1 |
dpavlin |
1 |
#!/usr/bin/perl -w |
2 |
|
|
|
3 |
|
|
use strict; |
4 |
|
|
use Term::Screen; |
5 |
dpavlin |
7 |
use Carp qw/cluck/; |
6 |
dpavlin |
1 |
use Data::Dump qw/dump/; |
7 |
|
|
|
8 |
|
|
my $data = <<'EOF'; |
9 |
|
|
First line |
10 |
|
|
|
11 |
dpavlin |
4 |
{s}first selectable |
12 |
|
|
{s}second selectable |
13 |
dpavlin |
1 |
|
14 |
|
|
a space.... |
15 |
|
|
|
16 |
|
|
...infinity and beyond |
17 |
|
|
|
18 |
|
|
|
19 |
dpavlin |
4 |
{s}foo |
20 |
|
|
{s}bar |
21 |
dpavlin |
1 |
|
22 |
|
|
bum |
23 |
dpavlin |
4 |
|
24 |
dpavlin |
1 |
EOF |
25 |
|
|
|
26 |
|
|
open(my $ps, "ps ax |") || die "can't do ps ax: $!"; |
27 |
|
|
while(<$ps>) { |
28 |
dpavlin |
4 |
$data .= '{s}'.$_; |
29 |
|
|
$data .= $_; |
30 |
dpavlin |
1 |
} |
31 |
|
|
close($ps); |
32 |
|
|
|
33 |
dpavlin |
6 |
$data .= "\n--EOF--"; |
34 |
|
|
|
35 |
dpavlin |
2 |
my $scr; |
36 |
dpavlin |
1 |
|
37 |
dpavlin |
2 |
# leave sane terminal if script dies |
38 |
|
|
$SIG{__DIE__} = sub { |
39 |
|
|
eval { system('stty sane'); }; |
40 |
|
|
}; |
41 |
|
|
|
42 |
|
|
|
43 |
dpavlin |
1 |
my @lines = split(/\n/, $data); |
44 |
|
|
|
45 |
dpavlin |
6 |
my $top_screen_line = 0; # offset in original text |
46 |
dpavlin |
1 |
my $pos = 0; |
47 |
|
|
|
48 |
dpavlin |
2 |
# default: select first line |
49 |
|
|
my $sel_pos = 0; |
50 |
|
|
my $status_text = ''; |
51 |
|
|
my $error_text = ''; |
52 |
|
|
|
53 |
|
|
|
54 |
dpavlin |
1 |
# find which lines are selectable in input file |
55 |
|
|
my $selectable_line; |
56 |
|
|
|
57 |
|
|
for my $l (0 .. $#lines) { |
58 |
dpavlin |
4 |
if ($lines[$l] !~ s/^{s}//) { |
59 |
dpavlin |
1 |
$selectable_line->{$l}++; |
60 |
|
|
} |
61 |
|
|
} |
62 |
|
|
|
63 |
dpavlin |
2 |
# select first selectable line |
64 |
|
|
|
65 |
|
|
if ( $selectable_line ) { |
66 |
dpavlin |
3 |
$pos = $sel_pos = (sort { $a <=> $b } keys %$selectable_line)[0]; |
67 |
|
|
warn "selected first selectable line $sel_pos"; |
68 |
dpavlin |
2 |
} |
69 |
|
|
|
70 |
dpavlin |
1 |
sub full_line { |
71 |
|
|
my $t = shift; |
72 |
dpavlin |
4 |
$t = '' unless defined $t; |
73 |
dpavlin |
1 |
return $t . (" " x ($scr->cols - length($t))); |
74 |
|
|
} |
75 |
|
|
|
76 |
|
|
sub chunk { |
77 |
|
|
my $t = shift; |
78 |
dpavlin |
7 |
cluck "expected line" unless defined $t; |
79 |
|
|
return substr($t,0,$scr->cols); |
80 |
dpavlin |
1 |
} |
81 |
|
|
|
82 |
dpavlin |
4 |
sub redraw_line { |
83 |
|
|
my ($l,$line) = @_; |
84 |
|
|
|
85 |
|
|
if ( defined $selectable_line->{ $l } ) { |
86 |
|
|
$scr->at($l,0)->bold()->puts( full_line( chunk($line) ) )->normal(); |
87 |
|
|
} else { |
88 |
|
|
$scr->at($l,0)->puts( full_line( chunk($line) ) ); |
89 |
|
|
} |
90 |
|
|
} |
91 |
|
|
|
92 |
dpavlin |
1 |
sub redraw { |
93 |
dpavlin |
4 |
for my $l (0 .. $scr->rows - 3) { |
94 |
dpavlin |
6 |
my $line = $lines[ $l + $top_screen_line ]; |
95 |
dpavlin |
4 |
redraw_line( $l, $line ); |
96 |
dpavlin |
1 |
last if ($l == $#lines); |
97 |
|
|
} |
98 |
dpavlin |
7 |
selected(0); |
99 |
dpavlin |
1 |
} |
100 |
|
|
|
101 |
|
|
sub status { |
102 |
|
|
my $pcnt = int(($pos || 0) * 100 / ($#lines || 1)); |
103 |
|
|
my $pos_txt = sprintf('%d, %d%% ',$pos,$pcnt); |
104 |
|
|
|
105 |
|
|
$scr->at($scr->rows - 2,0)->reverse()->puts( |
106 |
|
|
sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$status_text) |
107 |
|
|
.$pos_txt)->normal(); |
108 |
|
|
$scr->at($scr->rows - 1,0)->puts( |
109 |
|
|
sprintf('%-'.$scr->cols.'s', $error_text) |
110 |
