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package main
import (
"embed"
"fmt"
"io"
"io/fs"
"os"
"path"
"strings"
"text/template"
)
const (
templatePath = "templates/"
verbatimPath = templatePath + "verbatim"
templateGlob = templatePath + "*.tpl"
)
//go:embed templates
var templates embed.FS
func writeVerbatimFile(outputDir string, entry fs.DirEntry) error {
inName := path.Join(verbatimPath, entry.Name())
input, err := templates.Open(inName)
if err != nil {
return fmt.Errorf("reading bundled file '%s': %w", entry.Name(), err)
}
defer input.Close()
writeFn := func(writer io.Writer) error {
_, err := io.Copy(writer, input)
return err
}
return writeOutput(outputDir, entry.Name(), writeFn)
}
func writeVerbatim(outputDir string) error {
entries, err := templates.ReadDir(verbatimPath)
if err != nil {
return err
}
for _, e := range entries {
if err = writeVerbatimFile(outputDir, e); err != nil {
return err
}
}
return nil
}
func Write(config EngardeConfig) error {
if err := os.MkdirAll(config.OutputDir, 0755); err != nil {
return fmt.Errorf("creating output directory '%s': %w", config.OutputDir, err)
}
if err := writeVerbatim(config.OutputDir); err != nil {
return fmt.Errorf("copying default files: %w", err)
}
if err := writeTemplates(config.OutputDir, config); err != nil {
return fmt.Errorf("writing template files: %w", err)
}
return nil
}
var funcMap = template.FuncMap{
"upper": strings.ToUpper,
}
func writeTemplates(outputDir string, config EngardeConfig) error {
tpls, err := template.New("root").Funcs(funcMap).ParseFS(templates, templateGlob)
if err != nil {
return fmt.Errorf("parsing templates: %w", err)
}
for _, tpl := range tpls.Templates() {
if err = writeTemplate(tpl, outputDir, config); err != nil {
return err
}
}
return nil
}
func writeTemplate(tpl *template.Template, outputDir string, config EngardeConfig) error {
resultName := strings.TrimSuffix(tpl.Name(), ".tpl")
writeFn := func(w io.Writer) error {
return tpl.Execute(w, config)
}
return writeOutput(outputDir, resultName, writeFn)
}
func writeOutput(outputDir, fileName string, writeFn func(writer io.Writer) error) error {
outName := path.Join(outputDir, fileName)
output, err := os.Create(outName)
if err != nil {
return fmt.Errorf("creating '%s': %w", outName, err)
}
defer output.Close()
if err = writeFn(encodedWriter(output)); err != nil {
return fmt.Errorf("writing to '%s': %w", outName, err)
}
return nil
}
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