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#! /usr/bin/perl
# This file is part of GNU Dico
# Copyright (C) 2014, 2016 Sergey Poznyakoff
#
# GNU Dico is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Dico is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Dico.  If not, see <http://www.gnu.org/licenses/>.

=head1 NAME

bootstrap - Bootstrap the Dico project
    
=head1 SYNOPSIS

B<bootstrap>
[B<-ahmnv>]    
[B<--add>]
[B<--help>]    
[B<--new>]
[B<--modules>]    
[B<--dry-run>]
[B<--verbose>]
[I<NAME>...]

=head1 DESCRIPTION

Bootstrap the Dico project.  This is the first command that should be run
after cloning the project from the repository in order to be able to built
it.

When run without arguments performs the following actions:

=over 4

=item 1. Pulls in git submodules.

=item 2. Creates autoconf/automake sources for building Dico modules.

Recreates F<configure.ac> and F<modules/Makefile.am> from stub files
F<configure.boot> and F<modules/stub.am>.  The list of modules is obtained
from the contents of the F<modules> directory -- each subdirectory
is supposed to contain one module.

Additional F<configure.ac> code for each module is obtained from
file F<module.ac> in each module directory.  See the description of
this file in section B<FILES>.

=item 3. Bootstraps the B<gnulib> submodule.

=back    

The program must be run from the Dico source tree topmost directory.
    
When given the B<-m> (B<--modules>) option, only the second step is
performed.

When run with B<-a> (B<--add>, B<--new>) option, the program creates
basic infrastructure for modules named in the command line.  For each
I<NAME> it creates directory F<modules/I<NAME>>.  Withih that directory,
it creates two files: F<Makefile.am> from F<modules/template.am>, and
F<I<NAME>.c>, which contains a stub code for the module.  The new module
is then integrated into F<configure.ac> and F<modules/Makefile.am> files.    

By default, the program prints only error diagnostics.  That means that
upon success, it will terminate quietly, without producing a single line
on output.  This can be changed using the B<-v> (or B<--verbose>) option.
When the option is given once, the program prints general description before
running each of the three steps described above.  Two B<-v> options instruct
it to also print whatever output that was generated when running auxiliary
commands.  Finally, three B<-v>'s produce additional debugging information.    

The B<-n> (B<--dry-run>) option instructs the tool to print what would have
been done without actually doing it.
    
=head1 OPTIONS

=over 4

=item B<-a>, B<--add>, B<--new>

Create basic infrastructure for modules named in the command line and
add them to F<configure.ac> and F<modules/Makefile.am>
    
=item B<-n>, B<--dry-run>

Don't do anything, just print what would have been done.    

=item B<-m>, B<--modules>

Run only the second step: creation of autoconf/automake sources for
Dico modules.     
    
=item B<-v>, B<--verbose>

Increase output verbosity.  Multiple options accumulate.    

=back

The following options are passed to the B<gnulib> bootstrap script
verbatim:

=over 4

=item B<--gnulib-srcdir=>I<DIRNAME>
    
Specifies the local directory where B<gnulib> sources reside.  Use this if
you already have gnulib sources on your machine, and do not want to waste
your bandwidth downloading them again.

=item B<--no-git>

Do not use git to update B<gnulib>.  Requires that B<--gnulib-srcdir> point
to a correct gnulib snapshot.

=item B<--skip-po>

Do not download po files.
    
=back    
    
The following options cause the program to display informative text and
exit:    
    
=over 4    
    
=item B<-h>

Show a short usage summary.

=item B<--help>

Show man page.    

=item B<--usage>

Show a concise command line syntax reminder.     
    
=back
    
=head1 FILES    

The following files are used as templates to create output files.  When
creating output file, each line from the corresponding template is read,
I<macro expansion> is performed, and the resulting string is written to the
output file.

During macro expansion, each occurrence of B<< <I<NAME>> >> is replaced with
the contents of the macro variable I<NAME>, if it is defined.  Expansion
of undefined variables leaves the text as is.

The construct B<< <I<NAME>#I<TEXT>> >> is expanded if it appears on a line
alone, possibly preceded by any string of characters.  It works similarly
to B<< <I<NAME>> >>, except that if I<NAME> expands to multiple lines, the
second and subsequent lines of expansion are prefixed with I<TEXT> on output.
If I<TEXT> is empty, the content of the source line immediately preceding the
construct is used instead.  This makes it possible to use expansions after a
comment character.  E.g. if the variable B<HEADING> contains:

    This file is generated automatically.
    Please, do not edit.
    See the docs for more info.

and the input file contains:

    dnl <HEADING#>

Then, the resulting expansion will be:    

    dnl This file is generated automatically.
    dnl Please, do not edit.
    dnl See the docs for more info.

