func()

in internal/web/render.go [40:151]

• 98 lines of code
• 22 McCabe index (conditional complexity)

func (site *Site) renderHTML(p Page, tmpl string, r *http.Request) ([]byte, error) {
	// Clone p, because we are going to set its Content key-value pair.
	p2 := make(Page)
	for k, v := range p {
		p2[k] = v
	}
	p = p2

	url, ok := p["URL"].(string)
	if !ok {
		// Set URL - caller did not.
		p["URL"] = r.URL.Path
	}
	file, _ := p["File"].(string)
	data, _ := p["FileData"].(string)

	// Load base template.
	base, err := site.readFile(".", tmpl)
	if err != nil {
		return nil, err
	}

	dir := strings.Trim(path.Dir(url), "/")
	if dir == "" {
		dir = "."
	}
	sd := &siteDir{site, dir}

	t := template.New("site.tmpl").Funcs(template.FuncMap{
		"add":          func(a, b int) int { return a + b },
		"sub":          func(a, b int) int { return a - b },
		"mul":          func(a, b int) int { return a * b },
		"div":          func(a, b int) int { return a / b },
		"code":         sd.code,
		"data":         sd.data,
		"page":         sd.page,
		"pages":        sd.pages,
		"play":         sd.play,
		"request":      func() *http.Request { return r },
		"path":         func() pkgPath { return pkgPath{} },
		"strings":      func() pkgStrings { return pkgStrings{} },
		"file":         sd.file,
		"first":        first,
		"markdown":     markdown,
		"raw":          raw,
		"yaml":         yamlFn,
		"presentStyle": presentStyle,
	})
	t.Funcs(site.funcs)

	if err := tmplfunc.Parse(t, string(base)); err != nil {
		return nil, err
	}

	// Load page-specific layout template.
	layout, _ := p["layout"].(string)
	if layout == "" {
		l, ok := site.findLayout(dir, "default")
		if ok {
			layout = l
		} else {
			layout = "none"
		}
	} else if path.IsAbs(layout) {
		layout = strings.TrimLeft(path.Clean(layout+".tmpl"), "/")
	} else if strings.Contains(layout, "/") {
		layout = path.Join(dir, layout+".tmpl")
	} else if layout != "none" {
		l, ok := site.findLayout(dir, layout)
		if !ok {
			return nil, fmt.Errorf("cannot find layout %q", layout)
		}
		layout = l
	}

	if layout != "none" {
		ldata, err := site.readFile(".", layout)
		if err != nil {
			return nil, err
		}
		if err := tmplfunc.Parse(t.New(layout), string(ldata)); err != nil {
			return nil, err
		}
	}

	var buf bytes.Buffer
	if _, ok := p["Content"]; !ok && data != "" {
		// Load actual Markdown content (also a template).
		tf := t.New(file)
		if err := tmplfunc.Parse(tf, data); err != nil {
			return nil, err
		}
		if err := tf.Execute(&buf, p); err != nil {
			return nil, err
		}
		if strings.HasSuffix(file, ".md") {
			html, err := markdownToHTML(buf.String())
			if err != nil {
				return nil, err
			}
			p["Content"] = html
		} else {
			p["Content"] = template.HTML(buf.String())
		}
		buf.Reset()
	}

	if err := t.Execute(&buf, p); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}