You are implementing Task 4 of the birdseye known-modules cache implementation plan — shell completion via cobra `ValidArgsFunction` on the `diff` and `versions` subcommands.

## Working Environment

- **Worktree path:** `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye`
- **Git branch:** `worktree-birdseye`
- **HEAD:** `51a2c0e` (Task 3: cache module address after successful CLI diff)
- Use absolute paths or `cd` into the worktree.
- **NEVER push.** **NEVER `git add .` / `git add -A`.**

## Context

Tasks 1-3 built the `internal/known` package and added a `--known-modules-file` flag + post-success cache write to `cmd/diff.go`. The `resolveKnownPath(override string) string` helper exists in `diff.go` and is reusable.

Your job: add cobra `ValidArgsFunction` for shell tab-completion on BOTH the diff and versions subcommands. The diff subcommand already has its `--known-modules-file` flag (from Task 3); the versions subcommand needs the same flag added because it's currently flagless.

Cobra exposes a `__complete` pseudo-command that lets tests drive completion directly: `root.SetArgs([]string{"__complete", "diff", "--known-modules-file", knownFile, ""})` triggers the registered ValidArgsFunction and writes the suggestions to stdout, one per line.

Note: `birdseye versions ns/n/p` success does NOT add to the cache (intentional). Only diff and the interactive picker write. But versions DOES read the cache for completion — that's the asymmetry.

## Task Description (Verbatim)

### Task 4: `cmd/diff` + `cmd/versions` — ValidArgsFunction for shell completion

**Files:**
- Modify: `apps/birdseye/cmd/diff.go`
- Modify: `apps/birdseye/cmd/versions.go`
- Modify: `apps/birdseye/cmd/versions_test.go`
- Modify: `apps/birdseye/cmd/diff_test.go`

- [ ] **Step 1: Write failing tests** — append to `apps/birdseye/cmd/diff_test.go`:

```go
func TestDiffValidArgsFunctionLoadsCache(t *testing.T) {
	knownFile := filepath.Join(t.TempDir(), "known-modules")
	if err := os.WriteFile(knownFile, []byte("alpha/aaa/aws\nbravo/bbb/gcp\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	root := NewRootCmd()
	root.SetArgs([]string{"__complete", "diff", "--known-modules-file", knownFile, ""})
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute completion: %v", err)
	}
	out := stdout.String()
	for _, want := range []string{"alpha/aaa/aws", "bravo/bbb/gcp"} {
		if !strings.Contains(out, want) {
			t.Errorf("completion output missing %q\n%s", want, out)
		}
	}
}
```

And to `apps/birdseye/cmd/versions_test.go`:

```go
import (
	// existing imports preserved
	"os"
	"path/filepath"
)

func TestVersionsValidArgsFunctionLoadsCache(t *testing.T) {
	knownFile := filepath.Join(t.TempDir(), "known-modules")
	if err := os.WriteFile(knownFile, []byte("alpha/aaa/aws\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	root := NewRootCmd()
	root.SetArgs([]string{"__complete", "versions", "--known-modules-file", knownFile, ""})
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute completion: %v", err)
	}
	if !strings.Contains(stdout.String(), "alpha/aaa/aws") {
		t.Errorf("completion missing entry:\n%s", stdout.String())
	}
}

func TestVersionsDoesNotAddToKnown(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_ = json.NewEncoder(w).Encode(api.ListVersionsResponse{
			Modules: []api.ModuleVersions{
				{Versions: []api.VersionEntry{{Version: "1.0.0"}}},
			},
		})
	}))
	defer srv.Close()

	knownFile := filepath.Join(t.TempDir(), "known-modules")
	root := NewRootCmd()
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	root.SetArgs([]string{"versions", "iac/comply/aws",
		"--crow-url", srv.URL,
		"--known-modules-file", knownFile,
	})
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute: %v", err)
	}
	if _, statErr := os.Stat(knownFile); !os.IsNotExist(statErr) {
		t.Errorf("known-modules file should NOT exist after versions, stat err=%v", statErr)
	}
}
```

NOTE: Merge new imports into the existing block. `os`, `path/filepath`, `http`, `httptest`, `json`, `api` may need to be added depending on what's already imported.

- [ ] **Step 2: Run, expect FAIL** (versions has no `--known-modules-file` flag; diff has no `ValidArgsFunction`)

Run: `cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test ./cmd/... -run "TestDiffValidArgs|TestVersionsValidArgs|TestVersionsDoesNot" -v`

- [ ] **Step 3: Add `ValidArgsFunction` to `newDiffCmd` in `apps/birdseye/cmd/diff.go`**

Just before the closing `return c` of `newDiffCmd`, add:

```go
	c.ValidArgsFunction = func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
		if len(args) > 0 {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}
		suggestions, _ := known.Load(resolveKnownPath(o.KnownModulesFile))
		return suggestions, cobra.ShellCompDirectiveNoFileComp
	}
```

- [ ] **Step 4: Update `apps/birdseye/cmd/versions.go`**

Replace the existing function body with:

```go
func newVersionsCmd(g *GlobalFlags) *cobra.Command {
	var knownModulesFile string
	c := &cobra.Command{
		Use:           "versions <module>",
		Short:         "List published versions of a Crow module",
		Args:          cobra.ExactArgs(1),
		SilenceUsage:  true,
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			id, err := parseModuleAddress(args[0])
			if err != nil {
				return err
			}
			cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
			versions, err := cli.ListVersions(cmd.Context(), id)
			if err != nil {
				return err
			}
			for _, v := range versions {
				fmt.Fprintln(cmd.OutOrStdout(), v)
			}
			return nil
		},
	}
	c.Flags().StringVar(&knownModulesFile, "known-modules-file", "", "override known-modules autocomplete file (mostly for tests)")
	_ = c.Flags().MarkHidden("known-modules-file")
	c.ValidArgsFunction = func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
		if len(args) > 0 {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}
		suggestions, _ := known.Load(resolveKnownPath(knownModulesFile))
		return suggestions, cobra.ShellCompDirectiveNoFileComp
	}
	return c
}
```

Add `"github.com/immuta/operations/apps/birdseye/internal/known"` to the imports of `versions.go`.

