; do
  case $opt in
    a)
      git add -u
      ;;
    A)
      git add `git rev-parse --show-toplevel`
      ;;
    h)
      usage
      exit
      ;;
  esac
done

STATUS=$(git status --porcelain | grep -v '^ ' | grep -v '^?')

COMMIT_MSG=$(awk '
BEGIN {
  updatedCount = 0;
  addedCount = 0;
  removedCount = 0;
  renamedCount = 0;
}
$1 == "M" {
  updated[updatedCount] = substr($0, 4);
  updatedCount += 1
}
$1 == "A" || $1 == "??" {
  added[addedCount] = substr($0, 4);
  addedCount += 1
}
$1 == "D" {
  removed[removedCount] = substr($0, 4);
  removedCount += 1
}
$1 == "R" {
  renamed[renamedCount] = substr($0, 4);
  renamedCount += 1
}
END {
  if (updatedCount > 0) {
    updatedMsg = "";
    for (i = 0; i + 1 < updatedCount; i++) {
      updatedMsg = updatedMsg updated[i] ", "
    };
    updatedMsg = updatedMsg updated[updatedCount - 1]
    updatedMsg = "Modify " updatedMsg
  }

  if (addedCount > 0) {
    addedMsg = "";
    for (i = 0; i + 1 < addedCount; i++) {
      addedMsg = addedMsg added[i] ", "
    };
    addedMsg = addedMsg added[addedCount - 1]
    addedMsg = "Add " addedMsg
  }

  if (removedCount > 0) {
    removedMsg = "";
    for (i = 0; i + 1 < removedCount; i++) {
      removedMsg = removedMsg removed[i] ", "
    };
    removedMsg = removedMsg removed[removedCount - 1]
    removedMsg = "Remove " removedMsg
  }

  if (renamedCount > 0) {
    renamedMsg = "";
    for (i = 0; i + 1 < renamedCount; i++) {
      renamedMsg = renamedMsg renamed[i] ", "
    };
    renamedMsg = renamedMsg renamed[renamedCount - 1]
    renamedMsg = "Rename " renamedMsg
  }

  changesCount = 0;

  if (updatedCount > 0) {
    changesCount += 1
  }

  if (addedCount > 0) {
    changesCount += 1
  }

  if (removedCount > 0) {
    changesCount += 1
  }

  if (renamedCount > 0) {
    changesCount += 1
  }

  if (changesCount > 1) {
    printf "Several changes\n\n"

    if (updatedCount > 0) {
      print updatedMsg
    }

    if (addedCount > 0) {
      print addedMsg
    }

    if (removedCount > 0) {
      print removedMsg
    }

    if (renamedCount > 0) {
      print renamedMsg
    }
  }

  if (changesCount == 1) {
    if (updatedCount > 0) {
      print updatedMsg
    }

    if (addedCount > 0) {
      print addedMsg
    }

    if (removedCount > 0) {
      print removedMsg
    }

    if (renamedCount > 0) {
      print renamedMsg
    }
  }
}
' <<< "$STATUS")


if [ -z "${COMMIT_MSG}" ]
then
  echo "git infer: Nothing added, updated, removed or renamed"
  exit 1
fi

git commit -m "${COMMIT_MSG}"