Add brightness control support with brightnessctl (#626)

* Added key binds to control brightness

I added keybinds to control brightness with brightnessctl. 

F5 to decrease brightness.
f6 to increase brightness.

* Update src/main.zig

Co-authored-by: ShiningLea <anerruption@disroot.org>

* added proper keybinds and configs for brightness control

* Update src/main.zig

Co-authored-by: ShiningLea <anerruption@disroot.org>

* code improvement and changes

* updated en.ini

---------

Co-authored-by: ShiningLea <anerruption@disroot.org>

res/config.ini

@@ -160,3 +160,8 @@ xauth_cmd = /usr/bin/xauth
 
 # Xorg desktop environments
 xsessions = /usr/share/xsessions
+
+# Brightness control
+brightness_down_key = F5
+brightness_up_key = F6
+Brightness_change = 10

res/lang/en.ini

@@ -2,6 +2,7 @@ authenticating = authenticating...
 capslock = capslock
 err_alloc = failed memory allocation
 err_bounds = out-of-bounds index
+err_brightness_change = failed to change brightness
 err_chdir = failed to open home folder
 err_console_dev = failed to access console
 err_dgn_oob = log message

src/config/Config.zig

@@ -51,3 +51,7 @@ xinitrc: ?[]const u8 = "~/.xinitrc",
 x_cmd_setup: []const u8 = build_options.data_directory ++ "/xsetup.sh",
 xauth_cmd: []const u8 = "/usr/bin/xauth",
 xsessions: []const u8 = "/usr/share/xsessions",
+brightness_down_key: []const u8 = "F5",
+brightness_up_key: []const u8 = "F6",
+brightnessctl: []const u8 = "/usr/bin/brightnessctl",
+brightness_change: []const u8 = "10",

src/config/Lang.zig

@@ -2,6 +2,7 @@ authenticating: []const u8 = "authenticating...",
 capslock: []const u8 = "capslock",
 err_alloc: []const u8 = "failed memory allocation",
 err_bounds: []const u8 = "out-of-bounds index",
+err_brightness_change: []const u8 = "failed to change brightness",
 err_chdir: []const u8 = "failed to open home folder",
 err_console_dev: []const u8 = "failed to access console",
 err_dgn_oob: []const u8 = "log message",
@@ -54,3 +55,5 @@ sleep: []const u8 = "sleep",
 wayland: []const u8 = "wayland",
 xinitrc: [:0]const u8 = "xinitrc",
 x11: []const u8 = "x11",
+brightness_down: []const u8 = "decrease brightness",
+brightness_up: []const u8 = "increase brightness",

src/interop.zig

@@ -16,6 +16,10 @@ pub const xcb = @cImport({
     @cInclude("xcb/xcb.h");
 });
 
+pub const unistd = @cImport({
+    @cInclude("unistd.h");
+});
+
 pub const c_size = u64;
 pub const c_uid = u32;
 pub const c_gid = u32;

src/main.zig

@@ -21,6 +21,7 @@ const utils = @import("tui/utils.zig");
 
 const Ini = ini.Ini;
 const termbox = interop.termbox;
+const unistd = interop.unistd;
 
 var session_pid: std.posix.pid_t = -1;
 pub fn signalHandler(i: c_int) callconv(.C) void {
@@ -245,6 +246,10 @@ pub fn main() !void {
     const restart_key = try std.fmt.parseInt(u8, config.restart_key[1..], 10);
     const restart_len = try utils.strWidth(lang.restart);
     const sleep_key = try std.fmt.parseInt(u8, config.sleep_key[1..], 10);
+    const brightness_down_key = try std.fmt.parseInt(u8, config.brightness_down_key[1..], 10);
+    const brightness_down_len = try utils.strWidth(lang.brightness_down);
+    const brightness_up_key = try std.fmt.parseInt(u8, config.brightness_up_key[1..], 10);
+    const brightness_up_len = try utils.strWidth(lang.brightness_up);
 
     var event: termbox.tb_event = undefined;
     var run = true;
@@ -388,6 +393,20 @@ pub fn main() !void {
                     buffer.drawLabel(lang.restart, length, 0);
                     length += restart_len + 1;
 
+                    buffer.drawLabel(config.brightness_down_key, length, 0);
+                    length += config.brightness_down_key.len + 1;
+                    buffer.drawLabel(" ", length - 1, 0);
+
+                    buffer.drawLabel(lang.brightness_down, length, 0);
+                    length += brightness_down_len + 1;
+
+                    buffer.drawLabel(config.brightness_up_key, length, 0);
+                    length += config.brightness_up_key.len + 1;
+                    buffer.drawLabel(" ", length - 1, 0);
+
+                    buffer.drawLabel(lang.brightness_up, length, 0);
+                    length += brightness_up_len + 1;
+
                     if (config.sleep_cmd != null) {
                         buffer.drawLabel(config.sleep_key, length, 0);
                         length += config.sleep_key.len + 1;
@@ -482,6 +501,22 @@ pub fn main() !void {
                         var sleep = std.ChildProcess.init(&[_][]const u8{ "/bin/sh", "-c", sleep_cmd }, allocator);
                         _ = sleep.spawnAndWait() catch .{};
                     }
+                } else if (pressed_key == brightness_down_key and unistd.access(&config.brightnessctl[0], unistd.X_OK) == 0) brightness_change: {
+                    const brightness_str = std.fmt.allocPrint(allocator, "{s}%-", .{config.brightness_change}) catch {
+                        try info_line.setText(lang.err_brightness_change);
+                        break :brightness_change;
+                    };
+                    defer allocator.free(brightness_str);
+                    var brightness = std.ChildProcess.init(&[_][]const u8{ config.brightnessctl, "-q", "s", brightness_str }, allocator);
+                    _ = brightness.spawnAndWait() catch .{};
+                } else if (pressed_key == brightness_up_key and unistd.access(&config.brightnessctl[0], unistd.X_OK) == 0) brightness_change: {
+                    const brightness_str = std.fmt.allocPrint(allocator, "+{s}%", .{config.brightness_change}) catch {
+                        try info_line.setText(lang.err_brightness_change);
+                        break :brightness_change;
+                    };
+                    defer allocator.free(brightness_str);
+                    var brightness = std.ChildProcess.init(&[_][]const u8{ config.brightnessctl, "-q", "s", brightness_str }, allocator);
+                    _ = brightness.spawnAndWait() catch .{};
                 }
             },
             termbox.TB_KEY_CTRL_C => run = false,