Archived
Add switch branch (b): stage the tip and restore to it
b opens a centered popup with a search line and the local and remote branches of the selection. Enter stages the branch tip as the pin of a submodule, restores it (and everything below) to it, and puts HEAD on the branch; a remote branch gets a local tracking branch unless one exists elsewhere. Works on the superproject too. Losses are asked like restore. The backdrop behind the popup is dimmed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5.5
@@ -0,0 +1,132 @@
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package git
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import (
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"context"
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"errors"
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"fmt"
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"slices"
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"strconv"
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"strings"
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"time"
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"submarine/internal/submodule"
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)
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// switchDir returns the directory of path ("" is the superproject), and the
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// submodule's info if it is one.
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func (p *Provider) switchDir(path string) (dir string, in info, sub bool, err error) {
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if path == "" {
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return p.root, info{}, false, nil
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}
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p.mu.RLock()
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in, ok := p.mods[path]
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p.mu.RUnlock()
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if !ok {
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return "", info{}, false, fmt.Errorf("unknown submodule %q", path)
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}
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if !initialized(in.dir) {
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return "", info{}, false, errors.New("not initialized; restore it first")
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}
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return in.dir, in, true, nil
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}
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// Branches lists the local and remote-tracking branches of path, local ones
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// first, each group by the date of its tip, newest first. It reads only what
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// is on disk.
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func (p *Provider) Branches(ctx context.Context, path string) ([]submodule.Branch, error) {
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dir, _, _, err := p.switchDir(path)
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if err != nil {
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return nil, err
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}
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out, err := run(ctx, dir, "for-each-ref",
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"--format=%(refname)%00%(objectname)%00%(committerdate:unix)%00%(HEAD)%00%(symref)",
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"refs/heads", "refs/remotes")
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if err != nil {
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return nil, err
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}
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var branches []submodule.Branch
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for _, line := range strings.Split(out, "\n") {
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f := strings.Split(line, "\x00")
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if len(f) != 5 || f[4] != "" { // a symref is origin/HEAD
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continue
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}
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b := submodule.Branch{Ref: f[0], SHA: f[1], Current: f[3] == "*"}
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if secs, err := strconv.ParseInt(f[2], 10, 64); err == nil {
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b.When = time.Unix(secs, 0)
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}
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if name, ok := strings.CutPrefix(f[0], "refs/heads/"); ok {
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b.Name, b.Local = name, name
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} else if name, ok := strings.CutPrefix(f[0], "refs/remotes/"); ok {
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_, local, _ := strings.Cut(name, "/")
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b.Name, b.Local, b.Remote = name, local, true
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} else {
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continue
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}
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branches = append(branches, b)
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}
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slices.SortStableFunc(branches, func(a, b submodule.Branch) int {
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switch {
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case a.Remote != b.Remote:
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if a.Remote {
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return 1
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}
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return -1
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default:
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return b.When.Compare(a.When)
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}
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})
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return branches, nil
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}
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// SwitchLoss reports what switching path to b would discard: the same as a
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// restore to b's tip.
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func (p *Provider) SwitchLoss(ctx context.Context, path string, b submodule.Branch) (submodule.Loss, error) {
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dir, _, _, err := p.switchDir(path)
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if err != nil {
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return submodule.Loss{}, err
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}
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return p.lossOf(ctx, dir, b.SHA), nil
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}
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// Switch makes b's tip the staged pin of a submodule, restores the repository
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// to it (see Restore) and puts HEAD on the branch. For a remote branch the
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// local branch of that name is created, tracking it. A local branch that
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// exists elsewhere is never moved: HEAD stays detached and "" is returned.
