From 339e39d4962d5bdc9c38a9334a9c50e7b4d2184f Mon Sep 17 00:00:00 2001
From: ebits <tspamiitesh@gmail.com>
Date: Thu, 9 Oct 2025 18:48:46 +0200
Subject: [PATCH] Adding the battery status for the top bar alongside
 brightness controls (closes #821) (#826)

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/826
Reviewed-by: AnErrupTion <anerruption@disroot.org>
Co-authored-by: ebits <tspamiitesh@gmail.com>
Co-committed-by: ebits <tspamiitesh@gmail.com>
---
 res/config.ini        |  4 ++++
 res/lang/ar.ini       |  1 +
 res/lang/cat.ini      |  1 +
 res/lang/cs.ini       |  1 +
 res/lang/de.ini       |  1 +
 res/lang/en.ini       |  1 +
 res/lang/es.ini       |  1 +
 res/lang/fr.ini       |  1 +
 res/lang/it.ini       |  1 +
 res/lang/ja_JP.ini    |  1 +
 res/lang/pl.ini       |  1 +
 res/lang/pt.ini       |  1 +
 res/lang/pt_BR.ini    |  1 +
 res/lang/ro.ini       |  1 +
 res/lang/ru.ini       |  1 +
 res/lang/sr.ini       |  1 +
 res/lang/sv.ini       |  1 +
 res/lang/tr.ini       |  1 +
 res/lang/uk.ini       |  1 +
 res/lang/zh_CN.ini    |  1 +
 src/config/Config.zig |  1 +
 src/config/Lang.zig   |  1 +
 src/main.zig          | 32 ++++++++++++++++++++++++++++++++
 23 files changed, 57 insertions(+)

diff --git a/res/config.ini b/res/config.ini
index d4d1e6c..5d2d03e 100644
--- a/res/config.ini
+++ b/res/config.ini
@@ -189,6 +189,10 @@ hide_version_string = false
 # Remove power management command hints
 hide_key_hints = false
 
+# Set to null to disable battery status display
+# Default is BAT0, the typical identifier for the primary battery
+battery_id = null
+
 # Initial text to show on the info line
 # If set to null, the info line defaults to the hostname
 initial_info_text = null
diff --git a/res/lang/ar.ini b/res/lang/ar.ini
index 6e1f3f5..78d9e93 100644
--- a/res/lang/ar.ini
+++ b/res/lang/ar.ini
@@ -43,6 +43,7 @@ err_perm_user = فشل في تخفيض صلاحيات المستخدم (User per
 err_pwnam = فشل في جلب معلومات المستخدم
 err_sleep = فشل في تنفيذ أمر sleep
 
+
 err_tty_ctrl = فشل في نقل تحكم الطرفية (TTY)
 
 err_user_gid = فشل في تعيين معرّف المجموعة (GID) للمستخدم
diff --git a/res/lang/cat.ini b/res/lang/cat.ini
index c736153..fb829a6 100644
--- a/res/lang/cat.ini
+++ b/res/lang/cat.ini
@@ -45,6 +45,7 @@ err_pwnam = error en obtenir la informació de l'usuari
 
 
 
+
 err_user_gid = error en establir el GID de l'usuari
 err_user_init = error en inicialitzar usuari
 err_user_uid = error en establir l'UID de l'usuari
diff --git a/res/lang/cs.ini b/res/lang/cs.ini
index d9b9ae8..c1206fe 100644
--- a/res/lang/cs.ini
+++ b/res/lang/cs.ini
@@ -45,6 +45,7 @@ err_pwnam = nelze získat informace o uživateli
 
 
 
