/[iselect]/ISelect.pm
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Contents of /ISelect.pm

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Revision 14 - (show annotations)
Thu Oct 25 17:24:33 2007 UTC (11 years, 11 months ago) by dpavlin
File size: 6277 byte(s)
continue move to OO land.
1 package Term::ISelect;
2
3 use warnings;
4 use strict;
5
6 use Term::Screen;
7 use Carp qw/cluck confess/;
8 use Data::Dump qw/dump/;
9
10 use base qw/Class::Accessor/;
11 __PACKAGE__->mk_accessors( qw/
12 screen
13 lines
14 error_text
15 status_text
16
17 debug
18 / );
19
20
21 our $VERSION = '0.01';
22
23 =head1 NAME
24
25 Term::ISelect - perl only implementation of Interactive Terminal Selection
26
27 =head1 METHODS
28
29 =head2 new
30
31 my $iselect = Term::ISelect->new({
32 lines => [
33 'first line',
34 '{s}second selectable line',
35 '',
36 'last line',
37 ],
38 debug => 1
39 });
40
41 =head2 open_screen
42
43 $iselect->open_screen;
44
45 =cut
46
47 # leave sane terminal if script dies
48 $SIG{__DIE__} = sub {
49 eval { system('stty sane'); };
50 };
51
52 sub open_screen {
53 my $self = shift;
54 $self->screen( new Term::Screen );
55 }
56
57 my $top_screen_line = 0; # offset in original text
58 my $pos = 0;
59
60 # default: select first line
61 my $sel_pos = 0;
62
63 my $status_lines = 3;
64
65 my $selectable_line;
66
67 =head2 full_line
68
69 Returns line padded up to screen width
70
71 $iselect->full_line( "foo bar" );
72
73 =cut
74
75 sub full_line {
76 my $self = shift;
77
78 my $cols = $self->screen->cols;
79
80 my $t = shift;
81 $t = '' unless defined $t;
82 $t = substr($t,0,$cols) if length($t) > $cols;
83 return $t . (" " x ($cols - length($t)));
84 }
85
86
87 =head2 redraw_line
88
89 $iselect->redraw_line( $line_on_screen, $content_of_line );
90
91 =cut
92
93 sub redraw_line {
94 my $self = shift;
95
96 my ($l,$line) = @_;
97
98 if ( defined $selectable_line->{ $l + $top_screen_line } ) {
99 $self->screen->at($l,0)->bold()->puts( $self->full_line( $line ) )->normal();
100 } else {
101 $self->screen->at($l,0)->puts( $self->full_line( $line ) )
102 }
103 }
104
105 =head2 redraw_screen
106
107 $iselect->redraw_screen
108
109 =cut
110
111 sub redraw_screen {
112 my $self = shift;
113 my @lines = $self->lines;
114 for my $l (0 .. $self->screen->rows - $status_lines) {
115 my $line = $lines[ $l + $top_screen_line ];
116 $self->redraw_line( $l, $line );
117 last if ($l == $#lines);
118 }
119 $self->selected;
120 }
121
122 =head2 redraw_statusline
123
124 Redraw status line
125
126 $iselect->redraw_statusline;
127
128 =cut
129
130 sub redraw_statusline {
131 my $self = shift;
132
133 my @lines = $self->lines;
134
135 my $pcnt = int(($pos || 0) * 100 / ( $#lines || 1));
136 my $pos_txt = sprintf('%d, %d%% ',$pos,$pcnt);
137
138 my $scr = $self->screen || confess "need screen";
139
140 $scr->at($scr->rows - $status_lines + 1,0)->reverse()->puts(
141 sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$self->status_text)
142 .$pos_txt)->normal() if $self->status_text;
143
144 $scr->at($scr->rows - $status_lines + 2,0)->puts(
145 sprintf('%-'.$scr->cols.'s', $self->error_text)
146 ) if $self->error_text;
147 }
148
149 =head2 selected
150
151 Move selection (or refresh it)
152
153 $iselect->selected( +1 );
154 $iselect->selected( -1 );
155 $iselect->selected( 0 );
156
157 =cut
158
159 sub selected {
160 my $self = shift;
161
162 my $d = shift || 0;
163
164 my $screen_line = $pos - $top_screen_line;
165
166 $self->redraw_line( $screen_line, ($self->lines)[$pos] );
167
168 my $last_screen_line = $self->screen->rows - $status_lines;
169
170 if ( $d < 0 && $screen_line == 0 ) {
171 if ( $pos > 0 ) {
