git-changed-paths.sh

#!/bin/bash
##############################################################################
# This script output what paths have changed using a SHA Range
#
# Example usage:
#
# Author: Earle Nietzel
# Date: 8/21/2019
# License: http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
##############################################################################

GIT_CMD="git"
GREP_CMD="grep"
CUT_CMD="cut"
SORT_CMD="sort"

usage()
{
    printf "Usage: %s [-s] <SHA start> [<SHA end>]\n" $0
}

# Set up options
while getopts "h:s" options; do
    case $options in
        h)
            usage
            exit 1
            ;;
        s)
            SHOW_CMD=1
            ;;
        [?])
            exit 1
            ;;
    esac
done

if [ -n "$2" ]
then
    SHA_END="$2"
else
    SHA_END="HEAD"
fi

if [ -n "$1" ]
then
    SHA_START=$1
else
    usage
    printf "Must supply the start SHA\n"
    exit 1
fi

CMD="$GIT_CMD log --name-only --pretty=format: $SHA_START..$SHA_END | $GREP_CMD -v '^$' | $CUT_CMD -d '/' -f1 | $SORT_CMD -u"

if [ "$SHOW_CMD" ]
then
    printf "%s\n" "$CMD"
else
    eval "$CMD"
fi