import feature ;
import generators ;
import "class" ;
import toolset ;
import targets ;
import "class" : new ;
import project ;

feature.feature auto-index : off "on" ;
feature.feature auto-index-internal : off "on" ;
feature.feature auto-index-verbose : off "on" ;
feature.feature auto-index-no-duplicates : off "on" ;
feature.feature auto-index-script : : free ;
feature.feature auto-index-prefix : : free ;
feature.feature auto-index-type : : free ;
feature.feature auto-index-section-names : "on" off ;

toolset.flags auto-index.auto-index FLAGS <auto-index-internal>on : --internal-index ;
toolset.flags auto-index.auto-index SCRIPT <auto-index-script> ;
toolset.flags auto-index.auto-index PREFIX <auto-index-prefix> ;
toolset.flags auto-index.auto-index INDEX_TYPE <auto-index-type> ;
toolset.flags auto-index.auto-index FLAGS <auto-index-verbose>on : --verbose ;
toolset.flags auto-index.auto-index FLAGS <auto-index-no-duplicates>on : --no-duplicates ;
toolset.flags auto-index.auto-index FLAGS <auto-index-section-names>off : --no-section-names ;

# <auto-index-binary> shell command to run AutoIndex
# <auto-index-binary-dependencies> targets to build AutoIndex from sources.
feature.feature <auto-index-binary> : : free ;
feature.feature <auto-index-binary-dependencies> : : free dependency ;

class auto-index-generator : generator
{
    import common modules path targets build-system ;
    rule run ( project name ? : property-set : sources * )
    {
        # AutoIndex invocation command and dependencies.
        local auto-index-binary = [ modules.peek auto-index : .command ] ;
        local auto-index-binary-dependencies ;

        if $(auto-index-binary)
        {
            # Use user-supplied command.
            auto-index-binary = [ common.get-invocation-command auto-index : auto-index : $(auto-index-binary) ] ;
        }
        else
        {
            # Search for AutoIndex sources in sensible places, like
            #   $(BOOST_ROOT)/tools/auto_index
            #   $(BOOST_BUILD_PATH)/../../auto_index

            # And build auto-index executable from sources.

            local boost-root = [ modules.peek : BOOST_ROOT ] ;
            local boost-build-path = [ build-system.location ] ;
            local boost-build-path2 = [ modules.peek : BOOST_BUILD_PATH ] ;

            local auto-index-dir ;

            if $(boost-root)
            {
                auto-index-dir += [ path.join $(boost-root) tools ] ;
            }

            if $(boost-build-path)
            {
                auto-index-dir += $(boost-build-path)/../.. ;
            }
            if $(boost-build-path2)
            {
                auto-index-dir += $(boost-build-path2)/.. ;
            }

            #ECHO $(auto-index-dir) ;
            auto-index-dir = [ path.glob $(auto-index-dir) : auto_index ] ;
            #ECHO $(auto-index-dir) ;

            # If the AutoIndex source directory was found, mark its main target
            # as a dependency for the current project. Otherwise, try to find
            # 'auto-index' in user's PATH
            if $(auto-index-dir)
            {
                auto-index-dir = [ path.make $(auto-index-dir[1]) ] ;
                auto-index-dir = $(auto-index-dir)/build ;
                
                #ECHO $(auto-index-dir) ;

                # Get the main-target in AutoIndex directory.
                local auto-index-main-target = [ targets.resolve-reference $(auto-index-dir) : $(project) ] ;
                
                #ECHO $(auto-index-main-target) ;

                # The first element are actual targets, the second are
                # properties found in target-id. We do not care about these
                # since we have passed the id ourselves.
                auto-index-main-target =
                    [ $(auto-index-main-target[1]).main-target auto_index ] ;

                #ECHO $(auto-index-main-target) ;

                auto-index-binary-dependencies =
                    [ $(auto-index-main-target).generate [ $(property-set).propagated ] ] ;

                # Ignore usage-requirements returned as first element.
                auto-index-binary-dependencies = $(auto-index-binary-dependencies[2-]) ;

