55 lines
1.8 KiB
Swift
55 lines
1.8 KiB
Swift
import Darwin
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import Foundation
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/// Watch both the inode and its directory: many editors save by replacing the inode.
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@MainActor
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final class SFTPEditFileObservation {
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private let url: URL
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private let changed: () async -> Void
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private var fileSource: (any DispatchSourceFileSystemObject)?
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private var directorySource: (any DispatchSourceFileSystemObject)?
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private var debounce: Task<Void, Never>?
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init(url: URL, changed: @escaping () async -> Void) {
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self.url = url
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self.changed = changed
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directorySource = source(for: url.deletingLastPathComponent())
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reattachFile()
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}
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deinit {
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fileSource?.cancel()
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directorySource?.cancel()
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debounce?.cancel()
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}
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private func source(for url: URL) -> (any DispatchSourceFileSystemObject)? {
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let descriptor = Darwin.open(url.path, O_EVTONLY)
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guard descriptor >= 0 else { return nil }
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let source = DispatchSource.makeFileSystemObjectSource(
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fileDescriptor: descriptor, eventMask: [.write, .extend, .attrib, .rename, .delete, .revoke],
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queue: .global(qos: .utility))
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source.setCancelHandler { @Sendable in Darwin.close(descriptor) }
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source.setEventHandler { @Sendable [weak self] in
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Task { @MainActor [weak self] in self?.scheduleChange() }
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}
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source.resume()
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return source
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}
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private func reattachFile() {
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fileSource?.cancel()
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fileSource = source(for: url)
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}
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private func scheduleChange() {
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debounce?.cancel()
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debounce = Task { [weak self] in
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do { try await Task.sleep(for: .milliseconds(250)) } catch { return }
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guard let self else { return }
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await changed()
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reattachFile()
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}
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}
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}
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