#!/bin/sh
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#                      __                                                    #
#      ________ ___   / /  ___     Scala Tools Launch Script                 #
#     / __/ __// _ | / /  / _ |    (c) 2002-2003, LAMP/EPFL                  #
#   __\ \/ /__/ __ |/ /__/ __ |                                              #
#  /____/\___/_/ |_/____/_/ | |                                              #
#                           |/                                               #
##############################################################################

# $Id$

##############################################################################
# Configuration

# The configure function contains all the configurable variables of
# this script. The content of these variables may be overridden by
# defining an environment variable with the same name prefixed by
# SCALA_. For example, to run socos with a big initial heap size, one
# may run the command "env SCALA_JAVA_ARGS=-Xms1024m socos".
#
# The following environment variables are also read by this script:
# - SCALA_BOOTCLASSPATH: if defined, it is used as the default
#   bootclasspath by the Scala compiler.
#
# - SCALA_CLASSPATH: if defined, it is used as the default classpath
#   by the scala compiler.
#
# - CLASSPATH: if defined and if SCALA_CLASSPATH is undefined, it is
#   used as the default classpath by the Scala compiler.
#
# All paths and path lists must be in Unix form (i.e. use '/' as file
# separator and ':' as path separator). There is only one exception to
# this rule: CLASSPATH must be in Windows form (i.e. use '\' and ';')
# on Windows platforms.

configure() {

    # Location of the Scala library sources. These sources are
    # included in the Scala distribution.
    # This variable must refer a directory.
    RUNTIME_SOURCES={#RUNTIME_SOURCES#};

    # Location of the compiled Scala library and Scala tools. This
    # library and these tools are included in the Scala distribution.
    # This variable must refer a directory or a zip or jar file.
    RUNTIME_CLASSES={#RUNTIME_CLASSES#};

    # Location of the compiled dtd2scala tool. This tool is included
    # in the Scala distribution.
    # This variable must refer a directory or a zip or jar file.
    DTD2SCALA_CLASSES={#DTD2SCALA_CLASSES#};

    # Location of the compiled fjbg library.  This library is included
    # in the Scala distribution.
    # This variable must refer a directory or a zip or jar file.
    FJBG_CLASSES={#FJBG_CLASSES#};

    # Location of the compiled msil library. This library is included
    # in the Scala distribution.
    # This variable must refer a directory or a zip or jar file.
    MSIL_CLASSES={#MSIL_CLASSES#};

    # Location of the compiled bcel library. This library may be found
    # at http://jakarta.apache.org/bcel/.
    # This variable must refer a directory or a zip or jar file.
    BCEL_CLASSES={#BCEL_CLASSES#};

    # Location of the compiled xerces library. This library may be
    # found at http://xml.apache.org/xerces2-j/.
    # This variable must refer a directory or a zip or jar file.
    XERCES_CLASSES={#XERCES_CLASSES#};

    # Command to start the Java VM.
    JAVA_EXEC="java";

    # Additional arguments to pass to the Java VM.
    JAVA_ARGS={#JAVA_ARGS#};

    # Command to start subprocesses. This is mainly for debugging
    # purposes. One may, for example, display the Java command that is
    # started by "socos", by running "env SCALA_EXEC=echo socos".
    EXEC="exec";

}

##############################################################################
# Error functions

# Prints a warning message on stderr.
warning() {
    echo "$0: warning:" "$@" 1>&2;
}

# Prints an error message on stderr.
error() {
    echo "$0:" "$@" 1>&2;
}

# Prints an error message on stderr and exits with a non-zero status.
abort() {
    error "$@";
    exit 1;
}

##############################################################################
# File name and path list conversion functions

# Prints the OS specific form of the given Unix form file name.
get_os_filename() {
    [ $# = 1 ] || abort "internal error";
    case "$UNAME" in
        CYGWIN* ) cygpath --windows "$1";;
        *       ) echo "$@";;
    esac;
}

