✨ add bad linebreaks linter+fixer

package.json

@@ -1,18 +1,22 @@
 {
   "private": true,
   "scripts": {
+    "bad-linebreaks": "node ./scripts/bad-linebreaks.mjs",
+    "bad-linebreaks:fix": "npm run bad-linebreaks fix",
     "check-delegates": "node -e 'import(\"./scripts/check-delegates.mjs\").then(cd => cd.checkDelegates())'",
     "check-delegates-test": "node ./scripts/check-delegates-test.mjs",
+    "fix:all": "npm run lint:fix && npm run mdlint:fix && npm run bad-linebreaks:fix",
     "lint": "eslint . --ext .js,.mjs,.cjs",
     "lint:fix": "npm run lint -- --fix",
     "//": "markdownlint commands ignore old files",
     "mdlint": "markdownlint-cli2 '**/*.md' '!node_modules' '!meetings/201*/*.md' '!meetings/202[0-2]*/*.md' '!meetings/2023-0[1-3]/*.md'",
     "mdlint:fix": "markdownlint-cli2-fix '**/*.md' '!node_modules' '!meetings/201*/*.md' '!meetings/202[0-2]*/*.md' '!meetings/2023-0[1-3]/*.md'",
     "//": "markdownlint most likely to fail, so run that first",
-    "test": "npm run mdlint && npm run lint && npm run check-delegates-test && npm run check-delegates"
+    "test": "npm run mdlint && npm run bad-linebreaks && npm run lint && npm run check-delegates-test && npm run check-delegates"
   },
   "devDependencies": {
     "eslint": "^8.41.0",
+    "glob": "^10.3.3",
     "markdownlint-cli2": "^0.7.1"
   }
 }

scripts/bad-linebreaks.mjs

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+
+import fs from 'fs';
+import { glob } from 'glob';
+
+function getLine(txt, index) {
+
+  let line = 1;
+
+  for (let i = 0; i < index; i++) {
+    if (txt[i] === '\n') {
+      line += 1;
+    }
+  }
+
+  return line;
+
+}
+
+export function findBadLinebreaks(file, fix = false) {
+
+  let contents = fs.readFileSync(file, 'utf8').toString();
+
+  const re = /(?<=[\w\d ])\n(?=[\w\d])/g;
+  const matches = Array.from(contents.matchAll(re));
+
+  for (const m of matches) {
+
+    if (fix) {
+      contents = `${contents.slice(0, m.index).trimEnd()} ${contents.slice(m.index + 1)}`;
+    }
+    else {
+
+      const start = Math.max(0, m.index - 33);
+      const end = Math.min(contents.length - 1, m.index + 33);
+
+      console.log(`found erroneous linebreak at line ${getLine(contents, m.index)}:\n${contents.slice(start, end)}\n`);
+
+    }
+
+  }
+
+  if (matches.length > 0) {
+
+    if (fix) {
+      fs.writeFileSync(file, contents);
+      console.log(`fixed ${matches.length} erroneous linebreaks`);
+    }
+    else {
+      process.exitCode = 1;
+    }
+
+  }
+
+}
+
+// patterns match what is in package.json mdlint scripts
+const files = await glob(
+  '**/*.md',
+  {
+    ignore: [
+      'node_modules/**',
+      'meetings/201*/*.md',
+      'meetings/202[0-2]*/*.md',
+      'meetings/2023-0[1-3]/*.md',
+    ]
+  }
+);
+
+const fix = process.argv?.[2] === 'fix';
+
+for (const f of files) {
+  findBadLinebreaks(f, fix);
+}