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tiennm99
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Seven canonical docs under docs/ per the project structure convention: - project-overview-pdr.md users, non-goals, requirements - codebase-summary.md directory layout, module responsibilities - system-architecture.md runtime phases, GraphQL flow, SVG primitives - code-standards.md YAGNI/KISS/DRY, Go conventions, commit rules - design-guidelines.md frame dimensions, theme roles, per-card specs - deployment-guide.md Action/binary/Docker paths, release process - project-roadmap.md done phases (0-5), planned phases (6-9) All files under the 800-line cap. Each leans on tables; grammar sacrificed for concision per project rules.
92 lines
3.8 KiB
Markdown
92 lines
3.8 KiB
Markdown
# Code Standards
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## Principles
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Applied in order: **YAGNI → KISS → DRY**.
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- No feature flags, no plugin systems, no abstractions for hypothetical callers.
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- One way to do a thing. A helper emerges only after the second call site, never before.
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- Three similar lines beats a premature abstraction. Extract when a fourth arrives.
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## Go conventions
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### File naming
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- Multi-word files use `snake_case` (Go ecosystem standard): `repos_per_language.go`, `contributions_all_time.go`.
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- Single-word files stay single-word: `client.go`, `model.go`, `profile.go`.
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- Test files adjacent to the unit under test with `_test.go` suffix.
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### Package structure
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- `main.go` at repo root — the CLI wrapper only.
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- All reusable code under `internal/` so it can't accidentally become an API.
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- Each package owns one concern: `github` = network, `card` = render, `theme` = palette data.
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### Error handling
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- Wrap errors with `fmt.Errorf("%w: …", err)` when adding context; bare return when the caller already has enough context.
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- Sentinel errors (`errors.New`) only when callers need to type-check. We have none today — don't invent them.
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- Network/API errors in fetchers bubble up; `main.go` decides whether to exit or warn.
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### No hidden state
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- Profile fetchers mutate the `*Profile` argument in-place (`FetchContributionsAllTime(p, opts)`) — explicit ownership, no package-level caches.
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- Renderers are pure functions of `(*Profile, theme.Theme)`. No side effects, no goroutines.
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### Comments
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Default: **no comments**. Exceptions:
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- **Why non-obvious code is non-obvious.** Example: the `scaleFactor = 10_000` constant — a comment explains why fixed-point and not float.
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- **Hidden invariant or constraint.** Example: the comment on `contributionYearQuery` noting the `maxRepositories: 100` cap.
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- **Workaround for an upstream behavior.** Example: clamping the current year's `to` to `now` so GitHub doesn't reject future timestamps.
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Never write comments that describe what well-named code does (`// increment counter`). Never reference "the recent fix" or "for issue #42" — that belongs in git.
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### Function length
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- No hard limit. 200-line functions are fine when the logic is linear.
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- Extract a helper only when (a) the same shape repeats twice, or (b) a block needs an independent name to be read at the call site.
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### Exported vs unexported
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- Start unexported. Export only when a test file or another package needs the symbol.
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- Types on the public API: `Profile`, `RepoInfo`, `LangStat`, `LangEdge`, `DailyContribution`, `FetchOptions`, `Client`, `Theme`, `Card`.
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- Everything else stays lowercase.
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## SVG output standards
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- Always XML-escape user-controlled strings through `escapeXML` (`&`, `<`, `>`, `"`, `'`).
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- Numbers formatted via `formatInt` with thousands separators.
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- Stable viewbox per card (`500×220` for most, `500×220` for profile too).
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- No `<script>` tags, no event handlers. Cards are pure markup.
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## Testing
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- Unit tests in the same package, no mocking of http.Client — we test rendering and pure helpers.
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- Network tests are omitted; integration verification is manual (`./ghstats -token ...`).
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- `go vet ./...` clean before every commit.
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## Commit conventions
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- Conventional commit prefixes: `feat:`, `fix:`, `refactor:`, `docs:`, `test:`, `build:`, `ci:`, `chore:`.
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- Scope is optional: `refactor(card): …`.
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- Never use `chore:` or `docs:` for `.claude/` directory changes (project rule).
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- No AI references. No "generated by" footers. Keep the subject ≤ 72 chars.
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## Pre-commit checklist
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```
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go vet ./...
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go test ./...
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go build ./...
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```
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All three must pass. If a test is failing, fix the test before committing — don't skip.
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## Dependency policy
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- **Stdlib only.** `go.mod` lists no `require` entries.
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- If a future feature needs a third-party module, add it in a dedicated commit with justification in the message.
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- Keep binary size under 15 MB.
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