examples: review, testing and documentation (#176)

* examples reviews, testing and documentation

* including the execution on travis, and fix readme

* fix example link

* including the execution on travis

1 files changed, 11 insertions, 62 deletions

diff --git a/examples/clone/main.go b/examples/clone/main.go
index 0fa5fe6..13257ca 100644
--- a/examples/clone/main.go
+++ b/examples/clone/main.go
@@ -2,87 +2,36 @@ package main
 
 import (
 	"fmt"
-	"io"
 	"os"
-	"path/filepath"
-
-	"github.com/fatih/color"
 
 	"gopkg.in/src-d/go-git.v4"
+	. "gopkg.in/src-d/go-git.v4/examples"
 )
 
 func main() {
-	checkArgs()
+	CheckArgs("<url>", "<directory>")
 	url := os.Args[1]
 	directory := os.Args[2]
 
 	r, err := git.NewFilesystemRepository(directory)
-	checkIfError(err)
+	CheckIfError(err)
 
-	// 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)
+	// Clone the given repository to the given directory
+	Info("git clone %s %s", url, directory)
 
 	err = r.Clone(&git.CloneOptions{
-		URL: url,
+		URL:   url,
+		Depth: 1,
 	})
-	checkIfError(err)
+
+	CheckIfError(err)
 
 	// ... retrieving the branch being pointed by HEAD
 	ref, err := r.Head()
-	checkIfError(err)
+	CheckIfError(err)
 	// ... retrieving the commit object
 	commit, err := r.Commit(ref.Hash())
-	checkIfError(err)
+	CheckIfError(err)
 
 	fmt.Println(commit)
-	os.Exit(0)
-
-	// ... 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)
-	}
 }