#!/usr/bin/env perl

# ====================================================================
# anomgr: Anope Manager. Used to manage anope revision on SubVersion.
#
# For usage, see the usage subroutine or run the script with no
# command line arguments.
#
# $Id: am 7 2004-03-29 02:17:55Z dane $
#    
# ====================================================================
require 5.6.0;
use strict;
use Getopt::Std;
use Net::FTP;
use Cwd;

######################################################################
# Configuration section.
my $myver="1.0";
my $svnrev="http://www.zero.org/anosvn.php";
my $fhint="version.log";

# Default values, change or use environment variables instead.
my $copy="anope";
my $svnpath="/usr/bin";
my $svnroot="svn://zero.org/repos/$copy";
my $editor="/usr/bin/vi";

# Environment variables SVNBINDIR and SVNROOT override the above 
# hardcoded values.
$svnpath="$ENV{SVNBINDIR}" if ($ENV{SVNBINDIR});
$svnroot="$ENV{SVNROOT}"   if ($ENV{SVNROOT});
$editor="$ENV{EDITOR}"     if ($ENV{EDITOR});

# Svnlook path.
my $svnlook = "$svnpath/svnlook";

# Svn path.
my $svn = "$svnpath/svn";

# wget path. Need to change to a perl module instead...
my $wget = "$svnpath/wget";

my (
    $rev,
    $branch,
    $tag,
    $ftp,
    $dst,
    $ver_major,
    $ver_minor,
    $ver_patch,
    $ver_build,
    $ver_revision,
    $ver_comment,
    $svn_comment,
    $cver,
    $nver,
    $ctrlfile,
    $tmpfile,
    @source,
    %opt
);

{
  my $ok = 1;
  foreach my $program ($svnlook, $svn, $editor)
    {
      if (-e $program)
        {
          unless (-x $program)
            {
              warn "$0: required program `$program' is not executable, ",
                   "edit $0.\n";
              $ok = 0;
            }
        }
      else
        {
          warn "$0: required program `$program' does not exist, edit $0.\n";
          $ok = 0;
        }
    }
  exit 1 unless $ok;
}

sub usage()
{
    # More features to add:
    # --diff N:M to produce a diff between revisions
    # --bugs CLI method to add bug number to the commit message
    # --mesg CLI methos to add the commit message
    # --create-branch to create a branch
    # --create-tag to create a tag
    # --switch to switch between branches/tags
	print "Usage: $0 <-g | -p | -f> [-r revision | -b branch | -t tag] <destination>\n";
	print " Operations:\n";
	print "   -g           Get Operation\n";
	print "   -p           Put Operation\n";
	print "   -f[tar|diff] FTP Operation, retrieve latest tar or diff\n";
	print " Selector:\n";
	print "   -r revision  Retrieve by revision number\n";
	print "   -b branch    Retrieve by branch name\n";
	print "   -t tag       Retrieve by tag name\n";
	print " Destination:\n";
	print "   The working copy to perform the operation in or to. The script will \n";
	print "   try to guess where that is, unless you provide a specific path.\n";
	exit;
}

sub banner() {

    print "Anope Source Managemnt Utility - Version $myver\n\n";

}

sub getans {
    my $ans;
    while (! (($ans =~ /y/) || ($ans =~ /n/))) {
        print "*** Ready to continue? (y/n): ";
        $ans = <STDIN>;
        chomp($ans);
        $ans = lc($ans);
        # $ans = &getans();
    }

    # return $ans;
    return ($ans eq "y") ? 1 : 0
}

sub find_conflict() {

    my $filename=shift;
    my $retval=0;
    open (IN2, "$filename") || die "Can't open $filename\n";
    while (<IN2>) {
        if (/^<<<<<<</) {
            $retval=1;
        }
    }
    close(IN2);

    return $retval;
}

sub do_ftp() {

    my $ftpc;
    $ftpc = Net::FTP->new("ftp.zero.org");
    $ftpc->login("ftp","-anonymou@");
    $ftpc->cwd("/incoming");

