Create new branch from branch selection dropdown (#2130)

* Create new branch from branch selection dropdown and rewrite it to VueJS

* Make updateLocalCopyToCommit as not exported

* Move branch name validation to model

* Fix possible race condition

integrations/repo_branch_test.go

@@ -0,0 +1,132 @@
+// Copyright 2017 The Gitea 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 integrations
+
+import (
+	"net/http"
+	"path"
+	"strings"
+	"testing"
+
+	"github.com/Unknwon/i18n"
+	"github.com/stretchr/testify/assert"
+)
+
+func testCreateBranch(t *testing.T, session *TestSession, user, repo, oldRefName, newBranchName string, expectedStatus int) string {
+	var csrf string
+	if expectedStatus == http.StatusNotFound {
+		csrf = GetCSRF(t, session, path.Join(user, repo, "src/master"))
+	} else {
+		csrf = GetCSRF(t, session, path.Join(user, repo, "src", oldRefName))
+	}
+	req := NewRequestWithValues(t, "POST", path.Join(user, repo, "branches/_new", oldRefName), map[string]string{
+		"_csrf":           csrf,
+		"new_branch_name": newBranchName,
+	})
+	resp := session.MakeRequest(t, req, expectedStatus)
+	if expectedStatus != http.StatusFound {
+		return ""
+	}
+	return RedirectURL(t, resp)
+}
+
+func TestCreateBranch(t *testing.T) {
+	tests := []struct {
+		OldBranchOrCommit string
+		NewBranch         string
+		CreateRelease     string
+		FlashMessage      string
+		ExpectedStatus    int
+	}{
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "feature/test1",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.create_success", "feature/test1"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "form.NewBranchName") + i18n.Tr("en", "form.require_error"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "feature=test1",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "form.NewBranchName") + i18n.Tr("en", "form.git_ref_name_error"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         strings.Repeat("b", 101),
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "form.NewBranchName") + i18n.Tr("en", "form.max_size_error", "100"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "master",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.branch_already_exists", "master"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "master/test",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.branch_name_conflict", "master/test", "master"),
+		},
+		{
+			OldBranchOrCommit: "acd1d892867872cb47f3993468605b8aa59aa2e0",
+			NewBranch:         "feature/test2",
+			ExpectedStatus:    http.StatusNotFound,
+		},
+		{
+			OldBranchOrCommit: "65f1bf27bc3bf70f64657658635e66094edbcb4d",
+			NewBranch:         "feature/test3",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.create_success", "feature/test3"),
+		},
+		{
+			OldBranchOrCommit: "master",
+			NewBranch:         "v1.0.0",
+			CreateRelease:     "v1.0.0",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.tag_collision", "v1.0.0"),
+		},
+		{
+			OldBranchOrCommit: "v1.0.0",
+			NewBranch:         "feature/test4",
+			CreateRelease:     "v1.0.0",
+			ExpectedStatus:    http.StatusFound,
+			FlashMessage:      i18n.Tr("en", "repo.branch.create_success", "feature/test4"),
+		},
+	}
+	for _, test := range tests {
+		prepareTestEnv(t)
+		session := loginUser(t, "user2")
+		if test.CreateRelease != "" {
+			createNewRelease(t, session, "/user2/repo1", test.CreateRelease, test.CreateRelease, false, false)
+		}
+		redirectURL := testCreateBranch(t, session, "user2", "repo1", test.OldBranchOrCommit, test.NewBranch, test.ExpectedStatus)
+		if test.ExpectedStatus == http.StatusFound {
+			req := NewRequest(t, "GET", redirectURL)
+			resp := session.MakeRequest(t, req, http.StatusOK)
+			htmlDoc := NewHTMLParser(t, resp.Body)
+			assert.Equal(t,
+				test.FlashMessage,
+				strings.TrimSpace(htmlDoc.doc.Find(".ui.message").Text()),
+			)
+		}
+	}
+}
+
+func TestCreateBranchInvalidCSRF(t *testing.T) {
+	prepareTestEnv(t)
+	session := loginUser(t, "user2")
+	req := NewRequestWithValues(t, "POST", "user2/repo1/branches/_new/master", map[string]string{
+		"_csrf":           "fake_csrf",
+		"new_branch_name": "test",
+	})
+	session.MakeRequest(t, req, http.StatusBadRequest)
+}

models/error.go

@@ -649,6 +649,51 @@ func (err ErrBranchNotExist) Error() string {
 	return fmt.Sprintf("branch does not exist [name: %s]", err.Name)
 }
 