- [ ] **Step 5: Run, expect PASS**

Run: `cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test -race ./cmd/... -v`
Expected: All previous + 3 new tests PASS.

- [ ] **Step 6: Verify build**

Run: `cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go vet ./... && go build ./...`
Expected: clean.

- [ ] **Step 7: Commit**

```bash
cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye && git add apps/birdseye/cmd/ && git commit -m "feat(birdseye): shell completion for diff and versions from known-modules cache"
```

## Notes & Style

- The cobra `__complete` pseudo-command is the official testing surface for `ValidArgsFunction`. It writes one suggestion per line followed by a `:N` directive line — `strings.Contains` is enough for test assertions.
- `cobra.ShellCompDirectiveNoFileComp` disables fallback filename completion, so users don't see local files mixed with module addresses.
- The `if len(args) > 0` guard means we only suggest module addresses for the FIRST positional arg. Subsequent args (versions) get no suggestions.
- `versions` reuses `resolveKnownPath` from `diff.go` (same package) — no need to duplicate.
- `versions.go` declares its own local `knownModulesFile` var (not on `diffOpts`) because there's no per-command opts struct for versions; that's fine and idiomatic.

## Code Organization

`diff.go` and `versions.go` each get the small `ValidArgsFunction` addition inline. No new files.

## Self-Review Checklist

- [ ] All 3 new tests pass under `-race`
- [ ] All previous tests still pass
- [ ] `go vet ./...` clean
- [ ] `go build ./...` succeeds
- [ ] `versions` does NOT call `known.Add` anywhere
- [ ] `versions` DOES read the cache via `Load` in its ValidArgsFunction
- [ ] Both subcommands return `ShellCompDirectiveNoFileComp` to suppress filename fallback
- [ ] Commit message exactly: `feat(birdseye): shell completion for diff and versions from known-modules cache`

## Report Format

- **Status:** DONE | DONE_WITH_CONCERNS | BLOCKED | NEEDS_CONTEXT
- Files modified
- Test count + race-clean
- Commit SHA
- Anything unexpected


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I'll implement Task 4 following the TDD approach outlined in the plan. Let me start by reading the existing files.


