# Plan: Root Makefile

## Context

The project has grown to a multi-step Go implementation with a test suite, and a
Python port is planned. Common workflows (build, test, vet, coverage) are
currently typed by hand with `cd go && go ...`. A root `Makefile` gives a single,
discoverable entry point for these tasks and a place to hang the future Python
targets.

Decisions confirmed with the user:
- Include **all** proposed targets: core set + `cover` + `tidy`/`install` + `lint`.
- **Namespaced** naming (`go-build`, `go-test`, …) with umbrella targets
  (`build`, `test`, …) that delegate to the language-specific ones, so `py-*`
  can slot in cleanly during the Python port.

Environment: GNU Make 3.81, Go 1.26.4, `golangci-lint` installed. Go commands use
`go -C go …` (Go 1.20+ directory flag) to avoid `cd`.

## File: `Makefile` (repo root)

Variables:
```make
GO_DIR  := go
BINARY  := latprobe
ARGS    ?=
.DEFAULT_GOAL := help
```

### Umbrella targets (delegate now to Go; Python added later)
| Target | Delegates to | Notes |
|--------|--------------|-------|
| `help` | — | Default. Auto-generated from `##` comments. |
| `build` | `go-build` | `py-build` appended during Python port |
| `test` | `go-test` | `py-test` appended later |
| `check` | `go-check` | fmt + vet + test gate |
| `fmt` | `go-fmt` | |
| `vet` | `go-vet` | |
| `clean` | `go-clean` | |
| `all` | `check build` | |

A comment marks where `py-*` will be added (e.g. `test: go-test  # + py-test later`).

### Go targets
| Target | Command |
|--------|---------|
| `go-build` | `go -C $(GO_DIR) build -o $(BINARY) .` |
| `go-run` | `go -C $(GO_DIR) run . $(ARGS)` |
| `go-test` | `go -C $(GO_DIR) test ./...` |
| `go-test-verbose` | `go -C $(GO_DIR) test -v ./...` |
| `go-fmt` | `gofmt -w $(GO_DIR)` |
| `go-vet` | `go -C $(GO_DIR) vet ./...` |
| `go-check` | depends on `go-fmt go-vet go-test` |
| `go-cover` | `go -C $(GO_DIR) test -coverprofile=coverage.out ./...` then `go -C $(GO_DIR) tool cover -html=coverage.out -o coverage.html` |
| `go-tidy` | `go -C $(GO_DIR) mod tidy` |
| `go-install` | `go -C $(GO_DIR) install .` |
| `go-lint` | guard for `golangci-lint` presence, then `cd $(GO_DIR) && golangci-lint run` |
| `go-clean` | `rm -f $(GO_DIR)/$(BINARY) $(GO_DIR)/coverage.out $(GO_DIR)/coverage.html` |

Details:
- `make run ARGS="https://example.com -n 3"` passes flags through.
- All targets listed in `.PHONY`.
- `help` recipe: `grep`/`awk` over `$(MAKEFILE_LIST)` printing `target ## description`
  (works on GNU Make 3.81).
- `go-lint` guard:
  ```make
  @command -v golangci-lint >/dev/null 2>&1 || { echo "golangci-lint not installed: https://golangci-lint.run"; exit 1; }
  ```

## Other changes
- `.gitignore`: add `go/coverage.out` and `go/coverage.html`.
- `docs/usage/makefile.md`: new user doc — target table + examples.
- `CHANGELOG.md`: timestamped entry.
- `README.md`: short "Development" note pointing at `make help`.
- `docs/plans/2026-07-01-01-05-makefile.md`: copy of this plan.

## Verification
```sh
make help            # lists all targets with descriptions
make build           # produces go/latprobe
make run ARGS="https://example.com"
make test            # go test ./...
make go-test-verbose # per-test PASS/FAIL output
make check           # fmt + vet + test
make go-cover        # writes go/coverage.html
make go-lint         # runs golangci-lint (installed)
make clean           # removes binary + coverage artifacts
```
Confirm `make` with no args shows help, and that `clean` leaves the tree as
`git status` clean (no tracked files removed).