1 files changed, 159 insertions, 0 deletions
diff --git a/modules/git/repo_branch.go b/modules/git/repo_branch.go
new file mode 100644
index 00000000..552ae2bb
--- /dev/null
+++ b/modules/git/repo_branch.go
@@ -0,0 +1,159 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+)
+
+// BranchPrefix base dir of the branch information file store on git
+const BranchPrefix = "refs/heads/"
+
+// IsReferenceExist returns true if given reference exists in the repository.
+func IsReferenceExist(ctx context.Context, repoPath, name string) bool {
+	_, _, err := NewCommand(ctx, "show-ref", "--verify").AddDashesAndList(name).RunStdString(&RunOpts{Dir: repoPath})
+	return err == nil
+}
+
+// IsBranchExist returns true if given branch exists in the repository.
+func IsBranchExist(ctx context.Context, repoPath, name string) bool {
+	return IsReferenceExist(ctx, repoPath, BranchPrefix+name)
+}
+
+// Branch represents a Git branch.
+type Branch struct {
+	Name string
+	Path string
+
+	gitRepo *Repository
+}
+
+// GetHEADBranch returns corresponding branch of HEAD.
+func (repo *Repository) GetHEADBranch() (*Branch, error) {
+	if repo == nil {
+		return nil, fmt.Errorf("nil repo")
+	}
+	stdout, _, err := NewCommand(repo.Ctx, "symbolic-ref", "HEAD").RunStdString(&RunOpts{Dir: repo.Path})
+	if err != nil {
+		return nil, err
+	}
+	stdout = strings.TrimSpace(stdout)
+
+	if !strings.HasPrefix(stdout, BranchPrefix) {
+		return nil, fmt.Errorf("invalid HEAD branch: %v", stdout)
+	}
+
+	return &Branch{
+		Name:    stdout[len(BranchPrefix):],
+		Path:    stdout,
+		gitRepo: repo,
+	}, nil
+}
+
+func GetDefaultBranch(ctx context.Context, repoPath string) (string, error) {
+	stdout, _, err := NewCommand(ctx, "symbolic-ref", "HEAD").RunStdString(&RunOpts{Dir: repoPath})
+	if err != nil {
+		return "", err
+	}
+	stdout = strings.TrimSpace(stdout)
+	if !strings.HasPrefix(stdout, BranchPrefix) {
+		return "", errors.New("the HEAD is not a branch: " + stdout)
+	}
+	return strings.TrimPrefix(stdout, BranchPrefix), nil
+}
+
+// GetBranch returns a branch by it's name
+func (repo *Repository) GetBranch(branch string) (*Branch, error) {
+	if !repo.IsBranchExist(branch) {
+		return nil, ErrBranchNotExist{branch}
+	}
+	return &Branch{
+		Path:    repo.Path,
+		Name:    branch,
+		gitRepo: repo,
+	}, nil
+}
+
+// GetBranches returns a slice of *git.Branch
+func (repo *Repository) GetBranches(skip, limit int) ([]*Branch, int, error) {
+	brs, countAll, err := repo.GetBranchNames(skip, limit)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	branches := make([]*Branch, len(brs))
+	for i := range brs {
+		branches[i] = &Branch{
+			Path:    repo.Path,
+			Name:    brs[i],
+			gitRepo: repo,
+		}
+	}
+
+	return branches, countAll, nil
+}
+
+// DeleteBranchOptions 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(repo.Ctx, "branch")
+
+	if opts.Force {
+		cmd.AddArguments("-D")
+	} else {
+		cmd.AddArguments("-d")
+	}
+
+	cmd.AddDashesAndList(name)
+	_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
+
+	return err
+}
+
+// CreateBranch create a new branch
+func (repo *Repository) CreateBranch(branch, oldbranchOrCommit string) error {
+	cmd := NewCommand(repo.Ctx, "branch")
+	cmd.AddDashesAndList(branch, oldbranchOrCommit)
+
+	_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
+
+	return err
+}
+
+// AddRemote adds a new remote to repository.
+func (repo *Repository) AddRemote(name, url string, fetch bool) error {
+	cmd := NewCommand(repo.Ctx, "remote", "add")
+	if fetch {
+		cmd.AddArguments("-f")
+	}
+	cmd.AddDynamicArguments(name, url)
+
+	_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
+	return err
+}
+
+// RemoveRemote removes a remote from repository.
+func (repo *Repository) RemoveRemote(name string) error {
+	_, _, err := NewCommand(repo.Ctx, "remote", "rm").AddDynamicArguments(name).RunStdString(&RunOpts{Dir: repo.Path})
+	return err
+}
+
+// GetCommit returns the head commit of a branch
+func (branch *Branch) GetCommit() (*Commit, error) {
+	return branch.gitRepo.GetBranchCommit(branch.Name)
+}
+
+// RenameBranch rename a branch
+func (repo *Repository) RenameBranch(from, to string) error {
+	_, _, err := NewCommand(repo.Ctx, "branch", "-m").AddDynamicArguments(from, to).RunStdString(&RunOpts{Dir: repo.Path})
+	return err
+}