From 308af38a38f44a0e9bf357489e5f787cc6c900e9 Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Sat, 3 Apr 2021 11:33:49 +0900
Subject: [PATCH] include/xrandr: Add functions for querying the monitor state
 from xrandr

This adds convenience functions for getting the current resolution and
available resolutions for a monitor.
---
 include/xrandr.sh | 87 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 include/xrandr.sh

diff --git a/include/xrandr.sh b/include/xrandr.sh
new file mode 100644
index 0000000..40c645c
--- /dev/null
+++ b/include/xrandr.sh
@@ -0,0 +1,87 @@
+#/bin/bash
+
+__init() {
+	return 0
+}
+
+xrandr_get_monitors() {
+	local conns
+
+	if ! conns=$(xrandr | grep -F " connected "); then
+		return 1
+	fi
+
+	cut -d ' ' -f 1 <<< "$conns"
+	return 0
+}
+
+_xrandr_list_all() {
+	local screen
+	local monitor
+	local line
+
+	local re_screen
+	local re_monitor
+	local re_current
+
+	re_screen='Screen ([0-9]+):'
+	re_monitor='([^ ]+) (dis)*connected'
+	re_current='[0-9]+\.[0-9]+\*'
+
+	while read -r line; do
+		local resolution
+		local freqs
+
+		if [[ "$line" =~ $re_screen ]]; then
+			screen="${BASH_REMATCH[1]}"
+			continue
+		fi
+
+		if [[ "$line" =~ $re_monitor ]]; then
+			monitor="${BASH_REMATCH[1]}"
+			continue
+		fi
+
+		if read -r resolution other <<< "$line"; then
+			local current
+
+			if [[ "$other" =~ $re_current ]]; then
+				current="current"
+			else
+				current=""
+			fi
+
+			echo "$screen $monitor $resolution $current"
+		fi
+	done < <(xrandr)
+
+	return 0
+}
+
+xrandr_monitor_get_resolution() {
+	local monitor="$1"
+
+	local resolution
+
+	if ! resolution=$(_xrandr_list_all | grep -F " $monitor " |
+				  grep -F " current"); then
+		return 1
+	fi
+
+	cut -d ' ' -f 3 <<< "$resolution"
+	return 0
+}
+
+xrandr_monitor_get_resolutions() {
+	local monitor="$1"
+	local current_only="$2"
+
+	local resolutions
+
+	if ! resolutions=$(_xrandr_list_all | grep -F " $monitor "); then
+		return 1
+	fi
+
+	cut -d ' ' -f 3 <<< "$resolutions"
+	return 0
+}
-- 
2.47.3