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# -*- mode: perl; tabs: 8; indent-width: 4; show-tabs: yes; -*-

# Copyright (C) 1998-2004 ERG Transit Systems, All rights reserved

#

# Module name   : Makelib.pl

# Module type   : Makefile system

#

# Description:

#       This modules builds the primary makefile for each directory,

#       used in conjunction with Makelib.pl2.  The produced makefile

#       acts as a frontend to platform builds.

#

# Notes:

#

#                       *** DO NOT DETAB ***

#

#       Beware the use of space v's tab characters within the

#       makefile generation sessions.

#

#.........................................................................#

require 5.006_001;

use strict;

use warnings;

use Getopt::Long;

use JatsError;

use JatsEnv;

use JatsMakeInfo qw(:create);

our $MakelibVersion         = "2.33";           # makelib.pl version

our $ScmRoot                = "";

our $ScmSrcDir              = "";

our $ScmMakelib             = "";

our @ScmDepends             = ();

our $ScmExpert              = 0;

our $ScmAll                 = 0;

our $ProjectBase            = "";               # Base of the user's project

our $ScmInterface           = "interface";

our @SUBDIRS                = ();

our @PLATFORMS              = ();

our %PLATFORMARGS           = ();

our @DEFINES                = "";

our @RULES                  = ();

our %PACKAGE_DIST           = ();

our $ROOTMAKEFILE           = 0;

our $PLATFORMINCLUDED       = 0;

our @BUILDPLATFORMS         = ();

our $GBE_CONFIG;

our $GBE_TOOLS;

our $GBE_PERL;

#.. Running under 'buildlib.pl' ?

#       This will be the 'require .../makelib.pl' that is present in

#       the build.pl files. Yes, its overly complicated, but it was

#       the way it was done.

#

unless ( $::ScmBuildlib )

{

    MakeLibInit();

}

sub MakeLibInit

{

    #.. Test environment

    #

    EnvImport( "GBE_BIN" );

    EnvImport( "GBE_PERL" );

    EnvImport( "GBE_TOOLS" );

    EnvImport( "GBE_CONFIG" );

    EnvImport( "GBE_MACHTYPE" );

    #.. Common stuff

    #

    require "$::GBE_TOOLS/common.pl";

    CommonInit( "makelib " );

    Debug( "version:   $MakelibVersion" );

    #.. Parse command line

    #       makefile.pl  rootdir Makelib.pl [options ...]

    #

    Verbose ("Command Line: @ARGV");

    my $opt_help = 0;

    my $result = GetOptions (

                "help+"         => \$opt_help,

                "interface=s"   => \$::ScmInterface,

                );

    MLUsage() if ( $opt_help || !$result );

    #

    #   Needs 2 command line arguments

    #

    $::ScmRoot    = StripDrive( ${ARGV[0]} );

    $::ScmRoot    = '/./' if ( $::ScmRoot eq '/'  );    # Prevent leading '//'

    $::ProjectBase= $::ScmRoot;

    $::ScmMakelib = ${ARGV[1]};

    Debug( "ARGV:      @ARGV" );

    Debug( "Root:      $::ScmRoot" );

    Debug( "Makelib:   $::ScmMakelib" );

    #.. Get the stuff from the platform definition file

    #

    ConfigLoad();

    #.. Get the stuff from the package definition file

    #

    require "$::ScmRoot/package.pl"

        if ( -f "$::ScmRoot/package.pl" );

}

#   MLUsage ---

#       Makelib command line usage.

#..

sub MLUsage

{

    Error ( "Usage: perl makefile.pl <ROOTDIR> <makelib.pl> [options ...]",

            "Valid options:",

            "   --help            Display Help",

            "   --interface=name  Set interface directory",

            );

}

#-------------------------------------------------------------------------------

# Function        : SubDir

#

# Description     : Recurse into the specified sub directories

#                   This is one of the very few directives in a 'makefile.pl'

#                   that is processed by this script - all the others are

#                   processed by makelib.pl2.

#

#                   This directive MUST appear before the 'Platform' directive

#

# Inputs          : List of sub directories to visit

#

# Returns         : Nothing

#

sub SubDir

{

    my( @NewDirs );

