fix: pr-closed-lookup (follow gh: find closed and merged pull requests by branch)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/checks.go

@@ -29,7 +29,7 @@ tea exits with 8 while checks are pending and with 1 when a check failed, like g
 		if interval <= 0 || timeout <= 0 {
 			return clierr.Wrap(clierr.Usage, errors.New("--interval and --timeout must be positive"))
 		}
-		t, n, err := a.pullSelector(cmd, args)
+		t, n, err := a.pullSelectorAny(cmd, args)
 		if err != nil {
 			return err
 		}

internal/app/pull_clean.go

@@ -20,7 +20,7 @@ import (
 func (a *application) pullCleanCommand() *cobra.Command {
 	var ignoreSHA bool
 	cmd := &cobra.Command{Use: "clean [<number> | <url> | <branch>]", Short: "Delete the branches of a merged or closed pull request", Annotations: pullArgumentsAnnotation(map[string]string{"tea.confirm": "true"}), Args: usageArgs(cobra.MaximumNArgs(1)), RunE: func(cmd *cobra.Command, args []string) error {
-		target, n, err := a.pullSelector(cmd, args)
+		target, n, err := a.pullSelectorAny(cmd, args)
 		if err != nil {
 			return err
 		}

internal/app/pull_closed_lookup_test.go

@@ -0,0 +1,133 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package app
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// closedLookupServer has one open pull request, for feat, and closed ones for gone, listed
+// newest first like sort=recentupdate.
+func closedLookupServer(t *testing.T, requests *[]string) string {
+	t.Helper()
+	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		*requests = append(*requests, r.Method+" "+r.URL.Path+"?state="+r.URL.Query().Get("state"))
+		if number, ok := strings.CutPrefix(r.URL.Path, "/api/v1/repos/alice/project/pulls/"); ok {
+			_, _ = fmt.Fprintf(w, `{"number":%s,"title":"Old","state":"closed","merged":true,"head":{"ref":"gone","sha":"abc","repo":{"full_name":"alice/project"}}}`, number)
+			return
+		}
+		if r.URL.Path == "/api/v1/repos/alice/project" {
+			_, _ = fmt.Fprint(w, `{"full_name":"alice/project","default_branch":"main"}`)
+			return
+		}
+		if r.URL.Path != "/api/v1/repos/alice/project/pulls" {
+			http.NotFound(w, r)
+			return
+		}
+		if r.URL.Query().Get("state") == "open" {
+			writeFirstPage(w, r, `[{"number":3,"head":{"ref":"feat","repo":{"full_name":"alice/project"}}}]`)
+			return
+		}
+		require.Equal(t, "closed", r.URL.Query().Get("state"))
+		require.Equal(t, "recentupdate", r.URL.Query().Get("sort"))
+		writeFirstPage(w, r, `[
+			{"number":40,"head":{"ref":"gone","repo":{"full_name":"bob/project"}}},
+			{"number":31,"head":{"ref":"gone","repo":{"full_name":"alice/project"}}},
+			{"number":30,"head":{"ref":"gone","repo":{"full_name":"alice/project"}}}
+		]`)
+	}))
+	t.Cleanup(server.Close)
+	return server.URL
+}
+
+func TestPullSelectorAnyFallsBackToTheNewestClosedPull(t *testing.T) {
+	var requests []string
+	serverURL := closedLookupServer(t, &requests)
+	for _, tc := range []struct {
+		name string
+		arg  string
+		want int64
+		err  string
+	}{
+		{"open one wins", "feat", 3, ""},
+		{"newest closed", "gone", 40, ""},
+		{"owner qualified", "alice:gone", 31, ""},
+		{"unknown", "nothing", 0, `no open pull request for branch "nothing"`},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			a, _ := refApplicationWith(t, serverURL, nil)
+			_, n, err := a.pullSelectorAny(commandContext(), []string{tc.arg})
+			if tc.err != "" {
+				require.ErrorContains(t, err, tc.err)
+				return
+			}
+			require.NoError(t, err)
+			require.Equal(t, tc.want, n)
+		})
+	}
+	// Commands that need an open pull request still do not see closed ones.
+	requests = nil
+	a, _ := refApplicationWith(t, serverURL, nil)
+	_, _, err := a.pullSelector(commandContext(), []string{"gone"})
+	require.ErrorContains(t, err, `no open pull request for branch "gone"`)
+	require.NotContains(t, strings.Join(requests, "\n"), "state=closed")
+}
+
+func TestPullSelectorAnyFallsBackForTheCheckedOutBranch(t *testing.T) {
+	var requests []string
+	serverURL := closedLookupServer(t, &requests)
+	a, _ := refApplicationWith(t, serverURL, map[string]string{"symbolic-ref --quiet HEAD": "gone"})
+	// The fork's newer pull request for a branch named like the local one is not this repository's.
+	_, n, err := a.pullSelectorAny(commandContext(), nil)
+	require.NoError(t, err)
+	require.Equal(t, int64(31), n)
+	_, _, err = a.pullSelector(commandContext(), nil)
+	require.ErrorContains(t, err, `no open pull request for branch "gone"`)
+}
+
+func TestPullCommandsFindClosedPullsByBranch(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		args []string
+		err  string
+	}{
+		{"view", []string{"pr", "view", "alice:gone", "--json=number"}, ""},
+		{"checks", []string{"pr", "checks", "alice:gone", "--web", "--no-input"}, ""},
+		{"reopen", []string{"pr", "reopen", "alice:gone"}, "already merged"},
+		{"clean", []string{"pr", "clean", "alice:gone", "--no-input"}, ""},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			var requests []string
+			serverURL := closedLookupServer(t, &requests)
+			deps, _, _ := serverDeps(t, serverURL)
+			deps.Getenv = serverEnv(serverURL, map[string]string{"TEA_REPO": "alice/project"})
+			deps.Git = &fakeGit{results: map[string]string{}}
+			err := Execute(context.Background(), deps, tc.args)
+			if tc.err != "" {
+				require.ErrorContains(t, err, tc.err)
+			}
+			if err != nil {
+				require.NotContains(t, err.Error(), "no open pull request")
+			}
+			require.Contains(t, requests, "GET /api/v1/repos/alice/project/pulls/31?state=", "err: %v", err)
+		})
+	}
+}
+
+func TestPullMergeKeepsOpenOnlyLookup(t *testing.T) {
+	var requests []string
+	serverURL := closedLookupServer(t, &requests)
+	deps, _, _ := serverDeps(t, serverURL)
+	deps.Getenv = serverEnv(serverURL, map[string]string{"TEA_REPO": "alice/project"})
+	deps.Git = &fakeGit{results: map[string]string{}}
+	err := Execute(context.Background(), deps, []string{"pr", "merge", "gone", "--yes", "--no-input"})
+	require.ErrorContains(t, err, `no open pull request for branch "gone"`)
+	require.NotContains(t, strings.Join(requests, "\n"), "state=closed")
+}

