handleconfig.pm

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package CPAN::HandleConfig;
use strict;
use vars qw(%can %keys $loading $VERSION);

$VERSION = sprintf "%.6f", substr(q$Rev: 2212 $,4)/1000000 + 5.4;

%can = (
        commit   => "Commit changes to disk",
        defaults => "Reload defaults from disk",
        help     => "Short help about 'o conf' usage",
        init     => "Interactive setting of all options",
);

# Q: where is the "How do I add a new config option" HOWTO?
# A1: svn diff -r 757:758 # where dagolden added test_report
# A2: svn diff -r 985:986 # where andk added yaml_module
%keys = map { $_ => undef }
    (
     "applypatch",
     "auto_commit",
     "build_cache",
     "build_dir",
     "build_dir_reuse",
     "build_requires_install_policy",
     "bzip2",
     "cache_metadata",
     "check_sigs",
     "colorize_debug",
     "colorize_output",
     "colorize_print",
     "colorize_warn",
     "commandnumber_in_prompt",
     "commands_quote",
     "cpan_home",
     "curl",
     "dontload_hash", # deprecated after 1.83_68 (rev. 581)
     "dontload_list",
     "ftp",
     "ftp_passive",
     "ftp_proxy",
     "getcwd",
     "gpg",
     "gzip",
     "histfile",
     "histsize",
     "http_proxy",
     "inactivity_timeout",
     "index_expire",
     "inhibit_startup_message",
     "keep_source_where",
     "load_module_verbosity",
     "lynx",
     "make",
     "make_arg",
     "make_install_arg",
     "make_install_make_command",
     "makepl_arg",
     "mbuild_arg",
     "mbuild_install_arg",
     "mbuild_install_build_command",
     "mbuildpl_arg",
     "ncftp",
     "ncftpget",
     "no_proxy",
     "pager",
     "password",
     "patch",
     "prefer_installer",
     "prefs_dir",
     "prerequisites_policy",
     "proxy_pass",
     "proxy_user",
     "randomize_urllist",
     "scan_cache",
     "shell",
     "show_unparsable_versions",
     "show_upload_date",
     "show_zero_versions",
     "tar",
     "tar_verbosity",
     "term_is_latin",
     "term_ornaments",
     "test_report",
     "unzip",
     "urllist",
     "use_sqlite",
     "username",
     "wait_list",
     "wget",
     "yaml_load_code",
     "yaml_module",
    );

my %prefssupport = map { $_ => 1 }
    (
     "build_requires_install_policy",
     "check_sigs",
     "make",
     "make_install_make_command",
     "prefer_installer",
     "test_report",
    );

if ($^O eq "MSWin32") {
    for my $k (qw(
                  mbuild_install_build_command
                  make_install_make_command
                 )) {
        delete $keys{$k};
        if (exists $CPAN::Config->{$k}) {
            for ("deleting previously set config variable '$k' => '$CPAN::Config->{$k}'") {
                $CPAN::Frontend ? $CPAN::Frontend->mywarn($_) : warn $_;
            }
            delete $CPAN::Config->{$k};
        }
    }
}

# returns true on successful action
sub edit {
    my($self,@args) = @_;
    return unless @args;
    CPAN->debug("self[$self]args[".join(" | ",@args)."]");
    my($o,$str,$func,$args,$key_exists);
    $o = shift @args;
    $DB::single = 1;
    if($can{$o}) {
        $self->$o(args => \@args); # o conf init => sub init => sub load
        return 1;
    } else {
        CPAN->debug("o[$o]") if $CPAN::DEBUG;
        unless (exists $keys{$o}) {
            $CPAN::Frontend->mywarn("Warning: unknown configuration variable '$o'\n");
        }
        my $changed;


        # one day I used randomize_urllist for a boolean, so we must
        # list them explicitly --ak
        if (0) {
        } elsif ($o =~ /^(wait_list|urllist|dontload_list)$/) {

            #
            # ARRAYS
            #

            $func = shift @args;
            $func ||= "";
            CPAN->debug("func[$func]args[@args]") if $CPAN::DEBUG;
            # Let's avoid eval, it's easier to comprehend without.
            if ($func eq "push") {
                push @{$CPAN::Config->{$o}}, @args;
                $changed = 1;
            } elsif ($func eq "pop") {
                pop @{$CPAN::Config->{$o}};
                $changed = 1;
            } elsif ($func eq "shift") {
                shift @{$CPAN::Config->{$o}};
                $changed = 1;
            } elsif ($func eq "unshift") {
                unshift @{$CPAN::Config->{$o}}, @args;
                $changed = 1;
            } elsif ($func eq "splice") {
                my $offset = shift @args || 0;
                my $length = shift @args || 0;
                splice @{$CPAN::Config->{$o}}, $offset, $length, @args; # may warn
                $changed = 1;
            } elsif ($func) {
                $CPAN::Config->{$o} = [$func, @args];
                $changed = 1;
            } else {
                $self->prettyprint($o);
            }
            if ($changed) {
                if ($o eq "urllist") {
                    # reset the cached values
                    undef $CPAN::FTP::Thesite;
                    undef $CPAN::FTP::Themethod;
                    $CPAN::Index::LAST_TIME = 0;
                } elsif ($o eq "dontload_list") {
                    # empty it, it will be built up again
                    $CPAN::META->{dontload_hash} = {};
                }
            }
        } elsif ($o =~ /_hash$/) {

