feat: add 'repoman template-post-clone --rm-go-binary'

Signed-off-by: Manfred Touron <94029+moul@users.noreply.github.com>

project.go

@@ -269,6 +269,7 @@ func (p *project) showDiff() error {
 }
 
 func (p *project) openPR(branchName string, title string) error {
+	logger.Debug("opening a PR", zap.String("branch", branchName), zap.String("title", title))
 	initMoulBotEnv()
 	script := `
 		main() {

template-post-clone.go

@@ -5,7 +5,10 @@ import (
 	"fmt"
 	"io/fs"
 	"io/ioutil"
+	"os"
+	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"go.uber.org/multierr"
@@ -49,8 +52,71 @@ func doTemplatePostCloneOnce(_ context.Context, path string) error {
 		}
 	}
 
+	// rm go binary
+	if opts.TemplatePostClone.RemoveGoBinary {
+		logger.Debug("remove go binary", zap.String("project", project.Path))
+		// git rm main*.go
+		err := project.Git.workTree.RemoveGlob("main*.go")
+		if err != nil {
+			return fmt.Errorf("rm main*.go: %w", err)
+		}
+
+		// patch Makefile
+		{
+			path := filepath.Join(project.Git.Root, "Makefile")
+			content, err := ioutil.ReadFile(path)
+			if err != nil {
+				return fmt.Errorf("read Makefile: %w", err)
+			}
+			content = regexp.MustCompile(`(?m)^(DOCKER_IMAGE|GOBINS|NPM_PACKAGES) .=.*\n`).ReplaceAll(content, []byte(""))
+			content = regexp.MustCompile(`(?ms)^generate:.*.PHONY: generate\n\n`).ReplaceAll(content, []byte(""))
+			err = ioutil.WriteFile(path, content, 0)
+			if err != nil {
+				return fmt.Errorf("write file: %q: %w", path, err)
+			}
+			if _, err := project.Git.workTree.Add("Makefile"); err != nil {
+				return fmt.Errorf("git add %q: %w", path, err)
+			}
+		}
+
+		// remove files
+		{
+			for _, filename := range []string{"Dockerfile", ".goreleaser.yml", ".github/workflows/docker.yml"} {
+				_, err := project.Git.workTree.Remove(filename)
+				if err != nil {
+					return fmt.Errorf("git rm %q: %w", filename, err)
+				}
+			}
+		}
+
+		// perform various tasks
+		{
+			script := `
+			main() {
+				make generate go.depaware-update
+				git add AUTHORS README.md depaware.txt
+				make tidy
+				git add go.mod go.sum
+				git status
+			}
+			main
+		`
+			cmd := exec.Command("/bin/sh", "-xec", script)
+			cmd.Stdout = os.Stderr
+			cmd.Stderr = os.Stderr
+			cmd.Dir = project.Path
+			cmd.Env = os.Environ()
+
+			err := cmd.Run()
+			if err != nil {
+				return fmt.Errorf("standard script execution failed: %w", err)
+			}
+		}
+	}
+
 	// find and replace
 	{
+		logger.Debug("patch files to remove template strings", zap.String("project", project.Path))
 		visit := func(path string, info fs.FileInfo, err error) error {
 			if err != nil {
 				return fmt.Errorf("walk dir: %q: %w", path, err)