prefer to print to stderr for console chatter

Sources/apk/Index/ApkIndexReading.swift

@@ -45,6 +45,7 @@ public extension ApkIndex {
             }
             local = URL(filePath: repository.localName)
           case .update:
+            //FIXME: Don't call print in the lib
             print("Fetching \"\(repository.resolved)\"")
             local = try await ApkIndexDownloader.fetch(repository: repository)
           }

Sources/dpk-cli/ApkRepositoriesConfig.swift

@@ -5,6 +5,7 @@
 
 import Foundation
 import ArgumentParser
+import darwin_apk
 
 public struct ApkRepositoriesConfig {
   public let repositories: [ApkIndexRepository]
@@ -17,7 +18,7 @@ public struct ApkRepositoriesConfig {
         }
       }.reduce(into: []) { $0.append($1) }
     } catch {
-      print("Failed to read repository configurations, \(error.localizedDescription)")
+      eprint("Failed to read repository configurations, \(error.localizedDescription)")
       throw .failure
     }
   }

Sources/dpk-cli/RegexMatcher.swift

@@ -13,7 +13,7 @@ struct RegexMatcher: PatternMatcher {
     do {
       self._patterns = try patterns.map(Regex.init)
     } catch {
-      print("Bad pattern \(error.localizedDescription)")
+      eprint("Bad pattern \(error.localizedDescription)")
       throw .validationFailure
     }
   }

Sources/dpk-cli/StandardErrorPrint.swift

@@ -0,0 +1,17 @@
+/*
+ * darwin-apk © 2024 Gay Pizza Specifications
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import Foundation
+
+internal func eprint(_ items: Any..., separator: String = " ", terminator: String = "\n") {
+  var stderr = FileHandle.standardError
+  print(items, separator: separator, terminator: terminator, to: &stderr)
+}
+
+extension FileHandle: @retroactive TextOutputStream {
+  public func write(_ string: String) {
+    self.write(Data(string.utf8))
+  }
+}

Sources/dpk-cli/Subcommands/DpkInstallCommand.swift

@@ -15,6 +15,6 @@ struct DpkInstallCommand: ParsableCommand {
   var packages: [String]
 
   func run() throws {
-    print("installing \"\(packages.joined(separator: "\", \""))\"")
+    eprint("installing \"\(packages.joined(separator: "\", \""))\"")
   }
 }

Sources/dpk-cli/Subcommands/DpkRemoveCommand.swift

@@ -15,6 +15,6 @@ struct DpkRemoveCommand: ParsableCommand {
   var packages: [String]
 
   func run() throws {
-    print("uninstalling \"\(packages.joined(separator: "\", \""))\"")
+    eprint("uninstalling \"\(packages.joined(separator: "\", \""))\"")
   }
 }

Sources/dpk-cli/Subcommands/DpkSearchCommand.swift

@@ -27,7 +27,7 @@ struct DpkSearchCommand: AsyncParsableCommand {
 
   func run() async throws(ExitCode) {
     if self.regex && self.exact {
-      print("Only one of \(self._regex.description) and \(self._exact.description) is allowed")
+      eprint("Only one of \(self._regex.description) and \(self._exact.description) is allowed")
       throw .validationFailure
     }
 
@@ -46,7 +46,7 @@ struct DpkSearchCommand: AsyncParsableCommand {
     do {
       index = try await ApkIndex.resolve(localRepositories, fetch: .local)
     } catch {
-      print("Failed to build package index: \(error.localizedDescription)")
+      eprint("Failed to build package index: \(error.localizedDescription)")
       throw .failure
     }
 

Sources/dpk-cli/Subcommands/DpkUpdateCommand.swift

@@ -18,8 +18,8 @@ struct DpkUpdateCommand: AsyncParsableCommand {
 
   func run() async throws {
     let repositories = try await ApkRepositoriesConfig().repositories
-    print("Updating package repositories")
+    eprint("Updating package repositories")
     let index = try await ApkIndex.resolve(repositories, fetch: self.lazyDownload ? .lazy : .update)
-    print("Indexed \(index.packages.count) package(s)")
+    eprint("Indexed \(index.packages.count) package(s)")
   }
 }

Sources/dpk-cli/Subcommands/DpkUpgradeCommand.swift

@@ -16,9 +16,9 @@ struct DpkUpgradeCommand: ParsableCommand {
 
   func run() throws {
     if packages.isEmpty {
-      print("upgrading system")
+      eprint("upgrading system")
     } else {
-      print("upgrading invidual packages: \"\(packages.joined(separator: "\", \""))\"")
+      eprint("upgrading individual packages: \"\(packages.joined(separator: "\", \""))\"")
     }
   }
 }