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func (p *Provider) Switch(ctx context.Context, path string, b submodule.Branch) (string, error) {
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dir, in, sub, err := p.switchDir(path)
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if err != nil {
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return "", err
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}
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if sha, ok, err := try(ctx, dir, "rev-parse", "--verify", "-q", b.Ref+"^{commit}"); err != nil {
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return "", err
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} else if !ok || sha != b.SHA {
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return "", fmt.Errorf("%s moved; open the list again", b.Name)
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}
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if sub { // staged first, so a failed restore can be repeated with x
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if _, err := p.exec(ctx, in.superDir, nil, "update-index", "--cacheinfo", "160000,"+b.SHA+","+in.relPath); err != nil {
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return "", err
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}
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}
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if err := p.restoreRepo(ctx, dir, b.SHA); err != nil {
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return "", err
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}
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g := func(args ...string) (string, error) {
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return p.exec(ctx, dir, nil, append(append([]string{}, restoreArgs...), args...)...)
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}
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if !b.Remote {
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_, err := g("switch", "-q", b.Local)
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return b.Local, err
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}
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switch tip, ok, err := try(ctx, dir, "rev-parse", "--verify", "-q", "refs/heads/"+b.Local); {
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case err != nil:
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return "", err
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case !ok:
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_, err := g("switch", "-q", "-c", b.Local, "--track", b.Name)
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return b.Local, err
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case tip == b.SHA:
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_, err := g("switch", "-q", b.Local)
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return b.Local, err
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}
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return "", nil
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}
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@@ -0,0 +1,181 @@
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package git
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import (
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"context"
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"os"
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"path/filepath"
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"strings"
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"testing"
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"submarine/internal/submodule"
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)
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func findBranch(t *testing.T, bs []submodule.Branch, name string) submodule.Branch {
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t.Helper()
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for _, b := range bs {
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if b.Name == name {
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return b
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}
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}
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t.Fatalf("no branch %q in %v", name, bs)
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return submodule.Branch{}
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}
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func TestBranchesListsLocalAndRemote(t *testing.T) {
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p, root := ownFixture(t)
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_ = root
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bs, err := p.Branches(context.Background(), "libs/feature")
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if err != nil {
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t.Fatal(err)
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}
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var names []string
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seenRemote := false
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for _, b := range bs {
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names = append(names, b.Name)
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if b.Remote {
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seenRemote = true
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} else if seenRemote {
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t.Errorf("local branch %s after a remote one: %v", b.Name, names)
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}
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if b.Name == "origin/HEAD" {
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t.Error("origin/HEAD must not be listed")
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}
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}
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rb := findBranch(t, bs, "origin/feat/search")
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if !rb.Remote || rb.Local != "feat/search" {
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t.Errorf("origin/feat/search = %+v", rb)
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}
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findBranch(t, bs, "origin/main")
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}
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func TestSwitchSubmoduleStagesTipAndTracksRemoteBranch(t *testing.T) {
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p, root := ownFixture(t)
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super := filepath.Join(root, "super")
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sub := filepath.Join(super, "libs", "feature")
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ctx := context.Background()
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bs, err := p.Branches(ctx, "libs/feature")
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if err != nil {
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t.Fatal(err)
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}
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b := findBranch(t, bs, "origin/feat/search")
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got, err := p.Switch(ctx, "libs/feature", b)
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if err != nil {
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t.Fatal(err)
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}
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if got != "feat/search" {
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t.Errorf("Switch returned %q, want feat/search", got)
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}
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if head := out(t, sub, "branch", "--show-current"); head != "feat/search" {
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t.Errorf("branch = %q", head)
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}
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if up := out(t, sub, "rev-parse", "--abbrev-ref", "feat/search@{upstream}"); up != "origin/feat/search" {
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t.Errorf("upstream = %q", up)
