Function getPatchForDisplay

src/utils/diff.ts:128–177

({
  filePath,
  fileContents,
  edits,
  ignoreWhitespace = false,
}: {
  filePath: string
  fileContents: string
  edits: FileEdit[]
  ignoreWhitespace?: boolean
})

 */

export function getPatchForDisplay({
  filePath,
  fileContents,
  edits,
  ignoreWhitespace = false,
}: {
  filePath: string
  fileContents: string
  edits: FileEdit[]
  ignoreWhitespace?: boolean
}): StructuredPatchHunk[] {
  const preparedFileContents = escapeForDiff(
    convertLeadingTabsToSpaces(fileContents),
  )
  const result = structuredPatch(
    filePath,
    filePath,
    preparedFileContents,
    edits.reduce((p, edit) => {
      const { old_string, new_string } = edit
      const replace_all = 'replace_all' in edit ? edit.replace_all : false
      const escapedOldString = escapeForDiff(
        convertLeadingTabsToSpaces(old_string),
      )
      const escapedNewString = escapeForDiff(
        convertLeadingTabsToSpaces(new_string),
      )

      if (replace_all) {
        return p.replaceAll(escapedOldString, () => escapedNewString)
      } else {
        return p.replace(escapedOldString, () => escapedNewString)
      }
    }, preparedFileContents),
    undefined,
    undefined,
    {
      context: CONTEXT_LINES,
      ignoreWhitespace,
      timeout: DIFF_TIMEOUT_MS,
    },
  )
  if (!result) {
    return []
  }
  return result.hunks.map(_ => ({
    ..._,
    lines: _.lines.map(unescapeFromDiff),
  }))
}