#!/bin/bash

# Copyright (c) Stephen C. Gilardi. All rights reserved.  The use and
# distribution terms for this software are covered by the Eclipse Public
# License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) which can be
# found in the file epl-v10.html at the root of this distribution.  By
# using this software in any fashion, you are agreeing to be bound by the
# terms of this license.  You must not remove this notice, or any other,
# from this software.
#
# clj-env-dir Launches Clojure, passing along command line arguments. This
#             launcher is configured using environment variables and sets
#             up CLASSPATH based on the contents of a specified directory.
#
# scgilardi (gmail)
# Created 7 January 2009
#
# Environment variables:
#
# Required:
#
#  CLOJURE_EXT  The path to a directory containing (either directly or as
#               symbolic links) jar files and/or directories whose paths
#               should be in Clojure's classpath. The value of the
#               CLASSPATH environment variable for Clojure will be a list
#               of these paths followed by the previous value of CLASSPATH
#               (if any).
#
# Optional:
#
#  CLOJURE_JAVA The command to launch a JVM instance for Clojure
#               default: java
#               example: /usr/local/bin/java6
#
#  CLOJURE_OPTS Java options for this JVM instance
#               default:
#               example:"-Xms32M -Xmx128M -server"
#
#  CLOJURE_MAIN The Java class to launch
#               default: clojure.main
#               example: clojure.contrib.repl_ln

set -o errexit
set -o nounset
#set -o xtrace

function die { echo "$1" 1>&2; exit 1; }

[ -d "${CLOJURE_EXT:-}" ] || die \
    "CLOJURE_EXT=\"${CLOJURE_EXT:-}\": directory not found"

EXT="$(find ${CLOJURE_EXT} -mindepth 1 -maxdepth 1 -print0 | tr \\0 \:)"
CLASSPATH="${EXT%:}${CLASSPATH:+:${CLASSPATH}}"
export CLASSPATH

JAVA=${CLOJURE_JAVA:-java}
OPTS=${CLOJURE_OPTS:-}
MAIN=${CLOJURE_MAIN:-clojure.main}

exec $JAVA $OPTS $MAIN "$@"