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Pull the URLs into guard clauses.

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This commit is contained in:
Rob Rix 2015-10-29 15:36:42 -04:00
parent 7f0d18934c
commit a16e0ede56
1 changed files with 3 additions and 1 deletions
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4
prototype/doubt-difftool/main.swift
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@ -73,7 +73,9 @@ func termWithInput(language: TSLanguage)(_ string: String) -> Term? {
}
let arguments = BoundsCheckedArray(array: Process.arguments)
if let aURL = arguments[1].flatMap(NSURL.init), aString = readFile(aURL), bURL = arguments[2].flatMap(NSURL.init), bString = readFile(bURL), c = arguments[3], ui = arguments[4] {
guard let aURL = arguments[1].flatMap(NSURL.init) else { throw "need state A" }
guard let bURL = arguments[2].flatMap(NSURL.init) else { throw "need state B" }
if let aString = readFile(aURL), bString = readFile(bURL), c = arguments[3], ui = arguments[4] {
guard let aType = aURL.pathExtension, bType = bURL.pathExtension else { throw "can’t tell what type we have here" }
guard aType == bType else { throw "can’t compare files of different types" }
guard let language = languagesByFileExtension[aType] else { throw "don’t know how to parse files of type \(aType)" }