From c352987645294838b7ea1eaa3cbcaf0994bf9dd0 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Mon, 22 Jan 2024 10:18:35 +0100
Subject: Sync from main

---
 server-katex/filter.lua | 23 +++++++++++++++++++++++
 server-katex/math.ts    | 18 ++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 server-katex/filter.lua
 create mode 100644 server-katex/math.ts

(limited to 'server-katex')

diff --git a/server-katex/filter.lua b/server-katex/filter.lua
new file mode 100644
index 0000000..1010217
--- /dev/null
+++ b/server-katex/filter.lua
@@ -0,0 +1,23 @@
+function Pandoc(doc)
+    local tmp_name = os.tmpname()
+    local math = assert(io.popen("deno run server-katex/math.ts > " .. tmp_name, "w"))
+    doc:walk({
+        Math = function(el)
+			if el.mathtype == 'DisplayMath' then
+				assert(math:write("d" .. el.text:gsub("\n", " ") .. "\n"))
+			else
+				assert(math:write("i" .. el.text:gsub("\n", " ") .. "\n"))
+			end
+        end
+    })
+    math:close()
+    local tmp = assert(io.open(tmp_name, "r"))
+    doc = doc:walk({
+        Math = function(el)
+			return pandoc.RawInline(FORMAT, tmp:read())
+        end
+	})
+    tmp:close()
+    os.remove(tmp_name)
+    return doc
+end
diff --git a/server-katex/math.ts b/server-katex/math.ts
new file mode 100644
index 0000000..7a5b891
--- /dev/null
+++ b/server-katex/math.ts
@@ -0,0 +1,18 @@
+import { readLines } from "https://deno.land/std@0.134.0/io/mod.ts";
+import katex from "https://cdn.jsdelivr.net/npm/katex@0.16.9/dist/katex.mjs";
+
+const macros = [];
+for await (const line of readLines(Deno.stdin)) {
+  try {
+    const output = katex.renderToString(line.slice(1), {
+      displayMode: line[0] == 'd',
+      throwOnError: false,
+	  macros: macros,
+	  strict: false,
+	  fleqn: false
+    }).replace(/(\r\n|\n|\r)/gm, "");
+	console.log(output);
+  } catch (error) {
+    throw new Error(`Input: ${line}\n\nError: ${error}`);
+  }
+}
-- 
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