An example of 'Remove Duplicate Lines' macro for VSCodeMacros extension

vscmacros_remove_duplicate_lines.js

// [VSCode Macros] extension
// https://marketplace.visualstudio.com/items?itemName=EXCEEDSYSTEM.vscode-macros
const vscode = require('vscode');

/**
 * Macro configuration
 */
module.exports.macroCommands = {
  RemoveDuplicateLines: {
    no: 1,
    func: removeDupLines
  },
};

/**
 * Remove duplicate lines macro function
 */
function removeDupLines() {
  const editor = vscode.window.activeTextEditor;
  if (!editor) {
    return 'Editor is not opening.';
  }
  // get the selected text
  const document = editor.document;
  const selection = editor.selection;
  const text = document.getText(selection);
  if (text.length > 0) {
    // get a document EOL characters
    const documentEOL = {
      1: '\n',
      2: '\r\n'
    } [document.eol];
    // split text by newline
    const selectedLines = text.split(documentEOL);
    // mark the duplicates
    const appeared = new Set();
    const uniqueLines = selectedLines.map((lineText, rowIndex) => {
      if (lineText.length > 0 && appeared.has(lineText)) {
        return {
          text: lineText,
          row: -1
        };
      }
      appeared.add(lineText);
      return {
        text: lineText,
        row: rowIndex
      };
    });

    editor.edit(editBuilder => {
      // replace selected text without duplicate lines
      const replaced = uniqueLines
        .filter((value) => value.row > -1)
        .map((value) => value.text)
        .join(documentEOL);
      editBuilder.replace(selection, replaced);
    });
  }
}