    if ( lc($ftp) eq "tar" ) {
        print "Retrieving latest tar ball...\n";
        $ftpc->get("anope.tgz");
    } elsif ( lc($ftp) eq "diff" ) {
        print "Retrieving latest patch file...\n";
        $ftpc->get("anope.diff");
    } else {
        print "Unknown type $ftp, aborting...\n";
    }
    $ftpc->quit();
}

sub do_get() {

    my $options  = "" ; # Options to be passed to the svn command
    my $selector = "" ; # Selector to be passed to the svn command

    if ($rev) {
        $options .= "-r $rev";
        $selector = "trunk";
        $copy     = $copy . "-$rev";
    } elsif ($tag) {
        $selector = "tags/$tag";
        $copy     = $copy . "-$tag";
    } elsif ($branch) {
        $selector = "branches/$branch";
        $copy     = $copy . "-$branch";
    } else {
        $selector = "trunk";
    }
    
    if ($dst eq undef) {
        my $cwd = &Cwd::cwd();
        if (-f "$cwd/$fhint") {
            system("$svn update $options $cwd");
        } elsif (-f "$cwd/$copy/$fhint") {
            system("$svn update $options $cwd/$copy");
        } else {
            system("$svn checkout $svnroot/$selector $options $cwd/$copy");
        }
    } else {
        $dst = &Cwd::cwd() if ($dst eq "\.") ;
        if (-f "$dst/$fhint") {
            system("$svn update $options $dst");
        } else {
            system("$svn checkout $svnroot/$selector $options $dst");
        }
    }
}

sub do_put() {

    if ($dst eq undef) {
        my $cwd = &Cwd::cwd();
        if (-f "$cwd/$fhint") {
            $dst = "$cwd";
        } elsif (-f "$cwd/$copy/$fhint") {
            $dst .= "$cwd/$copy";
        } else {
            print "Error: Unable to determine your working copy location.\n";
            exit;
        }
    } else {
        $dst = &Cwd::cwd() if ($dst eq "\.") ;
        if (! -f "$dst/$fhint") {
            print "Error: Unable to determine your working copy location.\n";
            exit;
        }
    }

    # Check to see if we need to update our working copy first.
    my $nupdate;
    open (IN, "$svn status --show-updates --verbose $dst|");
    while (<IN>) {
        if (/\*/) {
            $nupdate .= "$_";
        }
    }
    close(IN);

    if ($nupdate ne undef) {
            print "*** Warning: There are files modified in the repository that need\n";
            print "*** to be merged back to your working copy before the commit can\n";
            print "*** take place. These files are:\n";
            print $nupdate;
            print "Please use: $0 -g $dst\n";
            exit;
    }

    # Get a prelim diff of the changes...
    my $dcount=0;
    my $conflict;
    # open (IN, "$svn diff $dst|");
    open (IN, "$svn status $dst|");
    while (<IN>) {
        if (!/^\?/) {
            $dcount++;
        }

        if (/^C/) {
            $_ =~ s/^C\s+//;
            chomp($_);
            # I don't want to use grep. But my find_conflict sub
            # does not seem to work :( Too bad
            if (`grep "^<<<<<<<" $_`) {
                $conflict .= "$_\n" ;
            } else {
                system("$svn resolved $_");
            }
        }
    }
    close(IN);

    if ($dcount == 0) {
            print "*** Warning: There are no modified files to be commited. Are you\n";
            print "*** sure you are in the right working copy? Verify changes with:\n";
            print "*** $svn diff $dst\n";
            exit;
    }

    if ($conflict ne undef) {
            print "*** Warning: There are merge conflicts to be resolved! Please take\n";
            print "*** a look at the following files and resolve them manually:\n\n";
            print "$conflict\n";
            exit;
    }

    $ctrlfile = "$dst/$fhint";
    # Grab the current revision number. Clunky way, I know!
    $ver_revision=`$wget -qO - $svnrev`;
    chomp($ver_revision);

        unless ($ver_revision =~ /^\d+/ and $ver_revision > 0)
        {
            print "*** Error: Got bogus result $ver_revision from $svnrev.\n";
            exit;
        }

