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package git
import (
"bytes"
"errors"
"fmt"
"net/url"
"os"
"os/exec"
"regexp"
"strings"
"github.com/cli/cli/internal/run"
)
// Ref represents a git commit reference
type Ref struct {
Hash string
Name string
}
// TrackingRef represents a ref for a remote tracking branch
type TrackingRef struct {
RemoteName string
BranchName string
}
func (r TrackingRef) String() string {
return "refs/remotes/" + r.RemoteName + "/" + r.BranchName
}
// ShowRefs resolves fully-qualified refs to commit hashes
func ShowRefs(ref ...string) ([]Ref, error) {
args := append([]string{"show-ref", "--verify", "--"}, ref...)
showRef := exec.Command("git", args...)
output, err := run.PrepareCmd(showRef).Output()
var refs []Ref
for _, line := range outputLines(output) {
parts := strings.SplitN(line, " ", 2)
if len(parts) < 2 {
continue
}
refs = append(refs, Ref{
Hash: parts[0],
Name: parts[1],
})
}
return refs, err
}
// CurrentBranch reads the checked-out branch for the git repository
func CurrentBranch() (string, error) {
refCmd := GitCommand("symbolic-ref", "--quiet", "--short", "HEAD")
output, err := run.PrepareCmd(refCmd).Output()
if err == nil {
// Found the branch name
return firstLine(output), nil
}
var cmdErr *run.CmdError
if errors.As(err, &cmdErr) {
if cmdErr.Stderr.Len() == 0 {
// Detached head
return "", errors.New("git: not on any branch")
}
}
// Unknown error
return "", err
}
func listRemotes() ([]string, error) {
remoteCmd := exec.Command("git", "remote", "-v")
output, err := run.PrepareCmd(remoteCmd).Output()
return outputLines(output), err
}
func Config(name string) (string, error) {
configCmd := exec.Command("git", "config", name)
output, err := run.PrepareCmd(configCmd).Output()
if err != nil {
return "", fmt.Errorf("unknown config key: %s", name)
}
return firstLine(output), nil
}
var GitCommand = func(args ...string) *exec.Cmd {
return exec.Command("git", args...)
}
func UncommittedChangeCount() (int, error) {
statusCmd := GitCommand("status", "--porcelain")
output, err := run.PrepareCmd(statusCmd).Output()
if err != nil {
return 0, err
}
lines := strings.Split(string(output), "\n")
count := 0
for _, l := range lines {
if l != "" {
count++
}
}
return count, nil
}
type Commit struct {
Sha string
Title string
}
func Commits(baseRef, headRef string) ([]*Commit, error) {
logCmd := GitCommand(
"-c", "log.ShowSignature=false",
"log", "--pretty=format:%H,%s",
"--cherry", fmt.Sprintf("%s...%s", baseRef, headRef))
output, err := run.PrepareCmd(logCmd).Output()
if err != nil {
return []*Commit{}, err
}
commits := []*Commit{}
sha := 0
title := 1
for _, line := range outputLines(output) {
split := strings.SplitN(line, ",", 2)
if len(split) != 2 {
continue
}
commits = append(commits, &Commit{
Sha: split[sha],
Title: split[title],
})
}
if len(commits) == 0 {
return commits, fmt.Errorf("could not find any commits between %s and %s", baseRef, headRef)
}
return commits, nil
}
func CommitBody(sha string) (string, error) {
showCmd := GitCommand("-c", "log.ShowSignature=false", "show", "-s", "--pretty=format:%b", sha)
output, err := run.PrepareCmd(showCmd).Output()
if err != nil {
return "", err
}
return string(output), nil
}
// Push publishes a git ref to a remote and sets up upstream configuration
func Push(remote string, ref string) error {
pushCmd := GitCommand("push", "--set-upstream", remote, ref)
pushCmd.Stdout = os.Stdout
pushCmd.Stderr = os.Stderr
return run.PrepareCmd(pushCmd).Run()
}
type BranchConfig struct {
RemoteName string
RemoteURL *url.URL
MergeRef string
}
// ReadBranchConfig parses the `branch.BRANCH.(remote|merge)` part of git config
func ReadBranchConfig(branch string) (cfg BranchConfig) {
prefix := regexp.QuoteMeta(fmt.Sprintf("branch.%s.", branch))
configCmd := GitCommand("config", "--get-regexp", fmt.Sprintf("^%s(remote|merge)$", prefix))
output, err := run.PrepareCmd(configCmd).Output()
if err != nil {
return
}
for _, line := range outputLines(output) {
parts := strings.SplitN(line, " ", 2)
if len(parts) < 2 {
continue
}
keys := strings.Split(parts[0], ".")
switch keys[len(keys)-1] {
case "remote":
if strings.Contains(parts[1], ":") {
u, err := ParseURL(parts[1])
if err != nil {
continue
}
cfg.RemoteURL = u
} else if !isFilesystemPath(parts[1]) {
cfg.RemoteName = parts[1]
}
case "merge":
cfg.MergeRef = parts[1]
}
}
return
}
func isFilesystemPath(p string) bool {
return p == "." || strings.HasPrefix(p, "./") || strings.HasPrefix(p, "/")
}
// ToplevelDir returns the top-level directory path of the current repository
func ToplevelDir() (string, error) {
showCmd := exec.Command("git", "rev-parse", "--show-toplevel")
output, err := run.PrepareCmd(showCmd).Output()
return firstLine(output), err
}
func outputLines(output []byte) []string {
lines := strings.TrimSuffix(string(output), "\n")
return strings.Split(lines, "\n")
}
func firstLine(output []byte) string {
if i := bytes.IndexAny(output, "\n"); i >= 0 {
return string(output)[0:i]
}
return string(output)
}