feat: add FileWriter service and refactor waza init inventory #48 by wbreza · Pull Request #63 · microsoft/waza

wbreza · 2026-03-04T22:44:39Z

Closes #48

What changed

Created internal/scaffold/writer.go with FileWriter service
Create-if-missing / skip-if-exists with structured inventory
Always-visible inventory output (not gated behind --verbose)
Refactored cmd_init.go to use FileWriter (replaced ~65 lines of inline loop)
Inventory symbols: ➕ created, ✅ exists

Testing

8 new writer tests (create, skip, inventory, directory creation)
All 20 existing init tests pass
go test ./... green

- Create internal/scaffold/writer.go with FileWriter type that encapsulates the create-if-missing + skip-if-exists pattern - FileWriter returns structured Inventory with per-entry outcomes (created/skipped) - Inventory.Fprint() renders aligned table with emoji indicators: ➕ for created, ✅ (already exists) for skipped - Refactor cmd/waza/cmd_init.go to use FileWriter instead of inline write loop - Inventory is always visible (not gated behind --verbose) - Add 8 tests in writer_test.go covering: create-if-missing, skip-if-exists, mixed outcomes, parent directory creation, inventory output, relative paths, empty content handling, and CreatedCount Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

This PR introduces a reusable scaffolding writer service to standardize waza init’s create-if-missing / skip-if-exists behavior and to make the “project structure” inventory consistently visible and testable.

Changes:

Added internal/scaffold/FileWriter with structured Inventory output (➕ created, ✅ exists).
Refactored cmd/waza/cmd_init.go Phase 5 to use FileWriter instead of an inline write loop.
Added unit tests covering create/skip behavior, inventory output formatting, and parent directory creation.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal/scaffold/writer.go	New `FileWriter` + `Inventory` implementation for safe, repeatable scaffolding.
internal/scaffold/writer_test.go	New tests validating writer behavior and inventory output.
cmd/waza/cmd_init.go	Replaces inline scaffolding loop with `FileWriter` and uses `Inventory` for summary/output.
.squad/agents/linus/history.md	Documents the #48 refactor work for team history.

Comments suppressed due to low confidence (1)

internal/scaffold/writer.go:113

In the directory branch, any os.Stat error (including permission errors) falls through to MkdirAll. This can mask the real cause and can attempt a write in a path that exists but is inaccessible. Consider handling stat errors explicitly (skip only when err==nil && info.IsDir(); create only when os.IsNotExist(err); otherwise return an error that wraps the original stat failure).

		if entry.IsDir {
			if info, err := os.Stat(entry.Path); err == nil && info.IsDir() {
				item.Outcome = OutcomeSkipped
			} else {
				if err := os.MkdirAll(entry.Path, 0o755); err != nil {
					return nil, fmt.Errorf("failed to create %s: %w", entry.Path, err)
				}
				item.Outcome = OutcomeCreated
			}

* feat: refactor waza new to use shared FileWriter #58 Replace the inline write loop in cmd_new.go with the shared FileWriter from internal/scaffold/writer.go. Malformed SKILL.md detection still runs before FileWriter — the file is removed so FileWriter creates it fresh. Inventory now uses consistent ➕/✅ emoji indicators (always visible, not gated behind --verbose), matching the waza init behavior. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * chore: update squad state for #58 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

wbreza

Architectural review: FileWriter extraction + always-visible inventory is the right direction, and the cmd_init complexity reduction is meaningful. Blocking issue: cmd_new.go currently does '_ = os.Remove(...)' in malformed SKILL.md repair paths; if remove fails (permissions/readonly), FileWriter will mark SKILL.md as ✅ skipped and the malformed file is left unrepaired. Fix: handle remove errors explicitly (ignore only IsNotExist, return all other errors) and add a regression test for remove/write error propagation in overwrite-repair flow.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Directory branch: explicitly handle IsNotExist vs other stat errors - File branch: detect directory-at-file-path type mismatch - Both branches: return errors on permission failures instead of masking - Add regression tests for type-mismatch error paths Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Directory branch: explicitly handle IsNotExist vs other stat errors - Directory branch: error when path exists but is not a directory - File branch: detect directory-at-file-path type mismatch - Both branches: return errors on permission failures instead of masking - Add regression tests for type-mismatch error paths Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

wbreza · 2026-03-04T23:21:35Z

Addressing review feedback (d8d7630):

Rusty, Copilot — both stat-handling issues are fixed in the FileWriter:

Directory branch: Now uses three-way dispatch: \�rr == nil && IsDir()\ → skip, \�rr == nil && !IsDir()\ → error (type mismatch), \os.IsNotExist\ → create, otherwise → return the stat error (catches permission errors).

File branch: Now checks \info.IsDir()\ when stat succeeds (errors if a directory sits where a file should be), and returns stat errors that aren't \IsNotExist\ instead of masking them.

New regression tests: \TestFileWriter_DirEntry_FileExistsAtPath\ and \TestFileWriter_FileEntry_DirExistsAtPath\ cover both type-mismatch paths.

Re: SKILL.md repair in cmd_new.go — agreed that's on the #58 branch scope, not this PR. The FileWriter now properly surfaces all stat/permission errors, so downstream consumers like cmd_new.go will get proper error propagation.

