Makefile: Be clear about exactly which files are generated, and how

This mostly aims to document how everything was generated, and the steps
necessary to re-generate the same files verbatim; the goal is to figure
out how to reproduce the files as they currently are.  The exception is
that we strip out the timestamp out of install.sh.

.gitignore

@@ -5,3 +5,4 @@
 /.idea/
 /test/path
 /golangci-lint
+/tools/

Makefile

@@ -1,5 +1,17 @@
+.DEFAULT_GOAL = test
+.PHONY: FORCE
 export GO111MODULE = on
 
+# Build
+
+build: golangci-lint
+clean:
+	rm -f golangci-lint test/path
+	rm -rf tools
+.PHONY: build clean
+
+# Test
+
 test: build
 	GL_TEST_RUN=1 ./golangci-lint run -v
 	GL_TEST_RUN=1 ./golangci-lint run --fast --no-config -v --skip-dirs 'test/testdata_etc,pkg/golinters/goanalysis/(checker|passes)'
@@ -8,35 +20,81 @@ test: build
 
 build:
 	go build -o golangci-lint ./cmd/golangci-lint
+.PHONY: test
 
 test_race:
 	go build -race -o golangci-lint ./cmd/golangci-lint
 	GL_TEST_RUN=1 ./golangci-lint run -v --deadline=5m
+.PHONY: test_race
 
 test_linters:
 	GL_TEST_RUN=1 go test -v ./test -count 1 -run TestSourcesFromTestdataWithIssuesDir/$T
+.PHONY: test_linters
 
-assets:
-	svg-term --cast=183662 --out docs/demo.svg --window --width 110 --height 30 --from 2000 --to 20000 --profile Dracula --term iterm2
+# Maintenance
 
-readme:
-	go run ./scripts/gen_readme/main.go
-
-gen:
-	go generate ./...
+generate: docs/demo.svg README.md install.sh pkg/logutils/log_mock.go vendor
+maintainer-clean: clean
+	rm -f docs/demo.svg README.md install.sh pkg/logutils/log_mock.go
+	rm -rf vendor
+.PHONY: generate maintainer-clean
 
 check_generated:
-	$(MAKE) readme update_deps
+	$(MAKE) --always-make generate
 	git diff --exit-code # check no changes
+.PHONY: check_generated
 
 release:
 	rm -rf dist
 	curl -sL https://git.io/goreleaser | bash
+.PHONY: release
 
-update_deps:
+# Non-PHONY targets (real files)
+
+golangci-lint: FORCE pkg/logutils/log_mock.go
+	go build -o $@ ./cmd/golangci-lint
+
+tools/mockgen: go.mod go.sum
+	GOBIN=$(CURDIR)/tools go install github.com/golang/mock/mockgen
+
+tools/goimports: go.mod go.sum
+	GOBIN=$(CURDIR)/tools go install golang.org/x/tools/cmd/goimports
+
+tools/go.mod:
+	@mkdir -p tools
+	@rm -f $@
+	cd tools && go mod init local-tools
+
+tools/godownloader: Makefile tools/go.mod
+	cd tools && GOBIN=$(CURDIR)/tools go get github.com/goreleaser/godownloader@3b90d248ba30307915288f08ab3f2fc2d9f6710c
+
+tools/svg-term:
+	@mkdir -p tools
+	cd tools && npm install svg-term-cli
+	ln -sf node_modules/.bin/svg-term $@
+
+tools/Dracula.itermcolors:
+	@mkdir -p tools
+	curl -fL -o $@ https://raw.githubusercontent.com/dracula/iterm/master/Dracula.itermcolors
+
+docs/demo.svg: tools/svg-term tools/Dracula.itermcolors
+	PATH=$(CURDIR)/tools:$${PATH} svg-term --cast=183662 --out docs/demo.svg --window --width 110 --height 30 --from 2000 --to 20000 --profile ./tools/Dracula.itermcolors --term iterm2
+
+install.sh: tools/godownloader .goreleaser.yml
+	PATH=$(CURDIR)/tools:$${PATH} tools/godownloader .goreleaser.yml | sed '/DO NOT EDIT/s/ on [0-9TZ:-]*//' > $@
+
+README.md: FORCE golangci-lint
+	go run ./scripts/gen_readme/main.go
+
+pkg/logutils/log_mock.go: tools/mockgen tools/goimports pkg/logutils/log.go
+	@rm -f $@
+	PATH=$(CURDIR)/tools:$${PATH} go generate ./...
+
+go.mod: FORCE
 	go mod verify
 	go mod tidy
+go.sum: go.mod
+
+vendor: go.mod go.sum
 	rm -rf vendor
 	go mod vendor
-
-.PHONY: test

install.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -e
-# Code generated by godownloader on 2018-06-05T12:04:55Z. DO NOT EDIT.
+# Code generated by godownloader. DO NOT EDIT.
 #
 
 usage() {

pkg/logutils/log.go

@@ -1,6 +1,7 @@
 package logutils
 
 //go:generate mockgen -package logutils -source log.go -destination log_mock.go
+//go:generate goimports -w log_mock.go
 
 type Log interface {
 	Fatalf(format string, args ...interface{})