Add a terminal

Makefile

@@ -27,14 +27,14 @@ DESTDIR ?= $(abspath build/dist)
 
 CFLAGS  = -Wall -Wextra -std=gnu11 -ffreestanding -O2 -fno-stack-protector \
           -fno-stack-check -fno-lto -fno-pie -m64 -march=x86-64 -mno-red-zone \
-          -isystem $(SDK_PATH)/include -Ilibnovaproto -Ilibtheme -Ilibui -Ilibapp -Ilibwidget -I.
+          -isystem $(SDK_PATH)/include -Ilibnovaproto -Ilibtheme -Ilibui -Ilibapp -Ilibwidget -Isrc -I.
 
 LDFLAGS = -m elf_x86_64 -nostdlib -static -no-pie -Ttext=0x40000000 \
           --no-dynamic-linker -z text -z max-page-size=0x1000 -e _start \
           -L$(SDK_PATH)/lib
 
 LIBS = obj/libnovaproto.a obj/libtheme.a obj/libui.a obj/libapp.a obj/libwidget.a
-APPS = nova.elf taskbar.elf wallpaperd.elf about.elf helloworld.elf
+APPS = nova.elf taskbar.elf wallpaperd.elf about.elf helloworld.elf terminal.elf
 
 all: bootstrap-sdk
 	$(MAKE) export-sdk

assets/terminal.conf

@@ -0,0 +1,9 @@
+# Terminal configuration for nova terminal
+# Supported keys: font, font_size, fg, bg, cursor
+# Colors can be specified as 0xAARRGGBB or decimal.
+
+font=/Library/Fonts/FiraCode-Regular.ttf
+font_size=14
+fg=0xFFCCCCCC
+bg=0xFF1E1E1E
+cursor=0xFFFFFFFF

libapp/app.c

@@ -48,6 +48,7 @@ struct NovaApp {
     AppTextCallback cb_text;
     AppPointerCallback cb_pointer;
     AppCloseCallback cb_close;
+    AppIdleCallback cb_idle;
 
     void *userdata;
 
@@ -375,6 +376,10 @@ int app_run(NovaApp *app) {
             }
         }
 
+        if (app->cb_idle) {
+            app->cb_idle(app);
+        }
+
         if (app->dirty) {
             _do_draw(app);
         }
@@ -426,6 +431,10 @@ void app_on_close(NovaApp *app, AppCloseCallback cb) {
     if (app) app->cb_close = cb;
 }
 
+void app_on_idle(NovaApp *app, AppIdleCallback cb) {
+    if (app) app->cb_idle = cb;
+}
+
 // WM
 
 void app_set_title(NovaApp *app, const char *title) {

libapp/app.h

@@ -31,6 +31,9 @@ typedef void (*AppPointerCallback)(NovaApp *app, int x, int y, uint32_t buttons)
 // Return true to allow the close, false to cancel it.
 typedef bool (*AppCloseCallback)(NovaApp *app);
 
+// Called once per event-loop iteration (before redraw). Use for polling I/O.
+typedef void (*AppIdleCallback)(NovaApp *app);
+
 // Create a new application window with the given title and initial dimensions.
 // Loads the system theme automatically. Returns NULL on failure.
 NovaApp *app_create(const char *title, uint32_t width, uint32_t height);
@@ -55,6 +58,7 @@ void app_on_key(NovaApp *app, AppKeyCallback cb);
 void app_on_text(NovaApp *app, AppTextCallback cb);
 void app_on_pointer(NovaApp *app, AppPointerCallback cb);
 void app_on_close(NovaApp *app, AppCloseCallback cb);
+void app_on_idle(NovaApp *app, AppIdleCallback cb);
 
 // Change the window title at runtime.
 void app_set_title(NovaApp *app, const char *title);