+// ErrBranchAlreadyExists represents an error that branch with such name already exists
+type ErrBranchAlreadyExists struct {
+	BranchName string
+}
+
+// IsErrBranchAlreadyExists checks if an error is an ErrBranchAlreadyExists.
+func IsErrBranchAlreadyExists(err error) bool {
+	_, ok := err.(ErrBranchAlreadyExists)
+	return ok
+}
+
+func (err ErrBranchAlreadyExists) Error() string {
+	return fmt.Sprintf("branch already exists [name: %s]", err.BranchName)
+}
+
+// ErrBranchNameConflict represents an error that branch name conflicts with other branch
+type ErrBranchNameConflict struct {
+	BranchName string
+}
+
+// IsErrBranchNameConflict checks if an error is an ErrBranchNameConflict.
+func IsErrBranchNameConflict(err error) bool {
+	_, ok := err.(ErrBranchNameConflict)
+	return ok
+}
+
+func (err ErrBranchNameConflict) Error() string {
+	return fmt.Sprintf("branch conflicts with existing branch [name: %s]", err.BranchName)
+}
+
+// ErrTagAlreadyExists represents an error that tag with such name already exists
+type ErrTagAlreadyExists struct {
+	TagName string
+}
+
+// IsErrTagAlreadyExists checks if an error is an ErrTagAlreadyExists.
+func IsErrTagAlreadyExists(err error) bool {
+	_, ok := err.(ErrTagAlreadyExists)
+	return ok
+}
+
+func (err ErrTagAlreadyExists) Error() string {
+	return fmt.Sprintf("tag already exists [name: %s]", err.TagName)
+}
+
 //  __      __      ___.   .__                   __
 // /  \    /  \ ____\_ |__ |  |__   ____   ____ |  | __
 // \   \/\/   // __ \| __ \|  |  \ /  _ \ /  _ \|  |/ /

models/repo.go

@@ -2426,38 +2426,3 @@ func (repo *Repository) GetUserFork(userID int64) (*Repository, error) {
 	}
 	return &forkedRepo, nil
 }
-
-// __________                             .__
-// \______   \____________    ____   ____ |  |__
-//  |    |  _/\_  __ \__  \  /    \_/ ___\|  |  \
-//  |    |   \ |  | \// __ \|   |  \  \___|   Y  \
-//  |______  / |__|  (____  /___|  /\___  >___|  /
-//         \/             \/     \/     \/     \/
-//
-
-// CreateNewBranch creates a new repository branch
-func (repo *Repository) CreateNewBranch(doer *User, oldBranchName, branchName string) (err error) {
-	repoWorkingPool.CheckIn(com.ToStr(repo.ID))
-	defer repoWorkingPool.CheckOut(com.ToStr(repo.ID))
-
-	localPath := repo.LocalCopyPath()
-
-	if err = discardLocalRepoBranchChanges(localPath, oldBranchName); err != nil {
-		return fmt.Errorf("discardLocalRepoChanges: %v", err)
-	} else if err = repo.UpdateLocalCopyBranch(oldBranchName); err != nil {
-		return fmt.Errorf("UpdateLocalCopyBranch: %v", err)
-	}
-
-	if err = repo.CheckoutNewBranch(oldBranchName, branchName); err != nil {
-		return fmt.Errorf("CreateNewBranch: %v", err)
-	}
-
-	if err = git.Push(localPath, git.PushOptions{
-		Remote: "origin",
-		Branch: branchName,
-	}); err != nil {
-		return fmt.Errorf("Push: %v", err)
-	}
-
-	return nil
-}

models/repo_branch.go

@@ -5,7 +5,13 @@
 package models
 
 import (
+	"fmt"
+	"time"
+
 	"code.gitea.io/git"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/Unknwon/com"
 )
 