    Debug( "SubDir(@_)" );

    Error ("Directive 'SubDir' not allowed in this context") if ( $::ScmBuildlib  );

    #

    #   Support different constructs:

    #       'dir1 dir2'

    #       'dir1','dir2'

    #

    @NewDirs = map { split /\s+/ } @_;

    @NewDirs = grep { defined $_ } @NewDirs;

    foreach my $ThisDir ( @NewDirs )

    {

        Warning ("SubDir contains a '\\' character: $ThisDir" )

            if ( $ThisDir =~ m~\\~);

        if ( grep /^$ThisDir$/, @::SUBDIRS )

        {

            Warning( "Duplicate SubDir '$ThisDir' -- ignored." );

            next;

        }

        if ( ! ( -e $ThisDir and -d $ThisDir ) )

        {

            Error( "SubDir(): Subdirectory not found: '$ThisDir'",

                   "Current directory: $::Cwd" );

        }

        if ( ! -f $ThisDir . '/makefile.pl' )

        {

            Error( "SubDir(): makefile.pl not found in subdirectory: '$ThisDir'",

                   "Current directory: $::Cwd" );

        }

        push(@::SUBDIRS, $ThisDir);

    }

}

#-------------------------------------------------------------------------------

# Function        : RootMakefile

#

# Description     : This function is called from buildlib.pl prior to the

#                   generation of the root makefile. The Root Makefile is

#                   different to the others in this it does not have any platform

#                   specific makefiles associated with it. It is simply used to

#                   invoke the makefile in the 'src' subdirectory

#

# Inputs          : None

#

# Returns         : Nothing

#

sub RootMakefile

{

    Error ("Directive 'RootMakefile' not allowed in this context") if ( $::ScmBuildlib  );

    $::ROOTMAKEFILE = 1;

}

sub PackageDist

{

    my( $name, @elements ) = @_;

    Error ("Directive 'PackageDist' not allowed in this context") if ( $::ScmBuildlib  );

    foreach ( @elements ) {

        HashJoin( \%::PACKAGE_DIST, $;, $name, "$_" );

    }

}

sub Define

{

    Error ("Directive 'Define' not allowed in this context") if ( $::ScmBuildlib  );

    push( @::DEFINES, @_ );

}

sub Defines

{

    my( $path, $script ) = @_;

    my( $line );

    Error ("Directive 'Defines' not allowed in this context") if ( $::ScmBuildlib  );

    $script = Exists( $path, $script, "Defines" );

    open( my $fh, '<' ,$script ) ||

        Error( "cannot open '$script'" );

    while (<$fh>) {

        $_ =~ s/\s*(\n|$)//;                    # kill trailing whitespace & nl

        push( @::DEFINES, $_ );

    }

    push( @::ScmDepends, "$script" );           # makefile dependencies

    close( $fh );

}

sub Rule

{

    Error ("Directive 'Rule' not allowed in this context") if ( $::ScmBuildlib  );

    push( @::RULES, @_ );

}

sub Rules

{

    Error ("Directive 'Rules' not allowed in this context") if ( $::ScmBuildlib  );

    my( $path, $script ) = @_;

    my( $line );

    $script = Exists( $path, $script, "Rules" );

    open( my $fh, '<' ,$script ) ||

        Error( "cannot open '$script'" );

    while (<$fh>) {

        $_ =~ s/\s*(\n|$)//;                    # kill trailing whitespace & nl

        push( @::RULES, $_ );

    }

    push( @::ScmDepends, "$script" );           # makefile dependencies

    close( $fh );

}

#-------------------------------------------------------------------------------

# Function        : Platform

#

# Description     : Within "makelib.pl" the Platform directive is processed

#                   in such a manner as to trigger the verification and

#                   generation of Makefile and xxxxx.mk files in the tree

#                   below the makefile.pl

#

# Inputs          : A list of platforms for which the body of the makefile.pl

#                   are to be processed + GBE_PLATFORM

#

#                   "*", ...            - A wildcard for all platforms

#                                         Options include

#                                           --Targets (Not Products)

#                                           --Products

#                                           --NoPlatformBuilds

#                                           !xxx - Exclude a platform

#

#                   "--NoPlatformBuilds"

#

#                   "xxx"[, "yyy"]*     - A list of platforms and aliases

#

#                   "!xxx"              - A platform to be excluded

#

# Returns         :

#

sub Platform

{

    my ( @platforms ) = @_;

    my $exitVal;

    my $platform;

    my $noplatforms = 0;

    my $defplatforms = 0;

    my %platforms;

