Improve glob handling for source paths and update docs

- Simplify glob handling in TailwindCSSBuildPlugin to support **
patterns - Update README and Tailwind.css example to clarify glob usage
- Add Template.swift example using Tailwind classes - Extend tests to
verify class extraction from globbed Swift files

Plugins/TailwindCSS/TailwindCSSBuildPlugin.swift

@@ -65,8 +65,10 @@ struct TailwindCSSBuildPlugin: BuildToolPlugin {
       .matches(of: sourceDeclarationRegex)
       .compactMap { String($0.output.1) }
     let sourceURLs: [URL] = sourcePaths.map { path in
-      target.directoryURL
+      // Simplified handling: If ** is used, we just include everything in the directory.
-        .appending(component: path, directoryHint: .inferFromPath)
+      let globlessPath = path.replacing(/\*\*.*/, with: "")
+      return target.directoryURL
+        .appending(component: globlessPath, directoryHint: .inferFromPath)
         .resolvingSymlinksInPath()
     }
 

README.md

@@ -29,7 +29,8 @@ Place your Tailwind CSS entrypoint file at `Tailwind.css` in your target. To int
 
 ```css
 @import "tailwindcss" source(none);
-@source "./Views";
+/* Note that as of writing, Tailwind doesn't scan .swift files by default, so you need to specify a glob pattern including the extension. */
+@source "./Views/**/*.swift";
 @source "./Template.swift";
 @source "./Static";
 ```

Sources/SwiftTailwindExample/Folder/Template.swift

@@ -0,0 +1,4 @@
+let template =
+"""
+<div class="bg-red-100">Test</div>
+"""

Sources/SwiftTailwindExample/Tailwind.css

@@ -5,3 +5,4 @@
 @import "tailwindcss" source(none);
 @source "./Example.swift";
 @source "./Folder";
+@source "./Folder/**/*.swift";

Tests/SwiftTailwindTests/Tests.swift

@@ -17,6 +17,10 @@ struct SwiftTailwindExampleTests {
       generatedCSS?.contains("text-\\[\\#f05138\\]") == true,
       "Arbitary value class used in Test.html is generated."
     )
+    #expect(
+      generatedCSS?.contains("bg-red-100") == true,
+      "Arbitary value class used in Folder/Template.swift is generated."
+    )
     #expect(
       generatedCSS?.contains("bg-blue-500") == false,
       "Class not used is not generated."