chore: embed templates for internal commands (#2314)

internal/dns/docs/generator.go

@@ -5,6 +5,7 @@ package main
 import (
 	"bufio"
 	"bytes"
+	"embed"
 	"errors"
 	"fmt"
 	"go/format"
@@ -19,15 +20,21 @@ import (
 	"github.com/go-acme/lego/v4/internal/dns/descriptors"
 )
 
+//go:embed templates
+var templateFS embed.FS
+
 const (
 	root = "../../../"
 
-	mdTemplate     = root + "internal/dns/docs/dns.md.tmpl"
-	cliTemplate    = root + "internal/dns/docs/dns.go.tmpl"
-	cliOutput      = root + "cmd/zz_gen_cmd_dnshelp.go"
-	docOutput      = root + "docs/content/dns"
-	readmeTemplate = root + "internal/dns/docs/readme.md.tmpl"
-	readmePath     = root + "README.md"
+	cliOutput  = root + "cmd/zz_gen_cmd_dnshelp.go"
+	docOutput  = root + "docs/content/dns"
+	readmePath = root + "README.md"
+)
+
+const (
+	mdTemplate     = "templates/dns.md.tmpl"
+	cliTemplate    = "templates/dns.go.tmpl"
+	readmeTemplate = "templates/readme.md.tmpl"
 )
 
 const (
@@ -74,7 +81,7 @@ func generateDocumentation(m descriptors.Provider) error {
 
 	defer func() { _ = file.Close() }()
 
-	return template.Must(template.ParseFiles(mdTemplate)).Execute(file, m)
+	return template.Must(template.ParseFS(templateFS, mdTemplate)).Execute(file, m)
 }
 
 func generateCLIHelp(models *descriptors.Providers) error {
@@ -87,14 +94,14 @@ func generateCLIHelp(models *descriptors.Providers) error {
 
 	defer func() { _ = file.Close() }()
 
-	tlt := template.New(filepath.Base(cliTemplate)).Funcs(map[string]interface{}{
-		"safe": func(src string) string {
-			return strings.ReplaceAll(src, "`", "'")
-		},
-	})
-
 	b := &bytes.Buffer{}
-	err = template.Must(tlt.ParseFiles(cliTemplate)).Execute(b, models)
+	err = template.Must(
+		template.New(filepath.Base(cliTemplate)).Funcs(map[string]interface{}{
+			"safe": func(src string) string {
+				return strings.ReplaceAll(src, "`", "'")
+			},
+		}).ParseFS(templateFS, cliTemplate),
+	).Execute(b, models)
 	if err != nil {
 		return err
 	}
@@ -110,7 +117,7 @@ func generateCLIHelp(models *descriptors.Providers) error {
 }
 
 func generateReadMe(models *descriptors.Providers) error {
-	tpl := html.Must(html.New(filepath.Base(readmeTemplate)).ParseFiles(readmeTemplate))
+	tpl := html.Must(html.New(filepath.Base(readmeTemplate)).ParseFS(templateFS, readmeTemplate))
 	providers := orderProviders(models)
 
 	file, err := os.Open(readmePath)

internal/dns/providers/generator.go

@@ -4,6 +4,7 @@ package main
 
 import (
 	"bytes"
+	_ "embed"
 	"fmt"
 	"go/format"
 	"log"
@@ -18,10 +19,12 @@ import (
 const (
 	root = "../../../"
 
-	srcTemplate = "internal/dns/providers/dns_providers.go.tmpl"
-	outputPath  = "providers/dns/zz_gen_dns_providers.go"
+	outputPath = "providers/dns/zz_gen_dns_providers.go"
 )
 
+//go:embed dns_providers.go.tmpl
+var srcTemplate string
+
 func main() {
 	err := generate()
 	if err != nil {
@@ -42,16 +45,14 @@ func generate() error {
 
 	defer func() { _ = file.Close() }()
 
