Cleans up stale unmerged branches older then 4 months

clean-stale-unmerged-branches.sh

#!/bin/bash
# vim: set ts=4 sw=4 expandtab tw=79 :
#title          :cleanup-stale-unmerged-branches.sh
#description    :This script cleans up all unmerged branches older then 4 months, except develop and master
#author		:[email protected]
#date           :2018-04-04
#version        :0.1
#notes          :initially based on https://gist.github.com/dominics/1762685
#usage		:clean-stale-unmerged-branches.sh unmerged.txt

set -e

c_red=`tput setaf 1 || tput setf 4`
c_yellow=`tput setaf 3 || tput setf 6`
c_reset=`tput sgr0`

oldest_branch_limit=$(date -v-4m +%s)

echo "Retrieving obsolete branches older then timestamp $oldest_branch_limit into $1"

for b in $(git branch --remote --no-merged); do
    echo -e $b `git show $b --date=format:'%Y-%m-%d %H:%M:%S' --pretty="format:  Last commit: %cd %ae" | head -n 1`;
done > "$1"

echo "Parsing now $1"
while IFS='' read -r line || [[ -n "$line" ]]; do
    cols=( $line )

    branchname=${cols[0]}
    if [ $branchname != "origin/develop" -a $branchname != "origin/master" ]; then
	    lastdate=${cols[3]}
	    lasttime=${cols[4]}
	    last_timestamp=$(date -jf "%Y-%m-%d" $lastdate +%s)
	    
	    if [ "$last_timestamp" -lt "$oldest_branch_limit" ];then
			echo "Going to delete branch: $line"

			remote=$(cut -d "/" -f1 <<< $branchname)
			qualifiedname=$(sed "s/origin\///" <<< $branchname) 

			git push $remote ":$qualifiedname"
			echo "Deleted $qualifiedname"
	    fi
	else
		 echo "Detected $branchname. Ignoring it"   
   	fi
done < "$1"

echo "Removing $1"
rm "$1"

echo "All done. Remember to git remote prune $remote"