internal/app/pull_mutations.go

@@ -79,7 +79,7 @@ func (a *application) pullStateCommand(closing bool) *cobra.Command {
 	var comment string
 	var deleteBranch bool
 	cmd := &cobra.Command{Use: verb + " [<number> | <url> | <branch>]", Short: titleCase(verb) + " a pull request", Annotations: pullArgumentsAnnotation(nil), Args: usageArgs(cobra.MaximumNArgs(1)), RunE: func(cmd *cobra.Command, args []string) error {
-		t, n, err := a.pullSelector(cmd, args)
+		t, n, err := a.pullSelectorAny(cmd, args)
 		if err != nil {
 			return err
 		}
@@ -176,7 +176,7 @@ func (a *application) pullDiffCommand() *cobra.Command {
 
 On a terminal the diff is colored and paged. Piped, it is written unchanged, so that
 tea pr diff 13 | git apply works.`, Annotations: pullArgumentsAnnotation(textOutput("diff returns patch text")), Args: usageArgs(cobra.MaximumNArgs(1)), RunE: func(cmd *cobra.Command, args []string) error {
-		t, n, err := a.pullSelector(cmd, args)
+		t, n, err := a.pullSelectorAny(cmd, args)
 		if err != nil {
 			return err
 		}

internal/app/pulls.go

@@ -150,7 +150,7 @@ func (a *application) pullViewCommand() *cobra.Command {
 		if comments && a.options.json != "" {
 			return clierr.Wrap(clierr.Usage, errors.New("--comments cannot be combined with --json or --jq; use tea pr comment list <number> --json or tea pr review list <number> --json"))
 		}
-		t, n, err := a.pullSelector(cmd, args)
+		t, n, err := a.pullSelectorAny(cmd, args)
 		if err != nil {
 			return err
 		}

