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

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Revision 20 - (show annotations)
Thu Oct 25 20:21:43 2007 UTC (11 years, 10 months ago) by dpavlin
File size: 6519 byte(s)
don't redraw screen on error
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 my $nr_lines = 0;
68
69 =head2 full_line
70
71 Returns line padded up to screen width
72
73 $iselect->full_line( "foo bar" );
74
75 =cut
76
77 sub full_line {
78 my $self = shift;
79
80 my $cols = $self->screen->cols;
81
82 my $t = shift;
83
84 $t =~ s/{s}//;
85
86 $t = '' unless defined $t;
87 $t = substr($t,0,$cols) if length($t) > $cols;
88 return $t . (" " x ($cols - length($t)));
89 }
90
91
92 =head2 redraw_line
93
94 $iselect->redraw_line( $line_on_screen, $content_of_line );
95
96 =cut
97
98 sub redraw_line {
99 my $self = shift;
100
101 my ($l,$line) = @_;
102
103 if ( defined $selectable_line->{ $l + $top_screen_line } ) {
104 $self->screen->at($l,0)->bold()->puts( $self->full_line( $line ) )->normal();
105 } else {
106 $self->screen->at($l,0)->puts( $self->full_line( $line ) )
107 }
108 }
109
110 =head2 redraw_screen
111
112 $iselect->redraw_screen
113
114 =cut
115
116 sub redraw_screen {
117 my $self = shift;
118 my @lines = @{ $self->lines };
119 $nr_lines = $#lines;
120 for my $l (0 .. $self->screen->rows - $status_lines) {
121 my $line = $lines[ $l + $top_screen_line ];
122 $self->redraw_line( $l, $line );
123 last if ($l == $#lines);
124 }
125 $self->selected;
126 }
127
128 =head2 redraw_statusline
129
130 Redraw status line
131
132 $iselect->redraw_statusline;
133
134 =cut
135
136 sub redraw_statusline {
137 my $self = shift;
138
139 my $pcnt = int(($pos || 0) * 100 / ( $nr_lines || 1 ) );
140 my $pos_txt = sprintf('%d/%s, %d%% ',$pos,$nr_lines,$pcnt);
141
142 my $scr = $self->screen || confess "need screen";
143
144 my $status_text = sprintf("pos: %-3d sel_pos: %-3d top_screen_line: %-3d", $pos, $sel_pos, $top_screen_line );
145
146 $status_text .= ' ' . $self->status_text if $self->status_text;
147
148 $scr->at($scr->rows - $status_lines + 1,0)->reverse()->puts(
149 sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$status_text)
150 .$pos_txt)->normal();
151
152 $scr->at($scr->rows - $status_lines + 2,0)->puts(
153 sprintf('%-'.$scr->cols.'s', $self->error_text)
154 ) if $self->error_text;
155 }
156
157 =head2 selected
158
159 Move selection (or refresh it)
160
161 $iselect->selected( +1 );
162 $iselect->selected( -1 );
163 $iselect->selected( 0 );
164
165 =cut
166
167 sub selected {
168 my $self = shift;
169
170 my $d = shift || 0;
171
172 my $screen_line = $pos - $top_screen_line;
173
174 $self->redraw_line( $screen_line, $self->lines->[$pos] );
175
176 my $last_screen_line = $self->screen->rows - $status_lines;
177
178 if ( $d < 0 && $screen_line == 0 ) {
179 if ( $pos > 0 ) {
180 $top_screen_line--;
181 $pos--;
182 $self->redraw_screen;
183 } else {
184 $self->error_text( "Already at Begin." );
185 }
186 } elsif ( $d > 0 && $screen_line == $last_screen_line ) {
187 if ( $pos < $nr_lines ) {
188 $top_screen_line++;
189 $pos++;
190 $self->redraw_screen;
191 } else {
192 $self->error_text( "Already at End." );
193 }
194 } else {
195 $pos += $d;
196 }
197
198 my $line = $self->lines->[$pos];
