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package builder
import (
"encoding/json"
"os"
"path/filepath"
"strings"
)
// ImportMap represents a browser importmap.
type ImportMap struct {
Imports map[string]string `json:"imports"`
}
// GenerateImportMap scans libDir for .js files and produces an importmap JSON string.
//
// Naming rules:
// - lib/chart.js → "chart"
// - lib/icons/index.js → "icons"
// - lib/utils/helpers.js → "utils/helpers"
func GenerateImportMap(libDir string) (string, error) {
imports := make(map[string]string)
if _, err := os.Stat(libDir); os.IsNotExist(err) {
b, _ := json.MarshalIndent(ImportMap{Imports: imports}, "", " ")
return string(b), nil
}
err := filepath.WalkDir(libDir, func(path string, d os.DirEntry, err error) error {
if err != nil || d.IsDir() || !strings.HasSuffix(path, ".js") {
return err
}
rel, _ := filepath.Rel(libDir, path)
rel = filepath.ToSlash(rel)
dir := filepath.ToSlash(filepath.Dir(rel))
base := strings.TrimSuffix(filepath.Base(rel), ".js")
var importName string
switch {
case dir == ".":
importName = base
case base == "index":
importName = dir
default:
importName = dir + "/" + base
}
imports[importName] = "/lib/" + rel
return nil
})
if err != nil {
return "", err
}
b, err := json.MarshalIndent(ImportMap{Imports: imports}, "", " ")
return string(b), err
}
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