make newSku resiliant to column moves

src/newSku.ts

@@ -1,6 +1,8 @@
 import {
+  getColumnByName,
   getCellRangeByColumnName,
   getCellValueByColumnName,
+  getColumnValuesByName,
 } from "./sheetUtils"
 
 
@@ -23,6 +25,10 @@ export function newSkuHandler(e: GoogleAppsScript.Events.SheetsOnEdit) {
 
 export function newSku(row: number) {
   let sheet = SpreadsheetApp.getActive().getSheetByName("product_inventory")
+  let skuPrefixCol = getColumnByName(sheet, "sku_prefix")
+  console.log("skuPrefixCol: " + skuPrefixCol)
+  let idCol = getColumnByName(sheet, "#")
+  console.log("idCol: " + idCol)
   let idCell = getCellRangeByColumnName(sheet, "#", row)
   let safeToOverwrite: string[] = ["?", "n", ""]
   let idCellValue = idCell.getValue()
@@ -32,20 +38,20 @@ export function newSku(row: number) {
     console.log("ID '" + idCellValue + "' is not safe to overwrite, returning")
     return
   }
-  var idArray = sheet.getRange(2, 9, sheet.getLastRow(), 1).getValues()
+  var skuArray = getColumnValuesByName(sheet, "sku")
   var regExp = new RegExp(`^` + skuPrefixCellValue + `-0*(\\d+)$`)
   console.log("regExp: " + regExp.toString())
   var maxId = 0
-  for (let i = 0; i < idArray.length; i++) {
+  for (let i = 0; i < skuArray.length; i++) {
     console.log("checking row " + (i + 1))
-    if (null == idArray[i] || String(idArray[i]) == "") {
+    if (null == skuArray[i] || String(skuArray[i]) == "") {
-      console.log("ID cell looks null")
+      console.log("SKU cell looks null")
       continue
     }
-    console.log("ID cell: '" + idArray[i] + "'")
+    console.log("SKU cell: '" + skuArray[i] + "'")
-    var match = regExp.exec(String(idArray[i]))
+    var match = regExp.exec(String(skuArray[i]))
     if (null === match) {
-      console.log("ID cell did not match")
+      console.log("SKU cell did not match")
       continue
     }
     let numId = Number(match[1])

src/sheetUtils.ts

@@ -24,12 +24,20 @@ export function getCellValueByColumnName(
 export function getColumnRangeByName(
   sheet: GoogleAppsScript.Spreadsheet.Sheet,
   columnName: string
+) {
+  let column = getColumnByName(sheet, columnName)
+  if (column != -1) {
+    return sheet.getRange(2, column, sheet.getMaxRows())
+  }
+}
+
+export function getColumnByName(
+  sheet: GoogleAppsScript.Spreadsheet.Sheet,
+  columnName: string
 ) {
   let data = sheet.getRange("A1:1").getValues()
   let column = data[0].indexOf(columnName)
-  if (column != -1) {
+  return column + 1
-    return sheet.getRange(2, column + 1, sheet.getMaxRows())
-  }
 }
 
 export function getColumnValuesByName(