refactor: extract templating into own file

1 files changed, 81 insertions, 0 deletions

diff --git a/internal/server/templates.go b/internal/server/templates.go
new file mode 100644
index 0000000..0b39729
--- /dev/null
+++ b/internal/server/templates.go
@@ -0,0 +1,81 @@
+package server
+
+import (
+	"fmt"
+	"html"
+	"html/template"
+	"log/slog"
+	"os"
+	"path"
+	"path/filepath"
+	"searchix/internal/options"
+	"strings"
+
+	"github.com/pkg/errors"
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
+)
+
+type TemplateCollection map[string]*template.Template
+
+var md = goldmark.New(
+	goldmark.WithExtensions(extension.NewLinkify()),
+)
+var templateFuncs = template.FuncMap{
+	"markdown": func(input options.Markdown) template.HTML {
+		var out strings.Builder
+		err := md.Convert([]byte(input), &out)
+		if err != nil {
+			slog.Warn(fmt.Sprintf("markdown conversion failed: %v", err))
+
+			return template.HTML(html.EscapeString(err.Error())) // #nosec G203 -- duh?
+		}
+
+		return template.HTML(out.String()) // #nosec G203
+	},
+}
+
+func loadTemplate(filename string) (*template.Template, error) {
+	text, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, errors.WithMessage(err, "could not read template")
+	}
+	name, _ := strings.CutSuffix(path.Base(filename), ".gotmpl")
+	tpl := template.New(name)
+	tpl.Funcs(templateFuncs)
+	_, err = tpl.Parse(string(text))
+	if err != nil {
+		return nil, errors.WithMessage(err, "could not parse template")
+	}
+
+	return tpl, nil
+}
+
+func loadTemplates() (TemplateCollection, error) {
+	templateDir := path.Join("frontend", "templates")
+	templates := make(TemplateCollection, 0)
+
+	index, err := loadTemplate(path.Join(templateDir, "index.gotmpl"))
+	if err != nil {
+		return nil, err
+	}
+	templates["index"] = index
+
+	templatePaths, err := filepath.Glob(path.Join(templateDir, "blocks", "*.gotmpl"))
+	if err != nil {
+		return nil, errors.WithMessage(err, "could not glob block templates")
+	}
+	for _, fullname := range templatePaths {
+		tpl, err := loadTemplate(fullname)
+		if err != nil {
+			return nil, err
+		}
+		_, err = tpl.AddParseTree("index", index.Tree)
+		if err != nil {
+			return nil, errors.WithMessage(err, "could not add index template")
+		}
+		templates[tpl.Name()] = tpl
+	}
+
+	return templates, nil
+}