Add vscode extension, command line argument, and positioned error handling.

newt-vscode/.eslintrc.json

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+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+        "ecmaVersion": 6,
+        "sourceType": "module"
+    },
+    "plugins": [
+        "@typescript-eslint"
+    ],
+    "rules": {
+        "@typescript-eslint/naming-convention": [
+            "warn",
+            {
+                "selector": "import",
+                "format": [ "camelCase", "PascalCase" ]
+            }
+        ],
+        "@typescript-eslint/semi": "warn",
+        "curly": "warn",
+        "eqeqeq": "warn",
+        "no-throw-literal": "warn",
+        "semi": "off"
+    },
+    "ignorePatterns": [
+        "out",
+        "dist",
+        "**/*.d.ts"
+    ]
+}

newt-vscode/.gitignore

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+dist
+node_modules
+*.vsix
+

newt-vscode/.vscodeignore

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+.vscode/**
+.vscode-test/**
+.gitignore
+vsc-extension-quickstart.md

newt-vscode/CHANGELOG.md

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+# Change Log
+
+All notable changes to the "newt-vscode" extension will be documented in this file.
+
+Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
+
+## [Unreleased]
+
+- Initial release

newt-vscode/README.md

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+# newt-vscode README
+
+newt extension for vscode

newt-vscode/esbuild.js

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+const esbuild = require("esbuild");
+
+const production = process.argv.includes('--production');
+const watch = process.argv.includes('--watch');
+
+/**
+ * @type {import('esbuild').Plugin}
+ */
+const esbuildProblemMatcherPlugin = {
+	name: 'esbuild-problem-matcher',
+
+	setup(build) {
+		build.onStart(() => {
+			console.log('[watch] build started');
+		});
+		build.onEnd((result) => {
+			result.errors.forEach(({ text, location }) => {
+				console.error(`✘ [ERROR] ${text}`);
+				console.error(`    ${location.file}:${location.line}:${location.column}:`);
+			});
+			console.log('[watch] build finished');
+		});
+	},
+};
+
+async function main() {
+	const ctx = await esbuild.context({
+		entryPoints: [
+			'src/extension.ts'
+		],
+		bundle: true,
+		format: 'cjs',
+		minify: production,
+		sourcemap: !production,
+		sourcesContent: false,
+		platform: 'node',
+		outfile: 'dist/extension.js',
+		external: ['vscode'],
+		logLevel: 'silent',
+		plugins: [
+			/* add to the end of plugins array */
+			esbuildProblemMatcherPlugin,
+		],
+	});
+	if (watch) {
+		await ctx.watch();
+	} else {
+		await ctx.rebuild();
+		await ctx.dispose();
+	}
+}
+
+main().catch(e => {
+	console.error(e);
+	process.exit(1);
+});

newt-vscode/language-configuration.json

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+{
+    "comments": {
+        // symbol used for single line comment. Remove this entry if your language does not support line comments
+        "lineComment": "--",
+        // symbols used for start and end a block comment. Remove this entry if your language does not support block comments
+        "blockComment": [ "/-", "-/" ]
+    },
+    // symbols used as brackets
+    "brackets": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"]
+    ],
+    // symbols that are auto closed when typing
+    "autoClosingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+        ["'", "'"]
+    ],
+    // symbols that can be used to surround a selection
+    "surroundingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+        ["'", "'"]
+    ]
+}

newt-vscode/package.json

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+{
+  "name": "newt-vscode",
+  "displayName": "newt-vscode",
+  "description": "newt language support",
+  "version": "0.0.1",
+  "license": "MIT",
+  "engines": {
+    "vscode": "^1.91.0"
+  },
+  "categories": [
+    "Programming Languages"
+  ],
+  "activationEvents": [
+  ],
+  "main": "./dist/extension.js",
+  "contributes": {
+    "languages": [{
+      "id": "newt",
+      "aliases": ["newt", "newt"],
+      "extensions": ["newt"],
+      "configuration": "./language-configuration.json"
+    }],
+    "grammars": [{
+      "language": "newt",
+      "scopeName": "source.newt",
+      "path": "./syntaxes/newt.tmLanguage.json"
+    }],
+    "commands": [
+      {
+        "command": "newt-vscode.check",
+        "title": "Check newt file"
+      }
+    ]
+
+  },
+  "scripts": {
+    "vscode:prepublish": "npm run package",
+    "compile": "npm run check-types && npm run lint && node esbuild.js",
+    "watch": "npm-run-all -p watch:*",
+    "watch:esbuild": "node esbuild.js --watch",
+    "package": "npm run check-types && npm run lint && node esbuild.js --production",
+    "compile-tests": "tsc -p . --outDir out",
+    "watch-tests": "tsc -p . -w --outDir out",
+    "pretest": "npm run compile-tests && npm run compile && npm run lint",
+    "check-types": "tsc --noEmit",
+    "lint": "eslint src --ext ts",
+    "test": "vscode-test"
+  },
+  "devDependencies": {
+    "@types/mocha": "^10.0.7",
+    "@types/node": "20.x",
+    "@types/vscode": "^1.90.0",
+    "@typescript-eslint/eslint-plugin": "^7.14.1",
+    "@typescript-eslint/parser": "^7.11.0",
+    "@vscode/test-cli": "^0.0.9",
+    "@vscode/test-electron": "^2.4.0",
+    "esbuild": "^0.21.5",
+    "eslint": "^8.57.0",
+    "npm-run-all": "^4.1.5",
+    "typescript": "^5.4.5"
+  }
+}

