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

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Revision 19 - (hide annotations)
Thu Oct 25 19:37:10 2007 UTC (11 years, 9 months ago) by dpavlin
File size: 6517 byte(s)
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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 dpavlin 19
84     $t =~ s/{s}//;
85    
86 dpavlin 12 $t = '' unless defined $t;
87 dpavlin 14 $t = substr($t,0,$cols) if length($t) > $cols;
88     return $t . (" " x ($cols - length($t)));
89 dpavlin 12 }
90    
91    
92 dpavlin 14 =head2 redraw_line
93    
94     $iselect->redraw_line( $line_on_screen, $content_of_line );
95    
96     =cut
97    
98 dpavlin 12 sub redraw_line {
99 dpavlin 14 my $self = shift;
100    
101 dpavlin 12 my ($l,$line) = @_;
102    
103     if ( defined $selectable_line->{ $l + $top_screen_line } ) {
104 dpavlin 14 $self->screen->at($l,0)->bold()->puts( $self->full_line( $line ) )->normal();
105 dpavlin 12 } else {
106 dpavlin 14 $self->screen->at($l,0)->puts( $self->full_line( $line ) )
107 dpavlin 12 }
108     }
109    
110 dpavlin 14 =head2 redraw_screen
111    
112     $iselect->redraw_screen
113    
114     =cut
115    
116     sub redraw_screen {
117     my $self = shift;
118 dpavlin 15 my @lines = @{ $self->lines };
119     $nr_lines = $#lines;
120 dpavlin 14 for my $l (0 .. $self->screen->rows - $status_lines) {
121 dpavlin 12 my $line = $lines[ $l + $top_screen_line ];
122 dpavlin 14 $self->redraw_line( $l, $line );
123 dpavlin 12 last if ($l == $#lines);
124     }
125 dpavlin 14 $self->selected;
126 dpavlin 12 }
127    
128 dpavlin 14 =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 dpavlin 15 my $pcnt = int(($pos || 0) * 100 / ( $nr_lines || 1 ) );
140     my $pos_txt = sprintf('%d/%s, %d%% ',$pos,$nr_lines,$pcnt);
141 dpavlin 14
142     my $scr = $self->screen || confess "need screen";
143    
144 dpavlin 15 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 dpavlin 12 $scr->at($scr->rows - $status_lines + 1,0)->reverse()->puts(
149 dpavlin 15 sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$status_text)
150     .$pos_txt)->normal();
151 dpavlin 14
152 dpavlin 12 $scr->at($scr->rows - $status_lines + 2,0)->puts(
153 dpavlin 14 sprintf('%-'.$scr->cols.'s', $self->error_text)
154     ) if $self->error_text;
155 dpavlin 12 }
156    
157 dpavlin 14 =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 dpavlin 12 sub selected {
168 dpavlin 14 my $self = shift;
169    
170 dpavlin 12 my $d = shift || 0;
171    
172     my $screen_line = $pos - $top_screen_line;
173    
174 dpavlin 15 $self->redraw_line( $screen_line, $self->lines->[$pos] );
175 dpavlin 12
176 dpavlin 14 my $last_screen_line = $self->screen->rows - $status_lines;
177 dpavlin 12
178     if ( $d < 0 && $screen_line == 0 ) {
179     if ( $pos > 0 ) {
180     $top_screen_line--;
181     $pos--;
182     } else {
183 dpavlin 14 $self->error_text( "Already at Begin." );
184 dpavlin 12 }
185 dpavlin 14 $self->redraw_screen;
186 dpavlin 12 } elsif ( $d > 0 && $screen_line == $last_screen_line ) {
187 dpavlin 15 if ( $pos < $nr_lines ) {
188 dpavlin 12 $top_screen_line++;
189     $pos++;
190     } else {
191 dpavlin 14 $self->error_text( "Already at End." );
192 dpavlin 12 }
193 dpavlin 14 $self->redraw_screen;
194 dpavlin 12 } else {
195     $pos += $d;
196     }
197    
198 dpavlin 15 my $line = $self->lines->[$pos];
199 dpavlin 12 if ( defined $selectable_line->{ $pos } ) {
200 dpavlin 14 $self->screen->at($pos - $top_screen_line,0)->reverse->bold()->puts( $self->full_line( $line ) )->normal();
201 dpavlin 12 $sel_pos = $pos;
202     } else {
203 dpavlin 14 $self->screen->at($pos - $top_screen_line,0)->reverse->puts( $self->full_line( $line ) );
204 dpavlin 12 $sel_pos = -1;
205     }
206 dpavlin 14 $self->redraw_statusline;
207 dpavlin 12 }
208    
209    
210 dpavlin 14 =head2 loop
211 dpavlin 12
212 dpavlin 14 $iselect->loop(
213 dpavlin 12 sub {
214     my $line = shift;
215     warn "got line: $line\n";
216 dpavlin 14 }
217 dpavlin 12 );
218    
219     =cut
220    
221 dpavlin 14 sub loop {
222     my $self = shift;
223 dpavlin 12
224     my $callback = shift;
225     confess "expect callback as first arg" unless ref($callback) eq 'CODE';
226    
227 dpavlin 17 my @lines = @{ $self->lines };
228 dpavlin 12
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 dpavlin 14 $self->open_screen unless $self->screen;
243 dpavlin 12
244 dpavlin 14 $self->screen->clrscr()->noecho();
245     $self->redraw_screen;
246     $self->selected;
247 dpavlin 12
248 dpavlin 14 while(my $key = $self->screen->getch()) {
249 dpavlin 12
250 dpavlin 14 my $lines_on_screen = $self->screen->rows - $status_lines;
251 dpavlin 12
252     if ($key eq 'ku') {
253 dpavlin 14 $self->selected( -1 );
254 dpavlin 12 } elsif ($key eq 'kd') {
255 dpavlin 14 $self->selected( +1 );
256 dpavlin 12 } elsif ($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 dpavlin 14 $self->redraw_screen;
262 dpavlin 12 }
263 dpavlin 14 $self->selected( -( $pos - $top_screen_line ) );
264 dpavlin 12 } elsif ($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 dpavlin 16
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 dpavlin 14 $self->redraw_screen;
275 dpavlin 12 }
276 dpavlin 14 $self->selected( $top_screen_line + $lines_on_screen - $pos );
277 dpavlin 12 }
278    
279     if ( length($key) > 1 ) {
280 dpavlin 15 $self->status_text("key: $key");
281 dpavlin 12 } else {
282 dpavlin 15 $self->status_text( sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) ) );
283 dpavlin 12 }
284    
285     # CTRL+L
286 dpavlin 14 $self->redraw_screen if ord($key) eq 0x0c;
287 dpavlin 12
288     # Enter
289     if ( ord($key) eq 0x0d && $sel_pos > 0 ) {
290 dpavlin 14 $self->error_text( "execute: " . $lines[ $sel_pos ] );
291 dpavlin 12 }
292    
293 dpavlin 14 return if (lc($key) eq 'q');
294 dpavlin 12
295 dpavlin 14 $self->redraw_statusline;
296 dpavlin 12
297     }
298    
299 dpavlin 14 $self->clrscr();
300 dpavlin 12 }
301    
302 dpavlin 13 =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 dpavlin 12 1;

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