Updated flake. Started modifying example

flake.nix

@@ -19,7 +19,17 @@
           overlays = [devkitNix.overlays.default];
         };
       in {
-        devShells.default = pkgs.mkShell.override {stdenv = pkgs.devkitNix.stdenvARM;} {packages = with pkgs; [imagemagick];};
+        devShells.default =
+          pkgs.mkShell.override {
+            stdenv = pkgs.devkitNix.stdenvARM;
+          } {
+            packages = with pkgs; [imagemagick];
+            shellHook = ''
+              # export DEVKITARM=${pkgs.devkitNix.devkitARM}
+              # export C_INCLUDE_PATH=$(find $DEVKITARM -type d -name include | tr '\n' ':'):$C_INCLUDE_PATH
+              # export LIBRARY_PATH=$(find $DEVKITARM -type d -name lib | tr '\n' ':'):$LIBRARY_PATH
+            '';
+          };
         packages.default = pkgs.devkitNix.stdenvARM.mkDerivation {
           name = "somding";
           src = ./.;

src/class.c

@@ -0,0 +1,33 @@
+typedef struct {
+  uint8_t room;
+  char subject[20];
+  int startDate;
+  int endDate;
+
+  C2D_Text classText_static[2];
+  C2D_Text classText_dynamic[1];
+
+  C2D_TextBuf g_static*;
+  C2D_TextBuf g_dynamic*;
+} lesson;
+
+lesson Lesson(
+  uint8_t room, 
+  char subject[20], 
+  int startDate, 
+  int endDate, 
+  C2D_TextBuf g_static*, 
+  C2D_TextBuf g_dynamic*
+) {
+  char roomStr[8]
+  sprintf(roomStr, "%d", room);
+
+  C2D_TextParse(&g_staticText[0], g_staticBuf, roomStr);
+  C2D_TextParse(&g_staticText[1], g_staticBuf, subject);
+
+  for (int i = 0; i < 3; i++)
+    C2D_TextOptimize(&g_staticText[i]);
+};
+void renderLesson(lesson Lesson*, int x, int y);
+
+

src/lesson.h

@@ -0,0 +1,18 @@
+#include <citro2d.h>
+
+typedef struct {
+  uint8_t room;
+  char subject[20];
+  int startDate;
+  int endDate;
+
+  C2D_Text classText_static[2];
+  C2D_Text classText_dynamic[1];
+
+  C2D_TextBuf g_static*;
+  C2D_TextBuf g_dynamic*;
+} lesson;
+
+lesson Lesson(uint8_t room, char subject[20], int startDate, int endDate, C2D_TextBuf g_static*, C2D_TextBuf g_dynamic*);
+void renderLesson(lesson Lesson*, int x, int y);
+

src/main.c

@@ -1,28 +1,95 @@
+#include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <3ds.h>
+#include <citro2d.h>
 
-int main(int argc, char* argv[])
+static const char *ordinalIndicators[] = {
+  "st",
+  "nd",
+  "rd",
+  "th"
+};
+
+u32 clrBg;
+u32 clrBg2;
+u32 clrFg;
+C2D_TextBuf g_staticBuf;
+C2D_Text g_staticText[3];
+C2D_Text g_staticText_hoursEnumerator[9];
+
+static void sceneInit(void) {
+  g_staticBuf = C2D_TextBufNew(3 * 9);
+  // g_dynamicBuf = C2D_TextBufNew(4096);
+
+  for (int i = 0; i < 9; i++) {
+    char str[3];
+    sprintf(str, "%d%s", i+1, ordinalIndicators[i < 4 ? i : 3]);
+    C2D_TextParse(&g_staticText[i], g_staticBuf, str);
+    C2D_TextOptimize(&g_staticText[i]);
+  };
+}
+
+static void colorInit(void) {
+  clrBg = C2D_Color32(0x1D, 0x23, 0x2A, 0xFF);  // #1d232a
+  clrBg = C2D_Color32(0xFF, 0xFF, 0xFF, 0xFF);  // #1d232a
+  clrBg2 = C2D_Color32(0x19, 0x1E, 0x24, 0xFF); // #191e24
+  clrFg = C2D_Color32f(0xEC, 0xF9, 0xFF, 0xFF);  // #ecf9ff
+};
+
+static void sceneExit(void)
 {
-	gfxInitDefault();
-	consoleInit(GFX_TOP, NULL);
+  C2D_TextBufDelete(g_staticBuf);
+}
 
-	printf("Hello, world!\n");
+static void sceneRender() {
+  for (int i = 0; i < 9; i++) {
+    C2D_DrawText(&g_staticText[i], C2D_AtBaseline | C2D_AlignJustified | C2D_WordWrap | C2D_WithColor, 100.0f, i*15.0f + 50.0f, 0.5f, 0.75f, 0.75f, 200.0f, clrFg);
+  };
+
+}
+
+int keyHandle() {
+  u32 kDown = hidKeysDown();
+  u32 kHeld = hidKeysHeld();
+
+  if (kDown & KEY_START)
+    return 1;
+
+  return 0;
+}
+
+int main() {
+  gfxInitDefault();
+  C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
+  C2D_Init(C2D_DEFAULT_MAX_OBJECTS);
+  C2D_Prepare();
+
+  C3D_RenderTarget* top = C2D_CreateScreenTarget(GFX_TOP, GFX_LEFT);
+
+  sceneInit();
+  colorInit();
 
   // Main loop
-	while (aptMainLoop())
-	{
-		gspWaitForVBlank();
-		gfxSwapBuffers();
+  while (aptMainLoop()) {
     hidScanInput();
 
-		// Your code goes here
-		u32 kDown = hidKeysDown();
-		if (kDown & KEY_START)
-			break; // break in order to return to hbmenu
+    // Respond to user input
+    if (keyHandle()) break;
+
+    // Render the scene
+    C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
+    C2D_TargetClear(top, clrBg);
+    C2D_SceneBegin(top);
+    sceneRender();
+    C3D_FrameEnd(0);
   }
 
+  // Deinitialize the scene
+  sceneExit();
+
+  C2D_Fini();
+  C3D_Fini();
   gfxExit();
   return 0;
 }