The macro variables are specific for each file, and are described below.

For each file, a special comment sequence is defined.  Lines beginning
with that sequence are omitted from the output.    
    
=over 4

=item F<configure.boot>

Produces the F<configure.ac> file.  Comment marker is B<##>.
The following variables are defined:

=over 8

=item B<MODULES>

B<Autoconf> code for each module, obtained from the F<module.ac>
files.

=item B<HEADING>

Generates an initial header text, warning the reader that the file is
generated automatically and informing him about the ways to recreate
that file.

=item B<STATUS_OUTPUT>

A list of printable description for modules that can be disabled.  Each
module is represented with a line

    MODNAME ................ STATUS

where MODNAME is the module name and STATUS is the module status variable
(which produces B<yes> or B<no> at configure time, depending on whether
the module is enabled or not).

This is intended for use in B<AC_CONFIG_COMMANDS>.    

=item B<STATUS_DEFN>    

A list of assignments for module status variables, intended
for use in B<AC_CONFIG_COMMANDS>.

=back

The following code illustrates the use of the latter two variables:

  AC_CONFIG_COMMANDS([status],[
echo<STATUS_OUTPUT>                    
],
                     [<STATUS_DEFN>])
    
=item F<modules/*/module.ac>

This file is optional.  If present, it contains the B<autoconf> code for
that module, which is appended to the contents of the B<MODULES> variable
used for creating F<configure.ac>.

No macro substitutions are performed for that file.

Comment marker is B<##>.

The following comments starting with B<## module> are I<pragmatic> ones,
and are treated specially:

=over 8

=item B<## module name: I<NAME>>

Use I<NAME> as module name when creating variable names for that module.  This
is useful when the module name contains symbols that cannot be used in variable
names (as in, e.g. B<dict.org>).

=item B<## module description: I<TEXT>>    

Use I<TEXT> as module description in B<STATUS_OUTPUT> (see F<configure.boot>).

=item B<## module category:>

Reserved for future use.

=back

As well as other B<##> comments, these comments do not appear in the output.
    
=item F<modules/stub.am>

Produces the file F<modules/Makefile.am>.  Comment marker is B<##>.

Macro variables:

=over 8
    
=item B<HEADING>

Same as in F<configure.boot>.

=item B<MODULES>

Produces B<Makefille.am> code for the B<SUBDIRS> variable.    

=back
    
=item F<modules/template.c>

This template is used when B<-a> (B<--add>, B<--new>) option is given.
It produces the file F<modules/I<NAME>/I<NAME>.c>.  Comment marker is B<//>.

Macro variables:

=over 8

=item B<MODNAME>

Expands to the name of the module.

=back    
    
=item F<modules/template.am>
    
This template is used when B<-a> (B<--add>, B<--new>) option is given.
It produces the file F<modules/I<NAME>/Makefile.am>.

Macro variables:

=over 8

=item B<MODNAME>

Expands to the name of the module.

=back
    
=back    

=head1 EXIT CODES

=over 4

=item B<0>

Successful termination.

=item B<64>

Command line usage error.

=item B<66>

Can't open input file.    
    
=item B<73>

Can't create output file.    

=back

=head1 BUGS

Error handling can be made better.
    
=cut    

use strict;
use Getopt::Long qw(:config gnu_getopt no_ignore_case);
use Pod::Usage;
use Pod::Man;
use File::Temp qw(tempfile);
use File::Basename;
use Data::Dumper;
use IPC::Open3;
use Symbol 'gensym';

use constant EX_OK           => 0;
use constant EX_USAGE        => 64;    # command line usage error
use constant EX_DATAERR      => 65;    # data format error
use constant EX_NOINPUT      => 66;    # cannot open input file
use constant EX_SOFTWARE     => 70;    # internal software error (not used yet)
use constant EX_CANTCREAT    => 73;    # can't create (user) output file

my $progname = basename($0);
my $progdescr = "Recreate Dico module autoconf structure";
my $addmod;
my $dry_run;
my $verbose;
my $modules;
my @gnulib_options;
my $autoconf = "module.ac";
my $config_stub = "configure.boot";
my $makefile_stub = "modules/stub.am";
my $makefile = "modules/Makefile.am";
my %outfile;