+
 err_user_gid = nastavení GID uživatele selhalo
 err_user_init = inicializace uživatele selhala
 err_user_uid = nastavení UID uživateli selhalo
diff --git a/res/lang/de.ini b/res/lang/de.ini
index 7d5e405..5512d5e 100644
--- a/res/lang/de.ini
+++ b/res/lang/de.ini
@@ -43,6 +43,7 @@ err_perm_user = Fehler beim Heruntersetzen der Nutzerberechtigungen
 err_pwnam = Abrufen der Benutzerinformationen fehlgeschlagen
 err_sleep = Sleep-Befehl fehlgeschlagen
 
+
 err_tty_ctrl = Fehler bei der TTY-Uebergabe
 
 err_user_gid = Fehler beim Setzen der Gruppen-ID
diff --git a/res/lang/en.ini b/res/lang/en.ini
index dfe60f3..1a8c16c 100644
--- a/res/lang/en.ini
+++ b/res/lang/en.ini
@@ -42,6 +42,7 @@ err_perm_group = failed to downgrade group permissions
 err_perm_user = failed to downgrade user permissions
 err_pwnam = failed to get user info
 err_sleep = failed to execute sleep command
+err_battery = failed to load battery status
 err_switch_tty = failed to switch tty
 err_tty_ctrl = tty control transfer failed
 err_no_users = no users found
diff --git a/res/lang/es.ini b/res/lang/es.ini
index c249c20..776c998 100644
--- a/res/lang/es.ini
+++ b/res/lang/es.ini
@@ -45,6 +45,7 @@ err_pwnam = error al obtener la información del usuario
 
 
 
+
 err_user_gid = error al establecer el GID del usuario
 err_user_init = error al inicializar usuario
 err_user_uid = error al establecer el UID del usuario
diff --git a/res/lang/fr.ini b/res/lang/fr.ini
index 1a5faba..87b7a93 100644
--- a/res/lang/fr.ini
+++ b/res/lang/fr.ini
@@ -42,6 +42,7 @@ err_perm_group = échec du déclassement des permissions de groupe
 err_perm_user = échec du déclassement des permissions utilisateur
 err_pwnam = échec de lecture des infos utilisateur
 err_sleep = échec de l'exécution de la commande de veille
+
 err_switch_tty = échec du changement de terminal
 err_tty_ctrl = échec du transfert de contrôle du terminal
 err_no_users = aucun utilisateur trouvé
diff --git a/res/lang/it.ini b/res/lang/it.ini
index b366c4f..4ba807c 100644
--- a/res/lang/it.ini
+++ b/res/lang/it.ini
@@ -45,6 +45,7 @@ err_pwnam = impossibile ottenere dati utente
 
 
 
+
 err_user_gid = impossibile impostare GID utente
 err_user_init = impossibile inizializzare utente
 err_user_uid = impossible impostare UID utente
diff --git a/res/lang/ja_JP.ini b/res/lang/ja_JP.ini
index 9a9555e..200422a 100644
--- a/res/lang/ja_JP.ini
+++ b/res/lang/ja_JP.ini
@@ -43,6 +43,7 @@ err_perm_user = ユーザー権限のダウングレードに失敗しました
 err_pwnam = ユーザー情報の取得に失敗しました
 err_sleep = スリープコマンドの実行に失敗しました
 
+
 err_tty_ctrl = TTY制御の転送に失敗しました
 
 err_user_gid = ユーザーGIDの設定に失敗しました
diff --git a/res/lang/pl.ini b/res/lang/pl.ini
index 7bf0a33..065fb22 100644
--- a/res/lang/pl.ini
+++ b/res/lang/pl.ini
@@ -43,6 +43,7 @@ err_perm_user = nie udało się obniżyć uprawnień użytkownika
 err_pwnam = nie udało się uzyskać informacji o użytkowniku
 err_sleep = nie udało się wykonać polecenia sleep
 
+
 err_tty_ctrl = nie udało się przekazać kontroli tty
 
 err_user_gid = nie udało się ustawić GID użytkownika
diff --git a/res/lang/pt.ini b/res/lang/pt.ini
index f8c9bd7..a1951fd 100644
--- a/res/lang/pt.ini
+++ b/res/lang/pt.ini
@@ -45,6 +45,7 @@ err_pwnam = erro ao obter informação do utilizador
 
