Git command to check out recently used branches

git-cor

#!/bin/sh

# Carlos Arrastia (Holvi) 2017
#
# This script adds the git command "cor" which stands for CheckOut Recent.
# it lists the 10 most recently checked out branches and allows the user to select
# one for check out
#
# Usage:
#
# git cor
# 

# extract the branch names out of the reflog checkout lines
lines=`git reflog | grep "checkout:" | sed -nE 's/.*moving from ([^ ]*).*/\1/p'`

# if execution of command git reflog failed (i.e: not in a repository
# directory) return with failure exit code
if [ $? -ne 0 ]; then exit 1; fi

# get a set with the 10 latest branches checked out
recent=""
for line in $lines; do
    # add the branch to the list if it doesn't exist
    match=`echo $recent | grep "\\b$line\\b"`
    if [ -z "$match" ]; then
        recent="$recent $line"
        # and break the loop if the list has more 10 items or more
        if [ `echo $recent|wc -w` -gt 9 ]; then
            break;
        fi
    fi
done

# print the branches
echo "\nThese are the the 10 most recently checked out branches\n"
counter=0
for branch in $recent; do
    echo "$counter) $branch"
    counter=$((counter+1))
done

# ask user for selection
while true; do
    echo ""
    read -p "Select the branch number to check out 0-9 or q to quit: " sel
    case $sel in
        # if it is a number check out the branch matching the index
        [0-9] )
            counter=0
            for branch in $recent; do
                if [ $counter -eq $sel ]; then
                    git checkout $branch
                    break;
                fi
                counter=$((counter+1))
            done

            # print a fortune if available
            if [ `which fortune` ]; then
                echo
                fortune -s
                echo
            fi

            break;;
        # exit if q is entered
        [Qq]* ) exit;;

        # notify of error with any other choice
        * ) echo "Invalid choice.";;
    esac
done