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script

// cursor up

var ending = '\n';

var selRange = editor.getSelectedRange();
var cursor = selRange[0];
var t = editor.getText();

var endPrevLine = t.lastIndexOf(ending, cursor-1);
var begLine = endPrevLine+1;

var endPrevPrevLine = t.lastIndexOf(ending, endPrevLine-1);
var begPrevLine = endPrevPrevLine+1;
var lenPrevLine = endPrevLine-begPrevLine;

var column = Math.min(lenPrevLine, cursor-begLine);
cursor = Math.max(0, begPrevLine+column);
editor.setSelectedRange(cursor, 0);