newt-vscode/src/extension.ts

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+import * as vscode from "vscode";
+import { exec } from "child_process";
+import path from "path";
+
+export function activate(context: vscode.ExtensionContext) {
+  const diagnosticCollection =
+    vscode.languages.createDiagnosticCollection("newt");
+
+  function checkDocument(document: vscode.TextDocument) {
+    const fileName = document.fileName;
+    // Is there a better way to do this? It will get fussy with quoting and all plus it's not visible to the user.
+    const workspaceFolder = vscode.workspace.getWorkspaceFolder(document.uri);
+    const cwd = workspaceFolder
+      ? workspaceFolder.uri.fsPath
+      : path.dirname(fileName);
+    const config = vscode.workspace.getConfiguration("newt");
+    const cmd = config.get<string>("path", "build/exec/newt");
+    const command = `${cmd} ${fileName}`;
+    exec(command, { cwd }, (err, stdout, _stderr) => {
+      if (err && err.code !== 1) {
+        vscode.window.showErrorMessage(`newt error: ${err}`);
+      }
+
+      // extract errors and messages from stdout
+      const lines = stdout.split("\n");
+      const diagnostics: vscode.Diagnostic[] = [];
+
+      for (let i = 0; i < lines.length; i++) {
+        const line = lines[i];
+        const match = line.match(/ERROR at \((\d+), (\d+)\): (.*)/);
+        if (match) {
+          let [_full, line, column, message] = match;
+          let lnum = Number(line);
+          let cnum = Number(column);
+          let start = new vscode.Position(lnum, cnum);
+          // we don't have the full range, so grab the surrounding word
+          let end = new vscode.Position(lnum, cnum+1);
+          let range =
+            document.getWordRangeAtPosition(start) ??
+            new vscode.Range(start, end);
+          // heuristics to grab the entire message:
+          // anything indented
+          // Context:, or Goal: are part of PRINTME
+          // unexpected / expecting appear in parse errors
+          while (
+            lines[i + 1]?.match(/^(  )/)
+          ) {
+            message += "\n" + lines[++i];
+          }
+          const severity = vscode.DiagnosticSeverity.Error;
+          const diag = new vscode.Diagnostic(range, message, severity);
+          diagnostics.push(diag);
+        }
+      }
+      diagnosticCollection.set(vscode.Uri.file(fileName), diagnostics);
+    });
+  }
+
+  const runPiForall = vscode.commands.registerCommand(
+    "newt-vscode.check",
+    () => {
+      const editor = vscode.window.activeTextEditor;
+      if (editor) {
+        const document = editor.document;
+        if (document.fileName.endsWith(".newt")) {
+          checkDocument(document);
+        }
+      }
+    }
+  );
+  context.subscriptions.push(runPiForall);
+
+  vscode.workspace.onDidSaveTextDocument((document) => {
+    if (document.fileName.endsWith(".newt")) {
+      vscode.commands.executeCommand("newt-vscode.check");
+    }
+  });
+  vscode.workspace.onDidOpenTextDocument((document) => {
+    if (document.fileName.endsWith(".newt")) {
+      vscode.commands.executeCommand("newt-vscode.check");
+    }
+  });
+  for (let document of vscode.workspace.textDocuments) {
+    if (document.fileName.endsWith(".newt")) {
+      checkDocument(document);
+    }
+  }
+  context.subscriptions.push(diagnosticCollection);
+}
+
+export function deactivate() {}

newt-vscode/syntaxes/newt.tmLanguage.json

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+{
+  "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+  "name": "newt",
+  "scopeName": "source.newt",
+  "patterns": [
+	{
+		"name": "comment.block.newt",
+		"begin": "/-",
+		"end": "`-/",
+		"contentName": "comment.block.newt"
+	},
+	{
+      "name": "comment.line.newt",
+      "begin": "--",
+      "end": "\\n"
+  },
+	{
+      "name": "variable.other.constant",
+      "match": "([\\w]+)\\."
+    },
+    {
+      "name": "entity.name.variable",
+      "match": "\\.([\\w]+)"
+    },
+	{
+		"name": "punctuation",
+		"match": ":|=>|\\"
+	},
+    {
+      "name": "keyword.other.operator.newt",
+      "match": "[\\p{Math}:!#$%&*+.,/<=>?@\\^|-]+"
+    },
+
+    {
+      "name": "keyword.command.newt",
+      "match": "\\b(module)\\b"
+    },
+    {
+      "name": "keyword.newt",
+      "match": "\\b(data)\\b"
+    },
+    // {
+    //   "name": "variable.other.constant.newt",
+    //   "match": "\\b(Type|Id|refl|sym|Gel|ungel)\\b",
+	  // "comment": "These are in the emacs mode, but some are user defined"
+    // }
+  ]
+}

newt-vscode/tsconfig.json

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+{
+	"compilerOptions": {
+		"module": "Node16",
+		"target": "ES2022",
+		"lib": [
+			"ES2022"
+		],
+		"sourceMap": true,
+		"rootDir": "src",
+		"strict": true   /* enable all strict type-checking options */
+		/* Additional Checks */
+		// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
+		// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
+		// "noUnusedParameters": true,  /* Report errors on unused parameters. */
+	}
+}