#!/bin/bash
# this script copies a Zen-based Drupal subtheme into a new, named subtheme
# the subtheme can be either a real or a linked directory in the site's themes directory

# default values
DEFAULT_LAYOUT='f'
DEFAULT_BASE='egressive_blue'
# The working directory
DEFAULT_DIR=`pwd`

usage() {
  cat <<EOT

  Usage: $0 [OPTIONS] sub_theme_name

  Create a sub theme with a given name from a designated Zen-derived base theme.

  This script should be run in your themes directory, and your base theme 

  OPTIONS
  -b - Specify the base theme in your themes directory on which to base the subtheme (default: $DEFAULT_BASE)
  -l - Specify desired layout, either 'f' for fixed or 'l' for liquid (or 'fluid') layout. (default: $DEFAULT_LAYOUT)

  EXAMPLE

  The following will create a sub theme called "noodle" based on a theme called "snazzy", using a fluid layout.
  
  $0 -b snazzy -l f noodle

EOT
}

while getopts "l" OPT ; do
  case "${OPT}" in
    b)  BASE=$OPTARG ;;
    l)  LAYOUT=$OPTARG ;;
    d)  DIR=$OPTARG ;;
    h)  usage ; exit 0 ;;
    *)  usage ; exit 1 ;;
  esac
done

shift $(($OPTIND - 1))

# grab the unflagged argument from the commandline
if [ $# -lt 1 ] ; then
  echo "You must specify a sub theme name"
  usage
  exit 1
fi

# assign them in the appropriate order
NAME=$1

# determine whether the base theme exists and is valid

# determine the CSS file to use for fixed or fluid layout
if [ -z $LAYOUT ]; then
  echo "no layout specified using default ($DEFAULT_LAYOUT)"
  LAYOUT=$DEFAULT_LAYOUT
fi

if [ $LAYOUT = "f" ]; then
  echo "using fixed layout"
  CSS="layout-fixed.css"
elif [ $LAYOUT = "l" ]; then
  echo "using fluid layout"
  CSS="layout-liquid.css"
else
  echo "$LAYOUT is an invalid layout type."
  exit
fi

# determine the base theme to copy 
if [ -z $BASE ]; then
  echo "no base theme specified using default ($DEFAULT_BASE)"
  BASE=$DEFAULT_BASE
fi

DIR=$DEFAULT_DIR

# check if theme directory already exists, and if so, warn user
if [ -d $DIR/$NAME ] ; then
  echo "The $NAME directory already exists - please remove or move it if you'd like to create it again."
  exit
fi

# work out if we're looking at a linked dir or not - supply the real dir as target
if [ -L $DIR/$BASE ] ; then
  # the "L" means, if the base directory is a symbolic link, dereference the link and create a 
  # copy of the *linked* directory here.
  TARGET=`readlink $DIR/$BASE`
  echo "using link target $TARGET instead of $DIR/$BASE which is a symbolic link"
else 
  TARGET=$DIR/$BASE
fi


# check that the target (sub)theme exists
if [ -d $TARGET ] ; then
  echo "copying $BASE theme to $NAME"
  # is it an SVN managed directory?
  if [ -d $TARGET/.svn ] ; then
    echo "$TARGET is managed by Subversion, exporting to create unmanaged subtheme $NAME"
    svn export $TARGET $NAME 
  else
    cp -Lr $TARGET $NAME
  fi
else
  echo "$TARGET doesn't exist..."
  exit
fi

#
# Change the theme name (the line 'name = ...') to the new subtheme name
#
if [ -f $NAME/$BASE.info ] ; then 
  INFO=$NAME/$BASE.info
elif [ -f $NAME/$BASE.info.txt ] ; then 
  INFO=$NAME/$BASE.info.txt
else
  echo "there's no original info file for the $BASE theme."
  exit
fi

echo "using $INFO as the info file"
sed 's/'$BASE'/'$NAME'/g' $INFO | sed 's/^\(name *= *\).*/\1'"$NAME"'/g' | sed 's/^\(description *= *\).*/\1'"Zen subtheme ($NAME is derived from $BASE)"'/g' > $NAME/$NAME.info
rm $INFO

#cp $BASE/$CSS $NAME/layout.css
#cp $BASE/print.css $NAME/print.css
#cp $BASE/html-elements.css $NAME/html-elements.css
cp $BASE/$BASE.css $NAME/$NAME.css
sed 's/$BASE/'$NAME'/g' $BASE/template.php > $NAME/template.php
sed 's/$BASE/'$NAME'/g' $BASE/theme-settings.php > $NAME/theme-settings.php

echo "Done"

exit 0