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# Copyright (c) 2010 Vladimir Prus.
# Copyright (c) 2013 Steven Watanabe
#
# Use, modification and distribution is subject to the Boost Software
# License Version 1.0. (See accompanying file LICENSE_1_0.txt or
# http://www.boost.org/LICENSE_1_0.txt)

# Supports the lzma library
#
# After 'using lzma', the following targets are available:
#
# /lzma//lzma -- The lzma library

import project ;
import ac ;
import errors ;
import feature ;
import "class" : new ;
import targets ;
import path ;
import modules ;
import indirect ;
import property ;
import property-set ;

header = lzma.h ;
# liblzma only needed for VisualC++ builds
names = lzma liblzma ;

library-id = 0 ;

if --debug-configuration in [ modules.peek : ARGV ]
{
    .debug =  true ;
}

# Initializes the lzma library.
#
# Options for configuring lzma::
#
#   <search>
#       The directory containing the lzma binaries.
#   <name>
#       Overrides the default library name.
#   <include>
#       The directory containing the lzma headers.
#
# If none of these options is specified, then the environmental
# variables LZMA_LIBRARY_PATH, LZMA_NAME, and LZMA_INCLUDE will
# be used instead.
#
# Examples::
#
#   # Find lzma in the default system location
#   using lzma ;
#   # Find lzma in /usr/local
#   using lzma : 1.2.7
#     : <include>/usr/local/include <search>/usr/local/lib ;
#
rule init (
    version ?
    # (currently ignored)

    : options *
    # A list of the options to use

    : requirements *
    # The requirements for the target

    : is-default ?
    # Default configurations are only used when
    # not yet configured.  This option is
    # deprecated.  A configuration will be treated
    # as a default when none of <include>, <search>,
    # <name>, and <source> are present.
    )
{
    local caller = [ project.current ] ;

    if ! $(.initialized)
    {
        .initialized = true ;

        project.initialize $(__name__) ;
        .project = [ project.current ] ;
        project lzma ;
    }

    local library-path = [ feature.get-values <search> : $(options) ] ;
    local include-path = [ feature.get-values <include> : $(options) ] ;
    local library-name = [ feature.get-values <name> : $(options) ] ;

    if ! $(options)
    {
        is-default = true ;
    }

    condition = [ property-set.create $(requirements) ] ;
    condition = [ property-set.create [ $(condition).base ] ] ;

    if $(.configured.$(condition))
    {
        if $(is-default)
        {
            if $(.debug)
            {
                ECHO "notice: [lzma] lzma is already configured" ;
            }
        }
        else
        {
            errors.user-error "lzma is already configured" ;
        }
        return ;
    }
    else
    {
        if $(.debug)
        {
            ECHO "notice: [lzma] Using pre-installed library" ;
            if $(condition)
            {
                ECHO "notice: [lzma] Condition" [ $(condition).raw ] ;
            }
        }

        local mt = [ new ac-library lzma : $(.project) : $(condition) :
            $(include-path) : $(library-path) : $(library-name) ] ;
        $(mt).set-header $(header) ;
        $(mt).set-default-names $(names) ;
        targets.main-target-alternative $(mt) ;
    }
    .configured.$(condition) = true ;
}