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#!/usr/bin/perl -w |
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|
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use strict; |
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use Term::Screen; |
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use Carp qw/cluck/; |
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use Data::Dump qw/dump/; |
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|
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my $data = <<'EOF'; |
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First line |
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|
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{s}first selectable |
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{s}second selectable |
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|
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a space.... |
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|
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...infinity and beyond |
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|
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|
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{s}foo |
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{s}bar |
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|
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bum |
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|
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EOF |
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|
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open(my $ps, "ps ax |") || die "can't do ps ax: $!"; |
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while(<$ps>) { |
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$data .= '{s}'.$_; |
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$data .= $_; |
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} |
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close($ps); |
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|
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$data .= "\n--EOF--"; |
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|
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my $scr; |
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|
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# leave sane terminal if script dies |
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$SIG{__DIE__} = sub { |
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eval { system('stty sane'); }; |
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}; |
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|
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|
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my @lines = split(/\n/, $data); |
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|
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my $top_screen_line = 0; # offset in original text |
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my $pos = 0; |
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|
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# default: select first line |
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my $sel_pos = 0; |
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my $status_text = ''; |
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my $error_text = ''; |
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|
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|
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# find which lines are selectable in input file |
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my $selectable_line; |
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|
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for my $l (0 .. $#lines) { |
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if ($lines[$l] !~ s/^{s}//) { |
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$selectable_line->{$l}++; |
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} |
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} |
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|
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# select first selectable line |
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|
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if ( $selectable_line ) { |
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$pos = $sel_pos = (sort { $a <=> $b } keys %$selectable_line)[0]; |
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warn "selected first selectable line $sel_pos"; |
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} |
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|
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sub full_line { |
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my $t = shift; |
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$t = '' unless defined $t; |
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return $t . (" " x ($scr->cols - length($t))); |
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} |
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|
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sub chunk { |
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my $t = shift; |
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cluck "expected line" unless defined $t; |
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return substr($t,0,$scr->cols); |
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} |
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|
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sub redraw_line { |
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my ($l,$line) = @_; |
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|
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if ( defined $selectable_line->{ $l } ) { |
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$scr->at($l,0)->bold()->puts( full_line( chunk($line) ) )->normal(); |
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} else { |
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$scr->at($l,0)->puts( full_line( chunk($line) ) ); |
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} |
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} |
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|
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sub redraw { |
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for my $l (0 .. $scr->rows - 3) { |
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my $line = $lines[ $l + $top_screen_line ]; |
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redraw_line( $l, $line ); |
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last if ($l == $#lines); |
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} |
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selected(0); |
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} |
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|
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sub status { |
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my $pcnt = int(($pos || 0) * 100 / ($#lines || 1)); |
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my $pos_txt = sprintf('%d, %d%% ',$pos,$pcnt); |
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|
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$scr->at($scr->rows - 2,0)->reverse()->puts( |
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sprintf(' %-'.($scr->cols - length($pos_txt) - 2).'s ',$status_text) |
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.$pos_txt)->normal(); |
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$scr->at($scr->rows - 1,0)->puts( |
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sprintf('%-'.$scr->cols.'s', $error_text) |
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); |
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} |
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|
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sub selected { |
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my $d = shift || 0; |
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|
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my $screen_line = $pos - $top_screen_line; |
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|
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redraw_line( $screen_line, $lines[$pos] ); |
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|
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my $last_screen_line = $scr->rows - 3; |
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|
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if ( $d < 0 && $screen_line == 0 ) { |
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if ( $pos > 0 ) { |
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$top_screen_line--; |
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$pos--; |
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} else { |
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$error_text = "Already at Begin."; |
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} |
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redraw; |
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} elsif ( $d > 0 && $screen_line == $last_screen_line ) { |
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if ( $pos < $#lines ) { |
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$top_screen_line++; |
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$pos++; |
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} else { |
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$error_text = "Already at End."; |
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} |
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redraw; |
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} else { |
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$pos += $d; |
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} |
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|
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my $line = $lines[$pos]; |
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if ( defined $selectable_line->{ $pos } ) { |
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$scr->at($pos - $top_screen_line,0)->reverse->bold()->puts( full_line( chunk($line) ) )->normal(); |
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$sel_pos = $pos; |
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} else { |
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$scr->at($pos - $top_screen_line,0)->reverse->puts( full_line( chunk($line) ) ); |
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$sel_pos = -1; |
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} |
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status; |
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} |
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|
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$scr = new Term::Screen || die "can't init Term::Screen"; |
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$scr->clrscr()->noecho(); |
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redraw; |
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selected; |
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|
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while(my $key = $scr->getch()) { |
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|
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$error_text = ""; |
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|
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my $lines_on_screen = $scr->rows - 3; |
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|
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if ($key eq 'ku') { |
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selected( -1 ); |
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} elsif ($key eq 'kd') { |
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selected( +1 ); |
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} elsif ($key eq 'pgup' ) { |
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# first line on screen? |
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if ( $pos == $top_screen_line ) { |
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$top_screen_line -= $lines_on_screen; |
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$top_screen_line = 0 if $top_screen_line < 0; |
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redraw; |
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} |
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selected( -( $pos - $top_screen_line ) ); |
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} elsif ($key eq 'pgdn' ) { |
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# last line on screen? |
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if ( $pos - $top_screen_line == $lines_on_screen ) { |
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$top_screen_line += $lines_on_screen; |
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$top_screen_line = $#lines - $lines_on_screen if $top_screen_line >= $#lines - $lines_on_screen; |
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redraw; |
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} |
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selected( $top_screen_line + $lines_on_screen - $pos ); |
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} |
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|
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$status_text = sprintf("pos: %-3d sel_pos: %-3d top_screen_line: %-3d", $pos, $sel_pos, $top_screen_line ); |
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if ( length($key) > 1 ) { |
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$status_text .= " key: $key"; |
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} else { |
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$status_text .= sprintf("key: %s [%03d][%02x]", $key =~ m/\w/ ? $key : '?' , ord($key), ord($key) ); |
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} |
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|
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status; |
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|
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# CTRL+L |
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redraw if ord($key) eq 0x0c; |
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|
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exit if (lc($key) eq 'q'); |
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} |
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|
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$scr->clrscr(); |
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