|
|
); |
111 |
|
|
} |
112 |
|
|
|
113 |
|
|
sub selected { |
114 |
dpavlin |
2 |
my $d = shift || 0; |
115 |
dpavlin |
1 |
|
116 |
dpavlin |
6 |
my $screen_line = $pos - $top_screen_line; |
117 |
dpavlin |
1 |
|
118 |
dpavlin |
4 |
redraw_line( $screen_line, $lines[$pos] ); |
119 |
dpavlin |
1 |
|
120 |
dpavlin |
4 |
my $last_screen_line = $scr->rows - 3; |
121 |
|
|
|
122 |
|
|
if ( $d < 0 && $screen_line == 0 ) { |
123 |
|
|
if ( $pos > 0 ) { |
124 |
dpavlin |
6 |
$top_screen_line--; |
125 |
dpavlin |
5 |
$pos--; |
126 |
dpavlin |
4 |
} else { |
127 |
|
|
$error_text = "Already at Begin."; |
128 |
|
|
} |
129 |
dpavlin |
1 |
redraw; |
130 |
dpavlin |
4 |
} elsif ( $d > 0 && $screen_line == $last_screen_line ) { |
131 |
dpavlin |
7 |
if ( $pos < $#lines ) { |
132 |
dpavlin |
6 |
$top_screen_line++; |
133 |
dpavlin |
5 |
$pos++; |
134 |
dpavlin |
4 |
} else { |
135 |
|
|
$error_text = "Already at End."; |
136 |
|
|
} |
137 |
dpavlin |
1 |
redraw; |
138 |
dpavlin |
4 |
} else { |
139 |
|
|
$pos += $d; |
140 |
dpavlin |
1 |
} |
141 |
|
|
|
142 |
dpavlin |
4 |
my $line = $lines[$pos]; |
143 |
|
|
if ( defined $selectable_line->{ $pos } ) { |
144 |
dpavlin |
6 |
$scr->at($pos - $top_screen_line,0)->reverse->bold()->puts( full_line( chunk($line) ) )->normal(); |
145 |
dpavlin |
4 |
$sel_pos = $pos; |
146 |
|
|
} else { |
147 |
dpavlin |
6 |
$scr->at($pos - $top_screen_line,0)->reverse->puts( full_line( chunk($line) ) ); |
148 |
dpavlin |
4 |
$sel_pos = -1; |
149 |
|
|
} |
150 |
dpavlin |
1 |
status; |
151 |
|
|
} |
152 |
|
|
|
153 |
dpavlin |
2 |
$scr = new Term::Screen || die "can't init Term::Screen"; |
154 |
|
|
$scr->clrscr()->noecho(); |
155 |
dpavlin |
1 |
redraw; |
156 |
|
|
selected; |
157 |
|
|
|
158 |
|
|
while(my $key = $scr->getch()) { |
159 |
|
|
|
160 |
|
|
$error_text = ""; |
161 |
|
|
|
162 |
dpavlin |
6 |
my $lines_on_screen = $scr->rows - 3; |
163 |
|
|
|
164 |
dpavlin |
1 |
if ($key eq 'ku') { |
165 |
|
|
selected( -1 ); |
166 |
|
|
} elsif ($key eq 'kd') { |
167 |
|
|
selected( +1 ); |
168 |
dpavlin |
6 |
} elsif ($key eq 'pgup' ) { |
169 |
|
|
# first line on screen? |
170 |
|
|
if ( $pos == $top_screen_line ) { |
171 |
|
|
$top_screen_line -= $lines_on_screen; |
172 |
dpavlin |
7 |
$top_screen_line = 0 if $top_screen_line < 0; |
173 |
dpavlin |
6 |
redraw; |
174 |
|
|
} |
175 |
dpavlin |
7 |
selected( -( $pos - $top_screen_line ) ); |
176 |
dpavlin |
6 |
} elsif ($key eq 'pgdn' ) { |
177 |
|
|
# last line on screen? |
178 |
|
|
if ( $pos - $top_screen_line == $lines_on_screen ) { |
179 |
|
|
$top_screen_line += $lines_on_screen; |
180 |
dpavlin |
7 |
$top_screen_line = $#lines - $lines_on_screen if $top_screen_line >= $#lines - $lines_on_screen; |
181 |
dpavlin |
6 |
redraw; |
182 |
|
|
} |
183 |
dpavlin |
7 |
selected( $top_screen_line + $lines_on_screen - $pos ); |
184 |
dpavlin |
1 |
} |
185 |
|
|
|
186 |
dpavlin |
6 |
$status_text = sprintf("pos: %-3d sel_pos: %-3d top_screen_line: %-3d", $pos, $sel_pos, $top_screen_line ); |
187 |
dpavlin |
4 |
if ( length($key) > 1 ) { |
188 |
|
|
$status_text .= " key: $key"; |
189 |
|
|
} else { |
190 |
|
|
$status_text .= sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) ); |
191 |
|
|
} |
192 |
|
|
|
193 |
dpavlin |
1 |
status; |
194 |
|
|
|
195 |
dpavlin |
7 |
# CTRL+L |
196 |
|
|
redraw if ord($key) eq 0x0c; |
197 |
dpavlin |
4 |
|
198 |
dpavlin |
1 |
exit if (lc($key) eq 'q'); |
199 |
|
|
} |
200 |
|
|
|
201 |
|
|
$scr->clrscr(); |