From 054458db9296b3f6e18452f3ebcf8406ab567c8c Mon Sep 17 00:00:00 2001
From: Tom Feist <shabble@metavore.org>
Date: Thu, 14 Apr 2011 07:30:59 +0100
Subject: undo.pl: new script which stores short-term history (ie: within one
 command), and allows you to undo with C-\.

---
 undo/undo.pl | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 undo/undo.pl

diff --git a/undo/undo.pl b/undo/undo.pl
new file mode 100644
index 0000000..5daa16e
--- /dev/null
+++ b/undo/undo.pl
@@ -0,0 +1,134 @@
+# LICENCE:
+#
+# Copyright (c) 2011 Tom Feist <shabble+irssi@metavore.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+
+# TODO: attempt to create an undo function for short-term history in
+# the input-bar.
+
+use strict;
+use warnings;
+
+use Irssi;
+use Irssi::Irc;
+use Irssi::TextUI;
+
+use Data::Dumper;
+
+our $VERSION = '0.1';
+our %IRSSI = (
+              authors     => 'shabble',
+              contact     => 'shabble+irssi@metavore.org',
+              name        => '',
+              description => '',
+              license     => 'MIT',
+             );
+
+my @undo_list;
+
+sub undo_init {
+    Irssi::signal_add_first('gui key pressed' => \&sig_cmd_undo);}
+}
+
+sub add_to_undo {
+    my ($str, $pos) = @_;
+
+    return unless defined $str and defined $pos;
+
+    my $undo_head = $undo_list[-1];
+
+    if (ref $undo_head) {
+        if ($str ne $undo_head->{str} && $pos != $undo_head->{pos}) {
+            push @undo_list, { str => $str, pos => $pos };
+        }
+    } else {
+        push @undo_list, { str => $str, pos => $pos };
+    }
+
+    # enforce maximum size
+    # TODO: make this a setting?
+
+    if (@undo_list > 100) {
+        shift @undo_list;
+    }
+}
+
+sub sig_cmd_undo {
+    my ($key) = @_;
+
+    if ($key == 10) {
+        @undo_list = ();
+        return;
+    } elsif ($key != 28) {
+        add_to_undo(_input(), _input_pos());
+        return;
+    }
+
+    Irssi::signal_stop();
+
+    my $prev_state = pop @undo_list;
+
+    if (not defined $prev_state) {
+        print "No further undo";
+        return;
+    }
+
+    _input($prev_state->{str});
+    _input_pos($prev_state->{pos});
+}
+
+sub _input {
+    my ($data) = @_;
+
+    my $current_data = Irssi::parse_special('$L', 0, 0);
+
+    # TODO: set this back up.
+
+    # if ($settings->{utf8}->{value}) {
+    #     $current_data = decode_utf8($current_data);
+    # }
+
+    if (defined $data) {
+        # if ($settings->{utf8}->{value}) {
+        #     Irssi::gui_input_set(encode_utf8($data));
+        # } else {
+        Irssi::gui_input_set($data);
+        #}
+    } else {
+        $data = $current_data;
+    }
+
+    return $data;
+}
+
+sub _input_pos {
+    my ($pos) = @_;
+    my $cur_pos = Irssi::gui_input_get_pos();
+    if (defined $pos) {
+        Irssi::gui_input_set_pos($pos) if $pos != $cur_pos;
+    } else {
+        $pos = $cur_pos;
+    }
+
+    return $pos;
+}
+
+undo_init();
-- 
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