161 lines
3.3 KiB
Go
161 lines
3.3 KiB
Go
package templates
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import (
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"bytes"
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"embed"
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"fmt"
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"io/fs"
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"os"
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"slices"
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"sync"
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"text/template"
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"github.com/evcc-io/evcc/templates/definition"
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"github.com/samber/lo"
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"gopkg.in/yaml.v3"
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)
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var (
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//go:embed includes/*.tpl
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includeFS embed.FS
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// baseTmpl holds all included template definitions
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baseTmpl *template.Template
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templates = make(map[Class][]Template)
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ConfigDefaults configDefaults
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mu sync.Mutex
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encoderLanguage string
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)
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func init() {
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ConfigDefaults.Load()
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baseTmpl = template.Must(template.ParseFS(includeFS, "includes/*.tpl"))
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for _, class := range []Class{Charger, Meter, Vehicle, Tariff} {
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load(class)
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}
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}
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// Register adds a template file to the registry
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func Register(class Class, filepath string) error {
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b, err := os.ReadFile(filepath)
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if err != nil {
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return err
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}
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tmpl, err := fromBytes(b)
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if err != nil {
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return fmt.Errorf("processing template '%s' failed: %w", filepath, err)
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}
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return register(class, tmpl)
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}
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func register(class Class, tmpl Template) error {
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if slices.ContainsFunc(templates[class], func(t Template) bool { return t.Template == tmpl.Template }) {
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return fmt.Errorf("duplicate template name: %s", tmpl.Template)
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}
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templates[class] = append(templates[class], tmpl)
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return nil
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}
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func fromBytes(b []byte) (Template, error) {
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// panic if template definition contains unknown fields
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dec := yaml.NewDecoder(bytes.NewReader(b))
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dec.KnownFields(true)
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var definition TemplateDefinition
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if err := dec.Decode(&definition); err != nil {
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return Template{}, err
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}
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tmpl := Template{
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TemplateDefinition: definition,
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}
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err := tmpl.ResolvePresets()
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if err == nil {
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err = tmpl.ResolveGroup()
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}
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if err == nil {
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err = tmpl.UpdateParamsWithDefaults()
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}
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if err == nil {
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err = tmpl.Validate()
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}
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return tmpl, err
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}
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func load(class Class) {
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err := fs.WalkDir(definition.YamlTemplates, class.String(), func(filepath string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if d.IsDir() {
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return nil
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}
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b, err := fs.ReadFile(definition.YamlTemplates, filepath)
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if err != nil {
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return err
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}
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tmpl, err := fromBytes(b)
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if err != nil {
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return fmt.Errorf("processing template '%s' failed: %w", filepath, err)
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}
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return register(class, tmpl)
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})
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if err != nil {
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panic(err)
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}
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}
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// EncoderLanguage sets the template language for encoding json
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func EncoderLanguage(lang string) {
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mu.Lock()
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defer mu.Unlock()
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encoderLanguage = lang
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}
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type filterFunc func([]Template) []Template
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// WithDeprecated returns a filterFunc that includes all templates
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func WithDeprecated() filterFunc {
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return func(t []Template) []Template {
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return t
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}
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}
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// ByClass returns templates for class excluding deprecated templates
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func ByClass(class Class, opt ...filterFunc) []Template {
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res := templates[class]
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if len(opt) == 0 {
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opt = append(opt, func(t []Template) []Template {
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return lo.Filter(t, func(t Template, _ int) bool {
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return !t.Deprecated
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})
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})
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}
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for _, o := range opt {
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res = o(res)
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}
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return res
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}
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// ByClass returns templates for class and name including deprecated templates
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func ByName(class Class, name string) (Template, error) {
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for _, tmpl := range templates[class] {
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if tmpl.Template == name || slices.Contains(tmpl.Covers, name) {
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return tmpl, nil
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}
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}
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return Template{}, fmt.Errorf("template not found: %s", name)
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}
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