# Prints the OS specific form of the given Unix form path list.
get_unix_filename() {
    [ $# = 1 ] || abort "internal error";
    case "$UNAME" in
        CYGWIN* ) cygpath --unix "$1";;
        *       ) echo "$@";;
    esac;
}

# Prints the Unix form of the given OS specific form file name.
get_os_pathlist() {
    [ $# = 1 ] || abort "internal error";
    case "$UNAME" in
        CYGWIN* ) cygpath --window --path "$1";;
        *       ) echo "$@";;
    esac;
}

# Prints the Unix form of the given OS specific form path list.
get_unix_pathlist() {
    [ $# = 1 ] || abort "internal error";
    case "$UNAME" in
        CYGWIN* ) cygpath --unix --path "$1";;
        *       ) echo "$@";;
    esac;
}

##############################################################################
# Variable configuration functions

# Configures the variable with the given name. If a variable named
# SCALA_$1 is defined, assigns its value to the variable named $1,
# otherwise does nothing.
configure_variable() {
    [ $# = 1 ] || abort "internal error";
    name="$1"; shift 1;

    if set | grep "^SCALA_$name=" > /dev/null; then
        eval $name=\$SCALA_$name;
    fi;
}

# Configures and tests the path variable with the given name. If a
# variable named SCALA_$1 is defined and refers an existing directory
# or file, assigns its value to the variable named $1. If, after that,
# the variable $1 refers a non-existing path, exits with an error.
configure_path_variable() {
    [ $# = 1 ] || abort "internal error";
    name="$1"; shift 1;

    if set | grep "^SCALA_$name=" > /dev/null; then
        path=`eval echo \\\$SCALA_\$name`;
        if [ -f "$path" -o -d "$path" ]; then
            eval $name=\$SCALA_$name;
        else
            warning "File refered by SCALA_$name ($path) does not exist.";
            unset SCALA_$name;
        fi;
    fi;

    path=`eval echo \\\$\$name`;
    if [ ! -f "$path" -a ! -d "$path" ]; then
        abort "File referred by $name ($path) does not exist." \
            "Please, fix the definition of $name in file $SOURCE." \
            "Alternatively you may also define the environment" \
            "variable SCALA_$name.";
    fi
}

##############################################################################
# Path list construction functions

# Appends a named path to a named path list. Configures the path
# variable $2 and updates the path list in variable $1 by appending
# the path from variable $2.
append_path() {
    [ $# = 2 ] || abort "internal error";
    configure_path_variable "$2";

    listname="$1"; shift 1;
    pathname="$1"; shift 1;
    list=`eval echo \\\$\$listname`;

    if [ -z "$list" ]; then
        eval $listname=\$$pathname;
    else
        eval $listname=\$$listname:\$$pathname;
    fi;
}

##############################################################################
# Java invocation functions

# Invokes Java with the given arguments (which must, at least, contain
# the name of the main class) and the following additional arguments:
# - arguments specified by variable JAVA_ARGS
# - script-suffix-specific arguments
# - definition of Java properties scala.product and scala.version
# - classpath set to $JAVA_CLASSPATH
exec_java() {
    [ $# -gt 0 ] || abort "internal error";

    # configure variables
    configure_variable EXEC;
    configure_variable JAVA_EXEC;
    configure_variable JAVA_ARGS;

    # append script-suffix-specific arguments
    case "$SCRIPT" in
        *-debug* ) JAVA_ARGS="$JAVA_ARGS -Djava.compiler=NONE";;
    esac;

    # invoke Java
    $EXEC $JAVA_EXEC $JAVA_ARGS  \
        -classpath "`get_os_pathlist "$JAVA_CLASSPATH"`" \
        -Dscala.product="$SCRIPT" \
        -Dscala.version="$VERSION" \
        "$@";
}

# Starts a Java program using the Scala compiler. The given arguments
# are passed to exec_java. They must, at least, contain the name of
# the main class.
exec_compile() {
    [ $# -gt 0 ] || abort "internal error";