1	package cmd
2
3	import (
4		"context"
5		"encoding/json"
6		"fmt"
7		"io"
8		"net/http"
9		"os"
10		"path/filepath"
11		"strings"
12		"time"
13
14		tea "github.com/charmbracelet/bubbletea"
15		"github.com/spf13/cobra"
16		"golang.org/x/term"
17
18		"github.com/immuta/operations/apps/birdseye/internal/archive"
19		"github.com/immuta/operations/apps/birdseye/internal/diff"
20		"github.com/immuta/operations/apps/birdseye/internal/known"
21		"github.com/immuta/operations/apps/birdseye/internal/registry"
22		"github.com/immuta/operations/apps/birdseye/internal/tui"
23		"github.com/immuta/operations/services/crow/pkg/api"
24		"github.com/immuta/operations/services/crow/pkg/client"
25	)
26
27	// diffOpts holds the resolved options for `birdseye diff`.
28	type diffOpts struct {
29		Semantic         bool
30		Plain            bool
31		CacheDir         string
32		KnownModulesFile string // test override for known-modules cache path
33	}
34
35	const maxArchiveBytes = 50 << 20 // 50 MiB safety cap on uncompressed size
36
37	func newDiffCmd(g *GlobalFlags) *cobra.Command {
38		o := &diffOpts{}
39		c := &cobra.Command{
40			Use:   "diff [module] [versionA] [versionB]",
41			Short: "Diff two versions of a Crow module",
42			Long: "Diff two versions of a module hosted in Crow.\n\n" +
43				"If module/versions are omitted, the interactive TUI launches\n" +
44				"(see picker task). With --plain, prints unified diff to stdout.",
45			Args:          cobra.MaximumNArgs(3),
46			SilenceUsage:  true,
47			SilenceErrors: true,
48			RunE: func(cmd *cobra.Command, args []string) error {
49				return runDiff(cmd.Context(), cmd, args, g, o)
50			},
51		}
52		c.Flags().BoolVar(&o.Semantic, "semantic", false, "include HCL-aware semantic diff alongside textual")
53		c.Flags().BoolVar(&o.Plain, "plain", false, "force plain (non-TUI) output")
54		c.Flags().BoolVar(&o.Plain, "no-tui", false, "alias for --plain")
55		c.Flags().StringVar(&o.CacheDir, "cache-dir", defaultCacheDir(), "module tarball cache directory")
56		c.Flags().StringVar(&o.KnownModulesFile, "known-modules-file", "", "override known-modules autocomplete file (mostly for tests)")
57		_ = c.Flags().MarkHidden("known-modules-file")
58		return c
59	}
60
61	func defaultCacheDir() string {
62		if home, err := os.UserCacheDir(); err == nil {
63			return filepath.Join(home, "birdseye")
64		}
65		return ".birdseye-cache"
66	}
67
68	// resolveKnownPath returns override if non-empty, otherwise the default
69	// known.Path(). Errors fall back to "" so Load and Add become no-ops.
70	func resolveKnownPath(override string) string {
71		if override != "" {
72			return override
73		}
74		p, err := known.Path()
75		if err != nil {
76			return ""
77		}
78		return p
79	}
80
81	func newHTTPClient(d time.Duration) *http.Client {
82		return &http.Client{Timeout: d}
83	}
84
85	func parseModuleAddress(s string) (api.ModuleIdentifier, error) {
86		parts := strings.Split(s, "/")
87		if len(parts) != 3 {
88			return api.ModuleIdentifier{}, fmt.Errorf("%w: module address must be namespace/name/provider, got %q", ErrUsage, s)
89		}
90		id := api.ModuleIdentifier{Namespace: parts[0], Name: parts[1], Provider: parts[2]}
91		if err := id.Validate(); err != nil {
92			return api.ModuleIdentifier{}, fmt.Errorf("%w: %v", ErrUsage, err)
93		}
94		return id, nil
95	}
96
97	func runDiff(ctx context.Context, cmd *cobra.Command, args []string, g *GlobalFlags, o *diffOpts) error {
98		if len(args) == 0 {
99			return runInteractive(ctx, cmd, g, o)
100		}
101		if len(args) != 3 {
102			return fmt.Errorf("%w: diff requires <module> <versionA> <versionB>", ErrUsage)
103		}
104		id, err := parseModuleAddress(args[0])
105		if err != nil {
106			return err
107		}
108		if err := api.ValidateVersion(args[1]); err != nil {
109			return fmt.Errorf("%w: %v", ErrUsage, err)
110		}
111		if err := api.ValidateVersion(args[2]); err != nil {
112			return fmt.Errorf("%w: %v", ErrUsage, err)
113		}
114		modA := api.Module{ModuleIdentifier: id, Version: args[1]}
115		modB := api.Module{ModuleIdentifier: id, Version: args[2]}
116
117		cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
118		cache, err := registry.NewDiskCache(o.CacheDir)
119		if err != nil {
120			return fmt.Errorf("cache init: %w", err)
121		}
122		reg := registry.New(cli, cache)
123
124		aBytes, bBytes, err := reg.FetchPair(ctx, modA, modB)
125		if err != nil {
126			return err
127		}
128
129		modAExtracted, err := archive.Extract(aBytes, maxArchiveBytes)
