#!/bin/bash
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Philipp's scripts code.
#
# The Initial Developer of the Original Code is
#   Philipp Kewisch <mozilla@kewis.ch>
# Portions created by the Initial Developer are Copyright (C) 2008
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

awk '
    BEGIN {
        blnr = 0
    }

    $0 ~ /^@@.*@@/ {
        line=$0
        split($0,fi,"[@\t ,+-]+");
        lnr=fi[4] - 1
        
    }

    $0 ~ /^\+\+\+/ {
        file=$2
        next
    }
    $0 ~ /^---/ {
        next
    }
    
    $0 ~ /^\+.*[ \t]+$/ {
        print file ":" lnr ": Trailing whitespace"
        print $0 
        print ""
    }

    $0 ~/\t/ && file !~ /Makefile/ {
        print file ":" lnr ": Unexpanded tab"
        print $0
        print ""
    }

    $0 ~ /^\+$/ {
        blnr= blnr + 1

        if (blnr == 2) {
            print file ":" lnr ": Redundant blank line"
            blnr = 0
        }
    }

    $0 !~ /^\+$/ {
        blnr = 0
    }

    $0 ~ /^\+.*(if|while|for each|for|catch)\(/ {
        print file ":" lnr ": Missing blank before `(`"
        print $0
        print ""
    }

    $0 !~ /^- / { lnr=lnr + 1 }
' "$@"