Update import paths from github.com/go-gitea to code.gitea.io (#135)

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

vendor/code.gitea.io/git/repo_branch.go

@@ -0,0 +1,119 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/mcuadros/go-version"
+)
+
+const BRANCH_PREFIX = "refs/heads/"
+
+// IsReferenceExist returns true if given reference exists in the repository.
+func IsReferenceExist(repoPath, name string) bool {
+	_, err := NewCommand("show-ref", "--verify", name).RunInDir(repoPath)
+	return err == nil
+}
+
+// IsBranchExist returns true if given branch exists in the repository.
+func IsBranchExist(repoPath, name string) bool {
+	return IsReferenceExist(repoPath, BRANCH_PREFIX+name)
+}
+
+func (repo *Repository) IsBranchExist(name string) bool {
+	return IsBranchExist(repo.Path, name)
+}
+
+// Branch represents a Git branch.
+type Branch struct {
+	Name string
+	Path string
+}
+
+// GetHEADBranch returns corresponding branch of HEAD.
+func (repo *Repository) GetHEADBranch() (*Branch, error) {
+	stdout, err := NewCommand("symbolic-ref", "HEAD").RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+	stdout = strings.TrimSpace(stdout)
+
+	if !strings.HasPrefix(stdout, BRANCH_PREFIX) {
+		return nil, fmt.Errorf("invalid HEAD branch: %v", stdout)
+	}
+
+	return &Branch{
+		Name: stdout[len(BRANCH_PREFIX):],
+		Path: stdout,
+	}, nil
+}
+
+// SetDefaultBranch sets default branch of repository.
+func (repo *Repository) SetDefaultBranch(name string) error {
+	if version.Compare(gitVersion, "1.7.10", "<") {
+		return ErrUnsupportedVersion{"1.7.10"}
+	}
+
+	_, err := NewCommand("symbolic-ref", "HEAD", BRANCH_PREFIX+name).RunInDir(repo.Path)
+	return err
+}
+
+// GetBranches returns all branches of the repository.
+func (repo *Repository) GetBranches() ([]string, error) {
+	stdout, err := NewCommand("show-ref", "--heads").RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	infos := strings.Split(stdout, "\n")
+	branches := make([]string, len(infos)-1)
+	for i, info := range infos[:len(infos)-1] {
+		fields := strings.Fields(info)
+		if len(fields) != 2 {
+			continue // NOTE: I should believe git will not give me wrong string.
+		}
+		branches[i] = strings.TrimPrefix(fields[1], BRANCH_PREFIX)
+	}
+	return branches, nil
+}
+
+// Option(s) for delete branch
+type DeleteBranchOptions struct {
+	Force bool
+}
+
+// DeleteBranch delete a branch by name on repository.
+func (repo *Repository) DeleteBranch(name string, opts DeleteBranchOptions) error {
+	cmd := NewCommand("branch", "-d")
+
+	if opts.Force {
+		cmd.AddArguments("-f")
+	}
+
+	cmd.AddArguments(name)
+	_, err := cmd.RunInDir(repo.Path)
+
+	return err
+}
+
+// AddRemote adds a new remote to repository.
+func (repo *Repository) AddRemote(name, url string, fetch bool) error {
+	cmd := NewCommand("remote", "add")
+	if fetch {
+		cmd.AddArguments("-f")
+	}
+	cmd.AddArguments(name, url)
+
+	_, err := cmd.RunInDir(repo.Path)
+	return err
+}
+
+// RemoveRemote removes a remote from repository.
+func (repo *Repository) RemoveRemote(name string) error {
+	_, err := NewCommand("remote", "remove", name).RunInDir(repo.Path)
+	return err
+}