130		if err != nil {
131			return fmt.Errorf("%w: %v", ErrArchive, err)
132		}
133		modBExtracted, err := archive.Extract(bBytes, maxArchiveBytes)
134		if err != nil {
135			return fmt.Errorf("%w: %v", ErrArchive, err)
136		}
137
138		result := diff.Result{Files: diff.Textual(modAExtracted, modBExtracted)}
139		if o.Semantic {
140			sem, err := diff.Semantic(modAExtracted, modBExtracted)
141			if err != nil {
142				return fmt.Errorf("%w: %v", ErrSemantic, err)
143			}
144			result.Semantic = sem
145		}
146
147		if err := known.Add(resolveKnownPath(o.KnownModulesFile),
148			id.Namespace+"/"+id.Name+"/"+id.Provider); err != nil {
149			_ = err // best-effort: cache failure does not block diff
150		}
151
152		if g.JSON {
153			return renderJSON(cmd.OutOrStdout(), result)
154		}
155		if !o.Plain && isTTY(cmd.OutOrStdout()) {
156			return tui.RunBrowser(ctx, result)
157		}
158		return renderPlain(cmd.OutOrStdout(), result)
159	}
160
161	// isTTY reports whether w is a *os.File backed by a terminal.
162	func isTTY(w io.Writer) bool {
163		f, ok := w.(*os.File)
164		if !ok {
165			return false
166		}
167		return term.IsTerminal(int(f.Fd()))
168	}
169
170	func runInteractive(ctx context.Context, cmd *cobra.Command, g *GlobalFlags, o *diffOpts) error {
171		if !isTTY(cmd.OutOrStdout()) {
172			return fmt.Errorf("%w: interactive mode requires a TTY", ErrUsage)
173		}
174		cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
175		cache, err := registry.NewDiskCache(o.CacheDir)
176		if err != nil {
177			return fmt.Errorf("cache init: %w", err)
178		}
179		reg := registry.New(cli, cache)
180
181		// Stage 1: picker → fetched bytes
182		p := tui.NewPicker(ctx, &tui.Deps{Client: cli, Reg: reg})
183		prog := tea.NewProgram(p, tea.WithAltScreen(), tea.WithContext(ctx))
184		if _, err := prog.Run(); err != nil {
185			return err
186		}
187		aBytes, bBytes := p.Bytes()
188		if aBytes == nil || bBytes == nil {
189			// User quit before completing picker; not an error.
190			return nil
191		}
192
193		// Stage 2: extract + diff + browser
194		modA, err := archive.Extract(aBytes, maxArchiveBytes)
195		if err != nil {
196			return fmt.Errorf("%w: %v", ErrArchive, err)
197		}
198		modB, err := archive.Extract(bBytes, maxArchiveBytes)
199		if err != nil {
200			return fmt.Errorf("%w: %v", ErrArchive, err)
201		}
202		result := diff.Result{Files: diff.Textual(modA, modB)}
203		if o.Semantic {
204			sem, err := diff.Semantic(modA, modB)
205			if err != nil {
206				return fmt.Errorf("%w: %v", ErrSemantic, err)
207			}
208			result.Semantic = sem
209		}
210		return tui.RunBrowser(ctx, result)
211	}
212
213	// renderPlain writes the diff result to w in unified-diff format.
214	// "no differences" is emitted when there are zero files in the result.
215	func renderPlain(w io.Writer, r diff.Result) error {
216		if len(r.Files) == 0 && len(r.Semantic) == 0 {
217			_, err := fmt.Fprintln(w, "no differences")
218			return err
219		}
220		for i, fd := range r.Files {
221			if i > 0 {
222				_, _ = fmt.Fprintln(w)
223			}
224			_, _ = fmt.Fprintf(w, "=== %s (%s) +%d -%d\n", fd.Path, fd.Status, fd.Adds, fd.Dels)
225			_, _ = fmt.Fprint(w, fd.Unified)
226		}
227		if len(r.Semantic) > 0 {
228			_, _ = fmt.Fprintln(w)
229			_, _ = fmt.Fprintln(w, "=== semantic changes ===")
230			for _, c := range r.Semantic {
231				_, _ = fmt.Fprintf(w, "%s %s %s\n", c.Status, c.Kind, c.Name)
232			}
233		}
234		return nil
235	}
236
237	func renderJSON(w io.Writer, r diff.Result) error {
238		type fileOut struct {
239			Path    string `json:"path"`
240			Status  string `json:"status"`
241			Adds    int    `json:"adds"`
242			Dels    int    `json:"dels"`
243			Unified string `json:"unified"`
244		}
245		type semOut struct {
246			Kind   string `json:"kind"`
247			Name   string `json:"name"`
248			Status string `json:"status"`
249			Detail string `json:"detail,omitempty"`
250		}
251		type payload struct {
252			Files    []fileOut `json:"files"`
253			Semantic []semOut  `json:"semantic,omitempty"`
254		}
255		out := payload{Files: make([]fileOut, 0, len(r.Files))}
256		for _, fd := range r.Files {
257			out.Files = append(out.Files, fileOut{Path: fd.Path, Status: fd.Status.String(), Adds: fd.Adds, Dels: fd.Dels, Unified: fd.Unified})
258		}
259		for _, c := range r.Semantic {
260			out.Semantic = append(out.Semantic, semOut{Kind: c.Kind, Name: c.Name, Status: c.Status.String(), Detail: c.Detail})
261		}
262		return json.NewEncoder(w).Encode(out)
263	}
264


