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_pull.go

@@ -0,0 +1,75 @@
+// 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 (
+	"container/list"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// PullRequestInfo represents needed information for a pull request.
+type PullRequestInfo struct {
+	MergeBase string
+	Commits   *list.List
+	NumFiles  int
+}
+
+// GetMergeBase checks and returns merge base of two branches.
+func (repo *Repository) GetMergeBase(base, head string) (string, error) {
+	stdout, err := NewCommand("merge-base", base, head).RunInDir(repo.Path)
+	return strings.TrimSpace(stdout), err
+}
+
+// GetPullRequestInfo generates and returns pull request information
+// between base and head branches of repositories.
+func (repo *Repository) GetPullRequestInfo(basePath, baseBranch, headBranch string) (_ *PullRequestInfo, err error) {
+	var remoteBranch string
+
+	// We don't need a temporary remote for same repository.
+	if repo.Path != basePath {
+		// Add a temporary remote
+		tmpRemote := strconv.FormatInt(time.Now().UnixNano(), 10)
+		if err = repo.AddRemote(tmpRemote, basePath, true); err != nil {
+			return nil, fmt.Errorf("AddRemote: %v", err)
+		}
+		defer repo.RemoveRemote(tmpRemote)
+
+		remoteBranch = "remotes/" + tmpRemote + "/" + baseBranch
+	} else {
+		remoteBranch = baseBranch
+	}
+
+	prInfo := new(PullRequestInfo)
+	prInfo.MergeBase, err = repo.GetMergeBase(remoteBranch, headBranch)
+	if err != nil {
+		return nil, fmt.Errorf("GetMergeBase: %v", err)
+	}
+
+	logs, err := NewCommand("log", prInfo.MergeBase+"..."+headBranch, _PRETTY_LOG_FORMAT).RunInDirBytes(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+	prInfo.Commits, err = repo.parsePrettyFormatLogToList(logs)
+	if err != nil {
+		return nil, fmt.Errorf("parsePrettyFormatLogToList: %v", err)
+	}
+
+	// Count number of changed files.
+	stdout, err := NewCommand("diff", "--name-only", remoteBranch+"..."+headBranch).RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+	prInfo.NumFiles = len(strings.Split(stdout, "\n")) - 1
+
+	return prInfo, nil
+}
+
+// GetPatch generates and returns patch data between given revisions.
+func (repo *Repository) GetPatch(base, head string) ([]byte, error) {
+	return NewCommand("diff", "-p", "--binary", base, head).RunInDirBytes(repo.Path)
+}