preset: the window opens on a preset that was chosen, and a joint limit stops printing one number twice by donislawdev · Pull Request #121 · donislawdev/TestingFilesGenerator

donislawdev · 2026-09-22T13:45:13Z

Two things in one branch, both asked for after #120.

Stacked on preset/first-four so the diff here is only this work. Once
#120 is squash-merged I rebase this onto main and retarget it.

1. The window opens on a preset that was chosen, not sorted

Both screens started on the first preset id in order, which is alphabetical. So
what somebody sees when they open the Presets tab was decided by whoever writes
a preset next - and it changed the day empty-and-minimal arrived, taking nine
window guards red with it, none of them reporting anything more useful than a
field being nil. The catalogue in PRESETS.md has fourteen entries.

A preset declares it now. Exactly one does, and a second is a panic at
registration the way two presets of one id are.

empty-and-minimal is the one, and the reason is a number:

	`size-boundaries`	`empty-and-minimal`
first press of Generate, untouched	73 400 320 B	32 214 B
does the set mean anything without input	no - the run says out loud that its `10mb` is our placeholder and not the limit of the system under test	yes

Nobody's first result should be seventy megabytes.

2. O232: a joint limit that printed the request and the limit as one number

Measured, and worse than the observation recorded:

request	before	after
`png 20000x2001` (40.02 Mpx)	`come to 40 megapixels and the limit is 40`	`come to 40 020 000 pixels and the limit is 40 000 000 pixels`
`xlsx 200000x11` (2.2 M cells)	`come to 2 million cells and the limit is 2`	`come to 2 200 000 cells and the limit is 2 000 000 cells`
`png 20000x20000` (400 Mpx)	`come to 400 megapixels and the limit is 40`	`come to 400 megapixels and the limit is 40 megapixels`

Two defects in one sentence: the counts were divided by a million and the
division truncates, so a request just over the limit printed as the limit; and
the limit carried no unit. Six declarations were affected, not just xlsx.

The readable form is kept where it still distinguishes the two counts, because
"400 megapixels and the limit is 40 megapixels" is a sentence somebody can act
on. Where it would put both on one number the exact counts are written instead,
spaced every three digits the way ExactBytes always has.

Rejected: printing exactly always - the comment above JointLimit turns
that down with reason. Rejected: more decimal places - 40 000 001 against
40 000 000 collides at every fixed number of them.

Guards

Four new, six mutations, all caught. Two are worth calling out:

TestNoJointLimitRefusalPrintsTheRequestAndTheLimitAsOneNumber reads the two
numbers out of the sentence rather than recomputing them. One comparing
the numbers the rule holds would agree with the rule and say nothing about the
words it chose. Three requests per rule, and the middle one is one unit over
the limit - exactly where the rounding hid the difference.
TestBothScreensOpenOnTheDeclaredPreset asks the screens, not
preset.Landing. The declaration being right says nothing about whether a
screen went through it, and the two screens reached for the first id
separately.

One mutation came back NOT CAUGHT first time and it was telling the truth
about the guard rather than the code: taking the unit off the limit left the
declaration-checking guard green, because a declaration with a Base can still
be printed without one. The sentence-reading guard pulls the word after each
count now.

What this does not touch

Whether the window should remember the last preset instead of opening on the
declared one. It already remembers its size and directory, so the mechanism
exists - but that is a separate decision about whether the program returns to
where you left off or starts from the same place.

🤖 Generated with Claude Code

Summary by CodeRabbit

New Features
- The GUI and batch workflows now open with the empty-and-minimal preset by default, producing 26 files totaling 32,214 B.
- Dimension and cell-count limit messages now show clear units and exact pixel or cell counts when rounded megapixel values could be ambiguous.
Documentation
- Updated the unreleased changelog to document the new default preset and improved limit-message formatting.

coderabbitai · 2026-09-22T13:45:35Z

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Walkthrough

The PR adds explicit landing-preset selection for the GUI and batch workflow. It also adds exact unit-aware formatting for ambiguous joint-limit refusals across image and spreadsheet formats.

Changes

Landing preset selection

Layer / File(s)	Summary
Landing preset registration and screen initialization `internal/preset/...`, `internal/gui/window/...`, `internal/guard/landing_test.go`, `CHANGELOG.md`	`Preset` can declare one landing preset. The registry exposes `Landing()`, `empty-and-minimal` declares the role, and both screens initialize from it. Guard tests verify registration and screen selection.

