For the ToDo list of Google Spreadsheet

sort-tasks.gs

function sort() {
  const TARGET_SHEETS = ['全て']

  const sheet = SpreadsheetApp.getActiveSheet()

  if (!TARGET_SHEETS.includes(sheet.getName()))
    return

  const [_, targetColumn] = sheet
    .getRange(1, 1, 1, sheet.getMaxColumns())
    .getValues()
    .flat()
    .map((x, i) => [x, i + 1])
    .find(([x]) => x === '優先順')

  const range = sheet.getRange(1, targetColumn, sheet.getMaxRows())

  if (range.getValues().flat().some(x => x === ''))
    return

  sheet.sort(targetColumn)
}