 
 
+
 err_user_gid = erro ao definir o GID do utilizador
 err_user_init = erro ao iniciar o utilizador
 err_user_uid = erro ao definir o UID do utilizador
diff --git a/res/lang/pt_BR.ini b/res/lang/pt_BR.ini
index 0c64ca4..f886816 100644
--- a/res/lang/pt_BR.ini
+++ b/res/lang/pt_BR.ini
@@ -45,6 +45,7 @@ err_pwnam = não foi possível obter informações do usuário
 
 
 
+
 err_user_gid = não foi possível definir o GID do usuário
 err_user_init = não foi possível iniciar o usuário
 err_user_uid = não foi possível definir o UID do usuário
diff --git a/res/lang/ro.ini b/res/lang/ro.ini
index a90c54d..8503245 100644
--- a/res/lang/ro.ini
+++ b/res/lang/ro.ini
@@ -53,6 +53,7 @@ err_perm_user = nu s-a putut face downgrade permisiunilor de utilizator
 
 
 
+
 login = utilizator
 logout = opreşte sesiunea
 
diff --git a/res/lang/ru.ini b/res/lang/ru.ini
index 95116f1..dab497c 100644
--- a/res/lang/ru.ini
+++ b/res/lang/ru.ini
@@ -42,6 +42,7 @@ err_perm_group = не удалось понизить права доступа
 err_perm_user = не удалось понизить права доступа пользователя
 err_pwnam = не удалось получить информацию о пользователе
 err_sleep = не удалось выполнить команду sleep
+
 err_switch_tty = не удалось переключить tty
 err_tty_ctrl = передача управления tty не удалась
 err_no_users = пользователи не найдены
diff --git a/res/lang/sr.ini b/res/lang/sr.ini
index c99bf9e..1e3c6f7 100644
--- a/res/lang/sr.ini
+++ b/res/lang/sr.ini
@@ -45,6 +45,7 @@ err_pwnam = neuspijesno skupljanje informacija o korisniku
 
 
 
+
 err_user_gid = neuspijesno postavljanje korisničkog GID-a
 err_user_init = neuspijensa inicijalizacija korisnika
 err_user_uid = neuspijesno postavljanje UID-a korisnika
diff --git a/res/lang/sv.ini b/res/lang/sv.ini
index 81233fe..3fc2bfd 100644
--- a/res/lang/sv.ini
+++ b/res/lang/sv.ini
@@ -45,6 +45,7 @@ err_pwnam = misslyckades att hämta användarinfo
 
 
 
+
 err_user_gid = misslyckades att ställa in användar-GID
 err_user_init = misslyckades att initialisera användaren
 err_user_uid = misslyckades att ställa in användar-UID
diff --git a/res/lang/tr.ini b/res/lang/tr.ini
index 6759701..78de8c3 100644
--- a/res/lang/tr.ini
+++ b/res/lang/tr.ini
@@ -45,6 +45,7 @@ err_pwnam = kullanici bilgileri alinamadi
 
 
 
+
 err_user_gid = kullanici icin GID ayarlanamadi
 err_user_init = kullanici oturumu baslatilamadi
 err_user_uid = kullanici icin UID ayarlanamadi
diff --git a/res/lang/uk.ini b/res/lang/uk.ini
index af96e1f..de41076 100644
--- a/res/lang/uk.ini
+++ b/res/lang/uk.ini
@@ -45,6 +45,7 @@ err_pwnam = не вдалося отримати дані користувача
 
 
 
+
 err_user_gid = не вдалося змінити GID користувача
 err_user_init = не вдалося ініціалізувати користувача
 err_user_uid = не вдалося змінити UID користувача
diff --git a/res/lang/zh_CN.ini b/res/lang/zh_CN.ini
index 2d70f3f..5e77f8e 100644
--- a/res/lang/zh_CN.ini
+++ b/res/lang/zh_CN.ini
@@ -45,6 +45,7 @@ err_pwnam = 获取用户信息失败
 
