Remove DUB from D template.

cli/assets/templates/d/Makefile

@@ -1,12 +1,7 @@
-DUB_FLAGS = --quiet --arch wasm32-unknown-unknown-wasm --build release
-ifneq ($(origin WASI_SDK_PATH), undefined)
-	override DUB_FLAGS += --config wasi
-endif
+.PHONY: build clean
 
-# Just rebuild every time because it's fast.
-# cart.wasm: Makefile dub.json $(wildcard source/*.d)
 build:
-	dub build ${DUB_FLAGS}
+	./build
 
 clean:
-	rm -rf cart.wasm .dub
+	rm -rf cart.wasm cart.o

cli/assets/templates/d/build

@@ -0,0 +1,31 @@
+#!/bin/env sh
+set -e
+
+## A WASM-4 project should look like this:
+##    +- Folder -------+
+##    | source/app.d   |
+##    | source/wasm4.d |
+##    | build          |
+##    +----------------+
+
+output="cart.wasm"
+source="source"
+ files="source/app.d"
+ flags=""
+
+cd "$(dirname "$0")"
+ldc2 -of=$output \
+    $files $flags -I=$source \
+    -i -betterC \
+    --mtriple=wasm32 \
+    --checkaction=halt \
+    --d-version=JokaSmallFootprint \
+    --d-version=JokaMathStubs \
+    -L--export=update \
+    -L--strip-all \
+    -L--no-entry \
+    -L--stack-first \
+    -L--import-memory \
+    -L--initial-memory=65536 \
+    -L--max-memory=65536 \
+    -L-zstack-size=14752

cli/assets/templates/d/build.bat

@@ -0,0 +1,33 @@
+@echo off
+setlocal enabledelayedexpansion
+
+:: A WASM-4 project should look like this:
+::    +- Folder -------+
+::    | source\app.d   |
+::    | source\wasm4.d |
+::    | build.bat      |
+::    +----------------+
+
+set "output=cart.wasm"
+set "source=source"
+set "files=source\app.d"
+set "flags="
+
+:: Change directory to where the script is located
+cd /d "%~dp0"
+
+ldc2 -of=%output% ^
+    %files% %flags% -I=%source% ^
+    -i -betterC ^
+    --mtriple=wasm32 ^
+    --checkaction=halt ^
+    --d-version=JokaSmallFootprint ^
+    --d-version=JokaMathStubs ^
+    -L--export=update ^
+    -L--strip-all ^
+    -L--no-entry ^
+    -L--stack-first ^
+    -L--import-memory ^
+    -L--initial-memory=65536 ^
+    -L--max-memory=65536 ^
+    -L-zstack-size=14752

cli/assets/templates/d/source/wasm4.d

@@ -1,6 +1,16 @@
 module wasm4;
 
-extern(C):
+private {
+    version (LDC) {
+        import ldc = ldc.attributes;
+        private alias llvmAttr = ldc.llvmAttr;
+    } else {
+        private struct llvmAttr { immutable(char)[] a, b; }
+    }
+
+    enum wasm4 = llvmAttr("wasm-import-module", "env");
+    auto importName(immutable(char)[] name) => llvmAttr("wasm-import-name", name);
+}
 
 // ┌───────────────────────────────────────────────────────────────────────────┐
 // │                                                                           │
@@ -50,47 +60,62 @@ enum systemHideGamepadOverlay = 2;
 // │                                                                           │
 // └───────────────────────────────────────────────────────────────────────────┘
 
-/** Copies pixels to the framebuffer. */
-void blit(const ubyte* data, int x, int y, uint width, uint height, uint flags);
+extern(C) nothrow @nogc @wasm4 {
+    /** Copies pixels to the framebuffer. */
+    @importName("blit")
+    void blit(const ubyte* data, int x, int y, uint width, uint height, uint flags);
 
-/** Copies a subregion within a larger sprite atlas to the framebuffer. */
-void blitSub(
-    const ubyte* data, int x, int y, uint width, uint height,
-    uint srcX, uint srcY, uint stride, uint flags,
-);
+    /** Copies a subregion within a larger sprite atlas to the framebuffer. */
+    @importName("blitSub")
+    void blitSub(
+        const ubyte* data, int x, int y, uint width, uint height,
+        uint srcX, uint srcY, uint stride, uint flags,
+    );
+}
 
 enum blit2Bpp = 1;
 enum blit1Bpp = 0;
 enum blitFlipX = 2;
 enum blitFlipY = 4;
 enum blitRotate = 8;
 
-/** Draws a line between two points. */
-void line(int x1, int y1, int x2, int y2);
+extern(C) nothrow @nogc @wasm4 {
+    /** Draws a line between two points. */
+    @importName("line")
+    void line(int x1, int y1, int x2, int y2);
 
-/** Draws a horizontal line. */
-void hline(int x, int y, uint len);
+    /** Draws a horizontal line. */
+    @importName("hline")
+    void hline(int x, int y, uint len);
 
-/** Draws a vertical line. */
-void vline(int x, int y, uint len);
+    /** Draws a vertical line. */
+    @importName("vline")
+    void vline(int x, int y, uint len);
 
-/** Draws an oval (or circle). */
-void oval(int x, int y, uint width, uint height);
+    /** Draws an oval (or circle). */
+    @importName("oval")
+    void oval(int x, int y, uint width, uint height);
 
-/** Draws a rectangle. */
-void rect(int x, int y, uint width, uint height);
+    /** Draws a rectangle. */
+    @importName("rect")
+    void rect(int x, int y, uint width, uint height);
 
-// /** Draws text using the built-in system font. */
-void text(const char* text, int x, int y);
+    // /** Draws text using the built-in system font. */
+    @importName("text")
+    void text(const char* text, int x, int y);
+}
 
 // ┌───────────────────────────────────────────────────────────────────────────┐
 // │                                                                           │
 // │ Sound Functions                                                           │
 // │                                                                           │
 // └───────────────────────────────────────────────────────────────────────────┘
 
-/** Plays a sound tone. */
-void tone(uint frequency, uint duration, uint volume, uint flags);
+extern(C) nothrow @nogc @wasm4 {
+    /** Plays a sound tone. */
+    @importName("tone")
+    void tone(uint frequency, uint duration, uint volume, uint flags);
+}
 
 enum tonePulse1 = 0;
 enum tonePulse2 = 1;
@@ -110,14 +135,20 @@ enum toneNoteMode = 64;
 // │                                                                           │
 // └───────────────────────────────────────────────────────────────────────────┘
 
-/** Reads up to `size` bytes from persistent storage into the pointer `destPtr`. */
-uint diskr(void* dest, uint size);
+extern(C) nothrow @nogc @wasm4 {
+    /** Reads up to `size` bytes from persistent storage into the pointer `destPtr`. */
+    @importName("diskr")
+    uint diskr(void* dest, uint size);
 
-/** Writes up to `size` bytes from the pointer `srcPtr` into persistent storage. */
-uint diskw(const void* src, uint size);
+    /** Writes up to `size` bytes from the pointer `srcPtr` into persistent storage. */
+    @importName("diskw")
+    uint diskw(const void* src, uint size);
 
-/** Prints a message to the debug console. */
-void trace(const char* str);
+    /** Prints a message to the debug console. */
+    @importName("trace")
+    void trace(const char* str);
 
-/** Prints a message to the debug console. */
-void tracef(const char* fmt, ...);
+    /** Prints a message to the debug console. */
+    @importName("tracef")
+    void tracef(const char* fmt, ...);
+}