1	package cmd
2
3	import (
4		"fmt"
5
6		"github.com/spf13/cobra"
7
8		"github.com/immuta/operations/services/crow/pkg/client"
9	)
10
11	func newVersionsCmd(g *GlobalFlags) *cobra.Command {
12		return &cobra.Command{
13			Use:           "versions <module>",
14			Short:         "List published versions of a Crow module",
15			Args:          cobra.ExactArgs(1),
16			SilenceUsage:  true,
17			SilenceErrors: true,
18			RunE: func(cmd *cobra.Command, args []string) error {
19				id, err := parseModuleAddress(args[0])
20				if err != nil {
21					return err
22				}
23				cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
24				versions, err := cli.ListVersions(cmd.Context(), id)
25				if err != nil {
26					return err
27				}
28				for _, v := range versions {
29					fmt.Fprintln(cmd.OutOrStdout(), v)
30				}
31				return nil
32			},
33		}
34	}
35


Now let me read the test files to understand current imports and patterns.


1	package cmd
2
3	import (
4		"archive/tar"
5		"bytes"
6		"compress/gzip"
7		"context"
8		"encoding/json"
9		"net/http"
10		"net/http/httptest"
11		"os"
12		"path/filepath"
13		"strings"
14		"testing"
15	)
16
17	// fakeCrow with two versions of moduleA. v1 has main.tf; v2 has main.tf
18	// (modified) and a new variables.tf.
19	func fakeCrowTwoVersions(t *testing.T) *httptest.Server {
20		t.Helper()
21		mkTgz := func(files map[string]string) []byte {
22			var buf bytes.Buffer
23			gz := gzip.NewWriter(&buf)
24			tw := tar.NewWriter(gz)
25			for n, b := range files {
26				_ = tw.WriteHeader(&tar.Header{Name: n, Mode: 0o644, Size: int64(len(b)), Typeflag: tar.TypeReg})
27				_, _ = tw.Write([]byte(b))
28			}
29			_ = tw.Close()
30			_ = gz.Close()
31			return buf.Bytes()
32		}
33		v1 := mkTgz(map[string]string{"main.tf": "resource \"aws_s3_bucket\" \"alpha\" {}\n"})
34		v2 := mkTgz(map[string]string{
35			"main.tf":      "resource \"aws_s3_bucket\" \"beta\" {}\n",
36			"variables.tf": "variable \"name\" { type = string }\n",
37		})
38
39		mux := http.NewServeMux()
40		blob := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
41			switch r.URL.Path {
42			case "/blob/1.0.0":
43				_, _ = w.Write(v1)
44			case "/blob/1.1.0":
45				_, _ = w.Write(v2)
46			default:
47				http.NotFound(w, r)
48			}
49		}))
50		t.Cleanup(blob.Close)
51		mux.HandleFunc("/v1/modules/iac/comply/aws/", func(w http.ResponseWriter, r *http.Request) {
52			parts := strings.Split(strings.TrimPrefix(r.URL.Path, "/v1/modules/iac/comply/aws/"), "/")
53			if len(parts) != 2 || parts[1] != "download" {
54				http.NotFound(w, r)
55				return
56			}
57			w.Header().Set("X-Terraform-Get", blob.URL+"/blob/"+parts[0])
58			w.WriteHeader(http.StatusNoContent)
59		})
60		srv := httptest.NewServer(mux)
61		t.Cleanup(srv.Close)
62		return srv
63	}
64
65	func TestDiffPlainOutput(t *testing.T) {
66		srv := fakeCrowTwoVersions(t)
67		root := NewRootCmd()
68		var stdout, stderr bytes.Buffer
69		root.SetOut(&stdout)
70		root.SetErr(&stderr)
71		root.SetArgs([]string{
72			"diff",
73			"iac/comply/aws", "1.0.0", "1.1.0",
74			"--crow-url", srv.URL,
75			"--plain",
76			"--cache-dir", t.TempDir(),
77		})
78		if err := root.ExecuteContext(context.Background()); err != nil {
79			t.Fatalf("execute: %v\nstderr: %s", err, stderr.String())
80		}
81		out := stdout.String()
82		for _, want := range []string{"main.tf", "variables.tf", "alpha", "beta"} {
83			if !strings.Contains(out, want) {
84				t.Errorf("plain output missing %q\n--- output ---\n%s", want, out)
85			}
86		}
87	}
88
89	func TestDiffIdenticalVersionsNoChanges(t *testing.T) {
90		srv := fakeCrowTwoVersions(t)
91		root := NewRootCmd()
92		var stdout bytes.Buffer
93		root.SetOut(&stdout)
94		root.SetArgs([]string{
95			"diff",
96			"iac/comply/aws", "1.0.0", "1.0.0",
97			"--crow-url", srv.URL,
98			"--plain",
99			"--cache-dir", t.TempDir(),
100		})
101		if err := root.ExecuteContext(context.Background()); err != nil {
102			t.Fatalf("execute: %v", err)
103		}
104		if got := strings.TrimSpace(stdout.String()); got != "no differences" {
105			t.Errorf("output = %q, want \"no differences\"", got)
106		}
107	}
108
109	func TestDiffBadModuleAddress(t *testing.T) {
110		root := NewRootCmd()
111		var stderr bytes.Buffer
112		root.SetErr(&stderr)
113		root.SetArgs([]string{"diff", "bad-address", "1.0.0", "1.1.0"})
114		err := root.ExecuteContext(context.Background())
115		if err == nil {
116			t.Fatal("expected error for bad address")
117		}
118		if ExitCode(err) != 1 {
119			t.Errorf("exit code = %d, want 1", ExitCode(err))
120		}
121	}
122
123	func TestDiffJSONOutput(t *testing.T) {
124		srv := fakeCrowTwoVersions(t)
125		root := NewRootCmd()
126		var stdout bytes.Buffer
127		root.SetOut(&stdout)
128		root.SetArgs([]string{
129			"diff",
130			"iac/comply/aws", "1.0.0", "1.1.0",
131			"--crow-url", srv.URL,
132			"--plain",
133			"--json",
134			"--cache-dir", t.TempDir(),
135		})
136		if err := root.ExecuteContext(context.Background()); err != nil {
137			t.Fatalf("execute: %v", err)
138		}
139		var payload struct {
140			Files []struct {
141				Path   string `json:"path"`
142				Status string `json:"status"`
143			} `json:"files"`
144		}
145		if err := json.Unmarshal(stdout.Bytes(), &payload); err != nil {
146			t.Fatalf("invalid json: %v\nraw:\n%s", err, stdout.String())
147		}
148		if len(payload.Files) == 0 {
149			t.Errorf("expected at least one file entry")
150		}
151	}
152
153	func TestDiffSemanticIncluded(t *testing.T) {
154		srv := fakeCrowTwoVersions(t)
155		root := NewRootCmd()
156		var stdout bytes.Buffer
157		root.SetOut(&stdout)
158		root.SetArgs([]string{
159			"diff",
160			"iac/comply/aws", "1.0.0", "1.1.0",
161			"--crow-url", srv.URL,
162			"--plain",
163			"--semantic",
164			"--cache-dir", t.TempDir(),
165		})
166		if err := root.ExecuteContext(context.Background()); err != nil {
167			t.Fatalf("execute: %v", err)
168		}
169		out := stdout.String()
170		for _, want := range []string{
171			"=== semantic changes ===",
172			"resource",
173			"aws_s3_bucket.alpha",
174			"aws_s3_bucket.beta",
175			"variable",
176			"name",
177		} {
178			if !strings.Contains(out, want) {
179				t.Errorf("semantic output missing %q\n--- output ---\n%s", want, out)
180			}
181		}
182	}
183
184	func TestDiffAddsToKnownAfterSuccess(t *testing.T) {
185		srv := fakeCrowTwoVersions(t)
186		knownFile := filepath.Join(t.TempDir(), "known-modules")
187		root := NewRootCmd()
188		var stdout bytes.Buffer
189		root.SetOut(&stdout)
190		root.SetArgs([]string{
191			"diff",
192			"iac/comply/aws", "1.0.0", "1.1.0",
193			"--crow-url", srv.URL,
194			"--plain",
195			"--cache-dir", t.TempDir(),
196			"--known-modules-file", knownFile,
197		})
198		if err := root.ExecuteContext(context.Background()); err != nil {
199			t.Fatalf("execute: %v", err)
200		}
201		body, err := os.ReadFile(knownFile)
202		if err != nil {
203			t.Fatalf("known-modules file not created: %v", err)
204		}
205		if !strings.Contains(string(body), "iac/comply/aws") {
206			t.Errorf("known-modules missing address:\n%s", body)
207		}
208	}
209
210	func TestDiffDoesNotAddOnFailure(t *testing.T) {
211		mux := http.NewServeMux()
212		// All download attempts return 404
213		mux.HandleFunc("/v1/modules/", func(w http.ResponseWriter, _ *http.Request) {
214			w.WriteHeader(http.StatusNotFound)
215		})
216		srv := httptest.NewServer(mux)
217		t.Cleanup(srv.Close)
218
219		knownFile := filepath.Join(t.TempDir(), "known-modules")
220		root := NewRootCmd()
221		root.SetErr(&bytes.Buffer{})
222		root.SetArgs([]string{
223			"diff",
224			"iac/comply/aws", "1.0.0", "1.1.0",
225			"--crow-url", srv.URL,
226			"--plain",
227			"--cache-dir", t.TempDir(),
228			"--known-modules-file", knownFile,
229		})
230		if err := root.ExecuteContext(context.Background()); err == nil {
231			t.Fatal("expected error for 404s")
232		}
233		if _, statErr := os.Stat(knownFile); !os.IsNotExist(statErr) {
234			t.Errorf("known-modules file should NOT exist after failure, stat err=%v", statErr)
235		}
236	}
237


