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

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Revision 17 - (hide annotations)
Thu Oct 25 19:32:15 2007 UTC (11 years, 7 months ago) by dpavlin
File size: 6499 byte(s)
fix selectable line lookup
1 dpavlin 12 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 dpavlin 13 use base qw/Class::Accessor/;
11     __PACKAGE__->mk_accessors( qw/
12 dpavlin 14 screen
13 dpavlin 13 lines
14 dpavlin 14 error_text
15     status_text
16 dpavlin 12
17 dpavlin 13 debug
18     / );
19    
20    
21     our $VERSION = '0.01';
22    
23 dpavlin 12 =head1 NAME
24    
25     Term::ISelect - perl only implementation of Interactive Terminal Selection
26    
27     =head1 METHODS
28    
29 dpavlin 13 =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 dpavlin 14 =head2 open_screen
42    
43     $iselect->open_screen;
44    
45 dpavlin 12 =cut
46    
47     # leave sane terminal if script dies
48     $SIG{__DIE__} = sub {
49     eval { system('stty sane'); };
50     };
51    
52 dpavlin 14 sub open_screen {
53     my $self = shift;
54     $self->screen( new Term::Screen );
55     }
56 dpavlin 12
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 dpavlin 15 my $nr_lines = 0;
68    
69 dpavlin 14 =head2 full_line
70    
71     Returns line padded up to screen width
72    
73     $iselect->full_line( "foo bar" );
74    
75     =cut
76    
77 dpavlin 12 sub full_line {
78 dpavlin 14 my $self = shift;
79    
80     my $cols = $self->screen->cols;
81    
82 dpavlin 12 my $t = shift;
83     $t = '' unless defined $t;
84 dpavlin 14 $t = substr($t,0,$cols) if length($t) > $cols;
85     return $t . (" " x ($cols - length($t)));
86 dpavlin 12 }
87    
88    
89 dpavlin 14 =head2 redraw_line
90    
91     $iselect->redraw_line( $line_on_screen, $content_of_line );
92    
93     =cut
94    
95 dpavlin 12 sub redraw_line {
96 dpavlin 14 my $self = shift;
97    
98 dpavlin 12 my ($l,$line) = @_;
99    
100     if ( defined $selectable_line->{ $l + $top_screen_line } ) {
101 dpavlin 14 $self->screen->at($l,0)->bold()->puts( $self->full_line( $line ) )->normal();
102 dpavlin 12 } else {
103 dpavlin 14 $self->screen->at($l,0)->puts( $self->full_line( $line ) )
104 dpavlin 12 }
105     }
106    
107 dpavlin 14 =head2 redraw_screen
108    
109     $iselect->redraw_screen
110    
111     =cut
112    
113     sub redraw_screen {
114     my $self = shift;
115 dpavlin 15 my @lines = @{ $self->lines };
116     $nr_lines = $#lines;
117 dpavlin 14 for my $l (0 .. $self->screen->rows - $status_lines) {
118 dpavlin 12 my $line = $lines[ $l + $top_screen_line ];
119 dpavlin 14 $self->redraw_line( $l, $line );
120 dpavlin 12 last if ($l == $#lines);
121     }
122 dpavlin 14 $self->selected;
123 dpavlin 12 }
124    
125 dpavlin 14 =head2 redraw_statusline
126    
127     Redraw status line
128    
129     $iselect->redraw_statusline;
130    
131     =cut
132    
133     sub redraw_statusline {
134     my $self = shift;
135    
136 dpavlin 15 my $pcnt = int(($pos || 0) * 100 / ( $nr_lines || 1 ) );
137     my $pos_txt = sprintf('%d/%s, %d%% ',$pos,$nr_lines,$pcnt);
138 dpavlin 14
139     my $scr = $self->screen || confess "need screen";
140    
141 dpavlin 15 my $status_text = sprintf("pos: %-3d sel_pos: %-3d top_screen_line: %-3d", $pos, $sel_pos, $top_screen_line );
142    
143     $status_text .= ' ' . $self->status_text if $self->status_text;
144    
145 dpavlin 12 $scr->at($scr->rows - $status_lines + 1,0)->reverse()->puts(
146 dpavlin 15 sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$status_text)
147     .$pos_txt)->normal();
148 dpavlin 14
149 dpavlin 12 $scr->at($scr->rows - $status_lines + 2,0)->puts(
150 dpavlin 14 sprintf('%-'.$scr->cols.'s', $self->error_text)
151     ) if $self->error_text;
152 dpavlin 12 }
153    
154 dpavlin 14 =head2 selected
155    
156     Move selection (or refresh it)
157    
158     $iselect->selected( +1 );
159     $iselect->selected( -1 );
160     $iselect->selected( 0 );
161    
162     =cut
163    
164 dpavlin 12 sub selected {
165 dpavlin 14 my $self = shift;
166    
167 dpavlin 12 my $d = shift || 0;
168    
169     my $screen_line = $pos - $top_screen_line;
170    
171 dpavlin 15 $self->redraw_line( $screen_line, $self->lines->[$pos] );
172 dpavlin 12
173 dpavlin 14 my $last_screen_line = $self->screen->rows - $status_lines;
174 dpavlin 12
175     if ( $d < 0 && $screen_line == 0 ) {
176     if ( $pos > 0 ) {
177     $top_screen_line--;
178     $pos--;
179     } else {
180 dpavlin 14 $self->error_text( "Already at Begin." );
