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templatedir.go
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/
templatedir.go
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// Package templatedir provide two
// functions that allow to render a
// whole directory of go templates
// to itself or to another directory.
package templatedir
import (
"bytes"
"errors"
"fmt"
"io/fs"
"os"
"path"
"runtime"
"strings"
"sync"
"text/template"
"github.com/parro-it/vs/syncfs"
"github.com/parro-it/vs/writefs"
)
// RenderTo ...
func RenderTo(srcfs fs.FS, destfsys writefs.WriteFS, args interface{}) error {
destfs := syncfs.New(destfsys).(writefs.WriteFS)
res, walkErrs := walkDir(srcfs)
allFilesDone := sync.WaitGroup{}
allFilesDone.Add(runtime.NumCPU())
errs := make(SyncErrors, 1)
r := renderer{
srcfs: srcfs,
destfs: destfs,
args: args,
}
for i := 0; i < runtime.NumCPU(); i++ {
go func() {
defer allFilesDone.Done()
for src := range res {
fmt.Println("src --> ", src)
if errs.Failed() {
return
}
if errs.SetFailedOnErr(r.renderFile(src)) {
return
}
}
}()
}
err := <-walkErrs
allFilesDone.Wait()
if err == nil {
err = errs.Close()
}
return err
}
func walkDir(fsys fs.FS) (chan string, chan error) {
res := make(chan string)
errs := make(chan error)
go func() {
err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
if !d.IsDir() && strings.HasSuffix(path, ".template") {
res <- path
}
return nil
})
close(res)
if err != nil {
errs <- err
}
close(errs)
}()
return res, errs
}
func mkDirRec(fsys fs.FS, dir string) error {
destdir := strings.Split(dir, "/")
if len(destdir) == 0 {
destdir = []string{"."}
}
var pathAccum string
for _, seg := range destdir {
if pathAccum != "" {
pathAccum += "/"
}
pathAccum += seg
err := writefs.MkDir(fsys, pathAccum, fs.FileMode(0644))
if err != nil && !errors.Is(err, fs.ErrExist) {
return err
}
}
return nil
}
type renderer struct {
srcfs fs.FS
destfs writefs.WriteFS
args interface{}
}
func (r renderer) renderFile(src string) error {
tmpl, err := template.ParseFS(r.srcfs, src)
if err != nil {
return err
}
err = mkDirRec(r.destfs, path.Dir(src))
if err != nil && !errors.Is(err, fs.ErrExist) {
return err
}
err = writefs.Remove(r.destfs, src)
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return err
}
outname := strings.TrimSuffix(src, ".template")
t, err := template.New("filename").Parse(outname)
if err != nil {
return err
}
var buf bytes.Buffer
err = t.Execute(&buf, r.args)
if err != nil {
return err
}
outname = buf.String()
dest, err := writefs.OpenFile(r.destfs, outname, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, fs.FileMode(0644))
if err != nil {
return err
}
defer dest.Close()
return tmpl.Execute(dest, r.args)
}