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template.go
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template.go
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package template
import (
"github.com/go-go-golems/parka/pkg/handlers/config"
"github.com/go-go-golems/parka/pkg/render"
"github.com/go-go-golems/parka/pkg/server"
"io/fs"
)
type TemplateHandler struct {
fs fs.FS
TemplateFile string
rendererOptions []render.RendererOption
renderer *render.Renderer
alwaysReload bool
// TODO(manuel, 2023-06-20) Allow to pass in additional data from code, not just config file
}
type TemplateHandlerOption func(handler *TemplateHandler)
func WithDefaultFS(fs fs.FS) TemplateHandlerOption {
return func(handler *TemplateHandler) {
if handler.fs == nil {
handler.fs = fs
}
}
}
func WithAlwaysReload(alwaysReload bool) TemplateHandlerOption {
return func(handler *TemplateHandler) {
handler.alwaysReload = alwaysReload
}
}
func WithAppendRendererOptions(rendererOptions ...render.RendererOption) TemplateHandlerOption {
return func(handler *TemplateHandler) {
handler.rendererOptions = append(handler.rendererOptions, rendererOptions...)
}
}
func NewTemplateHandler(templateFile string, options ...TemplateHandlerOption) *TemplateHandler {
handler := &TemplateHandler{
TemplateFile: templateFile,
}
for _, option := range options {
option(handler)
}
return handler
}
func NewTemplateHandlerFromConfig(t *config.Template, options ...TemplateHandlerOption) (*TemplateHandler, error) {
handler := &TemplateHandler{
TemplateFile: t.TemplateFile,
}
for _, option := range options {
option(handler)
}
// the template name used to lookup the template is the template file path. We do need to specify
// a template name because we are also using the lookup to get the base template to render markdown files.
templateLookup := render.NewLookupTemplateFromFile(handler.TemplateFile, handler.TemplateFile)
// TODO(manuel, 2024-05-09) In dev mode, we want to watch the template file and reload when it changes
err := templateLookup.Reload()
if err != nil {
return nil, err
}
rendererOptions := append(handler.rendererOptions,
render.WithPrependTemplateLookups(templateLookup),
)
// TODO(manuel, 2023-06-20) We need to pass the base template renderer to render out markdown
r, err := render.NewRenderer(rendererOptions...)
if err != nil {
return nil, err
}
handler.renderer = r
return handler, nil
}
func (t *TemplateHandler) Serve(server_ *server.Server, path string) error {
server_.Router.GET(path, t.renderer.WithTemplateHandler(t.TemplateFile, nil))
return nil
}