 // Branch holds the branch information
@@ -36,6 +42,11 @@ func GetBranchesByPath(path string) ([]*Branch, error) {
 	return branches, nil
 }
 
+// CanCreateBranch returns true if repository meets the requirements for creating new branches.
+func (repo *Repository) CanCreateBranch() bool {
+	return !repo.IsMirror
+}
+
 // GetBranch returns a branch by it's name
 func (repo *Repository) GetBranch(branch string) (*Branch, error) {
 	if !git.IsBranchExist(repo.RepoPath(), branch) {
@@ -52,6 +63,128 @@ func (repo *Repository) GetBranches() ([]*Branch, error) {
 	return GetBranchesByPath(repo.RepoPath())
 }
 
+// CheckBranchName validates branch name with existing repository branches
+func (repo *Repository) CheckBranchName(name string) error {
+	gitRepo, err := git.OpenRepository(repo.RepoPath())
+	if err != nil {
+		return err
+	}
+
+	if _, err := gitRepo.GetTag(name); err == nil {
+		return ErrTagAlreadyExists{name}
+	}
+
+	branches, err := repo.GetBranches()
+	if err != nil {
+		return err
+	}
+
+	for _, branch := range branches {
+		if branch.Name == name {
+			return ErrBranchAlreadyExists{branch.Name}
+		} else if (len(branch.Name) < len(name) && branch.Name+"/" == name[0:len(branch.Name)+1]) ||
+			(len(branch.Name) > len(name) && name+"/" == branch.Name[0:len(name)+1]) {
+			return ErrBranchNameConflict{branch.Name}
+		}
+	}
+	return nil
+}
+
+// CreateNewBranch creates a new repository branch
+func (repo *Repository) CreateNewBranch(doer *User, oldBranchName, branchName string) (err error) {
+	repoWorkingPool.CheckIn(com.ToStr(repo.ID))
+	defer repoWorkingPool.CheckOut(com.ToStr(repo.ID))
+
+	// Check if branch name can be used
+	if err := repo.CheckBranchName(branchName); err != nil {
+		return err
+	}
+
+	localPath := repo.LocalCopyPath()
+
+	if err = discardLocalRepoBranchChanges(localPath, oldBranchName); err != nil {
+		return fmt.Errorf("discardLocalRepoChanges: %v", err)
+	} else if err = repo.UpdateLocalCopyBranch(oldBranchName); err != nil {
+		return fmt.Errorf("UpdateLocalCopyBranch: %v", err)
+	}
+
+	if err = repo.CheckoutNewBranch(oldBranchName, branchName); err != nil {
+		return fmt.Errorf("CreateNewBranch: %v", err)
+	}
+
+	if err = git.Push(localPath, git.PushOptions{
+		Remote: "origin",
+		Branch: branchName,
+	}); err != nil {
+		return fmt.Errorf("Push: %v", err)
+	}
+
+	return nil
+}
+
+// updateLocalCopyToCommit pulls latest changes of given commit from repoPath to localPath.
+// It creates a new clone if local copy does not exist.
+// This function checks out target commit by default, it is safe to assume subsequent
+// operations are operating against target commit when caller has confidence for no race condition.
+func updateLocalCopyToCommit(repoPath, localPath, commit string) error {
+	if !com.IsExist(localPath) {
+		if err := git.Clone(repoPath, localPath, git.CloneRepoOptions{
+			Timeout: time.Duration(setting.Git.Timeout.Clone) * time.Second,
+		}); err != nil {
+			return fmt.Errorf("git clone: %v", err)
+		}
+	} else {
+		_, err := git.NewCommand("fetch", "origin").RunInDir(localPath)
+		if err != nil {
+			return fmt.Errorf("git fetch origin: %v", err)
+		}
+		if err := git.ResetHEAD(localPath, true, "HEAD"); err != nil {
+			return fmt.Errorf("git reset --hard HEAD: %v", err)
+		}
+	}
+	if err := git.Checkout(localPath, git.CheckoutOptions{
+		Branch: commit,
+	}); err != nil {
+		return fmt.Errorf("git checkout %s: %v", commit, err)
+	}
+	return nil
+}
+
+// updateLocalCopyToCommit makes sure local copy of repository is at given commit.
+func (repo *Repository) updateLocalCopyToCommit(commit string) error {
+	return updateLocalCopyToCommit(repo.RepoPath(), repo.LocalCopyPath(), commit)
+}
+
+// CreateNewBranchFromCommit creates a new repository branch
+func (repo *Repository) CreateNewBranchFromCommit(doer *User, commit, branchName string) (err error) {
+	repoWorkingPool.CheckIn(com.ToStr(repo.ID))
+	defer repoWorkingPool.CheckOut(com.ToStr(repo.ID))
+
+	// Check if branch name can be used
+	if err := repo.CheckBranchName(branchName); err != nil {
+		return err
+	}
+
+	localPath := repo.LocalCopyPath()
+
+	if err = repo.updateLocalCopyToCommit(commit); err != nil {
+		return fmt.Errorf("UpdateLocalCopyBranch: %v", err)
+	}
+
+	if err = repo.CheckoutNewBranch(commit, branchName); err != nil {
+		return fmt.Errorf("CheckoutNewBranch: %v", err)
+	}
+
+	if err = git.Push(localPath, git.PushOptions{
+		Remote: "origin",
+		Branch: branchName,
+	}); err != nil {
+		return fmt.Errorf("Push: %v", err)
+	}
+
+	return nil
+}
+
 // GetCommit returns all the commits of a branch
 func (branch *Branch) GetCommit() (*git.Commit, error) {
 	gitRepo, err := git.OpenRepository(branch.Path)

