House keeping: removed unused brightness bash
This commit is contained in:
Sébastien Atoch
parent
05f9acdc5d
commit
b05abca3c1
2 changed files with 2 additions and 225 deletions
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#!/bin/bash
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#
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# Bash script to get/set monitor brightness.
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# This script acts as a smart wrapper for 'ddcutil' and the Linux sysfs backlight interface.
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#
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# It automatically determines whether to use ddcutil (for external monitors)
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# or the /sys/class/backlight interface (for internal displays like eDP/LVDS).
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#
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# --- Configuration ---
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readonly CACHE_PATH="/tmp/ddcutil_detect_cache.txt"
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readonly CACHE_TTL=3600 # Cache duration in seconds (1 hour)
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# --- Helper Functions ---
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# Prints an error message to stderr and exits with code 1.
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# Usage: fail "Error message"
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fail() {
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echo "Error: $1" >&2
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exit 1
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}
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# Checks if a monitor name corresponds to an internal display.
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# Usage: is_internal "monitor_name"
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# Returns 0 (true) if internal, 1 (false) otherwise.
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is_internal() {
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local monitor_name="$1"
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# eDP (embedded DisplayPort) and LVDS are common for laptop panels.
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if [[ "$monitor_name" == "eDP"* || "$monitor_name" == "LVDS"* ]]; then
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return 0 # Success (is internal)
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else
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return 1 # Failure (is not internal)
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fi
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}
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# Finds the corresponding backlight device in /sys/class/backlight for a given
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# connector name (e.g., "DP-1").
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# It echoes the device name (e.g., "intel_backlight") on success.
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# Usage: get_sysfs_backlight_device "connector_name"
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get_sysfs_backlight_device() {
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local target_connector="$1"
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for entry in /sys/class/backlight/*; do
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# Ensure it's a valid directory entry
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[ -d "$entry" ] || continue
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local device_name
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device_name=$(basename "$entry")
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# Prioritize nvidia devices if found
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if [[ "$device_name" == "nvidia_"* ]]; then
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echo "$device_name"
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return 0
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fi
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# Follow the symlink to find the graphics card connector
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local real_path
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if [ -L "$entry/device" ]; then
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real_path=$(readlink -f "$entry/device")
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# Extract the connector name from a path like .../card0-DP-1/...
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# This regex finds "card" + digits + "-", and captures what follows.
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if [[ "$real_path" =~ card[0-9]+-([^/]+) ]]; then
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local path_connector="${BASH_REMATCH[1]}"
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if [[ "$path_connector" == "$target_connector" ]]; then
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echo "$device_name"
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return 0
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fi
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fi
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fi
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done
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return 1 # Not found
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}
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# Retrieves the output of `ddcutil detect`, using a cache to avoid
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# repeated slow calls. Echoes the command output.
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# Usage: get_ddcutil_detect_output
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get_ddcutil_detect_output() {
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local use_cache=true
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if [ ! -f "$CACHE_PATH" ]; then
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use_cache=false
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else
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local now
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now=$(date +%s)
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local mtime
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mtime=$(stat -c %Y "$CACHE_PATH")
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local age=$((now - mtime))
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if (( age > CACHE_TTL )); then
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use_cache=false
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fi
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fi
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if [[ "$use_cache" == true ]]; then
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cat "$CACHE_PATH"
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else
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# Run the command, tee the output to the cache file, and also return it
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ddcutil detect 2>/dev/null | tee "$CACHE_PATH"
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fi
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}
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# Parses the output of `ddcutil detect` to find the display index (e.g., 1)
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# for a given monitor connector name (e.g., "DP-1").
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# Echoes the display index on success.
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# Usage: get_ddc_index_for_monitor "monitor_name"
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get_ddc_index_for_monitor() {
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local target_monitor="$1"
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local detect_output
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detect_output=$(get_ddcutil_detect_output)
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# Check if ddcutil command failed or produced no output
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if [ -z "$detect_output" ]; then
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return 1
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fi
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local current_display=""
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# Use process substitution and a while loop to read line-by-line
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# This avoids issues with subshells and variable scope.
