scaffold.go
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package scaffold
import (
"io/fs"
"os"
"path/filepath"
"strings"
"text/template"
"congo.gg"
)
// Data holds template variables for scaffold rendering.
type Data struct {
Name string
Module string
Dir string // app subdirectory (default: "web")
WithFrontend bool
WithAssistant bool
WithPlatform bool
WithDatabase bool
}
// RenderProject walks res/scaffold/ and writes files into targetDir.
//
// Routing rules:
// - res/scaffold/web/ → targetDir/<Dir>/
// - res/scaffold/<path> → targetDir/<path>
//
// Files ending in .tmpl are executed as text/template with <<>> delimiters
// and written with the .tmpl suffix stripped. All other files are copied verbatim.
func RenderProject(targetDir string, data Data) error {
const root = "res/scaffold"
return fs.WalkDir(congo.ScaffoldFS, root, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
rel := strings.TrimPrefix(path, root+"/")
if rel == path || rel == "" {
return nil
}
// Map web/ subdirectory to the configured app dir.
if strings.HasPrefix(rel, "web/") {
rel = data.Dir + "/" + strings.TrimPrefix(rel, "web/")
} else if rel == "web" && d.IsDir() {
rel = data.Dir
}
outPath := filepath.Join(targetDir, rel)
if d.IsDir() {
return os.MkdirAll(outPath, 0755)
}
content, err := fs.ReadFile(congo.ScaffoldFS, path)
if err != nil {
return err
}
if strings.HasSuffix(path, ".tmpl") {
outPath = strings.TrimSuffix(outPath, ".tmpl")
os.MkdirAll(filepath.Dir(outPath), 0755)
return renderTemplate(outPath, filepath.Base(path), content, data)
}
os.MkdirAll(filepath.Dir(outPath), 0755)
return os.WriteFile(outPath, content, 0644)
})
}
// RenderApp renders only the app subdirectory (controllers/, models/, views/, main.go)
// for adding a new app to an existing project.
func RenderApp(targetDir string, data Data) error {
const root = "res/scaffold/web"
return fs.WalkDir(congo.ScaffoldFS, root, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
rel := strings.TrimPrefix(path, root+"/")
if rel == path || rel == "" {
return nil
}
outPath := filepath.Join(targetDir, rel)
if d.IsDir() {
return os.MkdirAll(outPath, 0755)
}
content, err := fs.ReadFile(congo.ScaffoldFS, path)
if err != nil {
return err
}
if strings.HasSuffix(path, ".tmpl") {
outPath = strings.TrimSuffix(outPath, ".tmpl")
os.MkdirAll(filepath.Dir(outPath), 0755)
return renderTemplate(outPath, filepath.Base(path), content, data)
}
os.MkdirAll(filepath.Dir(outPath), 0755)
return os.WriteFile(outPath, content, 0644)
})
}
// renderTemplate executes a template to a buffer first, then writes to disk.
// Prevents partial files on template execution errors.
func renderTemplate(outPath, name string, content []byte, data Data) error {
tmpl, err := template.New(name).Delims("<<", ">>").Parse(string(content))
if err != nil {
return err
}
var buf strings.Builder
if err := tmpl.Execute(&buf, data); err != nil {
return err
}
return os.WriteFile(outPath, []byte(buf.String()), 0644)
}