Function wrapRange

static/editor.md/lib/codemirror/addon/wrap/hardwrap.js:42–93

(cm, from, to, options)

  }

  function wrapRange(cm, from, to, options) {
    from = cm.clipPos(from); to = cm.clipPos(to);
    var column = options.column || 80;
    var wrapOn = options.wrapOn || /\s\S|-[^\.\d]/;
    var killTrailing = options.killTrailingSpace !== false;
    var changes = [], curLine = "", curNo = from.line;
    var lines = cm.getRange(from, to, false);
    if (!lines.length) return null;
    var leadingSpace = lines[0].match(/^[ \t]*/)[0];

    for (var i = 0; i < lines.length; ++i) {
      var text = lines[i], oldLen = curLine.length, spaceInserted = 0;
      if (curLine && text && !wrapOn.test(curLine.charAt(curLine.length - 1) + text.charAt(0))) {
        curLine += " ";
        spaceInserted = 1;
      }
      var spaceTrimmed = "";
      if (i) {
        spaceTrimmed = text.match(/^\s*/)[0];
        text = text.slice(spaceTrimmed.length);
      }
      curLine += text;
      if (i) {
        var firstBreak = curLine.length > column && leadingSpace == spaceTrimmed &&
          findBreakPoint(curLine, column, wrapOn, killTrailing);
        // If this isn't broken, or is broken at a different point, remove old break
        if (!firstBreak || firstBreak.from != oldLen || firstBreak.to != oldLen + spaceInserted) {
          changes.push({text: [spaceInserted ? " " : ""],
                        from: Pos(curNo, oldLen),
                        to: Pos(curNo + 1, spaceTrimmed.length)});
        } else {
          curLine = leadingSpace + text;
          ++curNo;
        }
      }
      while (curLine.length > column) {
        var bp = findBreakPoint(curLine, column, wrapOn, killTrailing);
        changes.push({text: ["", leadingSpace],
                      from: Pos(curNo, bp.from),
                      to: Pos(curNo, bp.to)});
        curLine = leadingSpace + curLine.slice(bp.to);
        ++curNo;
      }
    }
    if (changes.length) cm.operation(function() {
      for (var i = 0; i < changes.length; ++i) {
        var change = changes[i];
        cm.replaceRange(change.text, change.from, change.to);
      }
    });
    return changes.length ? {from: changes[0].from, to: CodeMirror.changeEnd(changes[changes.length - 1])} : null;
  }

  CodeMirror.defineExtension("wrapParagraph", function(pos, options) {
    options = options || {};