fix: Do not generate text diff if not needed

Author: prantlf

lib/cli.js

@@ -220,7 +220,6 @@ function checkContents (file, source, parsed) {
   const { createTwoFilesPatch, structuredPatch } = require('diff')
   const structured = structuredPatch(`${file}.orig`, file, source, parsed, '', '', { context: 3 })
   const length = structured.hunks && structured.hunks.length
-  const diff = createTwoFilesPatch(`${file}.orig`, file, source, parsed, '', '', { context: 3 })
   if (length > 0) {
     const hunk = length === 1 ? 'hunk differs' : 'hunks differ'
     const message = `${length} ${hunk}`
@@ -232,6 +231,7 @@ function checkContents (file, source, parsed) {
       console.error(message)
     }
     if (!options.quiet) {
+      const diff = createTwoFilesPatch(`${file}.orig`, file, source, parsed, '', '', { context: 3 })
       console.log(diff)
     }
     if (options.continue) {