desktop: add a script for toggling the brightness on individual outputs

Allows to software-disable a single output, useful e.g. when watching
movies.

2 files changed, 58 insertions, 0 deletions

diff --git a/bin/randr_output_toggle b/bin/randr_output_toggle
new file mode 100755
index 0000000..3906655
--- /dev/null
+++ b/bin/randr_output_toggle
@@ -0,0 +1,57 @@
+#!/usr/bin/python3
+# Toggle the brightness on the given randr output
+
+import subprocess
+import os
+import os.path
+import re
+import random
+import sys
+import tempfile
+
+class Display:
+    index           = None
+    name            = None
+    offset          = None
+    size            = None
+
+    wall_filename   = None
+
+    def __cmp__(self, other):
+        if self.offset[1] != other.offset[1]:
+            return cmp(self.offset[1], other.offset[1])
+        return cmp(self.offset[0], other.offset[0])
+
+def parse_outputs():
+    outputs = {}
+
+    p = subprocess.run(['xrandr', '--verbose'], check = True, capture_output = True,
+                       encoding = 'utf-8')
+    cur_output = None
+    for line in p.stdout.splitlines():
+        m = re.match(r'(\S*) connected.*', line)
+        if m:
+            cur_output = m.group(1)
+            continue
+
+        if 'Brightness:' in line:
+            _, val = line.strip().split()
+            outputs[cur_output] = float(val)
+            cur_output = None
+
+    return outputs
+
+if len(sys.argv) < 2:
+    sys.stderr.write('Usage: %s <output name>\n'%(sys.argv[0]))
+    sys.exit(1)
+
+output  = sys.argv[1]
+outputs = parse_outputs()
+
+if not output in outputs:
+    sys.stderr.write('No such output: %s\n' % output)
+    sys.exit(1)
+
+val = 0.0 if outputs[output] == 1.0 else 1.0
+subprocess.run(['xrandr', '--output', output, '--brightness', str(val)],
+               check = True)
diff --git a/desktop.conf.yaml b/desktop.conf.yaml
index 81ade61..292e8c6 100644
--- a/desktop.conf.yaml
+++ b/desktop.conf.yaml
@@ -5,6 +5,7 @@
 - link:
     ~/.config/mpv/config: dotfiles/mpv
     ~/.local/bin/brightness_monitor:  bin/brightness_monitor
+    ~/.local/bin/randr_output_toggle: bin/randr_output_toggle
     ~/.local/bin/ssh_sk_clean:  bin/ssh_sk_clean
     ~/.local/bin/udev_match:    bin/udev_match
     ~/.urxvt/ext/reselect: urxvt/reselect/reselect