 
 
+
 err_user_gid = 设置用户GID失败
 err_user_init = 初始化用户失败
 err_user_uid = 设置用户UID失败
diff --git a/src/config/Config.zig b/src/config/Config.zig
index 296a9c7..4dfab4d 100644
--- a/src/config/Config.zig
+++ b/src/config/Config.zig
@@ -49,6 +49,7 @@ gameoflife_initial_density: f32 = 0.4,
 hide_borders: bool = false,
 hide_version_string: bool = false,
 hide_key_hints: bool = false,
+battery_id: ?[]const u8 = "BAT0",
 initial_info_text: ?[]const u8 = null,
 input_len: u8 = 34,
 lang: []const u8 = "en",
diff --git a/src/config/Lang.zig b/src/config/Lang.zig
index 0e9b840..886644d 100644
--- a/src/config/Lang.zig
+++ b/src/config/Lang.zig
@@ -47,6 +47,7 @@ err_perm_group: []const u8 = "failed to downgrade group permissions",
 err_perm_user: []const u8 = "failed to downgrade user permissions",
 err_pwnam: []const u8 = "failed to get user info",
 err_sleep: []const u8 = "failed to execute sleep command",
+err_battery: []const u8 = "failed to load battery status",
 err_switch_tty: []const u8 = "failed to switch tty",
 err_tty_ctrl: []const u8 = "tty control transfer failed",
 err_no_users: []const u8 = "no users found",
diff --git a/src/main.zig b/src/main.zig
index fff3857..3b71540 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -572,6 +572,22 @@ pub fn main() !void {
                 length += ly_top_str.len + 1;
             }
 
+            var battery_bar_shown = false;
+            if (config.battery_id) |id| draw_battery: {
+                const battery_percentage = getBatteryPercentage(id) catch |err| {
+                    try log_writer.print("failed to get battery percentage: {s}\n", .{@errorName(err)});
+                    try info_line.addMessage(lang.err_battery, config.error_bg, config.error_fg);
+                    break :draw_battery;
+                };
+
+                var battery_buf: [16:0]u8 = undefined;
+                const battery_str = std.fmt.bufPrintZ(&battery_buf, "BAT: {d}%", .{battery_percentage}) catch break :draw_battery;
+
+                const battery_y: usize = 1;
+                buffer.drawLabel(battery_str, 0, battery_y);
+                battery_bar_shown = true;
+            }
+
             if (config.bigclock != .none and buffer.box_height + (bigclock.HEIGHT + 2) * 2 < buffer.height) {
                 var format_buf: [16:0]u8 = undefined;
                 var clock_buf: [32:0]u8 = undefined;
@@ -1162,6 +1178,22 @@ fn adjustBrightness(allocator: std.mem.Allocator, cmd: []const u8) !void {
     }
 }
 
+fn getBatteryPercentage(battery_id: []const u8) !u8 {
+    const path = try std.fmt.allocPrint(temporary_allocator, "/sys/class/power_supply/{s}/capacity", .{battery_id});
+    defer temporary_allocator.free(path);
+
+    const battery_file = try std.fs.cwd().openFile(path, .{});
+    defer battery_file.close();
+
+    var buffer: [8]u8 = undefined;
+    const bytes_read = try battery_file.read(&buffer);
+    const capacity_str = buffer[0..bytes_read];
+
+    const trimmed = std.mem.trimRight(u8, capacity_str, "\n\r");
+
+    return try std.fmt.parseInt(u8, trimmed, 10);
+}
+
 fn getAuthErrorMsg(err: anyerror, lang: Lang) []const u8 {
     return switch (err) {
         error.GetPasswordNameFailed => lang.err_pwnam,