my %categories; # not used now

sub error {
    my $msg = shift;
    local %_ = @_;
    my $fd = defined($_{fd}) ? $_{fd} : \*STDERR;
    print $fd "$progname: " if defined($progname);
    print $fd "$_{prefix}: " if defined($_{prefix});
    print $fd "$msg\n"
}

sub abend {
    my $code = shift;
    print STDERR "$progname: " if defined($progname);
    print STDERR "@_\n";
    exit $code;
}

my $status = 0;

sub rewrite_configure_ac {
    my $ref = shift;
    
    my %vartab = (
	'overwrite' => 1,
	'tempfile' => 1,
	'ignorecomm' => '##',
	'HEADING' => "Do not edit. -*- mode: autoconf; buffer-read-only: t; -*- vi: set ro:\
This file is created automatically from $config_stub.\
To recreate, run $progname from the top of Dico source tree.
",
	'MODULES' => sub {
	    my $s;
	    
	    foreach my $name (sort keys %{$ref}) {
		my $h = $ref->{$name};
		$s .= "# Module $name\n";
		if (defined($h->{autoconf})) {
		    open(my $afd, "<", $h->{autoconf})
			or abend(EX_NOINPUT,
				 "can't open $h->{autoconf} for reading: $!");
		    while (<$afd>) {
			next if /^##/;
			$s .= $_;
		    }
		    close $afd;
		}
		$s .= "\n";
		$s .= "DICO_TESTS($h->{dir})\n" if ($h->{tests});
		$s .= "AC_CONFIG_FILES([$h->{dir}/Makefile])\n";
		$s .= "\n# End of module $name\n\n";
	    }
	    return $s;
	},
	'STATUS_OUTPUT' => sub {
	    return join "\n",
	     map {
		 my $n;
		 if (defined($ref->{$_}{descr})) {
		     $n = $ref->{$_}{descr};
		 } else {
		     $n = $_;
		     $n =~ s/\b(\w)/\U$1/g;
		 }

		 my $l = 34 - length($n) - 2;

		 "$n " .
		 (($l > 0) ? '.' x $l : '') .
		 " \$status_$ref->{$_}{modname}";
	     }
	    grep { $ref->{$_}{status} }
	    sort keys %{$ref};
	},
	'STATUS_DEFN' => sub {
	    return join "\n",
	      map { "status_$ref->{$_}{modname}=\$status_$ref->{$_}{modname}" }
	      grep { defined($ref->{$_}{status}) }
	      sort keys %{$ref};
	}
    );
    make_file($config_stub, "configure.ac", \%vartab);
}

sub rewrite_makefile {
    my $ref = shift;

    my %vartab = (
	'overwrite' => 1,
	'tempfile' => 1,
	'ignorecomm' => '##',
	'HEADING' => "Do not edit. -*- buffer-read-only: t; -*- vi: set ro:\
This file is created automatically from $makefile_stub.\
To recreate, run $progname from the top of Dico source tree.
",
	'MODULES' => sub {
	    my $s;
	    foreach my $am (map { $ref->{$_}{am} }
			    grep { defined($ref->{$_}{am}) }
			    sort keys %{$ref}) {
		$s .= "$am\n";
	    }
	    $s .= "SUBDIRS=";
	    foreach my $dir (map { $ref->{$_}{SUBDIRS} } sort keys %{$ref}) {
		$s .= "\\\n $dir";
	    }
	    $s .= "\n";
	    return $s;
	}
    );
    make_file($makefile_stub, $makefile, \%vartab);
}

sub add_module {
    my ($name,$ref) = @_;
    my $dir = "modules/$name";

    error("adding module $name", prefix=>'DEBUG') if ($verbose>1);
    my $acname = uc($name);
    $ref->{$name}{dir} = $dir;
    $ref->{$name}{SUBDIRS} = $name;
    $ref->{$name}{modname} = $name;
    if (-r "$dir/$autoconf") {
	$ref->{$name}{autoconf} = "$dir/$autoconf";
	open(my $fd, "<", "$dir/$autoconf")
	    or abend(EX_NOINPUT,
		     "can't open $dir/$autoconf for reading: $!");
	while (<$fd>) {
	    chomp;
	    s/\s+$//;
	    if (/^##\s*module\s+name\s*:\s*([^\s]+).*$/) {
		$ref->{$name}{modname} = $1;
	    } elsif (/^##\s*module\s+description\s*:\s*(.+).*$/) {
		$ref->{$name}{descr} = $1;
	    } elsif (/^##\s*module\s+category\s*:\s*(.+).*$/) {
		$ref->{$name}{category} = $1;
		$categories{$1}++;
	    }
	    s/#.*//;
	    next if ($_ eq "");
	    if (/AM_CONDITIONAL\s*\(\s*\[${acname}_COND\]/) {
		$ref->{$name}{am} = <<EOT;
if ${acname}_COND
  ${acname}_DIR=$name
endif
EOT
;		
		$ref->{$name}{SUBDIRS} = "\$(${acname}_DIR)";
	    }
	    $ref->{$name}{status} = 1
		if (!$ref->{$name}{status} and /status_$ref->{$name}{modname}=/);
	}
	close $fd;
    }
    $ref->{$name}{tests} = (-d "$dir/tests"
			    and -f "$dir/tests/Makefile.am"
			    and -f "$dir/tests/testsuite.at");

