examples: new clone example

2 files changed, 94 insertions, 0 deletions

diff --git a/commit.go b/commit.go
index 3e82a8a..8bb675a 100644
--- a/commit.go
+++ b/commit.go
@@ -60,6 +60,16 @@ func (c *Commit) File(path string) (*File, error) {
 	return tree.File(path)
 }
 
+// Files returns a FileIter allowing to iterate over the Tree
+func (c *Commit) Files() (*FileIter, error) {
+	tree, err := c.Tree()
+	if err != nil {
+		return nil, err
+	}
+
+	return tree.Files(), nil
+}
+
 // ID returns the object ID of the commit. The returned value will always match
 // the current value of Commit.Hash.
 //
diff --git a/examples/clone/main.go b/examples/clone/main.go
new file mode 100644
index 0000000..f95dc8f
--- /dev/null
+++ b/examples/clone/main.go
@@ -0,0 +1,84 @@
+package main
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/fatih/color"
+
+	"gopkg.in/src-d/go-git.v4"
+)
+
+func main() {
+	checkArgs()
+	url := os.Args[1]
+	directory := os.Args[2]
+
+	r := git.NewMemoryRepository()
+
+	// Clone the given repository, using depth we create a shallow clone :
+	// > git clone <url> --depth 1
+	color.Blue("git clone %s --depth 1 %s", url, directory)
+
+	err := r.Clone(&git.CloneOptions{
+		URL:   url,
+		Depth: 1,
+	})
+	checkIfError(err)
+
+	// ... retrieving the branch being pointed by HEAD
+	ref, err := r.Head()
+	checkIfError(err)
+	// ... retrieving the commit object
+	commit, err := r.Commit(ref.Hash())
+	checkIfError(err)
+
+	// ... we get all the files from the commit
+	files, err := commit.Files()
+	checkIfError(err)
+
+	// ... now we iterate the files to save to disk
+	err = files.ForEach(func(f *git.File) error {
+		abs := filepath.Join(directory, f.Name)
+		dir := filepath.Dir(abs)
+
+		os.MkdirAll(dir, 0777)
+		file, err := os.Create(abs)
+		if err != nil {
+			return err
+		}
+
+		defer file.Close()
+		r, err := f.Reader()
+		if err != nil {
+			return err
+		}
+
+		defer r.Close()
+
+		if err := file.Chmod(f.Mode); err != nil {
+			return err
+		}
+
+		_, err = io.Copy(file, r)
+		return err
+	})
+	checkIfError(err)
+}
+
+func checkIfError(err error) {
+	if err == nil {
+		return
+	}
+
+	color.Red("error: %s", err)
+	os.Exit(1)
+}
+
+func checkArgs() {
+	if len(os.Args) < 3 {
+		color.Cyan("Usage: %s <url> <directory>", os.Args[0])
+		os.Exit(1)
+	}
+}