            #
            # HASHES
            #

            if (@args==1 && $args[0] eq "") {
                @args = ();
            } elsif (@args % 2) {
                push @args, "";
            }
            $CPAN::Config->{$o} = { @args };
            $changed = 1;
        } else {

            #
            # SCALARS
            #

            if (defined $args[0]) {
                $CPAN::CONFIG_DIRTY = 1;
                $CPAN::Config->{$o} = $args[0];
                $changed = 1;
            }
            $self->prettyprint($o)
                if exists $keys{$o} or defined $CPAN::Config->{$o};
        }
        if ($changed) {
            if ($CPAN::Config->{auto_commit}) {
                $self->commit;
            } else {
                $CPAN::CONFIG_DIRTY = 1;
                $CPAN::Frontend->myprint("Please use 'o conf commit' to ".
                                         "make the config permanent!\n\n");
            }
        }
    }
}

sub prettyprint {
    my($self,$k) = @_;
    my $v = $CPAN::Config->{$k};
    if (ref $v) {
        my(@report);
        if (ref $v eq "ARRAY") {
            @report = map {"\t$_ \[$v->[$_]]\n"} 0..$#$v;
        } else {
            @report = map
                {
                    sprintf "\t%-18s => %s\n",
                               "[$_]",
                                        defined $v->{$_} ? "[$v->{$_}]" : "undef"
                } keys %$v;
        }
        $CPAN::Frontend->myprint(
                                 join(
                                      "",
                                      sprintf(
                                              "    %-18s\n",
                                              $k
                                             ),
                                      @report
                                     )
                                );
    } elsif (defined $v) {
        $CPAN::Frontend->myprint(sprintf "    %-18s [%s]\n", $k, $v);
    } else {
        $CPAN::Frontend->myprint(sprintf "    %-18s undef\n", $k);
    }
}

sub commit {
    my($self,@args) = @_;
    CPAN->debug("args[@args]") if $CPAN::DEBUG;
    if ($CPAN::RUN_DEGRADED) {
                             $CPAN::Frontend->mydie(
                                                    "'o conf commit' disabled in ".
                                                    "degraded mode. Maybe try\n".
                                                    " !undef \$CPAN::RUN_DEGRADED\n"
                                                   );
    }
    my $configpm;
    if (@args) {
      if ($args[0] eq "args") {
        # we have not signed that contract
      } else {
        $configpm = $args[0];
      }
    }
    unless (defined $configpm) {
        $configpm ||= $INC{"CPAN/MyConfig.pm"};
        $configpm ||= $INC{"CPAN/Config.pm"};
        $configpm || Carp::confess(q{
CPAN::Config::commit called without an argument.
Please specify a filename where to save the configuration or try
"o conf init" to have an interactive course through configing.
});
    }
    my($mode);
    if (-f $configpm) {
        $mode = (stat $configpm)[2];
        if ($mode && ! -w _) {
            Carp::confess("$configpm is not writable");
        }
    }

    my $msg;
    $msg = <<EOF unless $configpm =~ /MyConfig/;

# This is CPAN.pm's systemwide configuration file. This file provides
# defaults for users, and the values can be changed in a per-user
# configuration file. The user-config file is being looked for as
# ~/.cpan/CPAN/MyConfig.pm.

EOF
    $msg ||= "\n";
    my($fh) = FileHandle->new;
    rename $configpm, "$configpm~" if -f $configpm;
    open $fh, ">$configpm" or
        $CPAN::Frontend->mydie("Couldn't open >$configpm: $!");
    $fh->print(qq[$msg\$CPAN::Config = \{\n]);
    foreach (sort keys %$CPAN::Config) {
        unless (exists $keys{$_}) {
            # do not drop them: forward compatibility!
            $CPAN::Frontend->mywarn("Unknown config variable '$_'\n");
            next;
        }
        $fh->print(
            "  '$_' => ",
            $self->neatvalue($CPAN::Config->{$_}),
            ",\n"
        );
    }

    $fh->print("};\n1;\n__END__\n");
    close $fh;

    #$mode = 0444 | ( $mode & 0111 ? 0111 : 0 );
    #chmod $mode, $configpm;
###why was that so?    $self->defaults;
    $CPAN::Frontend->myprint("commit: wrote '$configpm'\n");
    $CPAN::CONFIG_DIRTY = 0;
    1;
}

# stolen from MakeMaker; not taking the original because it is buggy;
# bugreport will have to say: keys of hashes remain unquoted and can
# produce syntax errors
sub neatvalue {
    my($self, $v) = @_;
    return "undef" unless defined $v;
    my($t) = ref $v;
    unless ($t) {
        $v =~ s/\\/\\\\/g;
        return "q[$v]";
    }
    if ($t eq 'ARRAY') {
        my(@m, @neat);
        push @m, "[";
        foreach my $elem (@$v) {
            push @neat, "q[$elem]";
        }
        push @m, join ", ", @neat;
        push @m, "]";
        return join "", @m;
    }
    return "$v" unless $t eq 'HASH';
    my(@m, $key, $val);
    while (($key,$val) = each %$v) {
        last unless defined $key; # cautious programming in case (undef,undef) is true
        push(@m,"q[$key]=>".$self->neatvalue($val)) ;
    }
    return "{ ".join(', ',@m)." }";
}

sub defaults {