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Stop the preview app quitting on Xcode's launch arguments #10

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Merged
winebarrel merged 1 commit into from
Aug 9, 2026
Merged

Stop the preview app quitting on Xcode's launch arguments #10

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9 changes: 9 additions & 0 deletions Preview/PreviewApp.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -219,6 +219,15 @@ private struct Options {
let raw = try Self.value(after: argument, from: &iterator)
try set(argument, to: raw, explicitSize: &explicitSize)
default:
// Xcode launches the app with NSUserDefaults-style arguments
// such as `-NSDocumentRevisionsDebugMode YES`. Rejecting those
// means Run quits before the window ever appears, so skip any
// single-dash flag and the value that follows it. A misspelt
// `--option` still fails loudly.
guard argument.hasPrefix("--") else {
_ = iterator.next()
continue
}
throw OptionError("unknown argument: \(argument)")
}
}
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