Exclude items by shell pattern as well as by name

Patterns such as `.*` or `@*` are matched against an item's own name
with `fnmatch`, in the same places as excluded names: resolving a
tree, extending a watch to a directory that appears later, and
delivering events. Dependents that prune large trees can now skip
whole families of directories without listing each name.

Sources/Inotify/ExclusionList.swift

@@ -0,0 +1,33 @@
+#if canImport(Musl)
+import Musl
+#else
+import Glibc
+#endif
+
+/// The item names an ``Inotify`` instance skips: exact names and shell
+/// patterns, both matched against an item's own name.
+struct ExclusionList: Sendable {
+	private var names: Set<String> = []
+	private var patterns: [String] = []
+
+	init(names: Set<String> = [], patterns: [String] = []) {
+		self.names = names
+		self.patterns = patterns
+	}
+
+	mutating func add(name: String) {
+		self.names.insert(name)
+	}
+
+	mutating func add(pattern: String) {
+		guard !self.patterns.contains(pattern) else { return }
+		self.patterns.append(pattern)
+	}
+
+	/// Patterns are matched as the shell matches file names: `*` and `?`
+	/// stand for any characters, `[…]` for a set, and a leading dot needs
+	/// no special treatment.
+	func excludes(_ name: String) -> Bool {
+		self.names.contains(name) || self.patterns.contains { fnmatch($0, name, 0) == 0 }
+	}
+}