build: add support for building with 'b' codec in magefile

magefile.go

@@ -19,6 +19,7 @@ const (
 	buildDir  = "build"
 	ldflags   = "-s -w"
 	goVersion = "1.25"
+	bRepo     = "github.com/zarazaex69/b"
 )
 
 var (
@@ -36,7 +37,14 @@ func Build() error {
 // BuildCLI builds the olcrtc server/client binary.
 func BuildCLI() error {
 	mg.Deps(Deps)
-	return buildBinary("olcrtc", "./cmd/olcrtc", goos, goarch)
+	return buildBinary("olcrtc", "./cmd/olcrtc", goos, goarch, false)
+}
+
+// BuildB builds olcrtc with b codec support (requires libb.so).
+func BuildB() error {
+	mg.Deps(Deps)
+	mg.Deps(B.Build)
+	return buildBinary("olcrtc", "./cmd/olcrtc", goos, goarch, true)
 }
 
 // BuildUI builds the Fyne desktop UI binary.
@@ -61,7 +69,7 @@ func Cross() error {
 	}
 
 	for _, t := range targets {
-		if err := buildBinary("olcrtc", "./cmd/olcrtc", t.os, t.arch); err != nil {
+		if err := buildBinary("olcrtc", "./cmd/olcrtc", t.os, t.arch, false); err != nil {
 			return err
 		}
 	}
@@ -124,7 +132,7 @@ func Mobile() error {
 	)
 }
 
-func buildBinary(name, pkg, os_, arch string) error {
+func buildBinary(name, pkg, os_, arch string, withB bool) error {
 	if err := ensureBuildDir(); err != nil {
 		return err
 	}
@@ -133,14 +141,25 @@ func buildBinary(name, pkg, os_, arch string) error {
 	if os_ == "windows" {
 		ext = ".exe"
 	}
-	outName := fmt.Sprintf("%s-%s-%s%s", name, os_, arch, ext)
+	suffix := ""
+	if withB {
+		suffix = "-b"
+	}
+	outName := fmt.Sprintf("%s%s-%s-%s%s", name, suffix, os_, arch, ext)
 	out := filepath.Join(buildDir, outName)
-	fmt.Printf("building %s (%s/%s) -> %s\n", name, os_, arch, out)
+	fmt.Printf("building %s (%s/%s, b=%v) -> %s\n", name, os_, arch, withB, out)
 
 	env := map[string]string{
-		"GOOS":        os_,
-		"GOARCH":      arch,
-		"CGO_ENABLED": "0",
+		"GOOS":   os_,
+		"GOARCH": arch,
+	}
+
+	if withB {
+		env["CGO_ENABLED"] = "1"
+		bLibDir := bLibPath()
+		env["CGO_LDFLAGS"] = fmt.Sprintf("-L%s -Wl,-rpath,%s", bLibDir, bLibDir)
+	} else {
+		env["CGO_ENABLED"] = "0"
 	}
 
 	flags := ldflags
@@ -148,12 +167,13 @@ func buildBinary(name, pkg, os_, arch string) error {
 		flags += " -checklinkname=0"
 	}
 
-	return sh.RunWithV(env, goexe, "build",
-		"-trimpath",
-		"-ldflags", flags,
-		"-o", out,
-		pkg,
-	)
+	args := []string{"build", "-trimpath", "-ldflags", flags}
+	if withB {
+		args = append(args, "-tags", "b")
+	}
+	args = append(args, "-o", out, pkg)
+
+	return sh.RunWithV(env, goexe, args...)
 }
 
 func buildUIBinary(os_, arch string) error {
@@ -190,6 +210,68 @@ func buildUIBinary(os_, arch string) error {
 	return cmd.Run()
 }
 
+type B mg.Namespace
+
+func bLibPath() string {
+	return filepath.Join(buildDir, "lib")
+}
+
+func bSrcPath() string {
+	return filepath.Join(buildDir, "b-src")
+}
+
+func (B) Build() error {
+	if err := ensureBuildDir(); err != nil {
+		return err
+	}
+
+	libDir := bLibPath()
+	libPath := filepath.Join(libDir, "libb.so")
+	if _, err := os.Stat(libPath); err == nil {
+		fmt.Println("libb.so already exists, skipping build")
+		return nil
+	}
+
+	srcDir := bSrcPath()
+	if _, err := os.Stat(srcDir); os.IsNotExist(err) {
+		fmt.Println("cloning b repository...")
+		if err := sh.RunV("git", "clone", "--depth=1", "https://"+bRepo, srcDir); err != nil {
+			return fmt.Errorf("failed to clone b: %w", err)
+		}
+	}
+
+	fmt.Println("building libb.so with cargo...")
+	if err := sh.RunV("cargo", "build", "--release", "--manifest-path", filepath.Join(srcDir, "Cargo.toml")); err != nil {
+		return fmt.Errorf("cargo build failed: %w", err)
+	}
+
+	if err := os.MkdirAll(libDir, 0o755); err != nil {
+		return err
+	}
+
+	srcLib := filepath.Join(srcDir, "target", "release", "libb.so")
+	if err := sh.Copy(libPath, srcLib); err != nil {
+		return fmt.Errorf("failed to copy libb.so: %w", err)
+	}
+
+	fmt.Printf("libb.so installed to %s\n", libPath)
+	return nil
+}
+
+func (B) Clean() error {
+	srcDir := bSrcPath()
+	if _, err := os.Stat(srcDir); err == nil {
+		if err := os.RemoveAll(srcDir); err != nil {
+			return err
+		}
+	}
+	libPath := filepath.Join(bLibPath(), "libb.so")
+	if _, err := os.Stat(libPath); err == nil {
+		return os.Remove(libPath)
+	}
+	return nil
+}
+
 
 func ensureBuildDir() error {
 	return os.MkdirAll(buildDir, 0o755)