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# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.


# Java detection
# ========================================================
option('--with-java-bin-path', nargs=1,
       help='Location of Java binaries (java, javac, jar)')

@depends('--with-java-bin-path')
@imports(_from='os', _import='environ')
def java_search_paths(path):
    if path:
        # Look for javac and jar in the specified path.
        return path
    # With no path specified, look for javac and jar in $JAVA_HOME (if set)
    # and $PATH.
    if 'JAVA_HOME' in environ:
        return [os.path.join(environ['JAVA_HOME'], 'bin'),
                environ.get('PATH', '')]
    return [environ.get('PATH')]

# Finds the given java tool, failing with a custom error message if we can't
# find it.
@template
def check_java_tool(tool):
    check = check_prog(tool.upper(), (tool,), paths=java_search_paths,
                       allow_missing=True)

    @depends(check)
    def require_tool(result):
        if result is None:
            die("The program %s was not found.  Set $JAVA_HOME to your Java "
                "SDK directory or use '--with-java-bin-path={java-bin-dir}'"
                % tool)
        return result

    return require_tool

check_java_tool('java')
check_java_tool('javah')
check_java_tool('jar')
check_java_tool('jarsigner')
check_java_tool('keytool')
javac = check_java_tool('javac')

@depends(javac)
@checking('for javac version')
@imports('subprocess')
def javac_version(javac):
    try:
        output = subprocess.check_output([javac, '-version'],
                                         stderr=subprocess.STDOUT).rstrip()
        version = Version(output.split(' ')[-1])
        if version < '1.7':
            die('javac 1.7 or higher is required (found %s)' % version)
        return version
    except subprocess.CalledProcessError as e:
        die('Failed to get javac version: %s', e.output)