    Debug( "Platform(@_)" );

    Error ("Directive 'Platform' not allowed in this context") if ( $::ScmBuildlib  );

    #

    #   Import user platform specification (GBE_PLATFORM)

    #   Note: This is also used by the Makefile and it cannot be

    #         alias expanded or sanitised. Its not really really useful

    #

    #   Only use GBE_PLATFORM if the user has not specified to build ALL makefiles.

    #

    my %filter;

    my $filter_present = 0;

    if (  $::ScmAll == 0  )

    {

        $filter{GENERIC} = 1;

        foreach ( split( ' ', $ENV{ "GBE_PLATFORM" } || '' ) )

        {

            $filter{$_} = 1;

            $filter_present = 1;

        }

    }

    #

    #   Expand out the directive platform list (and optional arguments)

    #   Expand wildcards and aliases

    #

    #   Handle format

    #       Platform ('*', '--Options', [!Name]);

    #       Platform ('--NoPlatformBuilds' );

    #       Platform ('Name', '--Options', [!Name] );

    #       Platform ('!Name' );

    #

    #

    if ( $platforms[0] && $platforms[0] eq '*' )

    {

        my( $targets, $products );              # options

        my( @args );

        my( @exclude );

        $targets = $products = 0;

        foreach ( @platforms ) {

            next if ( /^\*$/);

            next if ( /^--Targets$/ && ($targets = 1));

            next if ( /^--Products$/ && ($products = 1));

            next if ( /^--NoPlatformBuilds/ && ($noplatforms = 1));

            next if ( /^--/ && push @args, $_ );

            next if ( /^!/  && push @exclude, $_ );

            Warning( "Platform: unknown option $_ -- ignored\n" );

        }

        #

        #   Determine the list of platforms to expand the '*' into

        #   The result may be modified by optional arguments

        #       --Targets           # Expands to all targets

        #       --Products          # Expands to all products

        #       OtherWise           # Expands to all build platforms

        #

        @platforms = ();                        # zap list

                                                # 'all' platforms

        push( @platforms, @::DEFBUILDPLATFORMS )

            unless ( $targets | $products );

        #

        #   Expand the '*' into a list of platforms that are NOT products

        #

        if ( $targets && defined( %::ScmBuildPlatforms ) )

        {                                       # targets

            foreach my $key (keys %::ScmBuildPlatforms) {

                push( @platforms, $key )

                    if (! defined( %::ScmBuildProducts ) ||

                            ! scalar $::ScmBuildProducts{ $key } );

            }

        }

        #

        #   Expand the '*' into a list of platforms that are 'products'

        #

        if ( $products && defined( %::ScmBuildProducts ) )

        {                                       # products

            foreach my $key (keys %::ScmBuildProducts) {

                push( @platforms, $key );

            }

        }

        #

        #   Distribute arguments over all expanded platforms

        #

        if ( @args )

        {

            my @baseplatforms;

            foreach  ( @platforms )

            {

                push @baseplatforms, $_, @args;

            }

            @platforms = @baseplatforms;

        }

        #

        #   Place the excluded platforms at the end of the list

        #

        push @platforms, ExpandPlatforms( @exclude );

    }

    elsif ( scalar @platforms == 1 && $platforms[0] eq "--NoPlatformBuilds" )

    {                                           # short-cut

        $noplatforms = 1;

        @platforms = @::DEFBUILDPLATFORMS;

    }

    else

    {                                           # aliasing

        @platforms = ExpandPlatforms( @platforms );

        #

        #   Process excluded platform lists

        #   Migrate excluded platforms to the end of the list

        #

        my (@include, @exclude);

        foreach ( @platforms )

        {

            next if ( m/^!/ && push @exclude, $_ );

            push @include, $_;