All scaffold tests pass (9/9). — Linus

Copilot

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Comments suppressed due to low confidence (3)

internal/scaffold/writer.go:117

For file entries, if the path exists but is a directory, Write() currently marks it as OutcomeSkipped. That leaves the project in a broken state (required file missing) without surfacing an error. Consider checking the file type and returning a clear error when an unexpected directory exists at a file path.

				}
				item.Outcome = OutcomeCreated
			} else {
				return nil, fmt.Errorf("failed to stat %s: %w", entry.Path, err)

cmd/waza/cmd_new_test.go:165

Same issue here: "✅" is also present in the summary footer, so this assertion can pass even if no inventory entry was skipped. Prefer asserting the skipped-line suffix ("already exists") and/or the specific file path/label.

	require.NoError(t, err)
	assert.Equal(t, validSkillMD, string(data), "existing SKILL.md should not be overwritten")

	// Output should mention ✅ for skipped file
	assert.Contains(t, buf.String(), "✅")

cmd/waza/cmd_new_test.go:197

This assertion checks for "✅", but that string will always appear in the footer (e.g. "✅ Project up to date.") even if the inventory formatting regresses. Consider asserting for the per-item skipped marker plus "(already exists)" to ensure the inventory output is validated.

	output := buf.String()
	assert.Contains(t, output, "✅")
	assert.Contains(t, output, "Project up to date")
}

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…ft#48 (microsoft#63) * feat: add FileWriter service and refactor waza init inventory microsoft#48 - Create internal/scaffold/writer.go with FileWriter type that encapsulates the create-if-missing + skip-if-exists pattern - FileWriter returns structured Inventory with per-entry outcomes (created/skipped) - Inventory.Fprint() renders aligned table with emoji indicators: ➕ for created, ✅ (already exists) for skipped - Refactor cmd/waza/cmd_init.go to use FileWriter instead of inline write loop - Inventory is always visible (not gated behind --verbose) - Add 8 tests in writer_test.go covering: create-if-missing, skip-if-exists, mixed outcomes, parent directory creation, inventory output, relative paths, empty content handling, and CreatedCount Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * docs: update Linus history with FileWriter work (microsoft#48) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * feat: refactor waza new to use shared FileWriter microsoft#58 (microsoft#66) * feat: refactor waza new to use shared FileWriter microsoft#58 Replace the inline write loop in cmd_new.go with the shared FileWriter from internal/scaffold/writer.go. Malformed SKILL.md detection still runs before FileWriter — the file is removed so FileWriter creates it fresh. Inventory now uses consistent ➕/✅ emoji indicators (always visible, not gated behind --verbose), matching the waza init behavior. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * chore: update squad state for microsoft#58 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * chore: remove .squad/ files from PR branch Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * chore: remove .squad/ files from PR branch Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: improve error handling in FileWriter stat checks microsoft#48 - Directory branch: explicitly handle IsNotExist vs other stat errors - File branch: detect directory-at-file-path type mismatch - Both branches: return errors on permission failures instead of masking - Add regression tests for type-mismatch error paths Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: improve error handling in FileWriter stat checks microsoft#48 - Directory branch: explicitly handle IsNotExist vs other stat errors - File branch: detect directory-at-file-path type mismatch - Both branches: return errors on permission failures instead of masking - Add regression tests for type-mismatch error paths Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: improve error handling in FileWriter stat checks microsoft#48 - Directory branch: explicitly handle IsNotExist vs other stat errors - Directory branch: error when path exists but is not a directory - File branch: detect directory-at-file-path type mismatch - Both branches: return errors on permission failures instead of masking - Add regression tests for type-mismatch error paths Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: gofmt writer_test.go Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

wbreza and others added 2 commits March 4, 2026 14:31

docs: update Linus history with FileWriter work (#48)

dcc3558

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

wbreza requested review from chlowell, richardpark-msft and spboyer as code owners March 4, 2026 22:44

Copilot AI review requested due to automatic review settings March 4, 2026 22:44

github-actions Bot enabled auto-merge (squash) March 4, 2026 22:44

Copilot started reviewing on behalf of wbreza March 4, 2026 22:46 View session

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wbreza commented Mar 4, 2026

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spboyer mentioned this pull request Mar 4, 2026

feat: add FileWriter for safe scaffold file creation #61

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wbreza and others added 5 commits March 4, 2026 15:15

Merge branch 'main' into squad/48-filewriter-init-inventory

edecc0d

chore: remove .squad/ files from PR branch

8981a87

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

chore: remove .squad/ files from PR branch

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI review requested due to automatic review settings March 4, 2026 23:17

Copilot started reviewing on behalf of wbreza March 4, 2026 23:18 View session

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Comment thread internal/scaffold/writer.go

Comment thread internal/scaffold/writer.go

Comment thread cmd/waza/cmd_new_test.go

Comment thread internal/scaffold/writer.go

fix: gofmt writer_test.go

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

spboyer approved these changes Mar 5, 2026

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github-actions Bot merged commit e89407b into main Mar 5, 2026
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spboyer mentioned this pull request Mar 12, 2026

Release v0.21.0 #122

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spboyer mentioned this pull request Apr 22, 2026

Review init code, make sure we always prompt if data needs to be overwritten #48

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spboyer mentioned this pull request Feb 28, 2026

🎯 Waza Platform Roadmap - Tracking Issue #8

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feat: add FileWriter service and refactor waza init inventory #48#63

feat: add FileWriter service and refactor waza init inventory #48#63
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wbreza commented Mar 4, 2026

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