Build and run urfave-cli-genflags via its Makefile

so that `go.mod` files don't get all confused

cli.go

@@ -22,4 +22,4 @@
 //	}
 package cli
 
-//go:generate go run cmd/urfave-cli-genflags/main.go
+//go:generate make -C cmd/urfave-cli-genflags run

cmd/urfave-cli-genflags/Makefile

@@ -19,3 +19,7 @@ smoke-test: build
 .PHONY: show-cover
 show-cover:
 	go tool cover -func main.coverprofile
+
+.PHONY: run
+run: build
+	./urfave-cli-genflags

cmd/urfave-cli-genflags/main.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	_ "embed"
+	"fmt"
 	"log"
 	"os"
 	"os/exec"
@@ -37,6 +38,9 @@ var (
 func sh(ctx context.Context, exe string, args ...string) (string, error) {
 	cmd := exec.CommandContext(ctx, exe, args...)
 	cmd.Stderr = os.Stderr
+
+	fmt.Fprintf(os.Stderr, "# ---> %s\n", cmd)
+
 	outBytes, err := cmd.Output()
 	return string(outBytes), err
 }
@@ -89,10 +93,18 @@ func main() {
 				Aliases: []string{"N"},
 				Value:   "cli.",
 			},
+			&cli.PathFlag{
+				Name:  "goimports",
+				Value: filepath.Join(top, ".local/bin/goimports"),
+			},
 		},
 		Action: runGenFlags,
 	}
 
+	if err := os.Chdir(top); err != nil {
+		log.Fatal(err)
+	}
+
 	if err := app.RunContext(ctx, os.Args); err != nil {
 		log.Fatal(err)
 	}
@@ -163,11 +175,11 @@ func runGenFlags(cCtx *cli.Context) error {
 		return err
 	}
 
-	if _, err := sh(cCtx.Context, "goimports", "-w", cCtx.Path("generated-output")); err != nil {
+	if _, err := sh(cCtx.Context, cCtx.Path("goimports"), "-w", cCtx.Path("generated-output")); err != nil {
 		return err
 	}
 
-	if _, err := sh(cCtx.Context, "goimports", "-w", cCtx.Path("generated-test-output")); err != nil {
+	if _, err := sh(cCtx.Context, cCtx.Path("goimports"), "-w", cCtx.Path("generated-test-output")); err != nil {
 		return err
 	}