#!/bin/bash

themetmp=/tmp/themetmp.$$


if [ -z "$1" ]
then
    echo "Error: please specify path to your template.php ie: sites/all/themes/mytheme/template.php"
    exit
fi

if [ ! -f "$1" ]
then
    echo "Error: Unable to open $1"
    exit
fi

if [ ! -f "update.php" ]
then
    echo "Error: Please run from the drupal base dir"
    exit
fi


template_file=$1
export template_file

theme_funcs="theme"

# build a list of known function prefixes
# @todo we assume you dnt have a _ in your function overrides
theme_func_str=`grep "^function" $template_file|awk '{print $2}'|awk -F_ '{print $1}'|sort|uniq|grep -E "\w+"`
for t in $theme_func_str
do
    theme_funcs="$theme_funcs|$t"
done

export theme_funcs

# build an index of known functions
echo "Building function index.."
grep -ir "^function theme" sites/all/modules includes modules themes|grep -viE "(svn|cvs)" > $themetmp

echo "Getting theme overrides"

#get a list of overrides from the template.php
overrides=`grep -iE "^function ($theme_funcs)" $template_file|awk '{print $2}'|awk -F \( '{print $1}'|sed -r 's/^[a-z]+//g'`
for f in $overrides
do
    func=`grep "theme$f\W" $themetmp`
    if [ $? -eq 0 ]
    then
	# check our original file with the original declaration
	orig_file=`echo $func|awk -F: '{print $1}'`
	echo "{ if (match(\$0,\"function theme$f\") || o==1) { print; o=1; if (match(\$0,\"^}\")) { o=0; }} }" > /tmp/o
	awk -f /tmp/o $orig_file >/tmp/orig-def

	echo "{ if (match(\$0,\"function ($theme_funcs)$f\") || o==1) { print; o=1; if (match(\$0,\"^}\")) { o=0; }} }" > /tmp/n
	awk -f /tmp/n  $template_file >/tmp/new-def
	echo -e "\n\n ------ diff for theme$f ----- \n\n"
	diff --side-by-side /tmp/orig-def /tmp/new-def

    else
	echo "**** $f not found to be declared"
    fi
    
done

rm -f "$themetmp"
rm -f /tmp/n
rm -f /tmp/0