Land http://codereview.appspot.com/6117046/ for Guanqun.Lu@gmail.com

git-svn-id: http://skia.googlecode.com/svn/trunk@3758 2bbb7eff-a529-9590-31e7-b0007b416f81

tools/git-skia-verify

@@ -0,0 +1,95 @@
+#!/bin/sh
+#
+# Copyright 2012 Intel Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# This script builds and runs GM in current workspace with another Skia
+# revision user specifies, and then compares their results. This script is
+# useful when developers want to know whether their changes would cause any
+# regression.
+#
+# As the name of this script tells, it only works for git repository. :)
+#
+# Usage:
+#   Put this script into where your PATH can find it.
+#   And then invoke:
+#       $ git skia-verify [sha1-to-compare-default-is-HEAD^]
+#   It would delete {before,after,diff} directory under the current directory,
+#   so be warned!
+#   After it's done, check out diff/index.html for the possible differences.
+
+
+function say() {
+    # set color to yellow
+    tput setaf 3
+    echo $1
+    tput sgr0
+}
+
+function warn() {
+    # set color to red
+    tput setaf 1
+    echo $1
+    tput sgr0
+}
+
+REVISION="HEAD^"
+
+if [[ $# -eq 1 ]];
+then
+    REVISION="$1"
+fi
+
+tput clear
+
+say "Checking sanity..."
+git diff --exit-code > /dev/null
+if [[ $? -ne 0 ]];
+then
+    warn "You have uncommitted changes!"
+    exit 1
+fi
+git diff --cached --exit-code > /dev/null
+if [[ $? -ne 0 ]];
+then
+    warn "You have uncommitted changes!"
+    exit 1
+fi
+
+say "Preparing Directories..."
+rm -rf {before,after,diff}
+mkdir {before,after,diff}
+
+PREVIOUS_BRANCH=`git branch --no-color | grep "^*" | awk '{ print $2}'`
+
+say "Running GM for current revision..."
+./gyp_skia
+make BUILDTYPE=Release -j10
+if [[ $? -ne 0 ]];
+then
+    warn "Failed to compile!"
+    exit 1
+fi
+./out/Release/gm -w after
+
+say "Running GM for revision $REVISION..."
+# we run the test in a detached branch
+git checkout --detach "$REVISION"
+./gyp_skia
+make BUILDTYPE=Release -j10
+if [[ $? -ne 0 ]];
+then
+    warn "Failed to compile!"
+    say "Back to original revision..."
+    git checkout "$PREVIOUS_BRANCH"
+    exit 1
+fi
+./out/Release/gm -w before
+
+say "Back to original revision..."
+git checkout "$PREVIOUS_BRANCH"
+
+say "Comparing..."
+./out/Release/skdiff before after diff