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// SPDX-FileCopyrightText: 2017 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: GPL-3.0-only
package prompt
import (
"fmt"
"os"
"path/filepath"
"strings"
)
type gitRepo struct {
RootPath string
GitDir string
}
// Returns two empty strings if `path` is not inside a Git repo.
func findRepo(path string) (*gitRepo, error) {
//find .git directory or file
gitEntry := filepath.Join(path, ".git")
fi, err := os.Stat(gitEntry)
switch {
case err == nil:
//found - continue below with further checks
case !os.IsNotExist(err):
return nil, err
case path == "/":
return nil, nil
default:
return findRepo(filepath.Dir(path))
}
//found .git - what is it?
if fi.Mode().IsDir() {
//normal case - .git is a directory
return &gitRepo{RootPath: path, GitDir: gitEntry}, nil
}
//.git is a file (e.g. for submodules) - it contains a line like "gitdir: path/to/gitdir"
bytes, err := os.ReadFile(gitEntry)
if err != nil {
return nil, err
}
for line := range strings.SplitSeq(string(bytes), "\n") {
line = strings.TrimSpace(line)
if gitDir, ok := strings.CutPrefix(line, "gitdir:"); ok {
return &gitRepo{
RootPath: path,
GitDir: filepath.Join(path, strings.TrimSpace(gitDir)),
}, nil
}
}
return nil, fmt.Errorf("read %s: missing gitdir directive", gitEntry)
}
func getRepoStatusField(repo *gitRepo) string {
if repo == nil {
return ""
}
bytes, err := os.ReadFile(filepath.Join(repo.GitDir, "HEAD"))
if err != nil {
handleError(err)
return withType("git", withColor("1;41", "unknown"))
}
refSpec := strings.TrimSpace(string(bytes))
//is current HEAD detached?
if !strings.HasPrefix(refSpec, "ref: refs/") {
return formatRepoStatusField(withColor("1;41", "detached"), refSpec)
}
//current HEAD is a ref
refSpec = strings.TrimPrefix(refSpec, "ref: ")
refSpecDisplay := strings.TrimPrefix(refSpec, "refs/")
refSpecDisplay = strings.TrimPrefix(refSpecDisplay, "heads/")
//read file corresponding to refspec to find commit ID
bytes, err = os.ReadFile(filepath.Join(repo.GitDir, refSpec))
commitID := strings.TrimSpace(string(bytes))
if err != nil {
if os.IsNotExist(err) {
commitID = tryReadFromPackedRefs(repo, refSpec)
if commitID == "" {
commitID = withColor("37", "blank")
}
} else {
handleError(err)
commitID = withColor("1;41", "unknown")
}
}
return formatRepoStatusField(refSpecDisplay, commitID)
}
func tryReadFromPackedRefs(repo *gitRepo, refSpec string) string {
bytes, err := os.ReadFile(filepath.Join(repo.GitDir, "packed-refs"))
if err != nil {
return ""
}
for line := range strings.SplitSeq(string(bytes), "\n") {
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
continue
}
fields := strings.Fields(line)
if len(fields) == 2 && fields[1] == refSpec {
return fields[0]
}
}
return ""
}
func formatRepoStatusField(refSpec, commitID string) string {
//shorten plain commit IDs from 40 to 10 bytes
if len(commitID) == 40 && !strings.Contains(commitID, "\x1B") {
commitID = commitID[0:10]
}
return withType("git", refSpec+"/"+commitID)
}
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