interpres/docs/DEVELOPMENT.md

Development

How to work on interpres.

Prerequisites

• Go 1.27.1, the version the go directive in go.mod declares.
• just for the recipes.
• The toml-test binary on PATH for the compliance recipe, installed with go install github.com/toml-lang/toml-test/v2/cmd/toml-test@v2.2.0.

The module has no third-party dependencies, so there is nothing else to fetch.

Setup

git clone https://sourcedock.dev/petrbalvin/interpres.git
cd interpres
just build
just test

Recipes

Every recipe in the project's justfile, and what it does. Taken from the file itself, so the names and the list match it exactly; just with no arguments prints the same list.

Recipe	What it does
just gates	the definition of done: build, format check, vet, the test suite with the coverage floor, and the race detector
just build	compiles ./cmd/interpres-decode into bin/interpres-decode
just test	the suite with no cache, then the coverage floor of 80 percent from coverage.out
just race	the same suite under the race detector
just unit ./... TestName	a fast scoped run for iterating; the second argument is a -run pattern, .* by default
just fuzz FuzzParse . 30s	time-boxed fuzzing of one target in exactly one package; go test -fuzz rejects ./...; never a gate
just bench	benchmarks, -benchmem -count=5, on an idle machine only
just fmt	gofmt -w ., format in place
just fmt-check	gofmt -l ., zero diff
just vet	go vet ./... and go fix -diff ./...
just run	go run ./cmd/interpres-decode, reads TOML from stdin
just dev	the same run, for iterating
just example	go run ./examples/basic, the usage tour
just toml-test	builds the adapter and runs the official toml-test compliance suite against it, decoder and encoder
just coverage-html	just test, then go tool cover -html into coverage.html
just install	builds, then copies the binary into ~/.local/bin (BINDIR overrides)
just uninstall	removes the installed binary
just clean	removes bin/ and coverage.out

Running a single test

just unit ./... TestParseMultilineString
go test -run 'TestRejectsSpecInvalid/table_over_array' ./...
go test ./cmd/interpres-decode/

Add -v for the sub-test names, and -race when the change touches concurrency. -count=1 defeats the test cache when a result looks stale.

Coverage

just test
go tool cover -func=coverage.out
just coverage-html

just test prints the total itself and fails below 80 percent, which is the same floor CI enforces. The profile is coverage.out; the HTML map is coverage.html. Both are ignored by git.

Benchmarks

just bench

Benchmark on an idle machine, and compare only runs made in one process against each other. The recipe sweeps ./... five times with -benchmem. The binding measurement method, and what counts as a result, is in docs/BENCHMARKING.md.

Debugging the build

go build -gcflags='-m' ./...   # inlining decisions
go build -gcflags='-S' ./...   # what the compiler generated

Continuous integration

Workflows live in .gitea/workflows/ and run on the project's own runners. They are written by hand rather than through just, but they enforce the same set of gates, so a green just gates locally is the fastest way to a green pipeline.

Workflow	Trigger	What it does
test.yml	push or pull request to development	format check, vet, modernisation, build, the test suite with the 80 percent coverage floor, then the toml-test compliance suite
race.yml	workflow_dispatch, by hand	the suite under the race detector; the same race gate just gates runs locally
release.yml	a v* tag	tag validation, then format, vet, modernisation, build and the test suite with the coverage floor, then the Gitea release from the CHANGELOG section. No race detector: race never runs on a push path, and the local just gates raced the tree before the tag was cut

Releases

Releases are cut by merging development into main and tagging vX.Y.Z. The tag drives the release workflow: it validates the tag, runs the static gates and the test suite with the coverage floor, extracts the matching ## [X.Y.Z] section from CHANGELOG.md, and publishes the release with that section as its body. A library ships no binaries, so the release carries the notes and nothing else.