Refactor git into an interface (#146)

* Refactor git into an interface

git/git.go

@@ -0,0 +1,72 @@
+package git
+
+import (
+	"os"
+	"os/exec"
+
+	"github.com/gabrie30/ghorg/scm"
+)
+
+type Gitter interface {
+	Clone(scm.Repo) error
+	Reset(scm.Repo) error
+	Pull(scm.Repo) error
+	SetOrigin(scm.Repo) error
+	Clean(scm.Repo) error
+	Checkout(scm.Repo) error
+	UpdateRemote(scm.Repo) error
+}
+
+type GitClient struct{}
+
+func NewGit() GitClient {
+	return GitClient{}
+}
+
+func (g GitClient) Clone(repo scm.Repo) error {
+	args := []string{"clone", repo.CloneURL, repo.HostPath}
+	if os.Getenv("GHORG_BACKUP") == "true" {
+		args = append(args, "--mirror")
+	}
+
+	cmd := exec.Command("git", args...)
+	err := cmd.Run()
+	return err
+}
+
+func (g GitClient) SetOrigin(repo scm.Repo) error {
+	args := []string{"remote", "set-url", "origin", repo.URL}
+	cmd := exec.Command("git", args...)
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}
+
+func (g GitClient) Checkout(repo scm.Repo) error {
+	cmd := exec.Command("git", "checkout", repo.CloneBranch)
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}
+
+func (g GitClient) Clean(repo scm.Repo) error {
+	cmd := exec.Command("git", "clean", "-f", "-d")
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}
+
+func (g GitClient) UpdateRemote(repo scm.Repo) error {
+	cmd := exec.Command("git", "remote", "update")
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}
+
+func (g GitClient) Pull(repo scm.Repo) error {
+	cmd := exec.Command("git", "pull", "origin", repo.CloneBranch)
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}
+
+func (g GitClient) Reset(repo scm.Repo) error {
+	cmd := exec.Command("git", "reset", "--hard", "origin/"+repo.CloneBranch)
+	cmd.Dir = repo.HostPath
+	return cmd.Run()
+}