feat(newproject): add archduino new project scaffolder

internal/subcommands/newproject/assets/default.ino

@@ -0,0 +1,9 @@
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) { ; }
+  Serial.println("Hello from Arduino!");
+}
+
+void loop() {
+  // Your code here
+}

internal/subcommands/newproject/assets/esp32.ino

@@ -0,0 +1,22 @@
+#include <WiFi.h>
+
+const char* ssid = "YOUR_SSID";
+const char* password = "YOUR_PASS";
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+  WiFi.begin(ssid, password);
+  Serial.print("Connecting to WiFi");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+  Serial.print("Connected! IP: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  delay(1000);
+}

internal/subcommands/newproject/assets/esp32s3.ino

@@ -0,0 +1,9 @@
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) { ; }
+  Serial.println("Hello from Arduino!");
+}
+
+void loop() {
+  // Your code here
+}

internal/subcommands/newproject/assets/esp8266.ino

@@ -0,0 +1,22 @@
+#include <ESP8266WiFi.h>
+
+const char* ssid = "YOUR_SSID";
+const char* password = "YOUR_PASS";
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+  WiFi.begin(ssid, password);
+  Serial.print("Connecting to WiFi");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+  Serial.print("Connected! IP: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  delay(1000);
+}

internal/subcommands/newproject/assets/mega.ino

@@ -0,0 +1,9 @@
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) { ; }
+  Serial.println("Hello from Arduino!");
+}
+
+void loop() {
+  // Your code here
+}

internal/subcommands/newproject/assets/nano.ino

@@ -0,0 +1,9 @@
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) { ; }
+  Serial.println("Hello from Arduino!");
+}
+
+void loop() {
+  // Your code here
+}

internal/subcommands/newproject/assets/uno.ino

@@ -0,0 +1,9 @@
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) { ; }
+  Serial.println("Hello from Arduino!");
+}
+
+void loop() {
+  // Your code here
+}

internal/subcommands/newproject/newproject.go

@@ -0,0 +1,75 @@
+// Package newproject scaffolds a new Arduino sketch directory.
+package newproject
+
+import (
+	"embed"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/config"
+	"github.com/MDietermann/ArduinoArchSetup/internal/platform"
+)
+
+//go:embed assets
+var assetsFS embed.FS
+
+const clangdContent = `CompileFlags:
+  Add:
+    - -xc++
+    - -std=c++17
+`
+
+// Run creates a new Arduino project directory. It errors if the project
+// directory already exists, if the board is unknown, or if the project name
+// contains a path separator.
+func Run(cfg config.Config, project, board string) error {
+	if project == "" {
+		return fmt.Errorf("project name required")
+	}
+	if strings.ContainsAny(project, "/\\") || strings.HasPrefix(project, ".") {
+		return fmt.Errorf("invalid project name %q", project)
+	}
+
+	var b *config.Board
+	var valid []string
+	for i := range cfg.Scaffolding.Boards {
+		bp := &cfg.Scaffolding.Boards[i]
+		valid = append(valid, bp.Name)
+		if bp.Name == board {
+			b = bp
+		}
+	}
+	if b == nil {
+		return fmt.Errorf("unknown board %q; valid: %s", board, strings.Join(valid, ", "))
+	}
+
+	if _, err := os.Stat(project); err == nil {
+		return fmt.Errorf("project directory %q already exists", project)
+	}
+	if err := os.MkdirAll(project, 0o755); err != nil {
+		return err
+	}
+
+	// Pick .ino template: try <template>.ino, else default.ino.
+	inoData, err := assetsFS.ReadFile(filepath.Join("assets", b.Template+".ino"))
+	if err != nil {
+		inoData, err = assetsFS.ReadFile("assets/default.ino")
+		if err != nil {
+			return err
+		}
+	}
+	if err := platform.WriteUserFile(filepath.Join(project, project+".ino"), inoData, 0o644); err != nil {
+		return err
+	}
+
+	sketch := fmt.Sprintf("default_fqbn: %s\ndefault_port: auto\n", b.FQBN)
+	if err := platform.WriteUserFile(filepath.Join(project, "sketch.yaml"), []byte(sketch), 0o644); err != nil {
+		return err
+	}
+	if err := platform.WriteUserFile(filepath.Join(project, ".clangd"), []byte(clangdContent), 0o644); err != nil {
+		return err
+	}
+	return nil
+}

internal/subcommands/newproject/newproject_test.go

@@ -0,0 +1,84 @@
+package newproject
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/MDietermann/ArduinoArchSetup/internal/config"
+)
+
+func sampleCfg() config.Config {
+	return config.Config{
+		Scaffolding: config.Scaffolding{Boards: []config.Board{
+			{Name: "uno", FQBN: "arduino:avr:uno", Template: "uno"},
+			{Name: "xyz", FQBN: "fake:fqbn:xyz", Template: "does-not-exist"},
+		}},
+	}
+}
+
+func TestRunCreatesProject(t *testing.T) {
+	dir := t.TempDir()
+	t.Chdir(dir)
+	if err := Run(sampleCfg(), "blinky", "uno"); err != nil {
+		t.Fatal(err)
+	}
+	ino, err := os.ReadFile(filepath.Join("blinky", "blinky.ino"))
+	if err != nil {
+		t.Fatalf("blinky.ino missing: %v", err)
+	}
+	if len(ino) == 0 {
+		t.Error("blinky.ino empty")
+	}
+	sketch, err := os.ReadFile(filepath.Join("blinky", "sketch.yaml"))
+	if err != nil {
+		t.Fatalf("sketch.yaml missing: %v", err)
+	}
+	if !strings.Contains(string(sketch), "arduino:avr:uno") {
+		t.Errorf("sketch.yaml missing fqbn: %s", sketch)
+	}
+	if _, err := os.Stat(filepath.Join("blinky", ".clangd")); err != nil {
+		t.Errorf(".clangd missing: %v", err)
+	}
+}
+
+func TestRunRefusesExistingDir(t *testing.T) {
+	dir := t.TempDir()
+	t.Chdir(dir)
+	os.Mkdir("blinky", 0o755)
+	if err := Run(sampleCfg(), "blinky", "uno"); err == nil {
+		t.Fatal("want error on existing dir")
+	}
+}
+
+func TestRunFallsBackToDefaultTemplate(t *testing.T) {
+	dir := t.TempDir()
+	t.Chdir(dir)
+	if err := Run(sampleCfg(), "thing", "xyz"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := os.Stat(filepath.Join("thing", "thing.ino")); err != nil {
+		t.Fatalf("thing.ino missing: %v", err)
+	}
+}
+
+func TestRunUnknownBoardErrors(t *testing.T) {
+	dir := t.TempDir()
+	t.Chdir(dir)
+	err := Run(sampleCfg(), "thing", "bogus")
+	if err == nil {
+		t.Fatal("want error")
+	}
+	if !strings.Contains(err.Error(), "uno") {
+		t.Errorf("error should list valid boards: %v", err)
+	}
+}
+
+func TestRunRejectsSlashInProjectName(t *testing.T) {
+	dir := t.TempDir()
+	t.Chdir(dir)
+	if err := Run(sampleCfg(), "bad/name", "uno"); err == nil {
+		t.Fatal("want error on slashes")
+	}
+}