#!/bin/bash

#
# Compares two files using CodeWarrior
#
# Other diff utilities: opendiff (runs OS X FileMerge),
#                       cmp (byte-by-byte versus diff's line-by-line)
#                       p4merge
#
#
# Version 1.4 April 10, 2007
# Randall Gellens


#-----------------------------------------------
# Show script usage
#-----------------------------------------------
function usage ()
{
    X=`basename $0`
    echo "Usage: [options] $X new-file [old-file]"
    echo "Options:"
    echo "    -i: ignore case"
    echo "    -b: without extra space"
    echo "    -d: files are Internet Drafts"
    echo "    -x: use OS X FileMerge"
    echo "    -p: use Perforce p4merge"
    echo "    -c: use CodeWarrior for diff (default)"
    echo "    -v: verbose mode"
    exit 1
}


#-----------------------------------------------
# Verbose messages
#-----------------------------------------------
function say ()
{
    if [ "${opt_verb}" = "y" ]; then
        echo "$*"
    fi
}



opt_ext_sp="with"
opt_case="without"
opt_draft="n"
opt_verb="n"
opt_diff="c"

draft_dir="$HOME/IETF/Internet_Drafts"


while getopts ":ibvdxpc" opt
do
    case $opt in
    i)
        say "ignoring case"
        opt_case="with"
        ;;
    b)
        say "without extra space"
        opt_ext_sp="without"
        ;;
    x)
        say "Using OS X FileMerge"
        opt_diff="x"
        ;;
    p)
        say "Using Perforce p4merge"
        opt_diff="p"
        ;;
    c)
        say "Using CodeWarrior"
        opt_diff="c"
        ;;
    v)  
        opt_verb="y"
        say "Verbose mode"
        ;;
    d)
        say "Internet Drafts"
        opt_draft="y"
        targ_dir=$draft_dir
        ;;
    *)  
        echo "Unrecognized option: ${opt}"
        echo ""
        usage
        ;;
    esac
done

shift $(($OPTIND - 1))
new_file=${1}
old_file=${2}

# if -d was used to set targ_dir, do nothing, otherwise set
# targ_dir to the path of the first parameter, if it has one,
# otherwise set targ_dir to our directory:
if [ -z "$targ_dir" ]; then
    targ_dir="`expr "$1" : '\(.*\)/'`"
    targ_dir=${targ_dir:=`pwd`}
fi

say "directory: $targ_dir"
say "new_file: $new_file"
say "old_file: $old_file"

#
# If only one file specified, and file name contains "-[0-9][0-9]",
# second file is first file with a lower number
#

if [ $# -eq 1 ]; then
    vers="`expr "$1" : '.*-\([0-9][0-9]\)'`"
    if [ -n "$vers" ]; then
        base="`expr "$1" : '\(.*-\)[0-9][0-9]'`"
        extn="`expr "$1" : '.*-[0-9][0-9]\(.*\)'`"
        targ="`expr "$vers" - 1`"
        if [ $vers -eq 0 ]; then
            echo "New file is version -00"
            exit 1
        fi
        if [ $targ -lt 10 ]; then
            fill=0
        fi
        say "Old file assumed to be ${base}${fill}${targ}${extn}"
        old_file=${base}${fill}${targ}${extn}
    else
        echo "old_file not specified; new_file does not contain \"-xx\""
        exit 1
    fi
fi

if [ $# -eq 0 -o $# -gt 2 ]; then
    usage
fi


# Guess if filename appears to contain a path or not, and
# if not, prepend our path to it

DIRN="`expr "$new_file" : '\(.*\)/'`"
say "new file's directory: $DIRN"
if [ -z "$DIRN" ]; then
    say "new file is bare filename"
    new_file="${targ_dir}/${new_file}"
    say "new file now $new_file"
fi

DIRO="`expr "$old_file" : '\(.*\)/'`"
say "old file's directory: $DIRO"
if [ -z "$DIRO" ]; then
    say "old file is bare filename"
    old_file="${targ_dir}/${old_file}"
    say "old file now $old_file"
fi

if [ ! -f "$new_file" ]; then
    echo "New file $new_file does not exist"
    MATCHES=`ls "$new_file"`
    echo "$MATCHES"
    exit 1
fi

if [ ! -f "$old_file" ]; then
    echo "Old file $old_file does not exist"
    MATCHES=`ls "$old_file"`
    echo "$MATCHES"
    exit 1
fi

say "new file: $new_file"
say "old file: $old_file"

case $opt_diff in
c)
    /usr/bin/osascript << EOI
    tell application "CodeWarrior IDE"
        Compare Files "$new_file" to "$old_file" $opt_case case sensitive $opt_ext_sp ignore extra space with compare text file contents
        activate
    end tell
EOI
    ;;
x)
    # FileMerge shows the second file in the lower pane, so we swap
    # the usual order we pass the files
    say /usr/bin/opendiff "$old_file" "$new_file"
    /usr/bin/opendiff "$old_file" "$new_file"
    ;;
p)
    /Volumes/TiLand/Applications/p4merge.app/Contents/Resources/p4merge "$new_file" "$old_file"
    ;;
*)
    echo "Internal error: opt_diff = $opt_diff"
    exit 1
    ;;
esac