Use SwiftPM Resources rather than downloading CSS files.

Makefile

@@ -21,10 +21,12 @@ swift-doc: $(BUILDDIR)/release/swift-doc
 install: $(BUILDDIR)/release/swift-doc
 	@install -d "$(bindir)"
 	@install "$(BUILDDIR)/release/swift-doc" "$(bindir)"
+	@cp -R "$(BUILDDIR)/release/swift-doc_swift-doc.bundle" "$(bindir)"
 
 .PHONY: uninstall
 uninstall:
 	@rm -rf "$(bindir)/swift-doc"
+	@rm -rf "$(bindir)/swift-doc_swift-doc.bundle"
 
 .PHONY: clean
 distclean:

Package.swift

@@ -43,7 +43,8 @@ let package = Package(
                 .product(name: "SwiftSyntaxHighlighter", package: "SwiftSyntaxHighlighter"),
                 .product(name: "Logging", package: "swift-log"),
                 .product(name: "LoggingGitHubActions", package: "LoggingGitHubActions")
-            ]
+            ],
+            resources: [.copy("Resources")]
         ),
         .target(
             name: "DCOV",

Sources/swift-doc/Subcommands/Generate.swift

@@ -5,10 +5,6 @@ import SwiftMarkup
 import SwiftSemantics
 import struct SwiftSemantics.Protocol
 
-#if canImport(FoundationNetworking)
-import FoundationNetworking
-#endif
-
 extension SwiftDoc {
   struct Generate: ParsableCommand {
     enum Format: String, ExpressibleByArgument {
@@ -147,9 +143,10 @@ extension SwiftDoc {
         }
 
         if case .html = format {
-          let cssData = try fetchRemoteCSS()
-          let cssURL = outputDirectoryURL.appendingPathComponent("all.css")
-          try writeFile(cssData, to: cssURL)
+          let cssSrcFile = Bundle.module.url(forResource: "Resources/all", withExtension: "min.css")!
+          let cssDst = outputDirectoryURL.appendingPathComponent("all.css")
+          try? FileManager.default.removeItem(at: cssDst)
+          try FileManager.default.copyItem(at: cssSrcFile, to: cssDst)
         }
 
       } catch {
@@ -158,8 +155,3 @@ extension SwiftDoc {
     }
   }
 }
-
-func fetchRemoteCSS() throws -> Data {
-  let url = URL(string: "https://raw.githubusercontent.com/SwiftDocOrg/swift-doc/master/Resources/all.min.css")!
-  return try Data(contentsOf: url)
-}