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}
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if head := out(t, sub, "rev-parse", "HEAD"); head != b.SHA {
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t.Errorf("HEAD = %s, want %s", head, b.SHA)
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}
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if staged := out(t, super, "ls-files", "-s", "--", "libs/feature"); !strings.Contains(staged, b.SHA) {
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t.Errorf("index = %q, want the tip %s staged", staged, b.SHA)
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}
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assertExact(t, sub)
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}
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func TestSwitchNeverMovesAnExistingLocalBranch(t *testing.T) {
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p, root := ownFixture(t)
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sub := filepath.Join(root, "super", "libs", "feature")
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ctx := context.Background()
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git(t, sub, "branch", "feat/search", "origin/main") // same name, elsewhere
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before := out(t, sub, "rev-parse", "feat/search")
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bs, err := p.Branches(ctx, "libs/feature")
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if err != nil {
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t.Fatal(err)
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}
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b := findBranch(t, bs, "origin/feat/search")
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got, err := p.Switch(ctx, "libs/feature", b)
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if err != nil {
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t.Fatal(err)
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}
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if got != "" {
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t.Errorf("Switch returned %q, want detached", got)
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}
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if head := out(t, sub, "branch", "--show-current"); head != "" {
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t.Errorf("HEAD on %q, want detached", head)
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}
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if after := out(t, sub, "rev-parse", "feat/search"); after != before {
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t.Errorf("branch moved: %s -> %s", before, after)
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}
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if head := out(t, sub, "rev-parse", "HEAD"); head != b.SHA {
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t.Errorf("HEAD = %s, want %s", head, b.SHA)
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}
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}
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func TestSwitchAbortsWhenTheBranchMoved(t *testing.T) {
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p, root := ownFixture(t)
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sub := filepath.Join(root, "super", "libs", "feature")
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ctx := context.Background()
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bs, err := p.Branches(ctx, "libs/feature")
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if err != nil {
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t.Fatal(err)
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}
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b := findBranch(t, bs, "origin/main")
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b.SHA = out(t, sub, "rev-parse", "origin/feat/search") // what the list showed is stale
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if _, err := p.Switch(ctx, "libs/feature", b); err == nil || !strings.Contains(err.Error(), "moved") {
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t.Errorf("err = %v, want a moved error", err)
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}
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}
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func TestSwitchSuperprojectRestoresSubmodulesToItsPins(t *testing.T) {
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p, root := ownFixture(t)
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super := filepath.Join(root, "super")
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ctx := context.Background()
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git(t, super, "branch", "older", "HEAD~1")
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bs, err := p.Branches(ctx, "")
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if err != nil {
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t.Fatal(err)
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}
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b := findBranch(t, bs, "older")
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got, err := p.Switch(ctx, "", b)
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if err != nil {
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t.Fatal(err)
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}
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if got != "older" || out(t, super, "branch", "--show-current") != "older" {
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t.Errorf("Switch = %q, branch = %q", got, out(t, super, "branch", "--show-current"))
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}
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assertExact(t, super)
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}
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func TestSwitchLossCountsChangedFiles(t *testing.T) {
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p, root := ownFixture(t)
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sub := filepath.Join(root, "super", "libs", "feature")
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ctx := context.Background()
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bs, err := p.Branches(ctx, "libs/feature")
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if err != nil {
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t.Fatal(err)
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}
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b := findBranch(t, bs, "origin/feat/search")
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loss, err := p.SwitchLoss(ctx, "libs/feature", b)
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if err != nil {
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t.Fatal(err)
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}
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if !loss.Empty() {
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t.Errorf("clean checkout: loss = %+v", loss)
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}
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if err := os.WriteFile(filepath.Join(sub, "new.txt"), []byte("x"), 0o644); err != nil {
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t.Fatal(err)
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}
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if loss, err = p.SwitchLoss(ctx, "libs/feature", b); err != nil || loss.Files != 1 {
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t.Errorf("loss = %+v, %v; want 1 file", loss, err)
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}
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}
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func TestBranchesOfAMissingSubmoduleSaysSo(t *testing.T) {
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p, _ := ownFixture(t)
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if _, err := p.Branches(context.Background(), "libs/missing"); err == nil || !strings.Contains(err.Error(), "not initialized") {
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t.Errorf("err = %v", err)
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}
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}
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