Adds #ifdef compiler commands to all modified files in order to allow quick reversibility of the changes done between 2 provided GIT revisions.

do_reverse.pl

#!/usr/bin/perl
#
# Made by Mateusz Pusz
# Please give feedback
#
# Script purpose is to add #ifdef compiler commands to all modified
# files in order to allow quick reversibility of the changes done
# between 2 provided GIT revisions.
#

use warnings;
use strict;

my $argNum = @ARGV;
if($argNum != 3) {
    print "Usage: do_reverse.pl REV_START REV_FINISH LABEL\n\n";
    print "  REV_START   GIT revision with the old code to #ifdef\n";
    print "  REV_FINISH  GIT revision with the new code to #ifdef\n";
    print "  LABEL       ifdef label to use\n";
    exit(0);
}

my ( $rev1, $rev2, $label ) = @ARGV;

my @files = `git diff -w --name-status $rev1 $rev2`;
foreach ( @files ) {
    # skip files that were not modifed
    next if ($_ !~ /^M/);
    
    my $file = (split)[1];
    my $file_rev1 = $file . ":" . $rev1;
    my $file_rev2 = $file . ":" . $rev2;
    `git show $rev1:$file > $file_rev1`;
    `git show $rev2:$file > $file_rev2`;
    `diff -w -D $label $file_rev1 $file_rev2 > $file`;
    `rm $file_rev1`;
    `rm $file_rev2`;
}