Add runtime => run

runtime/source/go/golang.go

@@ -0,0 +1,93 @@
+// Package golang is a source for Go
+package golang
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/micro/go-run/source"
+)
+
+type Source struct {
+	Options source.Options
+	// Go Command
+	Cmd  string
+	Path string
+}
+
+func (g *Source) Fetch(url string) (*source.Repository, error) {
+	purl := url
+
+	if parts := strings.Split(url, "://"); len(parts) > 1 {
+		purl = parts[len(parts)-1]
+	}
+
+	// name of repo
+	name := filepath.Base(url)
+	// local path of repo
+	path := filepath.Join(g.Path, purl)
+	args := []string{"get", "-d", url, path}
+
+	cmd := exec.Command(g.Cmd, args...)
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+	return &source.Repository{
+		Name: name,
+		Path: path,
+		URL:  url,
+	}, nil
+}
+
+// Commit is not yet supported
+func (g *Source) Commit(r *source.Repository) error {
+	return nil
+}
+
+func (g *Source) String() string {
+	return "golang"
+}
+
+// whichGo locates the go command
+func whichGo() string {
+	// check GOROOT
+	if gr := os.Getenv("GOROOT"); len(gr) > 0 {
+		return filepath.Join(gr, "bin", "go")
+	}
+
+	// check path
+	for _, p := range filepath.SplitList(os.Getenv("PATH")) {
+		bin := filepath.Join(p, "go")
+		if _, err := os.Stat(bin); err == nil {
+			return bin
+		}
+	}
+
+	// best effort
+	return "go"
+}
+
+func NewSource(opts ...source.Option) source.Source {
+	options := source.Options{
+		Path: os.TempDir(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+
+	cmd := whichGo()
+	path := options.Path
+
+	// point of no return
+	if len(cmd) == 0 {
+		panic("Could not find Go executable")
+	}
+
+	return &Source{
+		Options: options,
+		Cmd:     cmd,
+		Path:    path,
+	}
+}