Making Commit Messages Greate Again

make-commits-greate-again.sh

#!/usr/bin/env bash

# Making Commit Messages Great Again
# Following https://www.conventionalcommits.org/ and
# http://chris.beams.io/posts/git-commit/#seven-rules
# https://regex101.com/r/Up1Y06/5

COMMIT_MSG_FILE=$1
START_LINE=$(head -n1 "$COMMIT_MSG_FILE")
PATTERN="^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)+(\([a-zA-Z0-9 -_\/]+\))?!?:\s[a-zA-Z0-9 -_\/]+$"

if ! [[ "$START_LINE" =~ $PATTERN ]]; then
  echo -e "\n\033[1;92mmessage:\033[0m $START_LINE\033[1;91m => does not obey convention\033[0m"
  echo "Please follow https://www.conventionalcommits.org/ convention"
  exit 1
fi

# Separate subject from body with a blank line
if [ "$(< "$COMMIT_MSG_FILE" wc -l)" -gt 1 ]; then
  SECONDLINE=$(sed -n '2p' < "$COMMIT_MSG_FILE")
  if [[ -n $SECONDLINE ]]; then
    echo "Separate subject from body with a blank line"
    echo "Visit https://chris.beams.io/posts/git-commit/#separate for more information"
    exit 1
  fi
fi

# Limit the subject line to 60 characters
if [ "$(echo -n "$START_LINE" | wc -c)" -gt 60 ]; then
  echo "Limit the subject line to 50 characters"
  echo "Visit https://chris.beams.io/posts/git-commit/#limit-50 for more information"
  exit 1
fi

# Capitalize the subject line
## First we must guaranty that the subject line only have one ":"
if [ "$(tr -dc ':' <<<"$START_LINE" | wc -c)" -gt 1 ]; then
  echo "Only one ':' is allow"
  exit 1
fi

SUBJECT=$(cut -d':' -f2 <<<"$START_LINE" | xargs)
if [[ "${SUBJECT:0:1}" =~ ^[[:lower:]]+$ ]]; then
  echo "Subject must be capitalize: $SUBJECT"
  echo "Visit https://chris.beams.io/posts/git-commit/#capitalize for more information"
  exit 1
fi

# Do not end the subject line with a period
if [[ "${START_LINE: -1}" == "." ]]; then
  echo "Do not end the subject line with a period"
  echo "Visit https://chris.beams.io/posts/git-commit/#end for more information"
  exit 1
fi

# Use the imperative mood in the subject line
## This is cover by conventionalcommits.org

# Wrap the body at 72 characters
i=0
while IFS= read -r line; do
  ((i=i+1))
  if [ "$(echo -n "$line" | wc -c)" -gt 72 ]; then
    CHARECTERS=$(echo -n "$line" | wc -c)
    echo "Wrap the body at 72 characters"
    echo "Found $CHARECTERS on line $i"
    echo "Visit https://chris.beams.io/posts/git-commit/#wrap-72 for more information"
    exit 1
  fi
done < "$COMMIT_MSG_FILE"

# Use the body to explain what and why vs. how
## Imposible to validate via bash script.