From a605e5713d7582bf61934b0de67610d3fe3b60ec Mon Sep 17 00:00:00 2001
From: Fenris Wolf <fenris@folksprak.org>
Date: Sun, 17 Nov 2024 15:02:51 +0100
Subject: [PATCH] [add] output:markdown

---
 source/outputs/implementations/markdown.ts | 174 +++++++++++++++++++++
 tools/makefile                             |   1 +
 2 files changed, 175 insertions(+)
 create mode 100644 source/outputs/implementations/markdown.ts

diff --git a/source/outputs/implementations/markdown.ts b/source/outputs/implementations/markdown.ts
new file mode 100644
index 0000000..72a4aac
--- /dev/null
+++ b/source/outputs/implementations/markdown.ts
@@ -0,0 +1,174 @@
+
+/**
+ */
+class type_output_markdown implements type_output<string>
+{
+	public readonly kind : string = "markdown";
+	public readonly data : {};
+	public constructor(data : {}) {this.data = data;}
+	
+	/**
+	 */
+	private render_object_internal(
+		object : type_object,
+		options : {
+			depth ?: int;
+			headline_level ?: int;
+			list_level ?: int;
+		} = {}
+	) : string
+	{
+		options = Object.assign(
+			{
+				"depth": 0,
+				"headline_level": 0,
+				"list_level": 0,
+			},
+			options
+		);
+		return lib_plankton.call.distinguish<string>(
+			object,
+			{
+				"text": ({"content": content}) => lib_plankton.string.coin(
+					"{{content}}",
+					{
+						"content": content,
+					}
+				),
+				"code": ({"content": content}) => lib_plankton.string.coin(
+					"`{{content}}`",
+					{
+						"content": content,
+					}
+				),
+				"link": ({"target": target, "label": label}) => lib_plankton.string.coin(
+					"[{{label}}]({{target}})",
+					{
+						"target": target,
+						"label": label,
+					}
+				),
+				"section": ({"title": title, "content": content}) => lib_plankton.string.coin(
+					"{{head}}\n\n{{body}}\n\n\n",
+					{
+						"head": lib_plankton.string.coin(
+							"{{prefix}} {{value}}",
+							{
+								"prefix": "#".repeat(options.level + 1),
+								"value": title,
+							}
+						),
+						"body": this.render_object_internal(
+							content,
+							{
+								"depth": (options.depth + 1),
+								"headline_level": (options.level + 1),
+								"list_level": options.list_level,
+							}
+						),
+					}
+				),
+				"group": ({"members": members}) => lib_plankton.string.coin(
+					"{{members}}",
+					{
+						"members": (
+							members
+							.map(
+								x => this.render_object_internal(
+									x,
+									{
+										"depth": options.depth,
+										"headline_level": options.level,
+										"list_level": options.list_level
+									}
+								)
+							)
+							.join(
+								""
+							)
+						)
+					}
+				),
+				"list": ({"items": items}) => lib_plankton.string.coin(
+					"{{items}}",
+					{
+						"items": (
+							items
+							.map(
+								item => lib_plankton.string.coin(
+									"{{indentation}}- {{content}}",
+									{
+										"indentation": "  ".repeat(options.list_level),
+										"content": this.render_object_internal(
+											item,
+											{
+												"depth": (options.depth + 1),
+												"headline_level": options.level,
+												"list_level": (options.list_level + 1),
+											}
+										),
+									},
+								)
+							)
+							.join(
+								"\n"
+							)
+						),
+					}
+				),
+				"table": ({"head": head, "rows": rows}) => lib_plankton.string.coin(
+					"(unhandled)",
+					{
+					}
+				),
+			},
+			{
+				"fallback": (object) => lib_plankton.string.coin(
+					"(unhandled)",
+					{
+					}
+				),
+			}
+		);
+	}
+	
+	
+	/**
+	 * @implementation
+	 */
+	public render_object(
+		object : type_object
+	) : string
+	{
+		return this.render_object_internal(object);
+	}
+	
+	
+	/**
+	 * @implementation
+	 */
+	public render_document(
+		document : type_document
+	) : string
+	{
+		return this.render_object_internal(
+			document.content_main,
+			{
+			}
+		);
+	}
+	
+}
+
+
+/**
+ */
+output_kind_register(
+	"markdown",
+	(data, sub) => (
+		new type_output_markdown(
+			{
+			}
+		)
+	)
+);
diff --git a/tools/makefile b/tools/makefile
index 3aa4fce..917b6b1 100644
--- a/tools/makefile
+++ b/tools/makefile
@@ -35,6 +35,7 @@ ${dir_temp}/sd-unlinked.js: \
 		${dir_source}/document.ts \
 		${dir_source}/outputs/base.ts \
 		${dir_source}/outputs/implementations/json.ts \
+		${dir_source}/outputs/implementations/markdown.ts \
 		${dir_source}/outputs/implementations/html.ts \
 		${dir_source}/outputs/implementations/tex.ts \
 		${dir_source}/main.ts