    if (-f "$dir/Makefile.am") {
	open(my $fd, "<", "$dir/Makefile.am")
	    or abend(EX_NOINPUT,
		     "can't open $dir/$autoconf for reading: $!");
	my %checks = ('mod' => "mod_LTLIBRARIES does not contain $ref->{$name}{modname}.la",
		      'SOURCES' => "$ref->{$name}{modname}_la_SOURCES not defined");
	while (<$fd>) {
	    chomp;
	    s/\s+$//;
	    s/#.*//;
	    next if ($_ eq "");
	    if (/mod_LTLIBRARIES\s*=\s*$ref->{$name}{modname}.la/) {
		delete $checks{mod};
	    } elsif (/$ref->{$name}{modname}_la_SOURCES\s*=/) {
		delete $checks{SOURCES};
	    }
	}
	close $fd;
	if (keys(%checks)) {
	    while (my ($k,$v) = each %checks) {
		error("$dir/Makefile.am: $v");
	    }
	    $status = EX_DATAERR;
	    return;
	}
    } 
    
    if ($verbose>2) {
	print STDERR "module $name:\n";
	print STDERR Dumper($ref->{$name});
    }
}

sub replace_macro {
    my $name = shift;
    my $ref = shift;

    my $s;

    if (defined($ref->{$name})) {
	if (ref($ref->{$name}) eq 'CODE') {
	    $s = &{$ref->{$name}};
	} else {
	    $s = $ref->{$name};     
	}
    } else {
	$s = "<$name>";
    }

    return $s;
}

sub make_file {
    my $infile = shift;
    my $ofile = shift;
    my $ref = shift;
    
    error("creating $ofile from $infile", prefix => 'DEBUG') if ($verbose>1);
    return if $dry_run;
    if (!$ref->{overwrite} and -e $ofile) {
	error("$ofile already exists", prefix => 'warning');
    } else {
	open(my $ifd, "<", $infile)
	    or abend(EX_DATAERR, "can't open $infile for reading: $!");

	my $ofd;
	if (defined($ref->{tempfile})) {
	    my $tempname;
	    ($ofd, $tempname) = tempfile(DIR => dirname($infile))
		or abend(EX_CANTCREAT,
			 "can't open temporary file for creating $ofile: $!");
	    $outfile{$tempname} = $ofile;
	} else {
	    open($ofd, ">", $ofile)
		or abend(EX_CANTCREAT, "can't open $ofile for writing: $!");
	}
	while (<$ifd>) {
	    next if (defined($ref->{ignorecomm}) and /^$ref->{ignorecomm}/);
	    if (/^(.*)<([A-Z][A-Z0-9_]+)#([^>]*)>\s*$/) {
		my $pfx = $3 || $1;
		$_ = $1 . replace_macro($2, $ref);
		chomp;
		s/\n/\n$pfx/g;
		$_ .= "\n";
	    } else {
		s/<([A-Z][A-Z0-9_]+)>/replace_macro($1, $ref)/gex;
	    }
	    print $ofd $_;
	}
	close($ifd);
	close($ofd);
    }
}    

sub create_module {
    my $name = shift;
    my $dir = "modules/$name";

    if (-d $dir) {
	error("$dir already exists", prefix => 'warning');
    } else {
	error("creating $dir", prefix => 'DEBUG') if ($verbose>1);
	mkdir($dir) unless $dry_run;
    }
    make_file("modules/template.am", "$dir/Makefile.am",
	      { ignorecomm => '##',
		MODNAME => $name });
    make_file("modules/template.c", "$dir/${name}.c",
	      { ignorecomm => '//',
		MODNAME => $name });
}