                # Some toolsets generate extra targets (e.g. RSP). We must mark
                # all targets as dependencies for the project, but we will only
                # use the EXE target for auto-index-to-boostbook translation.
                for local target in $(auto-index-binary-dependencies)
                {
                    if [ $(target).type ] = EXE
                    {
                        auto-index-binary = 
                            [ path.native 
                                [ path.join
                                    [ $(target).path ]
                                    [ $(target).name ]
                                ]
                            ] ;
                    }
                }
            }
            else
            {
                ECHO "AutoIndex warning: The path to the auto-index executable was" ;
                ECHO "  not provided. Additionally, couldn't find AutoIndex" ;
                ECHO "  sources searching in" ;
                ECHO "    * BOOST_ROOT/tools/auto-index" ;
                ECHO "    * BOOST_BUILD_PATH/../../auto-index" ;
                ECHO "  Will now try to find a precompiled executable by searching" ;
                ECHO "  the PATH for 'auto-index'." ;
                ECHO "  To disable this warning in the future, or to completely" ;
                ECHO "  avoid compilation of auto-index, you can explicitly set the" ;
                ECHO "  path to a auto-index executable command in user-config.jam" ;
                ECHO "  or site-config.jam with the call" ;
                ECHO "    using auto-index : /path/to/auto-index ;" ;

                # As a last resort, search for 'auto-index' command in path. Note
                # that even if the 'auto-index' command is not found,
                # get-invocation-command will still return 'auto-index' and might
                # generate an error while generating the virtual-target.

                auto-index-binary = [ common.get-invocation-command auto-index : auto-index ] ;
            }
        }

        # Add $(auto-index-binary-dependencies) as a dependency of the current
        # project and set it as the <auto-index-binary> feature for the
        # auto-index-to-boostbook rule, below.
        property-set = [ $(property-set).add-raw
            <dependency>$(auto-index-binary-dependencies)
            <auto-index-binary>$(auto-index-binary)
            <auto-index-binary-dependencies>$(auto-index-binary-dependencies)
        ] ;
        
        #ECHO "binary = " $(auto-index-binary) ;
        #ECHO "dependencies = " $(auto-index-binary-dependencies) ;

        if [ $(property-set).get <auto-index> ] = "on"
        {
            return [ generator.run $(project) $(name) : $(property-set) : $(sources) ] ;
        }
        else
        {
            return [ generators.construct $(project) $(name) : DOCBOOK : $(property-set)
              : $(sources) ] ;
        }        
    }
}

# Initialization of toolset.
#
# Parameters:
#   command ?    -> path to AutoIndex executable.
#
# When command is not supplied toolset will search for AutoIndex directory and
# compile the executable from source. If that fails we still search the path for
# 'auto_index'.
#
rule init (
        command ?   # path to the AutoIndex executable.
    )
{
    if ! $(.initialized)
    {
        .initialized = true ;
        .command = $(command) ;
    }
}

toolset.flags auto-index.auto-index AI-COMMAND      <auto-index-binary> ;
toolset.flags auto-index.auto-index AI-DEPENDENCIES <auto-index-binary-dependencies> ;

generators.register [ class.new auto-index-generator auto-index.auto-index : DOCBOOK : DOCBOOK(%.auto_index) ] ;
generators.override auto-index.auto-index : boostbook.boostbook-to-docbook ;

rule auto-index ( target : source : properties * )
{
    # Signal dependency of auto-index sources on <auto-index-binary-dependencies>
    # upon invocation of auto-index-to-boostbook.
    #ECHO "AI-COMMAND= " $(AI-COMMAND) ;
    DEPENDS $(target) : [ on $(target) return $(AI-DEPENDENCIES) ] ;
    #DEPENDS $(target) : [ on $(target) return $(SCRIPT) ] ;
}

actions auto-index
{
    $(AI-COMMAND) $(FLAGS) "--prefix="$(PREFIX) "--script="$(SCRIPT) "--index-type="$(INDEX_TYPE) "--in="$(>) "--out="$(<)
}