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lots more commands.  Getting close.

#!/usr/bin/perl
# $RedRiver: todo.pl,v 1.2 2010/01/10 07:13:54 andrew Exp $
########################################################################
# todo.pl *** a perl version of todo.sh. Uses Text::Todo.
#
# 2010.01.07 #*#*# andrew fresh <andrew@cpan.org>
########################################################################
# Copyright 2010 Andrew Fresh, all rights reserved
#
# This program is free software; you can redistribute it and/or modify
# it under the same terms as Perl itself.
########################################################################
use strict;
use warnings;

use Data::Dumper;

use Getopt::Std;
use Text::Todo;

use version; our $VERSION = qv('0.0.1');

# option defaults
my $config_file = $ENV{HOME} . '/todo.cfg';
CONFIG: foreach my $f ( $config_file, $ENV{HOME} . '/.todo.cfg', ) {
    if ( -e $f ) {
        $config_file = $f;
        last CONFIG;
    }
}

my %actions = (
    add      => \&add,
    addto    => \&addto,
    append   => \&append,
    archive  => \&archive,
    command  => \&command,
    del      => \&del,
    depri    => \&depri,
    do       => \&mark_done,
    help     => \&help,
    list     => \&list,
    listall  => \&listall,
    listcon  => \&listcon,
    listfile => \&listfile,
    listpri  => \&listpri,
    listproj => \&listproj,
    move     => \&move,
    prepend  => \&prepend,
    pri      => \&pri,
    replace  => \&replace,
    report   => \&report,
);

my %aliases = (
    a     => 'add',
    app   => 'append',
    rm    => 'del',
    dp    => 'depri',
    ls    => 'list',
    lsa   => 'listall',
    lsc   => 'listcon',
    lf    => 'listfile',
    lsp   => 'listpri',
    lsprj => 'listproj',
    mv    => 'move',
    prep  => 'prepend',
    p     => 'pri',
);

my %opts;
getopts( '@+d:fhpPntvV', \%opts );

my $action = shift @ARGV;
if ( $action && $action eq 'command' ) {

    # We don't support action scripts so . . .
    $action = shift @ARGV;
}
if ( $action && exists $aliases{$action} ) {
    $action = $aliases{$action};
}

if ( $opts{h} || !$action ) {
    usage( $opts{h} );
}

my @unsupported = grep { defined $opts{$_} } qw( @ + f h p P n t v V );
if (@unsupported) {
    warn 'Unsupported options: ' . ( join q{, }, @unsupported ) . "\n";
}

if ( $opts{d} ) {
    $config_file = $opts{d};
}

if ( exists $actions{$action} ) {
    my $config = read_config($config_file);
    my $action = $actions{$action}->( $config, @ARGV );
}
else {
    usage();
}

sub add {
    my ( $config, $entry ) = @_;
    if ( !$entry ) {
        die "usage: todo.pl add 'item'\n";
    }

    my $todo = Text::Todo->new($config);
    if ( $todo->add($entry) ) {
        my @list  = $todo->list;
        my $lines = scalar @list;

        print "TODO: '$entry' added on line $lines\n";

        return $lines;
    }
    die "Unable to add [$entry]\n";
}

sub addto {
    my ( $config, $file, $entry ) = @_;
    if ( !( $file && $entry ) ) {
        die "usage: todo.pl addto DEST 'TODO ITEM'\n";
    }

    my $todo = Text::Todo->new($config);

    $file = $todo->file($file);
    if ( $todo->addto( $file, $entry ) ) {
        my @list  = $todo->listfile($file);
        my $lines = scalar @list;

        print "TODO: '$entry' added to $file on line $lines\n";

        return $lines;
    }
    die "Unable to add [$entry]\n";
}

sub append    { return &unsupported }
sub archive   { return &unsupported }
sub command   { return &unsupported }
sub del       { return &unsupported }
sub depri     { return &unsupported }
sub mark_done { return &unsupported }
sub help      { return &unsupported }

sub list {
    my ( $config, $term ) = @_;
    my $todo = Text::Todo->new($config);

    my @list = _number_list( $todo->list );
    my $shown = _show_sorted_list( $term, @list );

    return _show_list_footer( $shown, scalar @list, $config->{todo_file} );
}

sub listall {
    my ( $config, $term ) = @_;
    my $todo = Text::Todo->new($config);

    my @list = _number_list(
        $todo->listfile('todo_file'),
        $todo->listfile('done_file'),
    );
    my $shown = _show_sorted_list( $term, @list );

    return _show_list_footer( $shown, scalar @list, $config->{'todo_dir'} );
}

sub listcon {
    my ($config) = @_;
    my $todo = Text::Todo->new($config);
    return print map {"\@$_\n"} $todo->listcon;
}