sub cleanup {
    foreach my $f (keys %outfile) {
	unlink $f if (-e $f);
    }
}

sub checksrc {
    return 0 unless -e $config_stub;
    open(my $fd, '<', $config_stub)
	or abend(EX_NOINPUT, "can't open $config_stub: $!");
    my $anchor;
    while (<$fd>) {
	chomp;
	s/^\s+//;
	if (/^AC_CONFIG_SRCDIR\(\[(.*)\]\)/) {
	    $anchor = $1;
	    last;
	}
    }
    close $fd;
    abend(EX_DATAERR, "AC_CONFIG_SRCDIR not found in $config_stub")
	unless defined $anchor;
    return -e $anchor;
}

sub modproc {
    my %modtab;
    my @modnames = map { s#modules/##; $_; } grep { -d $_; } glob "modules/*";

    error("Bootstrapping dico modules", fd => \*STDOUT) if $verbose;
    
    foreach my $m (@modnames) {
	add_module($m, \%modtab);
    }

    rewrite_configure_ac(\%modtab);
    rewrite_makefile(\%modtab);

    if ($status == 0 and !$dry_run) {
	while (my ($from, $to) = each %outfile) {
	    rename $from, $to
		or abend(EX_CANTCREAT, "can't rename $from to $to: $!");
	}
    }
}

sub run {
    error("running @_", prefix=>'DEBUG') if ($verbose>2);
    return if $dry_run;
    my $out = gensym;
    open(my $err, ">&", \*STDERR) or die "can't dup STDERR: $!";
    open(my $in, "<&", \*STDIN) or die "can't dup STDIN: $!";
    my $pid = open3($in, $out, $err, @_);
    my $logpid;
    if ($verbose > 1) {
	$logpid = fork();
	if ($logpid == 0) {
	    while (<$out>) {
		chomp;
		error($_, fd => \*STDOUT, prefix => "[$_[0]]");
	    }
	    exit;
	}
    }
    waitpid($pid, 0);
    my $ret = 0;
    if ($? == -1) {
	abend(EX_CANTCREAT, "failed to run @_");
    } elsif ($? & 127) {
	abend(EX_CANTCREAT, "$@ exited on signal " . ($? & 127));
    } elsif (my $e = ($? >> 8)) {
	abend(EX_CANTCREAT, "$@ exited with status $e");
    }
    waitpid($logpid, 0) if defined $logpid;
}    

sub gnulib_init {
    my $gnulib = 'gnulibinit';
    unless (-l $gnulib) {
    	symlink('gnulib/build-aux/bootstrap', $gnulib)
    	    or abend(EX_CANTCREAT, "can't symlink gnulib/build-aux/bootstrap: $!");
    }
    error("Bootstrapping gnulib", fd => \*STDOUT) if $verbose;
    run('sh', $gnulib, @gnulib_options);
}

END {
    cleanup;
}

$SIG{HUP} = $SIG{INT} = $SIG{QUIT} = $SIG{TERM} = \&cleanup;

#
GetOptions("h" => sub {
                    pod2usage(-message => "$progname: $progdescr",
                              -exitstatus => 0);
           },
           "help" => sub {
                    pod2usage(-exitstatus => EX_OK, -verbose => 2);
           },
	   "usage" => sub {
                    pod2usage(-exitstatus => EX_OK, -verbose => 0);
           },
	   "add|new|a" => \$addmod,
           "dry-run|n" => \$dry_run,
           "verbose|v+" => \$verbose,
	   "modules|m" => \$modules,
	   "gnulib-srcdir=s" => sub { push @gnulib_options, "--$_[0]=$_[1]" },
	   "skip-po|no-git" => sub { push @gnulib_options, "--$_[0]" }
) or exit(EX_USAGE);

abend(EX_USAGE, "must run from the Dico source tree topmost directory")
    unless checksrc();

++$verbose if $dry_run;

if ($addmod) {
    abend(EX_USAGE, "not enough arguments") unless @ARGV;
    foreach my $mod (@ARGV) {
	create_module($mod);
    }
    modproc();
} elsif ($modules) {
    abend(EX_USAGE, "too many arguments") if @ARGV;
    modproc();
} elsif ($#ARGV >= 0) {
    abend(EX_USAGE, "too many arguments; did you mean --new?");
} else {
    abend(EX_USAGE, "this does not look like a clone of the Dico repository; try $progname --help for more info")
	unless -d '.git';

    error("Initializing submodules", fd => \*STDOUT) if $verbose;
    run('git submodule init');
    run('git submodule update');
    modproc();
    gnulib_init();
}

exit($status);

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