feat: add go-format example target

Runs `golangci-lint --fix` and `golines`.

.sage/main.go

@@ -10,6 +10,7 @@ import (
 	"go.einride.tech/sage/tools/sggo"
 	"go.einride.tech/sage/tools/sggolangcilint"
 	"go.einride.tech/sage/tools/sggolicenses"
+	"go.einride.tech/sage/tools/sggolines"
 	"go.einride.tech/sage/tools/sggoreview"
 	"go.einride.tech/sage/tools/sgmdformat"
 	"go.einride.tech/sage/tools/sgyamlfmt"
@@ -51,6 +52,16 @@ func GoLint(ctx context.Context) error {
 	return sggolangcilint.Run(ctx)
 }
 
+func GoLintFix(ctx context.Context) error {
+	sg.Logger(ctx).Println("fixing Go files...")
+	return sggolangcilint.Fix(ctx)
+}
+
+func GoFormat(ctx context.Context) error {
+	sg.Logger(ctx).Println("formatting Go files...")
+	return sggolines.Run(ctx)
+}
+
 func GoLicenses(ctx context.Context) error {
 	sg.Logger(ctx).Println("checking Go licenses...")
 	return sggolicenses.Check(ctx)

Makefile

@@ -67,6 +67,10 @@ format-yaml: $(sagefile)
 git-verify-no-diff: $(sagefile)
 	@$(sagefile) GitVerifyNoDiff
 
+.PHONY: go-format
+go-format: $(sagefile)
+	@$(sagefile) GoFormat
+
 .PHONY: go-licenses
 go-licenses: $(sagefile)
 	@$(sagefile) GoLicenses
@@ -75,6 +79,10 @@ go-licenses: $(sagefile)
 go-lint: $(sagefile)
 	@$(sagefile) GoLint
 
+.PHONY: go-lint-fix
+go-lint-fix: $(sagefile)
+	@$(sagefile) GoLintFix
+
 .PHONY: go-mod-tidy
 go-mod-tidy: $(sagefile)
 	@$(sagefile) GoModTidy

example/.sage/main.go

@@ -10,6 +10,7 @@ import (
 	"go.einride.tech/sage/tools/sggo"
 	"go.einride.tech/sage/tools/sggolangcilint"
 	"go.einride.tech/sage/tools/sggolicenses"
+	"go.einride.tech/sage/tools/sggolines"
 	"go.einride.tech/sage/tools/sggoreview"
 	"go.einride.tech/sage/tools/sgmdformat"
 	"go.einride.tech/sage/tools/sgyamlfmt"
@@ -54,6 +55,16 @@ func GoLint(ctx context.Context) error {
 	return sggolangcilint.Run(ctx)
 }
 
+func GoLintFix(ctx context.Context) error {
+	sg.Logger(ctx).Println("fixing Go files...")
+	return sggolangcilint.Fix(ctx)
+}
+
+func GoFormat(ctx context.Context) error {
+	sg.Logger(ctx).Println("formatting Go files...")
+	return sggolines.Run(ctx)
+}
+
 func GoLicenses(ctx context.Context) error {
 	sg.Logger(ctx).Println("checking Go licenses...")
 	return sggolicenses.Check(ctx)

tools/sggofumpt/tools.go

@@ -0,0 +1,53 @@
+package sggofumpt
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"go.einride.tech/sage/sg"
+	"go.einride.tech/sage/sgtool"
+)
+
+const (
+	name    = "gofumpt"
+	version = "0.6.0"
+)
+
+// Command returns an [*exec.Cmd] for golines.
+func Command(ctx context.Context, args ...string) *exec.Cmd {
+	sg.Deps(ctx, PrepareCommand)
+	return sg.Command(ctx, sg.FromBinDir(name), args...)
+}
+
+func PrepareCommand(ctx context.Context) error {
+	binDir := sg.FromToolsDir(name, version)
+	binary := filepath.Join(binDir, name)
+	hostOS := runtime.GOOS
+	hostArch := runtime.GOARCH
+	binURL := fmt.Sprintf(
+		"https://github.com/mvdan/gofumpt/"+
+			"releases/download/v%s/gofumpt_v%s_%s_%s",
+		version,
+		version,
+		hostOS,
+		hostArch,
+	)
+	if err := sgtool.FromRemote(
+		ctx,
+		binURL,
+		sgtool.WithDestinationDir(binDir),
+		sgtool.WithRenameFile(fmt.Sprintf("gofumpt_v%s_%s_%s", version, hostOS, hostArch), name),
+		sgtool.WithSkipIfFileExists(binary),
+		sgtool.WithSymlink(binary),
+	); err != nil {
+		return fmt.Errorf("unable to download %s: %w", name, err)
+	}
+	if err := os.Chmod(binary, 0o755); err != nil {
+		return fmt.Errorf("unable to make %s command: %w", name, err)
+	}
+	return nil
+}

tools/sggolines/tools.go

@@ -10,13 +10,28 @@ import (
 
 	"go.einride.tech/sage/sg"
 	"go.einride.tech/sage/sgtool"
+	"go.einride.tech/sage/tools/sggofumpt"
 )
 
 const (
 	name    = "golines"
 	version = "0.12.2"
 )
 
+// Run golines on all Go files in the current git root with gofumpt as default formatter.
+func Run(ctx context.Context) error {
+	sg.Deps(ctx, sggofumpt.PrepareCommand)
+	return Command(
+		ctx,
+		"--base-formatter=gofumpt",
+		"--ignore-generated",
+		"--max-len=120",
+		"--tab-len=1",
+		"--write-output",
+		".",
+	).Run()
+}
+
 // Command returns an [*exec.Cmd] for golines.
 func Command(ctx context.Context, args ...string) *exec.Cmd {
 	sg.Deps(ctx, PrepareCommand)