    # compute Java classpath
    append_path JAVA_CLASSPATH RUNTIME_CLASSES;
    append_path JAVA_CLASSPATH BCEL_CLASSES;
    append_path JAVA_CLASSPATH FJBG_CLASSES;
    append_path JAVA_CLASSPATH MSIL_CLASSES;

    # compute Scala classpath
    if [ -z "$SCALA_CLASSPATH" ]; then
        if [ -n "$CLASSPATH" ]; then
            SCALA_CLASSPATH=`get_unix_pathlist "$CLASSPATH"`;
        else
            SCALA_CLASSPATH=".";
        fi;
    fi;

    # compute Scala boot classpath
    if [ -z "$SCALA_BOOTCLASSPATH" ]; then
        append_path SCALA_BOOTCLASSPATH RUNTIME_CLASSES;
        append_path SCALA_BOOTCLASSPATH RUNTIME_SOURCES;
    fi;

    # invoke Java
    exec_java \
        -Dscala.class.path=`get_os_pathlist "$SCALA_CLASSPATH"` \
        -Dscala.boot.class.path=`get_os_pathlist "$SCALA_BOOTCLASSPATH"` \
        "$@";
}

# Starts a program using dtd2scala. The given arguments are passed to
# exec_java. They must, at least, contain the name of the main class.
exec_dtd2scala() {
    [ $# -gt 0 ] || abort "internal error";

    # compute Java classpath
    append_path JAVA_CLASSPATH DTD2SCALA_CLASSES;
    append_path JAVA_CLASSPATH XERCES_PATH;

    # invoke Java
    exec_java \
        "$@";
}

##############################################################################
# Implementation of scala-info

scala_info() {
    abort "!!! not yet implemented";
}

##############################################################################
# Definition of UNAME, SOURCE, SCRIPT, PREFIX and VERSION

unset SCRIPT;
UNAME=`uname`;
SOURCE=$0;
while [ -h "$SOURCE" ]; do
    SCRIPT=`basename "$SOURCE"`;
    LOOKUP=`ls -ld "$SOURCE"`;
    TARGET=`expr "$LOOKUP" : '.*-> \(.*\)$'`;
    if expr "${TARGET:-.}/" : '/.*/$' > /dev/null; then
        SOURCE=${TARGET:-.};
    else
        SOURCE=`dirname "$SOURCE"`/${TARGET:-.};
    fi;
done;
PREFIX=`dirname "$SOURCE"`/..;
PREFIX=`cd "$PREFIX"; pwd`;

VERSION={#VERSION#};
VERSION=${VERSION:-"unknown version"};

##############################################################################
# Test of invocation method

if [ -z "$SCRIPT" ]; then
    abort "Illegal direct invocation; invoke me through a symbolic link.";
fi;

##############################################################################
# Configuration and invocation of $SCRIPT

unset JAVA_CLASSPATH;
configure;

case "$SCRIPT" in
    scala-info ) scala_info "$@";;
    scalac*    ) exec_compile scalac.Main "$@";;
    scaladoc*  ) exec_compile scalac.Main -doc "$@";;
    scalarun*  ) exec_compile scalai.Main "$@";;
    scalaint*  ) exec_compile scalai.Main -interactive "$@";;
    dtd2scala* ) exec_dtd2scala dtd2scala.Main "$@";;
    socos*     )
        warning "Deprecated command, use scalac${SCRIPT#socos} instead.";
        exec_compile scalac.Main "$@";;
    surus*     )
        warning "Deprecated command, use scalarun${SCRIPT#surus} instead.";
        exec_compile scalai.Main "$@";;
    siris*     )
        warning "Deprecated command, use scalaint${SCRIPT#siris} instead.";
        exec_compile scalai.Main -interactive "$@";;
    *          ) abort "Don't know what to do for $SCRIPT.";;
esac;

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