internal/app/ref.go

@@ -196,13 +196,26 @@ func (a *application) sameRepository(first, second string) bool {
 // pullSelector resolves the pull request a pr command addresses: N, #N, OWNER/REPO#N, a pull
 // request URL, a head branch, OWNER:BRANCH, or, without an argument, the pull request of the
 // checked-out branch.
+//
+// A branch names an open pull request only; commands that mutate open pull requests use it
+// as is, and the others use pullSelectorAny.
 func (a *application) pullSelector(cmd *cobra.Command, args []string) (target, int64, error) {
+	return a.selectPull(cmd, args, false)
+}
+
+// pullSelectorAny is pullSelector that, when no open pull request has the branch, falls back
+// to the most recently updated closed or merged one, like gh.
+func (a *application) pullSelectorAny(cmd *cobra.Command, args []string) (target, int64, error) {
+	return a.selectPull(cmd, args, true)
+}
+
+func (a *application) selectPull(cmd *cobra.Command, args []string, closed bool) (target, int64, error) {
 	if len(args) == 0 || args[0] == "" {
 		// The checked-out branch says nothing about a repository chosen with --repo.
 		if a.options.repo != "" {
 			return target{}, 0, clierr.Wrap(clierr.Usage, errors.New("pass a pull request number, URL or branch with --repo"))
 		}
-		return a.currentPull(cmd.Context())
+		return a.currentPull(cmd.Context(), closed)
 	}
 	raw := args[0]
 	if _, err := parseRef(raw, pullRef); !errors.Is(err, errNotRef) {
@@ -216,7 +229,8 @@ func (a *application) pullSelector(cmd *cobra.Command, args []string) (target, i
 	if !qualified {
 		owner, branch = "", raw
 	}
-	pulls, err := (services.Pulls{Client: t.client, Repository: t.Repo}).ListOpen(cmd.Context())
+	service := services.Pulls{Client: t.client, Repository: t.Repo}
+	pulls, err := service.ListOpen(cmd.Context())
 	if err != nil {
 		return t, 0, err
 	}
@@ -224,6 +238,14 @@ func (a *application) pullSelector(cmd *cobra.Command, args []string) (target, i
 	if err != nil {
 		return t, 0, err
 	}
+	if n == 0 && closed {
+		if n, err = newestClosedForBranch(cmd.Context(), service, owner, branch, false, t.Repo); err != nil {
+			return t, 0, err
+		}
+		if n > 0 {
+			return t, n, nil
+		}
+	}
 	if n == 0 {
 		return t, 0, fmt.Errorf("no open pull request for branch %q in %s; pass a number, URL or branch", raw, t.Repo)
 	}
@@ -233,8 +255,9 @@ func (a *application) pullSelector(cmd *cobra.Command, args []string) (target, i
 // currentPull finds the pull request of the checked-out branch: the one pr checkout recorded
 // while it is open, else the open pull request whose head is the branch's upstream (and the
 // upstream remote's owner), else one of this repository whose head has the local branch's name, else N from a pr/N
-// branch, else the recorded pull request even though it is no longer open.
-func (a *application) currentPull(ctx context.Context) (target, int64, error) {
+// branch, else the recorded pull request even though it is no longer open. With closed, the
+// newest closed or merged pull request for the branch comes last.
+func (a *application) currentPull(ctx context.Context, closed bool) (target, int64, error) {
 	branch, err := git.CurrentBranchConfig(ctx, a.gitProbe(), a.options.cwd)
 	if err != nil {
 		return target{}, 0, clierr.Wrap(clierr.Usage, errors.New("not on a branch; pass a pull request number, URL or branch"))
@@ -256,6 +279,7 @@ func (a *application) currentPull(ctx context.Context) (target, int64, error) {
 	if err != nil {
 		return t, 0, err
 	}
+	upstreamOwner := ""
 	if branch.Merge != "" {
 		owner := ""
 		if remoteURL, err := a.gitProbe().Output(ctx, a.options.cwd, false, "remote", "get-url", branch.Remote); err == nil {
@@ -266,6 +290,7 @@ func (a *application) currentPull(ctx context.Context) (target, int64, error) {
 		if n, err := pullForBranch(pulls, owner, branch.Merge, t.Repo); owner != "" && (n > 0 || err != nil) {
 			return t, n, err
 		}
+		upstreamOwner = owner
 	}
 	// A bare branch name only identifies the repository's own pull requests: a contributor's
 	// fork may use main or fix as its head branch too.
@@ -281,9 +306,34 @@ func (a *application) currentPull(ctx context.Context) (target, int64, error) {
 	if recorded > 0 {
 		return t, recorded, nil
 	}
+	if closed {
+		// Same matching as above: the upstream's owner first, then the repository's own branches.
+		if upstreamOwner != "" {
+			if n, err := newestClosedForBranch(ctx, service, upstreamOwner, branch.Merge, false, t.Repo); n > 0 || err != nil {
+				return t, n, err
+			}
+		}
+		if n, err := newestClosedForBranch(ctx, service, "", branch.Name, true, t.Repo); n > 0 || err != nil {
+			return t, n, err
+		}
+	}
 	return t, 0, fmt.Errorf("no open pull request for branch %q in %s; pass a number, URL or branch", branch.Name, t.Repo)
 }
 
