Authy Pre-commit hook

pre-commit

#!/bin/sh

# Check commits for trailing spaces, tabs at the begging of file 
# and bad merges

# Save on .git/hooks/pre-commit
# Make file executable

if git rev-parse --verify HEAD 2>/dev/null
then
  git diff-index -p -M --cached HEAD
else
  :
fi |

perl -e '
    my $found_bad = 0;
    my $filename;
    my $reported_filename = "";
    my $lineno;
    sub bad_line {
	my ($why, $line) = @_;
	if (!$found_bad) {
	    print STDERR "*\n";
	    print STDERR "* You have some suspicious patch lines:\n";
	    print STDERR "*\n";
	    $found_bad = 1;
	}
	if ($reported_filename ne $filename) {
	    print STDERR "* In $filename\n";
	    $reported_filename = $filename;
	}
	print STDERR "* $why (line $lineno)\n";
	print STDERR "$filename:$lineno:$line\n";
    }
    while (<>) {
	if (m|^diff --git a/(.*) b/\1$|) {
	    $filename = $1;
	    next;
	}
	if (/^@@ -\S+ \+(\d+)/) {
	    $lineno = $1 - 1;
	    next;
	}
	if (/^ /) {
	    $lineno++;
	    next;
	}
	if (s/^\+//) {
	    $lineno++;
	    chomp;
      
      if (/^\t/)  {
        bad_line("Line starts with TAB", $_);
      } 
	    if (/\s$/) {
        bad_line("Trailing whitespace", $_);
	    }
	    if (/^\s* 	/) {
        bad_line("Indented SPACE followed by a TAB", $_);
	    }
	    if (/^(?:[<>=]){7}/) {
        bad_line("Unresolved merge conflict", $_);
	    }
	}
    }
    exit($found_bad);
'