init

.gitignore

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+node_modules
+.vscode-test/
+*.vsix

.vscodeignore

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+.vscode/**
+.vscode-test/**
+test/**
+.gitignore
+.yarnrc
+vsc-extension-quickstart.md
+**/jsconfig.json
+**/*.map
+**/.eslintrc.json

LICENSE

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+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+                    Version 2, December 2004
+
+ Copyright (C) 2004 Asuka Minato <not important>
+
+ Everyone is permitted to copy and distribute verbatim or modified
+ copies of this license document, and changing it is allowed as long
+ as the name is changed.
+
+            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

README.md

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+# MmaFmt
+
+Format mma code.
+
+Very slow, but works.
+
+Need to have <https://github.com/WolframResearch/codeformatter> installed first.

extension.js

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+// The module 'vscode' contains the VS Code extensibility API
+// Import the module and reference it with the alias vscode in your code below
+const vscode = require("vscode");
+const { spawnSync } = require("child_process");
+
+// This method is called when your extension is activated
+// Your extension is activated the very first time the command is executed
+/**
+ * @param {vscode.ExtensionContext} context
+ */
+function activate(context) {
+  context.subscriptions.push(
+    vscode.languages.registerDocumentFormattingEditProvider("wolfram", {
+      provideDocumentFormattingEdits(document) {
+        const cellContent = [];
+        for (let i = 0; i < document.lineCount; i++) {
+          cellContent.push(document.lineAt(i).text);
+        }
+        const cellContentString = cellContent.join("\n");
+
+        return [
+          vscode.TextEdit.replace(
+            new vscode.Range(
+              new vscode.Position(0, 0),
+              new vscode.Position(
+                document.lineCount - 1,
+                document.lineAt(document.lineCount - 1).text.length
+              )
+            ),
+
+            spawnSync(`wolframscript`, ["-f", "./fmt.wls", cellContentString], {
+              timeout: 30000,
+              stdio: "pipe",
+            }).stdout.toString()
+          ),
+        ];
+      },
+    })
+  );
+}
+// This method is called when your extension is deactivated
+function deactivate() {}
+
+module.exports = {
+  activate,
+  deactivate,
+};

fmt.wls

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+Needs["CodeFormatter`"];
+
+$ScriptCommandLine //
+Last //
+CodeFormatter`CodeFormat //
+Print

jsconfig.json

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+{
+	"compilerOptions": {
+		"module": "commonjs",
+		"target": "ES2020",
+		"checkJs": true, /* Typecheck .js files. */
+		"lib": [
+			"ES2020"
+		]
+	},
+	"exclude": [
+		"node_modules"
+	]
+}

package.json

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+{
+  "name": "mmafmt",
+  "displayName": "mmafmt",
+  "description": "fmt code",
+  "version": "0.0.1",
+  "repository": {
+    "url": "whatever"
+  },
+  "activationEvents": [
+    "onLanguage:wolfram"
+  ],
+  "engines": {
+    "vscode": "^1.75.0"
+  },
+  "categories": [
+    "Programming Languages",
+    "Keymaps"
+  ],
+  "main": "./extension.js",
+  "contributes": {
+    "configuration": {
+      "title": "MmaFmt"
+    },
+    "languages": [
+      {
+        "id": "wolfram",
+        "aliases": [
+          "Wolfram Language"
+        ],
+        "extensions": [
+          ".wls",
+          ".wlnb",
+          ".wl",
+          ".nb"
+        ]
+      }
+    ]
+  }
+}