Support new project for Moon

.gitignore

@@ -2,3 +2,4 @@
 /.task/
 /test_app/target/
 .zig-cache/
+/assets/target/

assets/main.mbt

@@ -0,0 +1,26 @@
+///|
+using @firefly {type Point, type Size, type Style}
+
+///|
+fn main {
+
+}
+
+///|
+pub fn boot() -> Unit {
+  // ...
+}
+
+///|
+pub fn update() -> Unit {
+  // ...
+}
+
+///|
+pub fn render() -> Unit {
+  @firefly.draw_rect(
+    Point::new(10, 10),
+    Size::new(40, 15),
+    Style::new_solid(LightGray),
+  )
+}

assets/moon.mod.json

@@ -0,0 +1,4 @@
+{
+  "name": "app",
+  "preferred-target": "wasm"
+}

assets/moon.pkg.json

@@ -0,0 +1,9 @@
+{
+  "is-main": true,
+  "import": ["applejag/firefly"],
+  "link": {
+    "wasm": {
+      "exports": ["boot", "update", "render"]
+    }
+  }
+}

src/commands/new.rs

@@ -29,7 +29,7 @@ pub fn cmd_new(args: &NewArgs) -> Result<()> {
         Lang::C => new_c(&args.name).context("new C project")?,
         Lang::Cpp => new_cpp(&args.name).context("new C++ project")?,
         Lang::Python => bail!("Python is not supported yet"),
-        Lang::Moon => bail!("Moon starter project is not supported yet"),
+        Lang::Moon => new_moon(&args.name).context("new Moon project")?,
     }
     write_config(&args.name)?;
     init_git(&args.name)?;
@@ -77,6 +77,7 @@ fn parse_lang(lang: &str) -> Result<Lang> {
         "ts" | "typescript" | "js" | "javascript" => Lang::TS,
         "cpp" | "c++" => Lang::Cpp,
         "python" | "py" => Lang::Python,
+        "moon" | "moonbit" => Lang::Moon,
         _ => bail!("unsupported language: {lang}"),
     };
     Ok(result)
@@ -145,6 +146,17 @@ fn new_c_or_cpp(name: &str, main: &str) -> Result<()> {
     Ok(())
 }
 
+fn new_moon(name: &str) -> Result<()> {
+    check_installed("Moon", "moon", "version")?;
+    let mut c = Commander::default();
+    c.cd(name)?;
+    c.copy_asset(&["main.mbt"], "main.mbt")?;
+    c.copy_asset(&["moon.mod.json"], "moon.mod.json")?;
+    c.copy_asset(&["moon.pkg.json"], "moon.pkg.json")?;
+    c.run(&["moon", "add", "applejag/firefly"])?;
+    Ok(())
+}
+
 #[derive(Default)]
 struct Commander<'a> {
     root: Option<&'a Path>,