        }

        #

        #   If no included platforms have been found then assume that the

        #   list is an exclusion list and seed the platform list with

        #   a set of defualt platforms - like '*'

        #

        #

        @include = @::DEFBUILDPLATFORMS unless @include;

        @platforms = ( @include, @exclude );

    }

    $platform = "";                             # current platform

    #

    #   Process the directives expanded list of platforms

    #

    #

    #   Generate a HASH of lowercase known platform names

    #   This will be used to quickly validate platform names

    #

    my %lc_platforms;

    foreach  ( @::BUILDPLATFORMS )

    {

        $lc_platforms{ lc($_) } = $_;

    }

FILTER:

    foreach $_ ( @platforms )

    {

        if ( ! /^--(.*)/ )

        {

            $_ =~ s/^\s*//g;                    # leading white space

            $_ =~ s/\s*(\n|$)//;                # trailing white space

            #

            #   Remove specific platforms from the list

            #

            $defplatforms = 1;

            if ( m/!(.*)/ )

            {

                Verbose( "Excluded platform removed: $1" );

                delete $platforms{$1};

                next FILTER;

            }

            if ( exists $platforms{$_}  )

            {

                Warning( "duplicate platform '$_' -- ignored." );

                $platform = "";

                next FILTER;

            }

            #

            #   validate 'platform'

            #   Allow the user to have a bad case match ( Fred == fred == FRED )

            #

            my $lc_platform = lc($_);

            unless ( exists( $lc_platforms{$lc_platform}  ) )

            {

                Warning( "Platform '$_' not contained within BuildPlatforms -- ignored." )

                    unless ( exists( $::ScmBuildPlatforms{$_} ));

                $platform = "";

                next FILTER;

            }

            $lc_platform = $lc_platforms{$lc_platform};

            if ( $_ ne $lc_platform )

            {

                Warning( "Mixed case usage of platform '$_' -- corrected." );

                $_ = $lc_platform;

            }

                                                # filter 'platform'

            if ( $filter_present  )

            {

                if ( ! exists $filter{$_} )

                {

                    Verbose( "GBE_PLATFORM override $_ -- ignored" );

                    $platform = "";

                    next FILTER;

                }

            }

            #

            #   Platform not filtered out - must be using it.

            #

            Verbose( "Platform ... $_" );

            $platforms{$_} = 1;                 # Add to platform list

            $platform = $_;                     # new platform

        }

        elsif ( /^--NoPlatformBuilds$/ )

        {

            $noplatforms = 1;

        }

        elsif ( $platform ne "" )

        {                                       # other arguments

            Verbose( "          .. $_" );

            HashUniqueJoin( \%::PLATFORMARGS, $; , $platform, $1 ) ||

                Warning( "Duplicate argument '$platform=$_' -- ignored." );

        }

    }

    #

    #   Sort the platforms to ensure that the ordering is consistient throughout

    #

    @::PLATFORMS = sort keys %platforms;

    #

    #   Trap makefiles that don't have any platforms

    #   The user 'should' mark these as --NoPlatformBuilds

    #

    unless ( @::PLATFORMS )

    {

        Warning( "No platform definitions." )

            unless( $noplatforms || $defplatforms);

        $noplatforms = 1;

    }

#.. Common rules

#

    my( $file ) = Require( "$::GBE_CONFIG", "Rules", "Common rules " );

    push( @::ScmDepends, "$file" );

#.. Generate primary makefile

#

    $exitVal = Generate( $noplatforms || $::ROOTMAKEFILE );

    if ($::ROOTMAKEFILE == 1)

    {

        Warning ("WARNING: Problem generating Makefile ($exitVal)")

            if ($exitVal);

        return ($exitVal);

    }

    #

    #   Not creating the ROOT Makefile

    #   Exit the phase. All the work has been done

    #

    Debug( "Platform ExitVal:   $exitVal" );

    exit( $exitVal );

}

###############################################################################

# Private function section.

#       The following functions are used INTERNALLY by makelib.pl.

#

###############################################################################

#-------------------------------------------------------------------------------

# Function        : Generate

#

# Description     : Build makefiles ...

#                   Creates the command data files and the per-target .MK files

#

# Inputs          : $noplatforms    - 1 if this makefile does not have

#                                       any platforms. Also set for ROOTMAKEFILE

#

# Returns         : $exitVal

#

sub Generate

{

    my( $noplatforms ) = @_;

    my $exitVal = 0;

