Markdown preview (#224)

internal/i18n/locales/en-US.yml

@@ -43,6 +43,7 @@ gist.new.add-file: Add file
 gist.new.create-public-button: Create public gist
 gist.new.create-unlisted-button: Create unlisted gist
 gist.new.create-private-button: Create private gist
+gist.new.preview: Preview
 
 gist.edit.editing: Editing
 gist.edit.change-visibility: Make

internal/render/markdown.go

@@ -41,6 +41,12 @@ func MarkdownFile(file *git.File) (RenderedFile, error) {
 		Type: "Markdown",
 	}, err
 }
+func MarkdownString(content string) (string, error) {
+	var buf bytes.Buffer
+	err := newMarkdown().Convert([]byte(content), &buf)
+
+	return buf.String(), err
+}
 
 func newMarkdown() goldmark.Markdown {
 	return goldmark.New(

internal/utils/validator.go

@@ -56,7 +56,7 @@ func validateReservedKeywords(fl validator.FieldLevel) bool {
 	name := fl.Field().String()
 
 	restrictedNames := map[string]struct{}{}
-	for _, restrictedName := range []string{"assets", "register", "login", "logout", "settings", "admin-panel", "all", "search", "init", "healthcheck"} {
+	for _, restrictedName := range []string{"assets", "register", "login", "logout", "settings", "admin-panel", "all", "search", "init", "healthcheck", "preview"} {
 		restrictedNames[restrictedName] = struct{}{}
 	}
 

internal/web/gist.go

@@ -890,3 +890,14 @@ func checkbox(ctx echo.Context) error {
 
 	return plainText(ctx, 200, "ok")
 }
+
+func preview(ctx echo.Context) error {
+	content := ctx.FormValue("content")
+
+	previewStr, err := render.MarkdownString(content)
+	if err != nil {
+		return errorRes(500, "Error rendering markdown", err)
+	}
+
+	return plainText(ctx, 200, previewStr)
+}

internal/web/server.go

@@ -235,6 +235,7 @@ func NewServer(isDev bool) *Server {
 
 		g1.GET("/", create, logged)
 		g1.POST("/", processCreate, logged)
+		g1.GET("/preview", preview, logged)
 
 		g1.GET("/healthcheck", healthcheck)