modules/auth/repo_branch_form.go

@@ -0,0 +1,20 @@
+// Copyright 2017 The Gitea 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 auth
+
+import (
+	"github.com/go-macaron/binding"
+	macaron "gopkg.in/macaron.v1"
+)
+
+// NewBranchForm form for creating a new branch
+type NewBranchForm struct {
+	NewBranchName string `binding:"Required;MaxSize(100);GitRefName"`
+}
+
+// Validate validates the fields
+func (f *NewBranchForm) Validate(ctx *macaron.Context, errs binding.Errors) binding.Errors {
+	return validate(errs, ctx.Data, f, ctx.Locale)
+}

modules/context/repo.go

@@ -76,6 +76,11 @@ func (r *Repository) CanEnableEditor() bool {
 	return r.Repository.CanEnableEditor() && r.IsViewBranch && r.IsWriter()
 }
 
+// CanCreateBranch returns true if repository is editable and user has proper access level.
+func (r *Repository) CanCreateBranch() bool {
+	return r.Repository.CanCreateBranch() && r.IsWriter()
+}
+
 // CanCommitToBranch returns true if repository is editable and user has proper access level
 //   and branch is not protected
 func (r *Repository) CanCommitToBranch(doer *models.User) (bool, error) {
@@ -528,6 +533,7 @@ func RepoRef() macaron.Handler {
 		ctx.Data["IsViewBranch"] = ctx.Repo.IsViewBranch
 		ctx.Data["IsViewTag"] = ctx.Repo.IsViewTag
 		ctx.Data["IsViewCommit"] = ctx.Repo.IsViewCommit
+		ctx.Data["CanCreateBranch"] = ctx.Repo.CanCreateBranch()
 
 		ctx.Repo.CommitsCount, err = ctx.Repo.Commit.CommitsCount()
 		if err != nil {

modules/validation/binding.go

@@ -44,12 +44,18 @@ func addGitRefNameBindingRule() {
 			}
 			// Additional rules as described at https://www.kernel.org/pub/software/scm/git/docs/git-check-ref-format.html
 			if strings.HasPrefix(str, "/") || strings.HasSuffix(str, "/") ||
-				strings.HasPrefix(str, ".") || strings.HasSuffix(str, ".") ||
-				strings.HasSuffix(str, ".lock") ||
-				strings.Contains(str, "..") || strings.Contains(str, "//") {
+				strings.HasSuffix(str, ".") || strings.Contains(str, "..") ||
+				strings.Contains(str, "//") {
 				errs.Add([]string{name}, ErrGitRefName, "GitRefName")
 				return false, errs
 			}
+			parts := strings.Split(str, "/")
+			for _, part := range parts {
+				if strings.HasSuffix(part, ".lock") || strings.HasPrefix(part, ".") {
+					errs.Add([]string{name}, ErrGitRefName, "GitRefName")
+					return false, errs
+				}
+			}
 