    $ver_revision++;
    open (REV, "$ctrlfile") || die "Can't open $ctrlfile\n";
    while (<REV>) {
        push (@source, $_);
        $ver_major = $_ if (/VERSION_MAJOR/);
        $ver_minor = $_ if (/VERSION_MINOR/);
        $ver_patch = $_ if (/VERSION_PATCH/);
        $ver_build = $_ if (/VERSION_BUILD/);
    }
    close(REV);

    my $junk;
    ($junk, $ver_major) = split('"', $ver_major);
    ($junk, $ver_minor) = split('"', $ver_minor);
    ($junk, $ver_patch) = split('"', $ver_patch);
    ($junk, $ver_build) = split('"', $ver_build);

    $cver = "$ver_major.$ver_minor.$ver_patch ($ver_build)";
    $nver = "$ver_major.$ver_minor.$ver_patch ($ver_revision)";

    # Greet the developer
    banner();
    print "*** Repository   : $svnroot \n";
    print "*** Working copy : $dst \n" ;
    print "*** Current ver. : $cver \n";
    print "*** Updated ver. : $nver \n";
    print "*** Files Changed: $dcount (before indent and version change)\n";
    die ("Aborting...\n") unless &getans();

    # Need to add a clause for -c "comment" and -b "buglist"

    # Get developers input for commit
    $tmpfile=".commit";
    open (OUT, ">$tmpfile") or die ("*** Error! Unable to open $tmpfile file\n");
    print OUT "# Anope commit utility. Please use this template for your commits. 
# Add Bugzilla bugs separated by spaces. The note part is free form.
BUILD : $nver
BUGS  : 
NOTES : ";
    close(OUT);

    system("$editor $tmpfile");

    my $tmp_comment="";
    $ver_comment="#\n";
    $svn_comment="";
    open (IN, "$tmpfile") or die ("*** Error! Unable to open $tmpfile file\n");
    while (<IN>) {
        if ( !/^#/) {
            $tmp_comment.="$_";
            chomp($_);
            $_ =~ s/\t/        /g;
            $ver_comment.="# $_\n";
            $svn_comment.="$_ ";
        }
    }
    close(IN);

    $svn_comment =~ s/\s\s+/ /g;
    # Confirm the commit one last time...
    print "*** Ready to commit, please verify:\n";
    print "\n$tmp_comment\n";

    die ("Aborting...\n") unless &getans();

    print "*** Running Indent...\n";
    system("indent -kr -nut *.c");
    system("rm -f *~");

    print "*** Bumping the revision number...\n";
    # Re-write the control file
    open(OUT, ">$ctrlfile") or die ("*** Error! Unable to open $ctrlfile ... aborting");
    foreach (@source) {
        if (/^VERSION_BUILD/) {
            $_ =~ s/\"\d+\"/\"$ver_revision\"/;
        } elsif (/# \$Log\$/) {
            $_ .= "$ver_comment";
        }
        print OUT $_;
    }
    close(OUT);

    print "*** Starting the upload...\n\n";
    my $rval=system("$svn commit $dst --message '$svn_comment'");
    if ( $rval ) {
            print "*** Error: Unable to complete commit. Rolling back....\n\n";
            system("$svn revert $ctrlfile");
    }

}

{
	usage() if (! @ARGV);

    my $opt = 'hgpf:r:b:t:';
    getopts ("$opt", \%opt) or usage();
	usage() if $opt{h};

    usage() if ($opt{g} && $opt{p});
    usage() if ($opt{g} && $opt{f});
    usage() if ($opt{p} && $opt{f});
    usage() if ($opt{r} && $opt{b});
    usage() if ($opt{r} && $opt{t});
    usage() if ($opt{b} && $opt{t});

    $rev    = $opt{r} ;
    $branch = $opt{b} ;
    $tag    = $opt{t} ;
    $ftp    = $opt{f} ;
    $dst    = shift;

    if ($rev ne undef) {
        unless ($rev =~ /^\d+/ and $rev > 0)
        {
            print "*** Error: Revision number '$rev' must be an integer > 0.\n";
            exit;
        }
    }

    do_ftp() if $opt{f};
    do_get() if $opt{g};
    do_put() if $opt{p};
    print "*** Done!\n";

}