FuzzySelector.init: Throw error if init fails

Author: juri

Sources/CLI/CLI.swift

@@ -21,18 +21,20 @@ struct FuzzyCLI: AsyncParsableCommand {
 
     mutating func run() async throws {
         let lines = DirectoryLister(root: URL(string: ".")!).contents
-        guard
-            let selector = FuzzySelector(
+        let choices: [URL]
+        do {
+            let selector = try FuzzySelector(
                 choices: lines,
                 installSignalHandlers: self.installSignalHandlers,
                 matchCaseSensitivity: self.caseSensitivity.matchCaseSensitivity,
                 multipleSelection: self.multipleSelection,
                 reverse: self.reverse
             )
-        else {
-            return
+            choices = try await selector.run()
+        } catch {
+            FileHandle.standardError.write(Data("Error: \(error)\n".utf8))
+            throw ExitCode(1)
         }
-        let choices = try await selector.run()
 
         for choice in choices {
             print(choice)

Sources/FuzzyTUI/FuzzySelector.swift

@@ -448,30 +448,27 @@ public final class FuzzySelector<T: Selectable, E: Error, Seq> where Seq: AsyncS
     private let viewState: ViewState<T>
 
     /// Initialize a `FuzzySelector`.
-    public init?(
+    public init(
         choices: Seq,
         appearance: Appearance? = nil,
         installSignalHandlers: Bool = true,
         matchCaseSensitivity: MatchCaseSensitivity? = nil,
         multipleSelection: Bool = true,
         reverse: Bool = true
-    ) {
+    ) throws {
         let appearance = appearance ?? .default
         guard let terminalSize = TerminalSize.current() else {
-            // TODO: error
-            return nil
+            throw TerminalError(message: "Failed to read terminal size")
         }
         let ttyHandle = FileHandle(forReadingAtPath: "/dev/tty")!
         guard let tty = TTY(fileHandle: ttyHandle) else {
-            // TODO: error
-            return nil
+            throw TerminalError(message: "Input not a TTY")
         }
 
         guard let outTTYHandle = FileHandle(forWritingAtPath: "/dev/tty"),
             let outTTY = OutTTY(fileHandle: outTTYHandle)
         else {
-            // TODO: error
-            return nil
+            throw TerminalError(message: "Output not a TTY")
         }
 
         let viewState = ViewState(
@@ -666,3 +663,7 @@ public final class FuzzySelector<T: Selectable, E: Error, Seq> where Seq: AsyncS
         self.view.showStatus()
     }
 }
+
+public struct TerminalError: Error {
+    public let message: String
+}