 			return true, errs
 		},

options/locale/locale_en-US.ini

@@ -1061,6 +1061,12 @@ branch.delete_notices_2 = - This operation will permanently delete everything in
 branch.deletion_success = %s has been deleted.
 branch.deletion_failed = Failed to delete branch %s.
 branch.delete_branch_has_new_commits = %s cannot be deleted because new commits have been added after merging.
+branch.create_branch = Create branch <strong>%s</strong>
+branch.create_from = from '%s'
+branch.create_success = Branch '%s' has been created successfully!
+branch.branch_already_exists = Branch '%s' already exists in this repository.
+branch.branch_name_conflict = Branch name '%s' conflicts with already existing branch '%s'.
+branch.tag_collision = Branch '%s' can not be created as tag with same name already exists in this repository.
 
 [org]
 org_name_holder = Organization Name

public/js/index.js

@@ -362,9 +362,11 @@ function initRepository() {
         var $dropdown = $(selector);
         $dropdown.dropdown({
             fullTextSearch: true,
+            selectOnKeydown: false,
             onChange: function (text, value, $choice) {
+                if ($choice.data('url')) {
                     window.location.href = $choice.data('url');
-                console.log($choice.data('url'))
+                }
             },
             message: {noResults: $dropdown.data('no-results')}
         });
@@ -373,15 +375,7 @@ function initRepository() {
     // File list and commits
     if ($('.repository.file.list').length > 0 ||
         ('.repository.commits').length > 0) {
-        initFilterSearchDropdown('.choose.reference .dropdown');
-
-        $('.reference.column').click(function () {
-            $('.choose.reference .scrolling.menu').css('display', 'none');
-            $('.choose.reference .text').removeClass('black');
-            $($(this).data('target')).css('display', 'block');
-            $(this).find('.text').addClass('black');
-            return false;
-        });
+        initFilterBranchTagDropdown('.choose.reference .dropdown');
     }
 
     // Wiki
@@ -1318,7 +1312,7 @@ $(document).ready(function () {
     });
 