172 $top_screen_line--;
173 $pos--;
174 } else {
175 $self->error_text( "Already at Begin." );
176 }
177 $self->redraw_screen;
178 } elsif ( $d > 0 && $screen_line == $last_screen_line ) {
179 if ( $pos < scalar($self->lines) ) {
180 $top_screen_line++;
181 $pos++;
182 } else {
183 $self->error_text( "Already at End." );
184 }
185 $self->redraw_screen;
186 } else {
187 $pos += $d;
188 }
189
190 my $line = ($self->lines)[$pos];
191 if ( defined $selectable_line->{ $pos } ) {
192 $self->screen->at($pos - $top_screen_line,0)->reverse->bold()->puts( $self->full_line( $line ) )->normal();
193 $sel_pos = $pos;
194 } else {
195 $self->screen->at($pos - $top_screen_line,0)->reverse->puts( $self->full_line( $line ) );
196 $sel_pos = -1;
197 }
198 $self->redraw_statusline;
199 }
200
201
202 =head2 loop
203
204 $iselect->loop(
205 sub {
206 my $line = shift;
207 warn "got line: $line\n";
208 }
209 );
210
211 =cut
212
213 sub loop {
214 my $self = shift;
215
216 my $callback = shift;
217 confess "expect callback as first arg" unless ref($callback) eq 'CODE';
218
219 my @lines = $self->lines;
220
221 # find which lines are selectable in input file
222 for my $l (0 .. $#lines) {
223 if ($lines[$l] =~ s/^{s}//) {
224 $selectable_line->{$l}++;
225 }
226 }
227
228 # select first selectable line
229 if ( $selectable_line ) {
230 $pos = $sel_pos = (sort { $a <=> $b } keys %$selectable_line)[0];
231 warn "selected first selectable line $sel_pos";
232 }
233
234 $self->open_screen unless $self->screen;
235
236 $self->screen->clrscr()->noecho();
237 $self->redraw_screen;
238 $self->selected;
239
240 while(my $key = $self->screen->getch()) {
241
242 my $lines_on_screen = $self->screen->rows - $status_lines;
243
244 if ($key eq 'ku') {
245 $self->selected( -1 );
246 } elsif ($key eq 'kd') {
247 $self->selected( +1 );
248 } elsif ($key eq 'pgup' ) {
249 # first line on screen?
250 if ( $pos == $top_screen_line ) {
251 $top_screen_line -= $lines_on_screen;
252 $top_screen_line = 0 if $top_screen_line < 0;
253 $self->redraw_screen;
254 }
255 $self->selected( -( $pos - $top_screen_line ) );
256 } elsif ($key eq 'pgdn' ) {
257 # last line on screen?
258 if ( $pos - $top_screen_line == $lines_on_screen ) {
259 $top_screen_line += $lines_on_screen;
260 $top_screen_line = $#lines - $lines_on_screen if $top_screen_line >= $#lines - $lines_on_screen;
261 $self->redraw_screen;
262 }
263 $self->selected( $top_screen_line + $lines_on_screen - $pos );
264 }
265
266 my $status_text = sprintf("pos: %-3d sel_pos: %-3d top_screen_line: %-3d", $pos, $sel_pos, $top_screen_line );
267 if ( length($key) > 1 ) {
268 $status_text .= " key: $key";
269 } else {
270 $status_text .= sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) );
271 }
272 $self->status_text( $status_text );
273
274 # CTRL+L
275 $self->redraw_screen if ord($key) eq 0x0c;
276
277 # Enter
278 if ( ord($key) eq 0x0d && $sel_pos > 0 ) {
279 $self->error_text( "execute: " . $lines[ $sel_pos ] );
280 }
281
282 return if (lc($key) eq 'q');
283
284 $self->redraw_statusline;
285
286 }
287
288 $self->clrscr();
289 }
290
291 =head1 SEE ALSO
292
293 L<http://www.ossp.org/pkg/tool/iselect/> - Interactive Terminal Selection
294 written by Ralf S. Engelschall which is original implementation in C
295
296 =head1 AUTHOR
297
298 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
299
300 =head1 COPYRIGHT & LICENSE
301
302 Copyright 2006-2007 Dobrica Pavlinusic, All Rights Reserved.
303
304 This program is free software; you can redistribute it and/or modify it
305 under the same terms as Perl itself.
306
307 =cut
308
309 1;

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