181 dpavlin 12 }
182 dpavlin 14 $self->redraw_screen;
183 dpavlin 12 } elsif ( $d > 0 && $screen_line == $last_screen_line ) {
184 dpavlin 15 if ( $pos < $nr_lines ) {
185 dpavlin 12 $top_screen_line++;
186     $pos++;
187     } else {
188 dpavlin 14 $self->error_text( "Already at End." );
189 dpavlin 12 }
190 dpavlin 14 $self->redraw_screen;
191 dpavlin 12 } else {
192     $pos += $d;
193     }
194    
195 dpavlin 15 my $line = $self->lines->[$pos];
196 dpavlin 12 if ( defined $selectable_line->{ $pos } ) {
197 dpavlin 14 $self->screen->at($pos - $top_screen_line,0)->reverse->bold()->puts( $self->full_line( $line ) )->normal();
198 dpavlin 12 $sel_pos = $pos;
199     } else {
200 dpavlin 14 $self->screen->at($pos - $top_screen_line,0)->reverse->puts( $self->full_line( $line ) );
201 dpavlin 12 $sel_pos = -1;
202     }
203 dpavlin 14 $self->redraw_statusline;
204 dpavlin 12 }
205    
206    
207 dpavlin 14 =head2 loop
208 dpavlin 12
209 dpavlin 14 $iselect->loop(
210 dpavlin 12 sub {
211     my $line = shift;
212     warn "got line: $line\n";
213 dpavlin 14 }
214 dpavlin 12 );
215    
216     =cut
217    
218 dpavlin 14 sub loop {
219     my $self = shift;
220 dpavlin 12
221     my $callback = shift;
222     confess "expect callback as first arg" unless ref($callback) eq 'CODE';
223    
224 dpavlin 17 my @lines = @{ $self->lines };
225 dpavlin 12
226     # find which lines are selectable in input file
227     for my $l (0 .. $#lines) {
228     if ($lines[$l] =~ s/^{s}//) {
229     $selectable_line->{$l}++;
230     }
231     }
232    
233     # select first selectable line
234     if ( $selectable_line ) {
235     $pos = $sel_pos = (sort { $a <=> $b } keys %$selectable_line)[0];
236     warn "selected first selectable line $sel_pos";
237     }
238    
239 dpavlin 14 $self->open_screen unless $self->screen;
240 dpavlin 12
241 dpavlin 14 $self->screen->clrscr()->noecho();
242     $self->redraw_screen;
243     $self->selected;
244 dpavlin 12
245 dpavlin 14 while(my $key = $self->screen->getch()) {
246 dpavlin 12
247 dpavlin 14 my $lines_on_screen = $self->screen->rows - $status_lines;
248 dpavlin 12
249     if ($key eq 'ku') {
250 dpavlin 14 $self->selected( -1 );
251 dpavlin 12 } elsif ($key eq 'kd') {
252 dpavlin 14 $self->selected( +1 );
253 dpavlin 12 } elsif ($key eq 'pgup' ) {
254     # first line on screen?
255     if ( $pos == $top_screen_line ) {
256     $top_screen_line -= $lines_on_screen;
257     $top_screen_line = 0 if $top_screen_line < 0;
258 dpavlin 14 $self->redraw_screen;
259 dpavlin 12 }
260 dpavlin 14 $self->selected( -( $pos - $top_screen_line ) );
261 dpavlin 12 } elsif ($key eq 'pgdn' ) {
262     # last line on screen?
263     if ( $pos - $top_screen_line == $lines_on_screen ) {
264     $top_screen_line += $lines_on_screen;
265 dpavlin 16
266     my $max_top_screen_line =
267     $nr_lines > $lines_on_screen ? $nr_lines - $lines_on_screen : 0;
268    
269     $top_screen_line = $max_top_screen_line if $top_screen_line > $max_top_screen_line;
270     warn "max_top_screen_line = $max_top_screen_line top_screen_line = $top_screen_line\n";
271 dpavlin 14 $self->redraw_screen;
272 dpavlin 12 }
273 dpavlin 14 $self->selected( $top_screen_line + $lines_on_screen - $pos );
274 dpavlin 12 }
275    
276     if ( length($key) > 1 ) {
277 dpavlin 15 $self->status_text("key: $key");
278 dpavlin 12 } else {
279 dpavlin 15 $self->status_text( sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) ) );
280 dpavlin 12 }
281    
282     # CTRL+L
283 dpavlin 14 $self->redraw_screen if ord($key) eq 0x0c;
284 dpavlin 12
285     # Enter
286     if ( ord($key) eq 0x0d && $sel_pos > 0 ) {
287 dpavlin 14 $self->error_text( "execute: " . $lines[ $sel_pos ] );
288 dpavlin 12 }
289    
290 dpavlin 14 return if (lc($key) eq 'q');
291 dpavlin 12
292 dpavlin 14 $self->redraw_statusline;
293 dpavlin 12
294     }
295    
296 dpavlin 14 $self->clrscr();
297 dpavlin 12 }
298    
299 dpavlin 13 =head1 SEE ALSO
300    
301     L<http://www.ossp.org/pkg/tool/iselect/> - Interactive Terminal Selection
302     written by Ralf S. Engelschall which is original implementation in C
303    
304     =head1 AUTHOR
305    
306     Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
307    
308     =head1 COPYRIGHT & LICENSE
309    
310     Copyright 2006-2007 Dobrica Pavlinusic, All Rights Reserved.
311    
312     This program is free software; you can redistribute it and/or modify it
313     under the same terms as Perl itself.
314    
315     =cut
316    
317 dpavlin 12 1;

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