     // Semantic UI modules.
-    $('.dropdown').dropdown();
+    $('.dropdown:not(.custom)').dropdown();
     $('.jump.dropdown').dropdown({
         action: 'hide',
         onShow: function () {
@@ -1780,3 +1774,190 @@ function toggleStopwatch() {
 function cancelStopwatch() {
     $("#cancel_stopwatch_form").submit();
 }
+
+function initFilterBranchTagDropdown(selector) {
+    $(selector).each(function() {
+        var $dropdown = $(this);
+        var $data = $dropdown.find('.data');
+        var data = {
+            items: [],
+            mode: $data.data('mode'),
+            searchTerm: '',
+            noResults: '',
+            canCreateBranch: false,
+            menuVisible: false,
+            active: 0
+        };
+        $data.find('.item').each(function() {
+            data.items.push({
+                name: $(this).text(),
+                url: $(this).data('url'),
+                branch: $(this).hasClass('branch'),
+                tag: $(this).hasClass('tag'),
+                selected: $(this).hasClass('selected')
+            });
+        });
+        $data.remove();
+        new Vue({
+            delimiters: ['${', '}'],
+            el: this,
+            data: data,
+
+            beforeMount: function () {
+                var vm = this;
+
+                this.noResults = vm.$el.getAttribute('data-no-results');
+                this.canCreateBranch = vm.$el.getAttribute('data-can-create-branch') === 'true';
+
+                document.body.addEventListener('click', function(event) {
+                    if (vm.$el.contains(event.target)) {
+                        return;
+                    }
+                    if (vm.menuVisible) {
+                        Vue.set(vm, 'menuVisible', false);
+                    }
+                });
+            },
+
+            watch: {
+                menuVisible: function(visible) {
+                    if (visible) {
+                        this.focusSearchField();
+                    }
+                }
+            },
+
+            computed: {
+                filteredItems: function() {
+                    var vm = this;
+
+                    var items = vm.items.filter(function (item) {
+                        return ((vm.mode === 'branches' && item.branch)
+                                || (vm.mode === 'tags' && item.tag))
+                            && (!vm.searchTerm
+                                || item.name.toLowerCase().indexOf(vm.searchTerm.toLowerCase()) >= 0);
+                    });
+
+                    vm.active = (items.length === 0 && vm.showCreateNewBranch ? 0 : -1);
+
+                    return items;
+                },
+                showNoResults: function() {
+                    return this.filteredItems.length === 0
+                            && !this.showCreateNewBranch;
+                },
+                showCreateNewBranch: function() {
+                    var vm = this;
+                    if (!this.canCreateBranch || !vm.searchTerm || vm.mode === 'tags') {
+                        return false;
+                    }
+
+                    return vm.items.filter(function (item) {
+                        return item.name.toLowerCase() === vm.searchTerm.toLowerCase()
+                    }).length === 0;
+                }
+            },
+
+            methods: {
+                selectItem: function(item) {
+                    var prev = this.getSelected();
+                    if (prev !== null) {
+                        prev.selected = false;
+                    }
+                    item.selected = true;
+                    window.location.href = item.url;
+                },
+                createNewBranch: function() {
+                    if (!this.showCreateNewBranch) {
+                        return;
+                    }
+                    this.$refs.newBranchForm.submit();
+                },
+                focusSearchField: function() {
+                    var vm = this;
+                    Vue.nextTick(function() {
+                        vm.$refs.searchField.focus();
+                    });
+                },
+                getSelected: function() {
+                    for (var i = 0, j = this.items.length; i < j; ++i) {
+                        if (this.items[i].selected)
+                            return this.items[i];
+                    }
+                    return null;
+                },
+                getSelectedIndexInFiltered() {
+                    for (var i = 0, j = this.filteredItems.length; i < j; ++i) {
+                        if (this.filteredItems[i].selected)
+                            return i;
+                    }
+                    return -1;
+                },
+                scrollToActive() {
+                    var el = this.$refs['listItem' + this.active];
+                    if (!el || el.length === 0) {
+                        return;
+                    }
+                    if (Array.isArray(el)) {
+                        el = el[0];
+                    }
+
+                    var cont = this.$refs.scrollContainer;
+
+                     if (el.offsetTop < cont.scrollTop) {
+                         cont.scrollTop = el.offsetTop;
+                     }
+                     else if (el.offsetTop + el.clientHeight > cont.scrollTop + cont.clientHeight) {
+                        cont.scrollTop = el.offsetTop + el.clientHeight - cont.clientHeight;
+                    }
+                },
+                keydown: function(event) {
+                    var vm = this;
+                    if (event.keyCode === 40) {
+                        // arrow down
+                        event.preventDefault();
+
+                        if (vm.active === -1) {
+                            vm.active = vm.getSelectedIndexInFiltered();
+                        }
+
+                        if (vm.active + (vm.showCreateNewBranch ? 0 : 1) >= vm.filteredItems.length) {
+                            return;
+                        }
+                        vm.active++;
+                        vm.scrollToActive();
+                    }
+                    if (event.keyCode === 38) {
+                        // arrow up
+                        event.preventDefault();
+
+                         if (vm.active === -1) {
+                            vm.active = vm.getSelectedIndexInFiltered();
+                        }
+
+                         if (vm.active <= 0) {
+                            return;
+                        }
+                        vm.active--;
+                        vm.scrollToActive();
+                    }
+                    if (event.keyCode == 13) {
+                        // enter
+                        event.preventDefault();
+
+                         if (vm.active >= vm.filteredItems.length) {
+                            vm.createNewBranch();
+                        } else if (vm.active >= 0) {
+                            vm.selectItem(vm.filteredItems[vm.active]);
+                        }
+                    }
+                    if (event.keyCode == 27) {
+                        // escape
+                        event.preventDefault();
+                        vm.menuVisible = false;
+                    }
+                }
+            }
+        });
+    });
+}

public/less/_base.less

@@ -329,6 +329,10 @@ pre, code {
 			background-color: #a1882b !important;
 		}
 	}
+
+	.branch-tag-choice {
+		line-height: 20px;
+	}
 }
 