Exact joint-limit refusal messages

Layer / File(s)	Summary
Joint-limit units and exact formatting `internal/core/humanise.go`, `internal/format/format.go`, `internal/format/{avif,gif,jpg,jxl,png,xlsx}/*.go`	`JointLimit` includes a base unit. Limit declarations specify pixel or cell bases. `Allows` uses exact grouped counts when rounded values would match.
Joint-limit refusal validation and documentation `internal/guard/jointlimit_test.go`, `CHANGELOG.md`	Guard tests inspect every registered joint limit, required metadata, units, and distinct requested and allowed counts. The changelog documents the formatting behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Application
  participant PresetRegistry
  participant PresetsScreen
  participant BatchScreen
  Application->>PresetRegistry: request Landing()
  PresetRegistry-->>Application: return declared preset ID
  Application->>PresetsScreen: set initial preset
  Application->>BatchScreen: set initial base preset

Suggested labels: bug, ui

Merge Risk: 🔵 Low · up to d925f

The declared default currently works, but its regression test does not prove that declared selection rather than alphabetical ordering drives either screen. Make the fixture distinguish those choices.

🚥 Pre-merge checks | ✅ 14

✅ Passed checks (14 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes both user-visible changes: selecting a chosen default preset at startup and preventing joint-limit refusals from repeating one count. It is specific, related to the changes…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Tests For Changed Behavior	✅ Passed	The PR adds tests for its changed behavior. `internal/guard/jointlimit_test.go` exercises every registered `JointLimit`, checks distinct requested and allowed values, matching units, and required decl…
No Secrets Or Debug Leftovers	✅ Passed	The pull-request diff adds no CLAUDE.md, CLAUDE.local.md, AGENTS.md, .claude/, or .env paths. Scans of all 399 added lines found no credentials, tokens, API keys, private URLs, absolute local paths, I…
No Hardcoded Ui Styling	✅ Passed	The PR changes Fyne GUI code in `internal/gui/window/preset.go` and `internal/gui/window/recipebase.go`, but only changes preset selection to use `preset.Landing()`. It does not add or modify colors, …
No Obvious Performance Problems	✅ Passed	No clear performance problem is introduced. `JointLimit.Allows` adds only constant-size arithmetic and string formatting on the refusal path. `preset.Landing` returns a cached ID in the normal registe…
Desktop Robustness	✅ Passed	The reviewed diff only changes preset selection, preset registration, and joint-limit text formatting, plus tests and changelog text. The changed GUI code selects a preset and refreshes fields; it doe…
Safe File Parsing	✅ Passed	PASS: The PR does not add or change file parsing, importing, or exporting logic. The implementation changes only preset selection, registry state, numeric formatting, and joint-limit messages. The add…
System Changes Are Reversible	✅ Passed	The pull request does not add or change system-state controls covered by this check. The production changes only format joint-limit messages, select an in-memory preset for GUI screens, and track an i…
Clear User-Facing Text	✅ Passed	PASS: The PR changes joint-limit refusal text, but the resulting messages identify the rejected value, the requested and allowed counts, matching units, and the reason. The format-specific callers als…
No Resource Leaks	✅ Passed	No resource leak is introduced. The changed production code adds only preset metadata/registry state, formatting logic, and initial chooser selection; it adds no handlers, timers, goroutines, files, s…
Scope, Duplication And Docs	✅ Passed	The PR scope matches the title and description: it adds declared preset landing selection and fixes joint-limit refusal wording, with the required registry/UI wiring, shared number-formatting helper, …

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Inline comments:
In `@internal/guard/landing_test.go`:
- Line 64: Update the landing screen test around want and preset.Landing() to
use a landing preset whose ID sorts after another available preset, so the
assertion distinguishes declared landing selection from ids[0] alphabetical
selection. Ensure the test fails if the implementation reverts to selecting the
first sorted preset.

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📥 Commits

Reviewing files that changed from the base of the PR and between ac90838 and d925fb5.

📒 Files selected for processing (15)

CHANGELOG.md
internal/core/humanise.go
internal/format/avif/avif.go
internal/format/format.go
internal/format/gif/gif.go
internal/format/jpg/jpg.go
internal/format/jxl/jxl.go
internal/format/png/png.go
internal/format/xlsx/xlsx.go
internal/guard/jointlimit_test.go
internal/guard/landing_test.go
internal/gui/window/preset.go
internal/gui/window/recipebase.go
internal/preset/emptyandminimal.go
internal/preset/preset.go

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