    #.. Build all the per-taget makefiles, if any exist

    #

    $exitVal = GeneratePlatforms()

        unless ($noplatforms );

    #.. Build the common Makefile.gbe

    #

    GenerateMakefile( $noplatforms );

    return $exitVal;

}

#-------------------------------------------------------------------------------

# Function        : GeneratePlatforms

#

# Description     : Generate all the per-taget makefiles

#                   Create all .mk files in the current directory

#

#                   Cleanup of unused .mk files is done when the WriteCommonInfo

#                   is processed. Makefiles that are no longer used will be purged

#

# Inputs          : None

#

# Returns         : exitVal

#

sub GeneratePlatforms

{

    my  $exitVal = 0;

    my  $exitVal2;

    foreach my $platform ( @::PLATFORMS )

    {

        my @CmdLine;

        push @CmdLine, $::GBE_PERL, $0, $::ScmRoot;

        push @CmdLine, $::ScmMakelib . "2";

        push @CmdLine, $platform;

        push @CmdLine, "--interface=$::ScmInterface" if ( $::ScmInterface ne "" );

        #

        #   Insert platform local arguments

        #

        if ($::PLATFORMARGS{ $platform })

        {

            foreach my $arg (split( /$;/, $::PLATFORMARGS{ $platform } )) {

                push @CmdLine,"--arg=$arg";

            }

        }

        #

        #   Invoke the command

        #   Don't use a Shell. Don't need the overhead

        #

        $exitVal2 = System( '--NoShell', @CmdLine );

        #

        #   Warn on any error

        #   Overall return code will be set if any platform fails, but we

        #   will process all of them first

        #

        if ( $exitVal2 )

        {

            Warning ("Problem generating $platform.mk in $::Cwd ($exitVal2)");

            $exitVal = $exitVal2;

        }

    }

    return $exitVal;

}

#-------------------------------------------------------------------------------

# Function        : GenerateMakefile

#

# Description     : Generate the non-platform specific makefile

#                   Once upon a time this was a real makefile

#                   Now its a simple file and a database as this offeres greater

#                   flexability.

#

#                   The file, "Makefile.gbe" contains enough info to get to the

#                   interface directory.

#

#                   The "database" is held in the interface directory as

#                       Makfile.cfg     - index to locate Makefile_nn.cfg

#                       Makefile_nn.cfg - data from a makefile.pl

#

# Inputs          : $noplatforms        - 1: no platform makefiles in this dir

#

# Returns         : Nothing

#

sub GenerateMakefile

{

    my( $noplatforms ) = @_;

    my %platform_info;

    #

    #   Determine targets that are limited to either debug or production builds

    #   This information may come from several places

    #

    foreach my $key ( @PLATFORMS )

    {

        my @args;

        UniquePush (\@args, split ( /$;/, $::PLATFORMARGS{$key} ))

            if ($::PLATFORMARGS{$key});

        UniquePush (\@args, map { s/^--//; $_} split ( /$;/, $::ScmBuildPlatforms{$key} ))

            if($::ScmBuildPlatforms{$key});

        my $hasOnlyProd  =  grep /^OnlyProd/, @args;

        my $hasOnlyDebug =  grep /^OnlyDebug/, @args;

        if ( $hasOnlyProd && $hasOnlyDebug )

        {

            Warning ("Target \"$key\" has both OnlyDebug and OnlyProd options",

                     "Both options ignored. Target will be built" );

            $hasOnlyProd = $hasOnlyDebug = 0;

        }

        $platform_info{$key}{prod}  = 1 unless $hasOnlyDebug;

        $platform_info{$key}{debug} = 1 unless $hasOnlyProd;

    }

    #

    #   Update common information in the Makefile_x.cfg file

    #

    WriteCommonInfo( \@::SUBDIRS, \%platform_info, $noplatforms, $::ROOTMAKEFILE );

    #

    #.. Maintain local information in Makefile.gbe

    #   This allows us to locate the interface directory

    #

    Message "[Control] $::Cwd";

    CreateMakeInfo();

}

1;