 

routers/repo/branch.go

@@ -5,6 +5,8 @@
 package repo
 
 import (
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
 )
@@ -30,3 +32,50 @@ func Branches(ctx *context.Context) {
 	ctx.Data["Branches"] = brs
 	ctx.HTML(200, tplBranch)
 }
+
+// CreateBranch creates new branch in repository
+func CreateBranch(ctx *context.Context, form auth.NewBranchForm) {
+	if !ctx.Repo.CanCreateBranch() {
+		ctx.Handle(404, "CreateBranch", nil)
+		return
+	}
+
+	if ctx.HasError() {
+		ctx.Flash.Error(ctx.GetErrMsg())
+		ctx.Redirect(ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchName)
+		return
+	}
+
+	var err error
+	if ctx.Repo.IsViewBranch {
+		err = ctx.Repo.Repository.CreateNewBranch(ctx.User, ctx.Repo.BranchName, form.NewBranchName)
+	} else {
+		err = ctx.Repo.Repository.CreateNewBranchFromCommit(ctx.User, ctx.Repo.BranchName, form.NewBranchName)
+	}
+	if err != nil {
+		if models.IsErrTagAlreadyExists(err) {
+			e := err.(models.ErrTagAlreadyExists)
+			ctx.Flash.Error(ctx.Tr("repo.branch.tag_collision", e.TagName))
+			ctx.Redirect(ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchName)
+			return
+		}
+		if models.IsErrBranchAlreadyExists(err) {
+			e := err.(models.ErrBranchAlreadyExists)
+			ctx.Flash.Error(ctx.Tr("repo.branch.branch_already_exists", e.BranchName))
+			ctx.Redirect(ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchName)
+			return
+		}
+		if models.IsErrBranchNameConflict(err) {
+			e := err.(models.ErrBranchNameConflict)
+			ctx.Flash.Error(ctx.Tr("repo.branch.branch_name_conflict", form.NewBranchName, e.BranchName))
+			ctx.Redirect(ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchName)
+			return
+		}
+
+		ctx.Handle(500, "CreateNewBranch", err)
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr("repo.branch.create_success", form.NewBranchName))
+	ctx.Redirect(ctx.Repo.RepoLink + "/src/" + form.NewBranchName)
+}

routers/routes/routes.go

@@ -554,6 +554,10 @@ func RegisterRoutes(m *macaron.Macaron) {
 				return
 			}
 		})
+
+		m.Group("/branches", func() {
+			m.Post("/_new/*", context.RepoRef(), bindIgnErr(auth.NewBranchForm{}), repo.CreateBranch)
+		}, reqRepoWriter, repo.MustBeNotBare)
 	}, reqSignIn, context.RepoAssignment(), context.UnitTypes(), context.LoadRepoUnits())
 
