#!/bin/sh

#
# This script creates config/environments/*.js files using
# config/environments/*.js.example files as input and performing
# settings substitutions.
#
# It relies on a known format of the .js.example files which haven't
# been made easier to parse to still let humans copy them manually and
# do further editing or leave them as such to get the same setup as before
# the introduction of this script.
#
# The script is a work in progress. Available switches are printed
# by invoking with the --help switch. More switches will be added
# as the need/request for them arises.
#
# --strk(2012-07-23)
#

PGPORT=5432
SQLAPI_PORT=8080
MAPNIK_VERSION=
ENVIRONMENT=development

usage() {
  echo "Usage: $0 [OPTION]"
  echo 
  echo "Configuration:"
  echo "  --help                        display this help and exit"
  echo "  --with-pgport=NUM             access PostgreSQL server on TCP port NUM [$PGPORT]"
  echo "  --with-sqlapi-port=NUM        access SQL-API server on TCP port NUM [$SQLAPI_PORT]"
  echo "  --with-mapnik-version=STRING  set mapnik version string [$MAPNIK_VERSION]"
  echo "  --environment=STRING          set output environment name [$ENVIRONMENT]"
}

while test -n "$1"; do
  case "$1" in
    --help|-h)
      usage
      exit 0
      ;;
    --with-pgport=*)
      PGPORT=`echo "$1" | cut -d= -f2`
      ;;
    --with-sqlapi-port=*)
      SQLAPI_PORT=`echo "$1" | cut -d= -f2`
      ;;
    --with-mapnik-version=*)
      MAPNIK_VERSION=`echo "$1" | cut -d= -f2`
      ;;
    --environment=*)
      ENVIRONMENT=`echo "$1" | cut -d= -f2`
      ;;
    *)
      echo "Unknown option '$1'" >&2
      usage >&2
      exit 1
  esac
  shift
done

echo "PGPORT: $PGPORT"
echo "SQLAPI_PORT: $SQLAPI_PORT"
echo "MAPNIK_VERSION: $MAPNIK_VERSION"
echo "ENVIRONMENT: $ENVIRONMENT"

# TODO: allow specifying configuration settings !
for f in config/environments/${ENVIRONMENT}.js.example; do
  o=`dirname "$f"`/`basename "$f" .example`
  echo "Writing $o"

  # See http://austinmatzko.com/2008/04/26/sed-multi-line-search-and-replace/
  sed -n "1h;1!H;\${;g;s/\(,postgres: {[^}]*port: *'\?\)[^',]*\('\?,\)/\1$PGPORT\2/;p;}" < "$f" \
  | sed "s/mapnik_version:.*/mapnik_version: '$MAPNIK_VERSION'/" \
  | sed -n "1h;1!H;\${;g;s/\(,sqlapi: {[^}]*port: *'\?\)[^',]*\('\?,\)/\1$SQLAPI_PORT\2/;p;}" \
  > "$o"

done