gistfile1.txt

// Global variables 
let copiedFormat = null; 
let styleCounter = 1; 
let customStyles = {}; 

// Promise wrappers for TX Text Control API 
const get = (method) => 
    new Promise((resolve, reject) => 
        TXTextControl.selection[method](v => resolve(v), e => reject(e)) 
    ); 
 
const set = (method, val) => 
    new Promise((resolve, reject) => 
        TXTextControl.selection[method](val, () => resolve(), e => reject(e)) 
    ); 
 
const getLength = () => 
    new Promise((resolve, reject) => 
        TXTextControl.selection.getLength(v => resolve(v), e => reject(e)) 
    ); 
 
const selectWord = () => 
    new Promise((resolve, reject) => 
        TXTextControl.selectWord(() => resolve(), e => reject(e)) 
    ); 

// Utility function to check if selected text has uniform formatting 

function isCommonValueSelectedAsync(selection, attr) { 

  return new Promise((resolve, reject) => { 

    selection.isCommonSelectionValueSelected( 

      attr, 

      (result) => { 

        resolve(result); // true/false 

      }, 

      reject 

    ); 

  }); 

}