Brightness (Haiku): Implement

CMakeLists.txt

@@ -1205,7 +1205,7 @@ elseif(Haiku)
         src/detection/bios/bios_windows.c
         src/detection/board/board_windows.c
         src/detection/bootmgr/bootmgr_haiku.cpp
-        src/detection/brightness/brightness_nosupport.c
+        src/detection/brightness/brightness_haiku.cpp
         src/detection/btrfs/btrfs_nosupport.c
         src/detection/chassis/chassis_windows.c
         src/detection/cpu/cpu_haiku.c

src/detection/brightness/brightness_haiku.cpp

@@ -0,0 +1,46 @@
+extern "C" {
+#include "brightness.h"
+#include "common/strutil.h"
+}
+
+#include <Application.h>
+#include <Screen.h>
+
+const char* ffDetectBrightness(FF_A_UNUSED FFBrightnessOptions* options, FFlist* result) {
+    // We need a valid be_app to query the app_server here.
+    BApplication app("application/x-vnd.fastfetch-cli-fastfetch");
+    BScreen screen{}; // default screen is the main one
+
+    do {
+        if (!screen.IsValid()) {
+            continue;
+        }
+
+        float value = 1.0f;
+        status_t status = screen.GetBrightness(&value);
+        if (status != B_OK) {
+            continue;
+        }
+
+        monitor_info monitor;
+        // WARNING: This is experimental new Haiku API
+        status_t err = screen.GetMonitorInfo(&monitor);
+
+        FFBrightnessResult* brightness = FF_LIST_ADD(FFBrightnessResult, *result);
+
+        if (err == B_OK) {
+            ffStrbufInitF(&brightness->name, "%s %s (%ld)", monitor.vendor, monitor.name, screen.ID().id);
+            ffStrbufTrimRightSpace(&brightness->name);
+        } else {
+            ffStrbufInitF(&brightness->name, "Screen %ld", screen.ID().id);
+        }
+
+        brightness->max = 1.0f;
+        brightness->min = 0.0f;
+        brightness->current = value;
+        brightness->builtin = true;
+
+    } while (screen.SetToNext() == B_OK);
+
+    return NULL;
+}