 	// Releases

templates/repo/branch_dropdown.tmpl

@@ -1,6 +1,6 @@
 <div class="fitted item choose reference">
-	<div class="ui floating filter dropdown" data-no-results="{{.i18n.Tr "repo.pulls.no_results"}}">
-			<div class="ui basic compact tiny button">
+	<div class="ui floating filter dropdown custom" data-can-create-branch="{{.CanCreateBranch}}" data-no-results="{{.i18n.Tr "repo.pulls.no_results"}}">
+		<div class="ui basic small button" @click="menuVisible = !menuVisible" @keyup.enter="menuVisible = !menuVisible">
 			<span class="text">
 				<i class="octicon octicon-git-branch"></i>
 				{{if .IsViewBranch}}{{.i18n.Tr "repo.branch"}}{{else}}{{.i18n.Tr "repo.tree"}}{{end}}:
@@ -8,37 +8,58 @@
 			</span>
 			<i class="dropdown icon"></i>
 		</div>
-		<div class="menu">
+		<div class="data" style="display: none" data-mode="{{if .IsViewTag}}tags{{else}}branches{{end}}">
+			{{range .Branches}}
+				<div class="item branch {{if eq $.BranchName .}}selected{{end}}" data-url="{{$.RepoLink}}/{{if $.PageIsCommits}}commits{{else}}src{{end}}/{{EscapePound .}}{{if $.TreePath}}/{{EscapePound $.TreePath}}{{end}}">{{.}}</div>
+			{{end}}
+			{{range .Tags}}
+				<div class="item tag {{if eq $.BranchName .}}selected{{end}}" data-url="{{$.RepoLink}}/{{if $.PageIsCommits}}commits{{else}}src{{end}}/{{EscapePound .}}{{if $.TreePath}}/{{EscapePound $.TreePath}}{{end}}">{{.}}</div>
+			{{end}}
+		</div>
+		<div class="menu transition visible" v-if="menuVisible" v-cloak>
 			<div class="ui icon search input">
 				<i class="filter icon"></i>
-				<input name="search" placeholder="{{.i18n.Tr "repo.filter_branch_and_tag"}}...">
+				<input name="search" ref="searchField" v-model="searchTerm" @keydown="keydown($event)" placeholder="{{.i18n.Tr "repo.filter_branch_and_tag"}}...">
 			</div>
-			<div class="header">
+			<div class="header branch-tag-choice">
 				<div class="ui grid">
 					<div class="two column row">
-						<a class="reference column" href="#" data-target="#branch-list">
-							<span class="text {{if not .IsViewTag}}black{{end}}">
+						<a class="reference column" href="#" @click="mode = 'branches'; focusSearchField()">
+							<span class="text" :class="{black: mode == 'branches'}">
 								<i class="octicon octicon-git-branch"></i> {{.i18n.Tr "repo.branches"}}
 							</span>
 						</a>
-						<a class="reference column" href="#" data-target="#tag-list">
-							<span class="text {{if .IsViewTag}}black{{end}}">
+						<a class="reference column" href="#" @click="mode = 'tags'; focusSearchField()">
+							<span class="text" :class="{black: mode == 'tags'}">
 								<i class="reference tags icon"></i> {{.i18n.Tr "repo.tags"}}
 							</span>
 						</a>
 					</div>
 				</div>
 			</div>
-			<div id="branch-list" class="scrolling menu" {{if .IsViewTag}}style="display: none"{{end}}>
-				{{range .Branches}}
-					<div class="item {{if eq $.BranchName .}}selected{{end}}" data-url="{{$.RepoLink}}/{{if $.PageIsCommits}}commits{{else}}src{{end}}/{{EscapePound .}}{{if $.TreePath}}/{{EscapePound $.TreePath}}{{end}}">{{.}}</div>
-				{{end}}
+			<div class="scrolling menu" ref="scrollContainer">
+				<div v-for="(item, index) in filteredItems" :key="item.name" class="item" :class="{selected: item.selected, active: active == index}" @click="selectItem(item)" :ref="'listItem' + index">${ item.name }</div>
+				<div class="item" v-if="showCreateNewBranch" :class="{active: active == filteredItems.length}" :ref="'listItem' + filteredItems.length">
+					<a href="#" @click="createNewBranch()">
+						<div>
+							<i class="octicon octicon-git-branch"></i>
+							{{.i18n.Tr "repo.branch.create_branch" `${ searchTerm }` | Safe}}
 						</div>
-			<div id="tag-list" class="scrolling menu" {{if not .IsViewTag}}style="display: none"{{end}}>
-				{{range .Tags}}
-					<div class="item {{if eq $.BranchName .}}selected{{end}}" data-url="{{$.RepoLink}}/{{if $.PageIsCommits}}commits{{else}}src{{end}}/{{EscapePound .}}{{if $.TreePath}}/{{EscapePound $.TreePath}}{{end}}">{{.}}</div>
+						<div class="text small">
+							{{if .IsViewBranch}}
+								{{.i18n.Tr "repo.branch.create_from" .BranchName | Safe}}
+							{{else}}
+								{{.i18n.Tr "repo.branch.create_from" (ShortSha .BranchName) | Safe}}
 							{{end}}
 						</div>
+					</a>
+					<form ref="newBranchForm" action="{{.RepoLink}}/branches/_new/{{EscapePound .BranchName}}" method="post">
+						{{.CsrfTokenHtml}}
+						<input type="hidden" name="new_branch_name" v-model="searchTerm">
+					</form>
+				</div>
+			</div>
+			<div class="message" v-if="showNoResults">${ noResults }</div>
 		</div>
 	</div>
 </div>