1	package cmd
2
3	import (
4		"bytes"
5		"context"
6		"encoding/json"
7		"net/http"
8		"net/http/httptest"
9		"strings"
10		"testing"
11
12		"github.com/immuta/operations/services/crow/pkg/api"
13	)
14
15	func TestVersionsCmd(t *testing.T) {
16		srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
17			if r.URL.Path != "/v1/modules/iac/comply/aws/versions" {
18				http.NotFound(w, r)
19				return
20			}
21			_ = json.NewEncoder(w).Encode(api.ListVersionsResponse{
22				Modules: []api.ModuleVersions{
23					{Versions: []api.VersionEntry{{Version: "1.0.0"}, {Version: "1.1.0"}}},
24				},
25			})
26		}))
27		defer srv.Close()
28
29		root := NewRootCmd()
30		var stdout bytes.Buffer
31		root.SetOut(&stdout)
32		root.SetArgs([]string{"versions", "iac/comply/aws", "--crow-url", srv.URL})
33		if err := root.ExecuteContext(context.Background()); err != nil {
34			t.Fatalf("execute: %v", err)
35		}
36		out := stdout.String()
37		if !strings.Contains(out, "1.0.0") || !strings.Contains(out, "1.1.0") {
38			t.Errorf("versions output missing entries:\n%s", out)
39		}
40	}
41


Good. Now I have a clear picture. Let me implement the steps.

**Step 1: Add the failing test to diff_test.go**


Edit

func TestDiffDoesNotAddOnFailure(t *testing.T) {
	mux := http.NewServeMux()
	// All download attempts return 404
	mux.HandleFunc("/v1/modules/", func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusNotFound)
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	knownFile := filepath.Join(t.TempDir(), "known-modules")
	root := NewRootCmd()
	root.SetErr(&bytes.Buffer{})
	root.SetArgs([]string{
		"diff",
		"iac/comply/aws", "1.0.0", "1.1.0",
		"--crow-url", srv.URL,
		"--plain",
		"--cache-dir", t.TempDir(),
		"--known-modules-file", knownFile,
	})
	if err := root.ExecuteContext(context.Background()); err == nil {
		t.Fatal("expected error for 404s")
	}
	if _, statErr := os.Stat(knownFile); !os.IsNotExist(statErr) {
		t.Errorf("known-modules file should NOT exist after failure, stat err=%v", statErr)
	}
}

func TestDiffDoesNotAddOnFailure(t *testing.T) {
	mux := http.NewServeMux()
	// All download attempts return 404
	mux.HandleFunc("/v1/modules/", func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusNotFound)
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	knownFile := filepath.Join(t.TempDir(), "known-modules")
	root := NewRootCmd()
	root.SetErr(&bytes.Buffer{})
	root.SetArgs([]string{
		"diff",
		"iac/comply/aws", "1.0.0", "1.1.0",
		"--crow-url", srv.URL,
		"--plain",
		"--cache-dir", t.TempDir(),
		"--known-modules-file", knownFile,
	})
	if err := root.ExecuteContext(context.Background()); err == nil {
		t.Fatal("expected error for 404s")
	}
	if _, statErr := os.Stat(knownFile); !os.IsNotExist(statErr) {
		t.Errorf("known-modules file should NOT exist after failure, stat err=%v", statErr)
	}
}

func TestDiffValidArgsFunctionLoadsCache(t *testing.T) {
	knownFile := filepath.Join(t.TempDir(), "known-modules")
	if err := os.WriteFile(knownFile, []byte("alpha/aaa/aws\nbravo/bbb/gcp\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	root := NewRootCmd()
	root.SetArgs([]string{"__complete", "diff", "--known-modules-file", knownFile, ""})
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute completion: %v", err)
	}
	out := stdout.String()
	for _, want := range []string{"alpha/aaa/aws", "bravo/bbb/gcp"} {
		if !strings.Contains(out, want) {
			t.Errorf("completion output missing %q\n%s", want, out)
		}
	}
}


The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/diff_test.go has been updated successfully. (file state is current in your context — no need to Read it back)


**Step 1b: Add the failing tests to versions_test.go**


package cmd

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/immuta/operations/services/crow/pkg/api"
)

package cmd

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/immuta/operations/services/crow/pkg/api"
)


