ref: 5d2fceecafe182c6ddebc57475a4c1b2317e6216
dir: /scripts/fork_go_templates/main.go/
package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"github.com/gohugoio/hugo/common/hugio"
"github.com/spf13/afero"
)
func main() {
// TODO(bep) git checkout tag
// The current is built with Go version b68fa57c599720d33a2d735782969ce95eabf794 / go1.15dev
fmt.Println("Forking ...")
defer fmt.Println("Done ...")
cleanFork()
htmlRoot := filepath.Join(forkRoot, "htmltemplate")
for _, pkg := range goPackages {
copyGoPackage(pkg.dstPkg, pkg.srcPkg)
}
for _, pkg := range goPackages {
doWithGoFiles(pkg.dstPkg, pkg.rewriter, pkg.replacer)
}
goimports(htmlRoot)
gofmt(forkRoot)
}
const (
// TODO(bep)
goSource = "/Users/bep/dev/go/dump/go/src"
forkRoot = "../../tpl/internal/go_templates"
)
type goPackage struct {
srcPkg string
dstPkg string
replacer func(name, content string) string
rewriter func(name string)
}
var (
textTemplateReplacers = strings.NewReplacer(
`"text/template/`, `"github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate/`,
`"internal/fmtsort"`, `"github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"`,
`"internal/testenv"`, `"github.com/gohugoio/hugo/tpl/internal/go_templates/testenv"`,
"TestLinkerGC", "_TestLinkerGC",
// Rename types and function that we want to overload.
"type state struct", "type stateOld struct",
"func (s *state) evalFunction", "func (s *state) evalFunctionOld",
"func (s *state) evalField(", "func (s *state) evalFieldOld(",
"func (s *state) evalCall(", "func (s *state) evalCallOld(",
"func isTrue(val reflect.Value) (truth, ok bool) {", "func isTrueOld(val reflect.Value) (truth, ok bool) {",
)
testEnvReplacers = strings.NewReplacer(
`"internal/cfg"`, `"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"`,
)
htmlTemplateReplacers = strings.NewReplacer(
`. "html/template"`, `. "github.com/gohugoio/hugo/tpl/internal/go_templates/htmltemplate"`,
`"html/template"`, `template "github.com/gohugoio/hugo/tpl/internal/go_templates/htmltemplate"`,
"\"text/template\"\n", "template \"github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate\"\n",
`"html/template"`, `htmltemplate "html/template"`,
`"fmt"`, `htmltemplate "html/template"`,
)
)
func commonReplace(name, content string) string {
if strings.HasSuffix(name, "_test.go") {
content = strings.Replace(content, "package template\n", `// +build go1.13,!windows
package template
`, 1)
content = strings.Replace(content, "package template_test\n", `// +build go1.13
package template_test
`, 1)
content = strings.Replace(content, "package parse\n", `// +build go1.13
package parse
`, 1)
}
return content
}
var goPackages = []goPackage{
goPackage{srcPkg: "text/template", dstPkg: "texttemplate",
replacer: func(name, content string) string { return textTemplateReplacers.Replace(commonReplace(name, content)) }},
goPackage{srcPkg: "html/template", dstPkg: "htmltemplate", replacer: func(name, content string) string {
if strings.HasSuffix(name, "content.go") {
// Remove template.HTML types. We need to use the Go types.
content = removeAll(`(?s)// Strings of content.*?\)\n`, content)
}
content = commonReplace(name, content)
return htmlTemplateReplacers.Replace(content)
},
rewriter: func(name string) {
for _, s := range []string{"CSS", "HTML", "HTMLAttr", "JS", "JSStr", "URL", "Srcset"} {
rewrite(name, fmt.Sprintf("%s -> htmltemplate.%s", s, s))
}
rewrite(name, `"text/template/parse" -> "github.com/gohugoio/hugo/tpl/internal/go_templates/texttemplate/parse"`)
}},
goPackage{srcPkg: "internal/fmtsort", dstPkg: "fmtsort", rewriter: func(name string) {
rewrite(name, `"internal/fmtsort" -> "github.com/gohugoio/hugo/tpl/internal/go_templates/fmtsort"`)
}},
goPackage{srcPkg: "internal/testenv", dstPkg: "testenv",
replacer: func(name, content string) string { return testEnvReplacers.Replace(content) }, rewriter: func(name string) {
rewrite(name, `"internal/testenv" -> "github.com/gohugoio/hugo/tpl/internal/go_templates/testenv"`)
}},
goPackage{srcPkg: "internal/cfg", dstPkg: "cfg", rewriter: func(name string) {
rewrite(name, `"internal/cfg" -> "github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"`)
}},
}
var fs = afero.NewOsFs()
// Removes all non-Hugo files in the go_templates folder.
func cleanFork() {
must(filepath.Walk(filepath.Join(forkRoot), func(path string, info os.FileInfo, err error) error {
if !info.IsDir() && len(path) > 10 && !strings.Contains(path, "hugo") {
must(fs.Remove(path))
}
return nil
}))
}
func must(err error, what ...string) {
if err != nil {
log.Fatal(what, " ERROR: ", err)
}
}
func copyGoPackage(dst, src string) {
from := filepath.Join(goSource, src)
to := filepath.Join(forkRoot, dst)
fmt.Println("Copy", from, "to", to)
must(hugio.CopyDir(fs, from, to, func(s string) bool { return true }))
}
func doWithGoFiles(dir string,
rewrite func(name string),
transform func(name, in string) string) {
if rewrite == nil && transform == nil {
return
}
must(filepath.Walk(filepath.Join(forkRoot, dir), func(path string, info os.FileInfo, err error) error {
if info.IsDir() {
return nil
}
if !strings.HasSuffix(path, ".go") || strings.Contains(path, "hugo_") {
return nil
}
fmt.Println("Handle", path)
if rewrite != nil {
rewrite(path)
}
if transform == nil {
return nil
}
data, err := ioutil.ReadFile(path)
must(err)
f, err := os.Create(path)
must(err)
defer f.Close()
_, err = f.WriteString(transform(path, string(data)))
must(err)
return nil
}))
}
func removeAll(expression, content string) string {
re := regexp.MustCompile(expression)
return re.ReplaceAllString(content, "")
}
func rewrite(filename, rule string) {
cmf := exec.Command("gofmt", "-w", "-r", rule, filename)
out, err := cmf.CombinedOutput()
if err != nil {
log.Fatal("gofmt failed:", string(out))
}
}
func goimports(dir string) {
cmf := exec.Command("goimports", "-w", dir)
out, err := cmf.CombinedOutput()
if err != nil {
log.Fatal("goimports failed:", string(out))
}
}
func gofmt(dir string) {
cmf := exec.Command("gofmt", "-w", dir)
out, err := cmf.CombinedOutput()
if err != nil {
log.Fatal("gofmt failed:", string(out))
}
}