[PATCH 3/3] New version of pre-commit hook

[Wincent Colaiuta <win@wincent.com>]

Now that "git diff --check" indicates problems with its exit code the
pre-commit hook becomes a trivial one-liner.

A side effect of this is that when "git diff --check" learns to detect
problems according to core.whitespace in the future, the hook's
behaviour will evolve to match without any changes required.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
---
 templates/hooks--pre-commit |   67 ++++--------------------------------------
 1 files changed, 7 insertions(+), 60 deletions(-)

diff --git a/templates/hooks--pre-commit b/templates/hooks--pre-commit
index 7092bae..f8c7be7 100644
--- a/templates/hooks--pre-commit
+++ b/templates/hooks--pre-commit
@@ -7,64 +7,11 @@
 #
 # 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.
+git-diff-index -M --cached --check HEAD -- && exit 0
 
-if git-rev-parse --verify HEAD 2>/dev/null
-then
-	git-diff-index -p -M --cached HEAD --
-else
-	# NEEDSWORK: we should produce a diff with an empty tree here
-	# if we want to do the same verification for the initial import.
-	:
-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/^\+//) {
-	    $lineno++;
-	    chomp;
-	    if (/\s$/) {
-		bad_line("trailing whitespace", $_);
-	    }
-	    if (/^\s* \t/) {
-		bad_line("indent SP followed by a TAB", $_);
-	    }
-	    if (/^(?:[<>=]){7}/) {
-		bad_line("unresolved merge conflict", $_);
-	    }
-	}
-    }
-    exit($found_bad);
-'
+cat >&2 <<EOF
+fatal: commit aborted due to whitespace problems
+specify --no-verify to bypass these checks and commit anyway
+EOF
+
+exit 1
-- 
1.5.3.7.1159.g2f071-dirty