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111 lines
3.0 KiB
Go
111 lines
3.0 KiB
Go
package templates
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import (
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"html/template"
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"io"
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"log"
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"path"
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"strings"
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"git.phc.dm.unipi.it/phc/website/config"
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"git.phc.dm.unipi.it/phc/website/util"
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)
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// CachedTemplate holds a reference to the list of patterns to preload and a reference to the already parsed template
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type CachedTemplate struct {
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PreLoadTemplatePatterns []string
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cachedTmpl *template.Template
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}
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// NewCacheTemplate creates a new template from a list of patterns a loads it
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func NewCacheTemplate(loadPatterns ...string) *CachedTemplate {
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cachedTemplate := &CachedTemplate{
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PreLoadTemplatePatterns: loadPatterns,
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cachedTmpl: nil,
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}
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template.Must(cachedTemplate.Load(template.New("")))
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return cachedTemplate
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}
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// Load returns the cached template or loads it from disk using the list of preload (glob) patterns.
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func (ct *CachedTemplate) Load(t *template.Template) (*template.Template, error) {
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if ct.cachedTmpl != nil {
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return ct.cachedTmpl, nil
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}
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ct.cachedTmpl = t
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for _, pattern := range ct.PreLoadTemplatePatterns {
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var err error
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ct.cachedTmpl, err = ct.cachedTmpl.ParseGlob(pattern)
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if err != nil {
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return nil, err
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}
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}
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return ct.cachedTmpl, nil
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}
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// Reload the pattern from disk (used for developing)
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func (ct *CachedTemplate) Reload() {
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ct.cachedTmpl = nil
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template.Must(ct.Load(nil))
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}
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// Template returns the cached template
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func (ct *CachedTemplate) Template() *template.Template {
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log.Printf("preloadPatterns: %v", ct.PreLoadTemplatePatterns)
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return ct.cachedTmpl
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}
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// TODO: Add a render function to CachedTemplate instead of returning the template reference. In this way the Template Renderer would not have a "direct" dependency on "html/template"...
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// TemplateRenderer holds cached templates for rendering
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type TemplateRenderer struct {
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viewsDir string
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preloadTemplatePatterns []string
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templateCache map[string]*CachedTemplate
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}
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// NewRenderer constructs a template renderer with a base file
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func NewRenderer(rootPath string, loadPatterns ...string) *TemplateRenderer {
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return &TemplateRenderer{
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rootPath,
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loadPatterns,
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map[string]*CachedTemplate{},
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}
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}
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func (r *TemplateRenderer) Load(name string) *CachedTemplate {
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cachedTemplate, present := r.templateCache[name]
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if !present {
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loaders := []string{}
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loaders = append(loaders, r.preloadTemplatePatterns...)
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loaders = append(loaders, path.Join(r.viewsDir, name))
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cachedTemplate = NewCacheTemplate(loaders...)
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r.templateCache[name] = cachedTemplate
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}
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return cachedTemplate
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}
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// Render the template, also injects "Page" and "Config" values in the template
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func (r *TemplateRenderer) Render(w io.Writer, name string, data util.Map) error {
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cachedTemplate := r.Load(name)
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if config.Mode == "development" {
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cachedTemplate.Reload()
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}
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newData := util.Map{}
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newData.Apply(data)
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newData["Page"] = util.Map{
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// Used to inject a page specific class on <body>
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"Name": strings.TrimSuffix(path.Base(name), ".html"),
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}
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newData["Config"] = config.Object()
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return cachedTemplate.Template().ExecuteTemplate(w, "base", newData)
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}
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