-	tmplFile := filepath.Join(root, srcTemplate)
-
-	tlt := template.New(filepath.Base(tmplFile)).Funcs(map[string]interface{}{
-		"cleanName": func(src string) string {
-			return strings.ReplaceAll(src, "-", "")
-		},
-	})
-
 	b := &bytes.Buffer{}
-	err = template.Must(tlt.ParseFiles(tmplFile)).Execute(b, info)
+	err = template.Must(
+		template.New("").Funcs(map[string]interface{}{
+			"cleanName": func(src string) string {
+				return strings.ReplaceAll(src, "-", "")
+			},
+		}).Parse(srcTemplate),
+	).Execute(b, info)
 	if err != nil {
 		return err
 	}

internal/useragent/generator.go

@@ -2,26 +2,31 @@ package main
 
 import (
 	"bytes"
+	"embed"
 	"fmt"
 	"go/ast"
 	"go/format"
 	"go/parser"
 	"go/token"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strconv"
 	"strings"
 	"text/template"
 )
 
+//go:embed templates
+var templateFS embed.FS
+
 type Generator struct {
 	baseUserAgent string
-	template      string
+	templatePath  string
 	sourcePath    string
 }
 
-func NewGenerator(baseUserAgent string, tmpl string, sourcePath string) *Generator {
-	return &Generator{baseUserAgent: baseUserAgent, template: tmpl, sourcePath: sourcePath}
+func NewGenerator(baseUserAgent string, templatePath string, sourcePath string) *Generator {
+	return &Generator{baseUserAgent: baseUserAgent, templatePath: templatePath, sourcePath: sourcePath}
 }
 
 func (g *Generator) Release(mode string) error {
@@ -58,7 +63,7 @@ func (g *Generator) Detach() error {
 }
 
 func (g *Generator) writeUserAgentFile(filename, version, comment string) error {
-	tmpl, err := template.New("ua").Parse(g.template)
+	tmpl, err := template.New(filepath.Base(g.templatePath)).ParseFS(templateFS, g.templatePath)
 	if err != nil {
 		return err
 	}

internal/useragent/main.go

@@ -8,6 +8,18 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
+const (
+	dnsBaseUserAgent = "goacme-lego/"
+	dnsSourceFile    = "./providers/dns/internal/useragent/useragent.go"
+	dnsTemplate      = "templates/dns.go.tmpl"
+)
+
+const (
+	senderBaseUserAgent = "xenolf-acme/"
+	senderSourceFile    = "./acme/api/internal/sender/useragent.go"
+	senderTemplate      = "templates/sender.go.tmpl"
+)
+
 func main() {
 	app := cli.NewApp()
 	app.Name = "lego-releaser"

internal/useragent/templates/dns.go.tmpl

@@ -1,10 +1,4 @@
-package main
-
-const dnsBaseUserAgent = "goacme-lego/"
-
-const dnsSourceFile = "./providers/dns/internal/useragent/useragent.go"
-
-const dnsTemplate = `// Code generated by 'internal/useragent'; DO NOT EDIT.
+// Code generated by 'internal/useragent'; DO NOT EDIT.
 
 package useragent
 
@@ -33,4 +27,3 @@ func Get() string {
 func SetHeader(h http.Header) {
 	h.Set("User-Agent", Get())
 }
-`

internal/useragent/templates/sender.go.tmpl

@@ -1,10 +1,4 @@
-package main
-
-const senderBaseUserAgent = "xenolf-acme/"
-
-const senderSourceFile = "./acme/api/internal/sender/useragent.go"
-
-const senderTemplate = `// Code generated by 'internal/useragent'; DO NOT EDIT.
+// Code generated by 'internal/useragent'; DO NOT EDIT.
 
 package sender
 
@@ -17,5 +11,3 @@ const (
 	// NOTE: Update this with each tagged release.
 	ourUserAgentComment = "{{ .comment }}"
 )
-
-`