remote: add Push (#178)

* remote: add Push.

* add Push method to Remote.
* add method Push to Repository.
* examples: add push example.

* requested changes

* add tests, fixes

1 files changed, 23 insertions, 0 deletions

diff --git a/examples/common_test.go b/examples/common_test.go
index e75b492..9ec1f05 100644
--- a/examples/common_test.go
+++ b/examples/common_test.go
@@ -2,6 +2,7 @@ package examples
 
 import (
 	"flag"
+	"fmt"
 	"go/build"
 	"io/ioutil"
 	"os"
@@ -20,6 +21,7 @@ var args = map[string][]string{
 	"clone":       []string{defaultURL, tempFolder()},
 	"progress":    []string{defaultURL, tempFolder()},
 	"open":        []string{filepath.Join(cloneRepository(defaultURL, tempFolder()), ".git")},
+	"push":        []string{setEmptyRemote(filepath.Join(cloneRepository(defaultURL, tempFolder()), ".git"))},
 }
 
 var ignored = map[string]bool{
@@ -85,6 +87,27 @@ func cloneRepository(url, folder string) string {
 	return folder
 }
 
+func createBareRepository(dir string) string {
+	cmd := exec.Command("git", "init", "--bare", dir)
+	err := cmd.Run()
+	CheckIfError(err)
+
+	return dir
+}
+
+func setEmptyRemote(dir string) string {
+	remote := createBareRepository(tempFolder())
+	setRemote(dir, fmt.Sprintf("file://%s", remote))
+	return dir
+}
+
+func setRemote(local, remote string) {
+	cmd := exec.Command("git", "remote", "set-url", "origin", remote)
+	cmd.Dir = local
+	err := cmd.Run()
+	CheckIfError(err)
+}
+
 func testExample(t *testing.T, name, example string) {
 	cmd := exec.Command("go", append([]string{
 		"run", filepath.Join(example),