sub listfile {
    my ( $config, $file, $term ) = @_;
    if ( !$file ) {
        die "usage: todo.pl listfile SRC [TERM]\n";
    }
    my $todo = Text::Todo->new($config);

    my @list = _number_list( $todo->listfile($file) );
    my $shown = _show_sorted_list( $term, @list );

    return _show_list_footer( $shown, scalar @list, $file );
}

sub listpri {
    my ( $config, $pri ) = @_;

    my $todo = Text::Todo->new($config);

    my @list = _number_list( $todo->listfile('todo_file') );
    my @pri_list;
    if ($pri) {
        $pri = uc $pri;
        if ( $pri !~ /^[A-Z]$/xms ) {
            die "usage: todo.pl listpri PRIORITY\n",
                "note: PRIORITY must a single letter from A to Z.\n";
        }
        @pri_list = grep {
            defined $_->{entry}->priority
                && $_->{entry}->priority eq $pri
        } @list;
    }
    else {
        @pri_list = grep { $_->{entry}->priority } @list;
    }

    my $shown = _show_sorted_list( undef, @pri_list );

    return _show_list_footer( $shown, scalar @list, $config->{todo_file} );
}

sub listproj {
    my ($config) = @_;
    my $todo = Text::Todo->new($config);
    return print map {"\+$_\n"} $todo->listproj;
}

sub move    { return &unsupported }
sub prepend { return &unsupported }
sub pri     { return &unsupported }
sub replace { return &unsupported }
sub report  { return &unsupported }

sub _number_list {
    my (@list) = @_;

    my $line = 1;
    return map { { line => $line++, entry => $_, } } @list;
}

sub _show_sorted_list {
    my ( $term, @list ) = @_;
    $term = defined $term ? quotemeta($term) : '';

    my $shown = 0;
    foreach my $e (
        sort { lc $a->{entry}->text cmp lc $b->{entry}->text }
        grep { $_->{entry}->text =~ /$term/xms } @list
        )
    {
        printf "%02d %s\n", $e->{line}, $e->{entry}->text;
        $shown++;
    }

    return $shown;
}

sub _show_list_footer {
    my ( $shown, $total, $file ) = @_;

    $shown ||= 0;
    $total ||= 0;

    print "-- \n";
    print "TODO: $shown of $total tasks shown from $file\n";

    return 1;
}

sub unsupported { die "Unsupported action\n" }

sub usage {
    my ($long) = @_;

    print <<'EOL';
  * command list taken from todo.sh for compatibility
  Usage: todo.pl [-fhpantvV] [-d todo_config] action
EOL

    if ($long) {
        print <<'EOL';

  Actions:
    add|a "THING I NEED TO DO +project @context"
    addto DEST "TEXT TO ADD"
    append|app NUMBER "TEXT TO APPEND"
    archive
    command [ACTIONS]
    del|rm NUMBER [TERM]
    dp|depri NUMBER
    do NUMBER
    help
    list|ls [TERM...]
    listall|lsa [TERM...]
    listcon|lsc
    listfile|lf SRC [TERM...]
    listpri|lsp [PRIORITY]
    listproj|lsprj
    move|mv NUMBER DEST [SRC]
    prepend|prep NUMBER "TEXT TO PREPEND"
    pri|p NUMBER PRIORITY
    replace NUMBER "UPDATED TODO"
    report
EOL
    }
    else {
        print <<'EOL';
Try 'todo.pl -h' for more information.
EOL
    }

    exit;
}

sub read_config {
    my ($file) = @_;

    my %config;
    open my $fh, '< ', $file or die "Unable to open [$file]: $!";
LINE: while (<$fh>) {
        s/\r?\n$//xms;
        s/\s*\#.*$//xms;
        next LINE unless $_;

        if (s/^\s*export\s+//xms) {
            my ( $key, $value ) = /^([^=]+)\s*=\s*"?(.*?)"?\s*$/xms;
            if ($key) {
                foreach my $k ( keys %config ) {
                    $value =~ s/\$\Q$k\E/$config{$k}/gxms;
                    $value =~ s/\${\Q$k\E}/$config{$k}/gxms;
                }
                foreach my $k ( keys %ENV ) {
                    $value =~ s/\$\Q$k\E/$ENV{$k}/gxms;
                    $value =~ s/\${\Q$k\E}/$ENV{$k}/gxms;
                }
                $value =~ s/\$\w+//gxms;
                $value =~ s/\${\w+}//gxms;

                $config{$key} = $value;
            }
        }
    }
    close $fh;

    my %lc_config;
    foreach my $k ( keys %config ) {
        $lc_config{ lc($k) } = $config{$k};
    }

    return \%lc_config;
}