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Don't overwrite file if no changes were made
Always writing to the file, even if unchanged, updates the modified time and prevents incremental builds in Xcode.
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Sources/swift-format/Frontend/FormatFrontend.swift

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -49,8 +49,10 @@ class FormatFrontend: Frontend {
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to: &buffer,
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parsingDiagnosticHandler: diagnosticsEngine.consumeParserDiagnostic)
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52-
let bufferData = buffer.data(using: .utf8)! // Conversion to UTF-8 cannot fail
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try bufferData.write(to: url, options: .atomic)
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if buffer != source {
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let bufferData = buffer.data(using: .utf8)! // Conversion to UTF-8 cannot fail
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try bufferData.write(to: url, options: .atomic)
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}
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} else {
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try formatter.format(
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source: source,

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