Drafts Directory: JS Beautify

Action

Posted by RoyRogers, Last update over 4 years ago

Indents blocks of code using two spaces for each level,
by first cleaning all existing tab or space indents.
- Keeps original line spacings to max 1 blank line.
- Keeps ‘} else/else if (…) {‘ on same line.

Install

Steps

script

// JS Beautify
// RV 2020-03-14 at 22:18

// Indents blocks of code using two spaces for each level,
// by first cleaning all existing tab or space indents.
// Keeps original line spacings to max 1 blank line.
// Keeps '} else/else if (…) {' on same line.

function main() {
  let text = draft.content;
  
  // RegEx pre wash:
  // Remove all indents, both tabs and spaces:
  text = text.replace(/^[ \t]*/gm, '');
  text = text.replace(/[ \t]*$/gm, ''); // trailing spaces
  
  // Multi to double linefeeds:
  text = text.replace(/\n\n+/g, '\n\n');
  // Keep '} else/else if (…) {' on same line:
  text = text.replace(/\n\}\s+else/g, '\n} else');
  text = text.replace(/\n+(function )/g, '\n\n$1');
  
  let cleanCode = cleanLines(text);
  
  if (preview(cleanCode)) {
    draft.saveVersion();
    editor.setText(cleanCode);
  } else {
    context.cancel('Canceled by user');
  }
}

function cleanLines(text) {
  let lines = text.split('\n')
  let code = new myIndent();
    
  for (let line of lines) {
    if (line.match(/^\/\//))
    {
      code.add(line); // add commented line as it is.
    } else if (line.match(/^}.*?\{$/)) {
      code.outdent();
      code.add(line);
      code.indent();
    } else if (line.match(/\{$/)) {
      code.add(line);
      code.indent();
    } else if (line.match(/^\}/)) {
      code.outdent();
      code.add(line);
    } else {
      code.add(line);
    }
  }
  return code.getCode();
}

class myIndent {
  constructor() {
    // Indent = '  ' // (two spaces) as recommended for JS.
    this.ind = '  ';
    this.indents = [];
    this.lines = [];
  }
  
  indent() {
    this.indents.push(this.ind);
  }
  
  outdent() {
    this.indents.pop();
  }
  
  add(line) {
    this.lines.push(this.indents.join('') + line);
  }
  
  getCode() {
    return this.lines.join('\n');
  }
}

function preview(text) {
  // Test: < > " ' &
  text = text.replace(/</g, '&lt;');
  // text = text.replace(/>/g, '&gt;');
  // text = text.replace(/&/g, '&amp;');
  // text = text.replace(/'/g, "&apos;");
  // text = text.replace(/"/g, '&quot;');
  
  if (app.themeMode == 'dark') {
    var css = "body { background: #222; color: #ddd; }";
  } else {
    var css = "body { background: #fff; color: #444; }";
  }
  
  let html = `<html><style>${css}</style><body>
  <h3>Result-code: Press to 'Continue' to update draft.<h3>
  <hr>
  <pre>${text}</pre>
  </body></html>`
  let preview = HTMLPreview.create();
  return preview.show(html);
}

main();

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