JS Comment

script

// JS Comments
// 2020-03-10 at 17:06 EST

// Togle JS comments and keep original indents
// Note! Does not comment blank lines!

let tag = "// " // set to prefered tag
let lnRange = editor.getSelectedLineRange();
let text = editor.getTextInRange(lnRange[0],lnRange[1]);
let selRange = editor.getSelectedRange();
let offset = 0;
let newText = '';
let pos = selRange[0] - lnRange[0];
let len = text.length;
let sel = selRange[1]
let selPos = selRange[0];
let selLen = selRange[1];

main: {
  let re = new RegExp('^[ \t]*' + tag, '');

  // Check if first line already has tag:
  if (text.match(re)) {
    // Removing comment tags:
    let re = new RegExp('^([ \t]*)' + tag, 'gm');
    newText = text.replace(re, '$1')
    selLen = text.length;
    selPos = lnRange[0];
    offset = 0;
    if (len = 3) offset = -pos ; 
    if (sel > 0) sel = newText.length;
  } else if (sel == 0 && !text.match(/\S/)) {
    // blank line
    newText = tag;
    offset = 3;
  } else if (sel == 0) {
    // Text unselected, cursor at left margin:
    // alert(text);
    newText = text.replace(/^([ \t]*)(.*)/, '$1// $2')
    selPos = lnRange[0];
    selLen = text.length;
  } else {
    // Text selected:
    m = text.match(/^([ \t]+)/);
    if (m) {
      let indent = m[1];
      let re = new RegExp('^' + indent, 'gm');
      newText = text.replace(re, indent + tag);
    } else {
      let re = new RegExp('^(.+)', 'gm');
      newText = text.replace(re, '// $1');
    }
    
    // newText = text.replace(/^([ \t]*)(\S.*)$/gm, '$1// $2')
    selPos = lnRange[0];
    selLen = text.length;
    sel = newText.length;
  }

  // update text and set new selection:
  editor.setTextInRange(selPos, selLen, newText);
  editor.setSelectedRange(selRange[0] + offset, sel);

}