Initial commit.

.gitignore

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+node_modules

README.md

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+This was made by Standa Lukeš @exyi

index.js

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+console.log(require('katex').renderToString('\\frac{2a}{b}'))

index.mjs

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+// KaTeX rendering server
+// Listens on unix socket, path is provided as first argument
+// Expects JSON lines, each line is a query with the following schema:
+// {
+//   formulas: [
+//     {
+//       tex: string,
+//       options?: object
+//     }
+//   ],
+//   options?: object
+// }
+
+// see https://katex.org/docs/options.html for list of available options
+// If options formulas[].options field is used, the global options field is ignored.
+
+// For each line, returns one JSON line with the following schema:
+// {
+//   results: [
+//     { html?: string } | { error?: string }
+//   ]
+// } | { error?: string }
+
+
+// If one formula is invalid, the error in results is used
+// If the entire query is invalid (couldn't parse JSON, for example), the outer error field is used
+
+
+import katex from 'katex'
+import net from 'net'
+import * as readline from 'readline'
+
+const myArgs = process.argv.slice(2)
+
+const unixSocketPath = myArgs[0]
+if (!unixSocketPath) {
+    console.error('you must specify socket path')
+    process.exit(1)
+}
+
+// This server listens on a Unix socket at /var/run/mysocket
+var unixServer = net.createServer(handleClient);
+unixServer.listen(unixSocketPath);
+console.log("OK")
+
+function handleExit(signal) {
+    // unixServer.emit('close')
+    unixServer.close(function () {
+
+    });
+    process.exit(0); // put this into the callback to avoid closing open connections
+}
+process.on('SIGINT', handleExit);
+process.on('SIGQUIT', handleExit);
+process.on('SIGTERM', handleExit);
+process.on('exit', handleExit);
+
+const defaultOptions = {}
+
+/**
+ * @param {net.Socket} socket
+ * @returns {Promise<void>}
+ * */
+function socketWrite(socket, data) {
+    return new Promise((resolve, reject) => {
+        socket.write(data, (err) => {
+            if (err) {
+                reject(err)
+            } else {
+                resolve()
+            }
+        })
+    })
+}
+
+/**
+ * @param {net.Socket} client
+ * */
+async function handleClient(client) {
+    const rl = readline.createInterface({ input: client })
+    
+    /* Added by GS: A stack of katex's `macros` objects, each group inherits
+     * the one from the parent group and can add its own stuff without
+     * affecting the parent.
+     */
+    let macroStack = [{}]
+    for await (const line of rl) {
+        try {
+            // The custom commands for pushing and popping the macro stack.
+            if (line === "begingroup") {
+                // Copy the current state of macros and push it onto the stack.
+                macroStack.push({...macroStack.slice(-1)[0]})
+                continue
+            } else if (line === "endgroup") {
+                macroStack.pop()
+                continue
+            } else if (line === "init") {
+                macroStack = [{}]
+                continue
+            }
+            const query = JSON.parse(line)
+            const results = []
+            for (const input of query.formulas) {
+                const options = input.options ?? query.options ?? defaultOptions
+                // Add macros from the macros option
+                if (options.macros) {
+                    for (const macro of Object.keys(options.macros)) {
+                        macroStack.slice(-1)[macro] = options.macros[macro]
+                    }
+                }
+                options.macros = macroStack.slice(-1)[0]
+                // Enforce globalGroup option, katex then saves created macros
+                // into the options.macros object.
+                options.globalGroup = true
+                try {
+                    const html = katex.renderToString(input.tex, options)
+                    results.push({ html })
+                } catch (e) {
+                    results.push({ error: String(e) })
+                }
+            }
+            await socketWrite(client, JSON.stringify({ results }, null, query.debug ? '  ' : undefined))
+            await socketWrite(client, '\n')
+        } catch (e) {
+            console.error(e)
+            await socketWrite(client, JSON.stringify({ error: String(e) }))
+            await socketWrite(client, '\n')
+        }
+    }
+}
+

package-lock.json

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+{
+  "name": "formatitko-katex-server",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "formatitko-katex-server",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "katex": "^0.16.3"
+      },
+      "bin": {
+        "formatitko-katex-server": "index.mjs"
+      }
+    },
+    "node_modules/commander": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
+      "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/katex": {
+      "version": "0.16.3",
+      "resolved": "https://registry.npmjs.org/katex/-/katex-0.16.3.tgz",
+      "integrity": "sha512-3EykQddareoRmbtNiNEDgl3IGjryyrp2eg/25fHDEnlHymIDi33bptkMv6K4EOC2LZCybLW/ZkEo6Le+EM9pmA==",
+      "funding": [
+        "https://opencollective.com/katex",
+        "https://github.com/sponsors/katex"
+      ],
+      "dependencies": {
+        "commander": "^8.0.0"
+      },
+      "bin": {
+        "katex": "cli.js"
+      }
+    }
+  }
+}

package.json

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+{
+  "name": "formatitko-katex-server",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.mjs",
+  "bin": {
+    "formatitko-katex-server":"index.mjs"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "katex": "^0.16.3"
+  }
+}

yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+commander@^8.3.0:
+  version "8.3.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-8.3.0.tgz#4837ea1b2da67b9c616a67afbb0fafee567bca66"
+  integrity sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==
+
+katex@^0.16.3:
+  version "0.16.9"
+  resolved "https://registry.yarnpkg.com/katex/-/katex-0.16.9.tgz#bc62d8f7abfea6e181250f85a56e4ef292dcb1fa"
+  integrity sha512-fsSYjWS0EEOwvy81j3vRA8TEAhQhKiqO+FQaKWp0m39qwOzHVBgAUBIXWj1pB+O2W3fIpNa6Y9KSKCVbfPhyAQ==
+  dependencies:
+    commander "^8.3.0"