306 righe
8.1 KiB
Perl
Executable File
306 righe
8.1 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# Files containing current and max brightness values
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my $cur_file = "/sys/class/backlight/intel_backlight/brightness";
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my $max_file = "/sys/class/backlight/intel_backlight/max_brightness";
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my $last_file = "/home/jpm/.config/blc.last";
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sub to_percent {
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my $value = shift;
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if ($value eq "Permission Denied") {
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return $value;
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} else {
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$value = int($value/get_max()*100);
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return $value . '%';
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}
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}
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sub get_offset {
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return int(get_max()/100);
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}
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sub get_current {
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open(my $c,'<',"$cur_file");
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my $current = <$c>;
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close $c;
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chomp $current;
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return $current;
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}
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sub get_max {
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open(my $m,'<',"$max_file");
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my $max = <$m>;
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close $m;
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chomp $max;
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return $max;
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}
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sub get_min {
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return int((get_max()/100)+2);
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}
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sub writable {
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if (! -w $cur_file) {
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return 0;
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} else {
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return 1;
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}
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}
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sub increment {
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if (writable()) {
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my $current = get_current();
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my $max = get_max();
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my $target = $current+get_offset();
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if ($target > $max) {
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$target = $max;
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}
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open(my $c,'>',"$cur_file");
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print $c $target;
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close $c;
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return $target;
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} else {
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return "Permission Denied";
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}
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}
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sub decrement {
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if (writable()) {
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my $current = get_current();
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my $min = get_min();
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my $target = $current-get_offset();
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if ($target < $min) {
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$target = $min;
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}
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open(my $c,'>',"$cur_file");
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print $c $target;
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close $c;
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return $target;
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} else {
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return "Permission Denied";
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}
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}
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sub set {
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my $value = shift;
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if (writable()) {
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$current = get_current();
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if ($value > $current) {
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for (my $i=$current;$i<=$value;$i++) {
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open(my $c,'>',"$cur_file");
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print $c $i;
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close $c;
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}
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} else {
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for (my $i=$current;$i>=$value;$i--) {
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open(my $c,'>',"$cur_file");
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print $c $i;
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close $c;
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}
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}
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return $value;
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} else {
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return "Permission Denied";
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}
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}
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sub help {
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print "
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Backlight Control
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Usage: blc.pl [--silent|--notify] [OPTION] [VALUE]
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With no option the backlight information is printed as JSON.
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Output printed to STDOUT unless:
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--silent Do not display output (overrides --notify)
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--notify Send output to notification daemon. --notify=N will
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change the display duration in ms. Default is 200ms
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Output option must preceed the first Action option.
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Actions:
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= VALUE Set backlight to specific value. VALUE greater than
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100 will be treated as absolute value. VALUE eqaul to
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or less than 100 will be treated as a percentage
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++ Increment by 1%
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+= VALUE Increment by VALUE percent
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-- Decrement by 1%
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-= VALUE Decrement by VALUE percent
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Actions corrected to 1% or 100% if over or under. All actions
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provide output as a percentage, with the % symbol.
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Final percentage printed as below, skipping other options.
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Print:
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== Print current absolute value
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^ Print maximum absolute value
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% Print current percentage (does not include % symbol)
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--help Help (not impacted by --silent or --notify)
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--HELP Advanced help (same as above)
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Any other option will be printed literally";
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}
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sub advanced {
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$current = get_current();
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$max = get_max();
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print ".
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Print functions can be strung together but command will exit
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with the first non-print option. eg.
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\$ blc.pl == / ^
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21/100
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\$ blc.pl == ++
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('==' ignored)
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(Backlight incremented)
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Escape options with \\ in quotes to display them literally. eg.
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\$ blc.pl == / ^ '\\=' % \'\\%\'
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" . $current . "/" . $max . "=" . int($current/$max*100) . "%
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Only one \'\\' is removed per block. eg.