The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/versions_test.go has been updated successfully. (file state is current in your context — no need to Read it back)


func TestVersionsCmd(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/modules/iac/comply/aws/versions" {
			http.NotFound(w, r)
			return
		}
		_ = json.NewEncoder(w).Encode(api.ListVersionsResponse{
			Modules: []api.ModuleVersions{
				{Versions: []api.VersionEntry{{Version: "1.0.0"}, {Version: "1.1.0"}}},
			},
		})
	}))
	defer srv.Close()

	root := NewRootCmd()
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	root.SetArgs([]string{"versions", "iac/comply/aws", "--crow-url", srv.URL})
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute: %v", err)
	}
	out := stdout.String()
	if !strings.Contains(out, "1.0.0") || !strings.Contains(out, "1.1.0") {
		t.Errorf("versions output missing entries:\n%s", out)
	}
}

func TestVersionsCmd(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/modules/iac/comply/aws/versions" {
			http.NotFound(w, r)
			return
		}
		_ = json.NewEncoder(w).Encode(api.ListVersionsResponse{
			Modules: []api.ModuleVersions{
				{Versions: []api.VersionEntry{{Version: "1.0.0"}, {Version: "1.1.0"}}},
			},
		})
	}))
	defer srv.Close()

	root := NewRootCmd()
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	root.SetArgs([]string{"versions", "iac/comply/aws", "--crow-url", srv.URL})
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute: %v", err)
	}
	out := stdout.String()
	if !strings.Contains(out, "1.0.0") || !strings.Contains(out, "1.1.0") {
		t.Errorf("versions output missing entries:\n%s", out)
	}
}

func TestVersionsValidArgsFunctionLoadsCache(t *testing.T) {
	knownFile := filepath.Join(t.TempDir(), "known-modules")
	if err := os.WriteFile(knownFile, []byte("alpha/aaa/aws\n"), 0o600); err != nil {
		t.Fatal(err)
	}

	root := NewRootCmd()
	root.SetArgs([]string{"__complete", "versions", "--known-modules-file", knownFile, ""})
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute completion: %v", err)
	}
	if !strings.Contains(stdout.String(), "alpha/aaa/aws") {
		t.Errorf("completion missing entry:\n%s", stdout.String())
	}
}

func TestVersionsDoesNotAddToKnown(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_ = json.NewEncoder(w).Encode(api.ListVersionsResponse{
			Modules: []api.ModuleVersions{
				{Versions: []api.VersionEntry{{Version: "1.0.0"}}},
			},
		})
	}))
	defer srv.Close()

	knownFile := filepath.Join(t.TempDir(), "known-modules")
	root := NewRootCmd()
	var stdout bytes.Buffer
	root.SetOut(&stdout)
	root.SetArgs([]string{"versions", "iac/comply/aws",
		"--crow-url", srv.URL,
		"--known-modules-file", knownFile,
	})
	if err := root.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("execute: %v", err)
	}
	if _, statErr := os.Stat(knownFile); !os.IsNotExist(statErr) {
		t.Errorf("known-modules file should NOT exist after versions, stat err=%v", statErr)
	}
}


**Step 2: Run tests to confirm they fail**


Bash

cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test ./cmd/... -run "TestDiffValidArgs|TestVersionsValidArgs|TestVersionsDoesNot" -v 2>&1

Run new tests expecting failure


Error: Exit code 1
=== RUN   TestDiffValidArgsFunctionLoadsCache
Completion ended with directive: ShellCompDirectiveDefault
    diff_test.go:254: completion output missing "alpha/aaa/aws"
        :0
    diff_test.go:254: completion output missing "bravo/bbb/gcp"
        :0
--- FAIL: TestDiffValidArgsFunctionLoadsCache (0.00s)
=== RUN   TestVersionsValidArgsFunctionLoadsCache
[Debug] [Error] Error while parsing flags from args [--known-modules-file /var/folders/f_/krc48r2d0c9_vwzbl5lk9qcm0000gp/T/TestVersionsValidArgsFunctionLoadsCache537817331/001/known-modules]: unknown flag: --known-modules-file
Completion ended with directive: ShellCompDirectiveDefault
    versions_test.go:58: completion missing entry:
        :0
--- FAIL: TestVersionsValidArgsFunctionLoadsCache (0.00s)
=== RUN   TestVersionsDoesNotAddToKnown
    versions_test.go:81: execute: unknown flag: --known-modules-file
--- FAIL: TestVersionsDoesNotAddToKnown (0.00s)
FAIL
FAIL	github.com/immuta/operations/apps/birdseye/cmd	4.575s
FAIL


Tests fail as expected. Now let me implement the fixes.

**Step 3: Add `ValidArgsFunction` to `newDiffCmd` in diff.go**


Edit

	c.Flags().StringVar(&o.KnownModulesFile, "known-modules-file", "", "override known-modules autocomplete file (mostly for tests)")
	_ = c.Flags().MarkHidden("known-modules-file")
	return c
}

	c.Flags().StringVar(&o.KnownModulesFile, "known-modules-file", "", "override known-modules autocomplete file (mostly for tests)")
	_ = c.Flags().MarkHidden("known-modules-file")
	c.ValidArgsFunction = func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
		if len(args) > 0 {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}
		suggestions, _ := known.Load(resolveKnownPath(o.KnownModulesFile))
		return suggestions, cobra.ShellCompDirectiveNoFileComp
	}
	return c
}


The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/diff.go has been updated successfully. (file state is current in your context — no need to Read it back)


**Step 4: Update `versions.go` with the new function body including the flag and `ValidArgsFunction`**


package cmd

import (
	"fmt"

	"github.com/spf13/cobra"

	"github.com/immuta/operations/services/crow/pkg/client"
)

func newVersionsCmd(g *GlobalFlags) *cobra.Command {
	return &cobra.Command{
		Use:           "versions <module>",
		Short:         "List published versions of a Crow module",
		Args:          cobra.ExactArgs(1),
		SilenceUsage:  true,
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			id, err := parseModuleAddress(args[0])
			if err != nil {
				return err
			}
			cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
			versions, err := cli.ListVersions(cmd.Context(), id)
			if err != nil {
				return err
			}
			for _, v := range versions {
				fmt.Fprintln(cmd.OutOrStdout(), v)
			}
			return nil
		},
	}
}

package cmd

import (
	"fmt"

	"github.com/spf13/cobra"