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while IFS= read -r line; do
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# Find lines like "Display 1" and store the number
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if [[ "$line" =~ ^Display[[:space:]]+([0-9]+) ]]; then
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current_display="${BASH_REMATCH[1]}"
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continue
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fi
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# Once we have a display number, look for its connector info
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if [ -n "$current_display" ]; then
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# Look for lines like "DRM connector: card0-DP-1"
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if [[ "$line" =~ DRM_?connector:.*card[0-9]+-(${target_monitor}) ]]; then
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echo "$current_display"
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return 0
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fi
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fi
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done <<< "$detect_output"
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return 1 # Not found
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}
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# --- Main Logic ---
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main() {
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# Check for correct number of arguments
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if [[ "$#" -lt 2 ]]; then
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echo "-1"
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exit 1
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fi
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local cmd="$1"
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local mon="$2"
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local val="${3:-}" # Default to empty if not provided
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if is_internal "$mon"; then
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# --- Handle Internal Display (via /sys/class/backlight) ---
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local backlight_device
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backlight_device=$(get_sysfs_backlight_device "$mon")
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if [ -z "$backlight_device" ]; then
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echo "-1" # Error: Could not find backlight device
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exit 1
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fi
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local brightness_file="/sys/class/backlight/$backlight_device/brightness"
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local max_brightness_file="/sys/class/backlight/$backlight_device/max_brightness"
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if [ "$cmd" == "get" ]; then
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local current_b
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current_b=$(cat "$brightness_file")
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local max_b
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max_b=$(cat "$max_brightness_file")
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# Perform integer arithmetic to scale to 0-100
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echo $((current_b * 100 / max_b))
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elif [ "$cmd" == "set" ]; then
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[[ "$#" -lt 3 ]] && echo "-1" && exit 1
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local max_b
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max_b=$(cat "$max_brightness_file")
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# Scale the 0-100 value to the device's raw value
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local raw_brightness=$((val * max_b / 100))
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# NOTE: Writing here may require root privileges or specific udev rules.
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if ! echo "$raw_brightness" > "$brightness_file" 2>/dev/null; then
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echo "-1" # Error: Permission denied or other write error
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exit 1
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fi
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echo "$val" # Echo back the set value on success
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else
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echo "-1" # Invalid command
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exit 1
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fi
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else
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# --- Handle External Display (via ddcutil) ---
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local display_index
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display_index=$(get_ddc_index_for_monitor "$mon")
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if [ -z "$display_index" ]; then
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echo "-1" # Error: Could not find DDC display index
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exit 1
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fi
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if [ "$cmd" == "get" ]; then
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# Call ddcutil, parse for "current value = X,"
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local output
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output=$(ddcutil --display "$display_index" getvcp 10 2>/dev/null)
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if [[ "$output" =~ current[[:space:]]+value[[:space:]]*=[[:space:]]*([0-9]+) ]]; then
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echo "${BASH_REMATCH[1]}"
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else
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echo "-1" # Error: Could not parse brightness from ddcutil
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exit 1
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fi
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elif [ "$cmd" == "set" ]; then
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[[ "$#" -lt 3 ]] && echo "-1" && exit 1
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if ddcutil --display "$display_index" setvcp 10 "$val" >/dev/null 2>&1; then
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echo "$val" # Echo back the set value on success
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else
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echo "-1" # Error: ddcutil command failed
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exit 1
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fi
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else
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echo "-1" # Invalid command
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exit 1
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fi
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fi
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}
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# Run the main function with all script arguments
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main "$@"
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@ -97,11 +97,11 @@ Singleton {
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path: Settings.configDir + "colors.json"
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path: Settings.configDir + "colors.json"
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watchChanges: true
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watchChanges: true
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onFileChanged: {
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onFileChanged: {
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Logger.log("Colors", "Reloading colors from disk")
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Logger.log("Color", "Reloading colors from disk")
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reload()
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reload()
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}
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}
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onAdapterUpdated: {
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onAdapterUpdated: {
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Logger.log("Colors", "Writing colors to disk")
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Logger.log("Color", "Writing colors to disk")
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writeAdapter()
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writeAdapter()
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}
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}
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onLoadFailed: function (error) {
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onLoadFailed: function (error) {
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