git/templates/hooks--pre-commit

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#!/bin/sh
#
# An example hook script to verify what is about to be committed.
# Called by git-commit with no arguments. The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# To enable this hook, make this file executable.
# This is slightly modified from Andrew Morton's Perfect Patch.
# Lines you introduce should not have trailing whitespace.
# Also check for an indentation that has SP before a TAB.
perl -e '
my $fh;
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";
}
open $fh, "-|", qw(git-diff-index -p -M --cached HEAD);
while (<$fh>) {
if (m|^diff --git a/(.*) b/\1$|) {
$filename = $1;
next;
}
if (/^@@ -\S+ \+(\d+)/) {
$lineno = $1 - 1;
next;
}
if (/^ /) {
$lineno++;
next;
}
if (s/^\+//) {
$lineno++;
chomp;
if (/\s$/) {
bad_line("trailing whitespace", $_);
}
if (/^\s* /) {
bad_line("indent SP followed by a TAB", $_);
}
}
}
exit($found_bad);
'