feat: tex rendering via temml

doerg/doerg-tex/index.js

@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+
+const commandLineArgs = require ("command-line-args")
+const temml = require ("temml")
+const fs = require ("node:fs")
+const path = require ("node:path")
+const { DecoderStream, EncoderStream } = require ("cbor-x")
+const { Transform } = require('node:stream')
+
+const cli_spec =
+      [ { name: "preamble" }
+      ]
+
+function load_preambles (preamble) {
+    const data = fs.readFileSync (preamble, "utf8") .toString ()
+    return temml.definePreamble (data)
+}
+
+let macros = {}
+
+function is_render_command (cmd) {
+    return cmd instanceof Array
+	       && cmd.length === 1
+	       && typeof cmd[0] === "string"
+}
+
+function do_command (cmd) {
+    try {
+	if (typeof cmd === "string") {
+	    return temml.renderToString (cmd, {macros})
+	} else if (is_render_command (cmd)) {
+	    return temml.renderToString (cmd[0], {displayMode: true,macros})
+	} else {
+	    return null
+	}
+    } catch (e) {
+	return e
+    }
+}
+
+function main () {
+    const options = commandLineArgs (cli_spec)
+    console.error (options)
+    macros = load_preambles (options.preamble)
+    const decoder = new DecoderStream ()
+    const encoder = new EncoderStream ()
+    process.stdin.pipe (decoder)
+    const command_responses = decoder.map (do_command)
+    decoder
+	.map (do_command)
+	.pipe (encoder)
+	.pipe (process.stdout)
+}
+
+main ()