git-list-merged-branches - A script that can find already merged branches and provide git command to remove them

git-list-merged-branches

#!/bin/bash

getopt --test > /dev/null
if [[ $? -ne 4 ]]; then
    echo "I’m sorry, `getopt --test` failed in this environment."
    exit 1
fi

SHORT=d:b:e:h
LONG=date:,branches:,excluded:,help

# -temporarily store output to be able to check for errors
# -activate advanced mode getopt quoting e.g. via "--options"
# -pass arguments only via   -- "$@"   to separate them correctly
PARSED=$(getopt --options $SHORT --longoptions $LONG --name "$0" -- "$@")
if [[ $? -ne 0 ]]; then
    # e.g. $? == 1
    #  then getopt has complained about wrong arguments to stdout
    exit 2
fi

set -e

# use eval with "$PARSED" to properly handle the quoting
eval set -- "$PARSED"

past=$(date --date='1 months ago' --rfc-3339=seconds)
branches='develop'
excluded='master|develop'
showhelp=n

# now enjoy the options in order and nicely split until we see --
while true; do
    case "$1" in
        -d|--date)
            past="$2"
            shift 2
            ;;
        -b|--branches)
            branches=$(echo $2 | tr ',' "\n")
            shift 2
            ;;
        -e|--excluded)
            excluded=$(echo $2 | tr ',' '|')
            shift 2
            ;;
        -h|--help)
            showhelp=y
            shift
            ;;
        --)
            shift
            break
            ;;
        *)
            echo "Programming error"
            exit 3
            ;;
    esac
done

# handle non-option arguments
if [[ $# -ne 0 ]]; then
    echo "$0: No more options are expected."
    exit 4
fi

if [[ $showhelp = "y" ]]; then
  echo "
  Usage: $0 [options]

  Options:

   -d, --date        A boundry date tor which already merged branches
                     will be searched for. By default: one month ago
   -b, --branches    A comma seperated list of branches to searched already
                     merged branches against to. Default to: develop
   -e, --excluded    A comma seperated list of regex expressions to filter
                     out found branches. By default: master,develop
   -h, --help        Prints this help message.

"
  exit 5
fi

echo "# Past date: ${past}"
echo "# Branches to check:"
for branch in $branches; do
  echo "#  - ${branch}"
done
echo "# Branches to be excluded:"
for branch in $(echo "${excluded}" | tr '|' "\n"); do
  echo "#  - ${branch}"
done
echo ""

for merged in $branches; do
  echo "# Listing branches merged to ${merged} older then ${past}..." 1>&2
  for branch in $(git branch -a --merged "${merged}" | sed 's/^\s*remotes\///' | grep -vE "(${excluded})"); do
    if [[ $(git log ${branch} --since "${past}" | wc -l) -eq 0 ]]; then
      if [[ "$branch" =~ "origin/" ]]; then
        local_branch_name=$(echo "$branch" | sed 's/^origin\///')
        echo "git push origin :$local_branch_name"
      else
        echo "git branch -D $branch"
      fi
    fi
  done
done