199 if ( defined $selectable_line->{ $pos } ) {
200 $self->screen->at($pos - $top_screen_line,0)->reverse->bold()->puts( $self->full_line( $line ) )->normal();
201 $sel_pos = $pos;
202 } else {
203 $self->screen->at($pos - $top_screen_line,0)->reverse->puts( $self->full_line( $line ) );
204 $sel_pos = -1;
205 }
206 $self->redraw_statusline;
207 }
208
209
210 =head2 loop
211
212 $iselect->loop(
213 sub {
214 my $line = shift;
215 warn "got line: $line\n";
216 }
217 );
218
219 =cut
220
221 sub loop {
222 my $self = shift;
223
224 my $callback = shift;
225 confess "expect callback as first arg" unless ref($callback) eq 'CODE';
226
227 my @lines = @{ $self->lines };
228
229 # find which lines are selectable in input file
230 for my $l (0 .. $#lines) {
231 if ($lines[$l] =~ s/^{s}//) {
232 $selectable_line->{$l}++;
233 }
234 }
235
236 # select first selectable line
237 if ( $selectable_line ) {
238 $pos = $sel_pos = (sort { $a <=> $b } keys %$selectable_line)[0];
239 warn "selected first selectable line $sel_pos";
240 }
241
242 $self->open_screen unless $self->screen;
243
244 $self->screen->clrscr()->noecho();
245 $self->redraw_screen;
246 $self->selected;
247
248 while(my $key = $self->screen->getch()) {
249
250 my $lines_on_screen = $self->screen->rows - $status_lines;
251
252 if ($key eq 'ku') {
253 $self->selected( -1 );
254 } elsif ($key eq 'kd') {
255 $self->selected( +1 );
256 } elsif ($key eq 'pgup' ) {
257 # first line on screen?
258 if ( $pos == $top_screen_line ) {
259 $top_screen_line -= $lines_on_screen;
260 $top_screen_line = 0 if $top_screen_line < 0;
261 $self->redraw_screen;
262 }
263 $self->selected( -( $pos - $top_screen_line ) );
264 } elsif ($key eq 'pgdn' ) {
265 # last line on screen?
266 if ( $pos - $top_screen_line == $lines_on_screen ) {
267 $top_screen_line += $lines_on_screen;
268
269 my $max_top_screen_line =
270 $nr_lines > $lines_on_screen ? $nr_lines - $lines_on_screen : 0;
271
272 $top_screen_line = $max_top_screen_line if $top_screen_line > $max_top_screen_line;
273 warn "max_top_screen_line = $max_top_screen_line top_screen_line = $top_screen_line\n";
274 $self->redraw_screen;
275 }
276 $self->selected( $top_screen_line + $lines_on_screen - $pos );
277 }
278
279 if ( length($key) > 1 ) {
280 $self->status_text("key: $key");
281 } else {
282 $self->status_text( sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) ) );
283 }
284
285 # CTRL+L
286 $self->redraw_screen if ord($key) eq 0x0c;
287
288 # Enter
289 if ( ord($key) eq 0x0d && $sel_pos > 0 ) {
290 $self->error_text( "execute: " . $lines[ $sel_pos ] );
291 }
292
293 return if (lc($key) eq 'q');
294
295 $self->redraw_statusline;
296
297 }
298
299 $self->clrscr();
300 }
301
302 =head1 SEE ALSO
303
304 L<http://www.ossp.org/pkg/tool/iselect/> - Interactive Terminal Selection
305 written by Ralf S. Engelschall which is original implementation in C
306
307 =head1 AUTHOR
308
309 Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
310
311 =head1 COPYRIGHT & LICENSE
312
313 Copyright 2006-2007 Dobrica Pavlinusic, All Rights Reserved.
314
315 This program is free software; you can redistribute it and/or modify it
316 under the same terms as Perl itself.
317
318 =cut
319
320 1;

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