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\$ blc.pl '\\% \\'
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% \\
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";
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}
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my $current = get_current();
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my (@output, $target, $silent, $notify);
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if (scalar @ARGV) {
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for (my $i=0;$i<scalar @ARGV;$i++) {
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if ($ARGV[$i] eq '++') {
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$target = increment();
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@output = to_percent($target);
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last;
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} elsif ($ARGV[$i] eq '+=') {
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for (my $i=0;$i<scalar @ARGV;$i++) {
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if ($ARGV[$i] eq '+=') {
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if (defined $ARGV[($i+1)]) {
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$count = $ARGV[($i+1)];
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for (my $j=0;$j<$count;$j++) {
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$target = increment();
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if ($target eq "Permission Denied") {
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last;
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}
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}
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@output = to_percent($target);
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} else {
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@output = ("No value after $ARGV[$i]");
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}
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last;
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}
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}
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last;
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} elsif ($ARGV[$i] eq '--') {
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$target = decrement();
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@output = to_percent($target);
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last;
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} elsif ($ARGV[$i] eq '-=') {
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for (my $i=0;$i<scalar @ARGV;$i++) {
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if ($ARGV[$i] eq '-=') {
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if (defined $ARGV[($i+1)]) {
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$count = $ARGV[($i+1)];
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for (my $j=0;$j<$count;$j++) {
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$target = decrement();
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if ($target eq "Permission Denied") {
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last;
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}
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}
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@output = to_percent($target);
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} else {
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@output = ("No value after $ARGV[$i]");
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}
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last;
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}
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}
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last;
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} elsif ($ARGV[$i] eq '=') {
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$target = $ARGV[($i+1)];
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if (defined $target) {
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if ($target < 1) {
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$target = set(get_min());
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} elsif ($target > get_max()) {
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$target = set(get_max());
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} elsif ($target > 100) {
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$target = set($target);
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} else {
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$target = set(int((get_max()*$target/100)+1));
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}
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if ($target eq "Permission Denied") {
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@output = $target;
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} else {
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@output = to_percent($target);
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}
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last;
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} else {
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@output = ("No value after $ARGV[$i]");
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last;
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}
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} elsif ($ARGV[$i] eq '%') {
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push @output,int(get_current()/get_max()*100);
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} elsif ($ARGV[$i] eq '^') {
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push @output,get_max();
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} elsif ($ARGV[$i] eq '==') {
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push @output,get_current();
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} elsif ($ARGV[$i] eq '--help') {
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help();
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print " (see --HELP).\n\n";
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exit();
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} elsif ($ARGV[$i] eq '--HELP') {
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help();
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advanced();
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exit();
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} elsif ($ARGV[$i] eq '--silent') {
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$silent = 'TRUE';
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} elsif ($ARGV[$i] =~ /^--notify/) {
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$notify = 'TRUE';
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if ($ARGV[$i] =~ /=[0-9]+$/) {
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$duration = $ARGV[$i];
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$duration =~ s/.*=([0-9]+)/$1/;
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} else {
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$duration = 200;
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}
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} else {
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my $add = $ARGV[$i];
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$add =~ s/\\//;
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push @output,$add;
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}
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}
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} else {
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@output = ('{"Backlight":{"Max":"' . get_max() . '","Current":"' . get_current() . '","Percentage","' . int(get_current()/get_max()*100) . '%"}}');
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}
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open(my $fh,'>',$last_file);
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print $fh get_current();
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close($fh);
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if ($silent) {
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exit();
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} elsif ($notify) {
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# Don't output anything if the value didn't change
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if ($current == get_current()) {
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exit();
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}
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my $concat;
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foreach (@output) {
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$concat .= $_;
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}
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system "notify-send --urgency=normal -i /usr/share/icons/Papirus-Dark-Grey/48x48/status/notification-display-brightness.svg -t $duration \"$concat\"";
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exit();
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} else {
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print foreach @output;
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print "\n";
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exit();
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}
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