php langhelper (needs funcy/php), tutorial

fn/langs/base.go

@@ -11,6 +11,8 @@ func GetLangHelper(lang string) LangHelper {
 		return &RubyLangHelper{}
 	case "python":
 		return &PythonHelper{}
+	case "php":
+		return &PhpLangHelper{}
 	case "rust":
 		return &RustLangHelper{}
 	case "dotnet":

fn/langs/php.go

@@ -0,0 +1,49 @@
+package langs
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type PhpLangHelper struct {
+	BaseHelper
+}
+
+func (lh *PhpLangHelper) Entrypoint() string {
+	return "php func.php"
+}
+
+func (lh *PhpLangHelper) HasPreBuild() bool {
+	return true
+}
+
+func (lh *PhpLangHelper) PreBuild() error {
+	wd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+
+	if !exists(filepath.Join(wd, "composer.json")) {
+		return nil
+	}
+
+	pbcmd := fmt.Sprintf("docker run --rm -v %s:/worker -w /worker funcy/php:dev composer install", wd)
+	fmt.Println("Running prebuild command:", pbcmd)
+	parts := strings.Fields(pbcmd)
+	head := parts[0]
+	parts = parts[1:len(parts)]
+	cmd := exec.Command(head, parts...)
+	cmd.Stderr = os.Stderr
+	cmd.Stdout = os.Stdout
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("error running docker build: %v", err)
+	}
+	return nil
+}
+
+func (lh *PhpLangHelper) AfterBuild() error {
+	return nil
+}