1 files changed, 126 insertions, 0 deletions
diff --git a/modules/markup/markdown/renderconfig.go b/modules/markup/markdown/renderconfig.go
new file mode 100644
index 00000000..f4c48d1b
--- /dev/null
+++ b/modules/markup/markdown/renderconfig.go
@@ -0,0 +1,126 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markdown
+
+import (
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/modules/markup"
+
+	"github.com/yuin/goldmark/ast"
+	"gopkg.in/yaml.v3"
+)
+
+// RenderConfig represents rendering configuration for this file
+type RenderConfig struct {
+	Meta     markup.RenderMetaMode
+	Icon     string
+	TOC      string // "false": hide,  "side"/empty: in sidebar,  "main"/"true": in main view
+	Lang     string
+	yamlNode *yaml.Node
+
+	// Used internally.  Cannot be controlled by frontmatter.
+	metaLength int
+}
+
+func renderMetaModeFromString(s string) markup.RenderMetaMode {
+	switch strings.TrimSpace(strings.ToLower(s)) {
+	case "none":
+		return markup.RenderMetaAsNone
+	case "table":
+		return markup.RenderMetaAsTable
+	default: // "details"
+		return markup.RenderMetaAsDetails
+	}
+}
+
+// UnmarshalYAML implement yaml.v3 UnmarshalYAML
+func (rc *RenderConfig) UnmarshalYAML(value *yaml.Node) error {
+	if rc == nil {
+		return nil
+	}
+
+	rc.yamlNode = value
+
+	type commonRenderConfig struct {
+		TOC  string `yaml:"include_toc"`
+		Lang string `yaml:"lang"`
+	}
+	var basic commonRenderConfig
+	if err := value.Decode(&basic); err != nil {
+		return fmt.Errorf("unable to decode into commonRenderConfig %w", err)
+	}
+
+	if basic.Lang != "" {
+		rc.Lang = basic.Lang
+	}
+
+	rc.TOC = basic.TOC
+
+	type controlStringRenderConfig struct {
+		Gitea string `yaml:"gitea"`
+	}
+
+	var stringBasic controlStringRenderConfig
+
+	if err := value.Decode(&stringBasic); err == nil {
+		if stringBasic.Gitea != "" {
+			rc.Meta = renderMetaModeFromString(stringBasic.Gitea)
+		}
+		return nil
+	}
+
+	type yamlRenderConfig struct {
+		Meta *string `yaml:"meta"`
+		Icon *string `yaml:"details_icon"`
+		TOC  *string `yaml:"include_toc"`
+		Lang *string `yaml:"lang"`
+	}
+
+	type yamlRenderConfigWrapper struct {
+		Gitea *yamlRenderConfig `yaml:"gitea"`
+	}
+
+	var cfg yamlRenderConfigWrapper
+	if err := value.Decode(&cfg); err != nil {
+		return fmt.Errorf("unable to decode into yamlRenderConfigWrapper %w", err)
+	}
+
+	if cfg.Gitea == nil {
+		return nil
+	}
+
+	if cfg.Gitea.Meta != nil {
+		rc.Meta = renderMetaModeFromString(*cfg.Gitea.Meta)
+	}
+
+	if cfg.Gitea.Icon != nil {
+		rc.Icon = strings.TrimSpace(strings.ToLower(*cfg.Gitea.Icon))
+	}
+
+	if cfg.Gitea.Lang != nil && *cfg.Gitea.Lang != "" {
+		rc.Lang = *cfg.Gitea.Lang
+	}
+
+	if cfg.Gitea.TOC != nil {
+		rc.TOC = *cfg.Gitea.TOC
+	}
+
+	return nil
+}
+
+func (rc *RenderConfig) toMetaNode() ast.Node {
+	if rc.yamlNode == nil {
+		return nil
+	}
+	switch rc.Meta {
+	case markup.RenderMetaAsTable:
+		return nodeToTable(rc.yamlNode)
+	case markup.RenderMetaAsDetails:
+		return nodeToDetails(rc.yamlNode, rc.Icon)
+	default:
+		return nil
+	}
+}