	"github.com/immuta/operations/apps/birdseye/internal/known"
	"github.com/immuta/operations/services/crow/pkg/client"
)

func newVersionsCmd(g *GlobalFlags) *cobra.Command {
	var knownModulesFile string
	c := &cobra.Command{
		Use:           "versions <module>",
		Short:         "List published versions of a Crow module",
		Args:          cobra.ExactArgs(1),
		SilenceUsage:  true,
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			id, err := parseModuleAddress(args[0])
			if err != nil {
				return err
			}
			cli := client.New(g.CrowURL, client.WithHTTPClient(newHTTPClient(g.Timeout)))
			versions, err := cli.ListVersions(cmd.Context(), id)
			if err != nil {
				return err
			}
			for _, v := range versions {
				fmt.Fprintln(cmd.OutOrStdout(), v)
			}
			return nil
		},
	}
	c.Flags().StringVar(&knownModulesFile, "known-modules-file", "", "override known-modules autocomplete file (mostly for tests)")
	_ = c.Flags().MarkHidden("known-modules-file")
	c.ValidArgsFunction = func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
		if len(args) > 0 {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}
		suggestions, _ := known.Load(resolveKnownPath(knownModulesFile))
		return suggestions, cobra.ShellCompDirectiveNoFileComp
	}
	return c
}


The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/versions.go has been updated successfully. (file state is current in your context — no need to Read it back)


**Step 5: Run all tests with race detector**


Bash

cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test -race ./cmd/... -v 2>&1

Run all cmd tests with race detector


=== RUN   TestDiffPlainOutput
--- PASS: TestDiffPlainOutput (0.02s)
=== RUN   TestDiffIdenticalVersionsNoChanges
--- PASS: TestDiffIdenticalVersionsNoChanges (0.01s)
=== RUN   TestDiffBadModuleAddress
--- PASS: TestDiffBadModuleAddress (0.00s)
=== RUN   TestDiffJSONOutput
--- PASS: TestDiffJSONOutput (0.01s)
=== RUN   TestDiffSemanticIncluded
--- PASS: TestDiffSemanticIncluded (0.01s)
=== RUN   TestDiffAddsToKnownAfterSuccess
--- PASS: TestDiffAddsToKnownAfterSuccess (0.01s)
=== RUN   TestDiffDoesNotAddOnFailure
--- PASS: TestDiffDoesNotAddOnFailure (0.00s)
=== RUN   TestDiffValidArgsFunctionLoadsCache
Completion ended with directive: ShellCompDirectiveNoFileComp
--- PASS: TestDiffValidArgsFunctionLoadsCache (0.00s)
=== RUN   TestExitCode
=== RUN   TestExitCode/nil
=== RUN   TestExitCode/not-found
=== RUN   TestExitCode/wrapped-not-found
=== RUN   TestExitCode/context-cancelled
=== RUN   TestExitCode/context-deadline
=== RUN   TestExitCode/generic
--- PASS: TestExitCode (0.00s)
    --- PASS: TestExitCode/nil (0.00s)
    --- PASS: TestExitCode/not-found (0.00s)
    --- PASS: TestExitCode/wrapped-not-found (0.00s)
    --- PASS: TestExitCode/context-cancelled (0.00s)
    --- PASS: TestExitCode/context-deadline (0.00s)
    --- PASS: TestExitCode/generic (0.00s)
=== RUN   TestNewRootCmdHelp
--- PASS: TestNewRootCmdHelp (0.00s)
=== RUN   TestNewRootCmdDefaults
--- PASS: TestNewRootCmdDefaults (0.00s)
=== RUN   TestNewRootCmdRespectsCrowURLEnv
--- PASS: TestNewRootCmdRespectsCrowURLEnv (0.00s)
=== RUN   TestVersionsCmd
--- PASS: TestVersionsCmd (0.00s)
=== RUN   TestVersionsValidArgsFunctionLoadsCache
Completion ended with directive: ShellCompDirectiveNoFileComp
--- PASS: TestVersionsValidArgsFunctionLoadsCache (0.00s)
=== RUN   TestVersionsDoesNotAddToKnown
--- PASS: TestVersionsDoesNotAddToKnown (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/cmd	5.437s


All 17 tests pass (including all 3 new ones) with the race detector clean. Now verify the build.

**Step 6: Verify build**


cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go vet ./... && go build ./... 2>&1

Vet and build the birdseye module


(Bash completed with no output)


Clean. **Step 7: Commit**


git add apps/birdseye/cmd/ && git commit -m "feat(birdseye): shell completion for diff and versions from known-modules cache"

Commit Task 4 changes


[worktree-birdseye 4d747fc] feat(birdseye): shell completion for diff and versions from known-modules cache
 4 files changed, 87 insertions(+), 1 deletion(-)


---

**Status:** DONE

**Files modified:**
- `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/diff.go` — Added `ValidArgsFunction` just before `return c` in `newDiffCmd`
- `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/versions.go` — Replaced function body with flagged version including `--known-modules-file` flag, `ValidArgsFunction`, and `known` import
- `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/diff_test.go` — Added `TestDiffValidArgsFunctionLoadsCache`
- `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/cmd/versions_test.go` — Added `os`/`path/filepath` imports, `TestVersionsValidArgsFunctionLoadsCache`, and `TestVersionsDoesNotAddToKnown`

**Test count:** 17 total (3 new), all pass under `-race`

**Commit SHA:** `4d747fc`

**Nothing unexpected.** The `versions` command correctly reads the cache via `Load` in its `ValidArgsFunction` but never calls `known.Add`, satisfying the intentional asymmetry. Both subcommands return `ShellCompDirectiveNoFileComp` to suppress filename fallback, and the `if len(args) > 0` guard restricts suggestions to the first positional argument only.