easejs/tools/combine

#!/bin/bash
#
#  Copyright (C) 2010 Mike Gerwitz
#
#  This file is part of ease.js.
#
#  ease.js is free software: you can redistribute it and/or modify it under the
#  terms of the GNU Lesser General Public License as published by the Free
#  Software Foundation, either version 3 of the License, or (at your option)
#  any later version.
#
#  This program is distributed in the hope that it will be useful, but WITHOUT
#  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
#  for more details.
#
#  You should have received a copy of the GNU Lesser General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
# #

PATH_TOOLS=$( dirname "$0" )
PATH_LIB="$PATH_TOOLS/../lib"
MODULE_EXT='js'
TPL_PATH="$PATH_TOOLS/combine.tpl"
TPL_VAR='/**{CONTENT}**/'

# order matters
CAT_MODULES="util class interface"

##
# Output template header
##
tpl_header()
{
    # cut out the top of the template (before the content location)
    cat "$TPL_PATH" \
        | awk "{
            if ( \$0 == \"$TPL_VAR\" )
                exit;
            else
                print \$0;
        }"
}

##
# Output template footer
##
tpl_footer()
{
    # cut out the bottom of the template (after where we need to place the
    # content)
    cat "$TPL_PATH" \
        | awk "BEGIN { go = 0 }
        {
            if ( \$0 == \"$TPL_VAR\" )
                go = 1
            else
                if ( go == 1 )
                    print \$0;
        }"
}

##
# Removes trailing commas from array and object declarations (certain browsers,
# such as earlier versions of IE, do not parse trailing commas correctly)
#
# This is a very simple (dumb) system. It does not check to ensure we're not
# replacing text inside a string, nor is it 100% certain we're in an array or
# object declaration. However, until such an implementation is needed, I'd like
# to keep it as simple (and fast) as possible. The below implementation is
# suitable for our needs.
##
rmtrail()
{
    cat - \
        | sed -n '
            # copy first line to hold buffer
            1h

            # if not the first line, append to hold buffer
            1!H

            # if last line, process
            $ {
                # pull from hold and perform replacement
                g
                s/,\(\s*[]}]\)/\1/g

                # print result
                p
            }
        '
}

# ensure we can locate our template (should be in the /tools dir)
if [ ! -f "$TPL_PATH" ]; then
    echo "Error: combine.tpl not found ($TPL_PATH)"
    exit 1
fi


# output combined file header
tpl_header

# output each of the modules
for module in $CAT_MODULES; do
    filename="$PATH_LIB/$module.$MODULE_EXT"

    if [ ! -f "$filename" ]; then
        echo "Error: module $module not found ($filename)"
        exit 2
    fi

    # each module must be enclosed in a closure to emulate a module
    echo "/** $module **/"
    echo "( function( exports )"
    echo "{"

    # add the module, removing trailing commas
    cat $filename | rmtrail

    echo "} )( exports['$module'] = {} );"
done

# output combined file footer
tpl_footer

exit 0