+// newestClosedForBranch returns the number of the most recently updated closed or merged pull
+// request whose head is branch in a repository of owner (any owner when empty), or 0. With own,
+// only pull requests from the repository itself count, as a fork may reuse the branch name.
+func newestClosedForBranch(ctx context.Context, service services.Pulls, owner, branch string, own bool, repo string) (int64, error) {
+	pull, found, err := service.NewestClosed(ctx, func(pull services.Pull) bool {
+		headOwner, _, _ := strings.Cut(pull.HeadRepo, "/")
+		return pull.Head == branch && (owner == "" || strings.EqualFold(headOwner, owner)) && (!own || strings.EqualFold(pull.HeadRepo, repo))
+	})
+	if err != nil || !found {
+		return 0, err
+	}
+	return pull.Number, nil
+}
+
 // remoteOwns reports whether the Git remote named remote points at the target's repository.
 func (a *application) remoteOwns(ctx context.Context, t target, remote string) bool {
 	raw, err := a.gitProbe().Output(ctx, a.options.cwd, false, "remote", "get-url", remote)

internal/app/ref_test.go

@@ -82,19 +82,25 @@ func refApplication(t *testing.T, gitResults map[string]string) (*application, s
 		]`)
 	}))
 	t.Cleanup(server.Close)
+	return refApplicationWith(t, server.URL, gitResults)
+}
+
+// refApplicationWith is refApplication for an existing server.
+func refApplicationWith(t *testing.T, serverURL string, gitResults map[string]string) (*application, string) {
+	t.Helper()
 	deps, _, _ := testDeps(t)
-	deps.Getenv = serverEnv(server.URL, map[string]string{"TEA_REPO": "alice/project"})
+	deps.Getenv = serverEnv(serverURL, map[string]string{"TEA_REPO": "alice/project"})
 	results := map[string]string{
-		"remote get-url origin":              server.URL + "/alice/project.git",
-		"remote get-url pulls/bob/project":   server.URL + "/bob/project.git",
-		"remote get-url fork":                server.URL + "/bob/project.git",
-		"remote get-url pulls/carol/project": server.URL + "/carol/project.git",
+		"remote get-url origin":              serverURL + "/alice/project.git",
+		"remote get-url pulls/bob/project":   serverURL + "/bob/project.git",
+		"remote get-url fork":                serverURL + "/bob/project.git",
+		"remote get-url pulls/carol/project": serverURL + "/carol/project.git",
 	}
 	for key, value := range gitResults {
 		results[key] = value
 	}
 	deps.Git = &fakeGit{results: results}
-	return &application{deps: deps}, server.URL
+	return &application{deps: deps}, serverURL
 }
 
 func commandContext() *cobra.Command {

internal/app/status.go

@@ -96,7 +96,7 @@ func (a *application) currentPullStatus(cmd *cobra.Command) (*services.Pull, pul
 	if err != nil {
 		return nil, details, ""
 	}
-	t, n, err := a.pullSelector(cmd, nil)
+	t, n, err := a.pullSelectorAny(cmd, nil)
 	if err != nil {
 		return nil, details, branch
 	}

internal/services/pulls.go

@@ -276,6 +276,26 @@ func (s Pulls) ListOpen(ctx context.Context) ([]Pull, error) {
 	})
 }
 
+// NewestClosed returns the most recently updated closed or merged pull request that keep
+// accepts, and whether there is one. It reads pages newest first and stops at the first match.
+func (s Pulls) NewestClosed(ctx context.Context, keep func(Pull) bool) (Pull, bool, error) {
+	for page := 1; page <= maxListPages; page++ {
+		items, _, err := s.List(ctx, PullListOptions{State: "closed", Sort: "recentupdate", Limit: 50, Page: page})
+		if err != nil {
+			return Pull{}, false, err
+		}
+		if len(items) == 0 {
+			return Pull{}, false, nil
+		}
+		for _, item := range items {
+			if keep(item) {
+				return item, true, nil
+			}
+		}
+	}
+	return Pull{}, false, nil
+}
+
 // Create opens a pull request.
 func (s Pulls) Create(ctx context.Context, opts PullOptions) (Pull, error) {
 	// TODO(sdk): CreatePullRequestOption lacks allow_maintainer_edit.