Add genrules to Example project (#19)

* Add an example GenerateDummySwiftFile genrule

This genrule actually breaks indexing! You can see SourceKit LSP tries to index the genrule itself...

[11:02:04 AM] 🟨🟫⬛️ Indexing /Users/.../sourcekit-bazel-bsp/Example/HelloWorld/GenerateDummySwiftFile
[11:02:04 AM] 🟨🟫⬛️ clang: error: no input files
[11:02:04 AM] 🟨🟫⬛️ Finished with exit code 1 in 0.00619425 seconds

I'm not sure how to fix this — any help would be appreciated, thanks!

* Update HelloWorld to use 'expand_template_rule'

Add another example that causing this indexing error to occur

[11:16:39 AM] 🟪🟩⬛️ clang: error: no input files
[11:16:39 AM] 🟨⬜️🟨 clang: error: no input files
[11:16:39 AM] 🟪🟩⬛️ Finished with exit code 1 in 0.009771333 seconds
[11:16:39 AM] 🟨⬜️🟨 Finished with exit code 1 in 0.00974475 seconds

Author: josh-arnold-1

Example/HelloWorld/BUILD

@@ -1,5 +1,6 @@
 load("@build_bazel_rules_apple//apple:ios.bzl", "ios_application", "ios_unit_test")
 load("@build_bazel_rules_swift//swift:swift.bzl", "swift_library", "swift_interop_hint")
+load("@aspect_bazel_lib//lib:expand_template.bzl", "expand_template_rule")
 
 
 swift_library(
@@ -35,11 +36,38 @@ objc_library(
     aspect_hints = [":TodoObjCSupport_hint"],
 )
 
+genrule(
+    name = "GenerateDummySwiftFile",
+    outs = [
+        "GeneratedDummy.swift",
+    ],
+    cmd = """
+cat > $@ << 'EOF'
+// This is a generated Swift file
+import Foundation
+
+struct GeneratedDummy {
+    static let message = "Hello from generated Swift file!"
+    
+    static func greet() -> String {
+        return message
+    }
+}
+EOF
+""",
+)
+
+swift_library(
+    name = "GeneratedDummy",
+    module_name = "GeneratedDummy",
+    srcs = [":GenerateDummySwiftFile"],
+)
+
 swift_library(
     name = "HelloWorldLib",
     module_name = "HelloWorldLib",
     srcs = glob(["HelloWorldLib/Sources/*.swift"]),
-    deps = [":TodoModels", ":TodoObjCSupport"],
+    deps = [":TodoModels", ":TodoObjCSupport", ":GeneratedDummy", ":ExpandedTemplate"],
 )
 
 genrule(
@@ -64,5 +92,22 @@ ios_application(
     families = ["iphone", "ipad"],
     infoplists = ["Resources/Info.plist"],
     minimum_os_version = "17.0",
-    deps = [":HelloWorldLib"],
+    deps = [":HelloWorldLib", ":GeneratedDummy"],
+)
+
+expand_template_rule(
+    name = "ExpandTemplateSwiftFile",
+    template = "template.swift.tpl",
+    out = "ExpandedTemplate.swift",
+    substitutions = {
+        "{{CLASS_NAME}}": "ExpandedTemplate",
+        "{{MESSAGE}}": "Hello from expanded template!",
+    },
 )
+
+swift_library(
+    name = "ExpandedTemplate",
+    module_name = "ExpandedTemplate", 
+    srcs = [":ExpandTemplateSwiftFile"],
+)
+

Example/HelloWorld/template.swift.tpl

@@ -0,0 +1,10 @@
+// This is a generated Swift file from template
+import Foundation
+
+struct {{CLASS_NAME}} {
+    static let message = "{{MESSAGE}}"
+    
+    static func greet() -> String {
+        return message
+    }
+} 

Example/MODULE.bazel

@@ -18,3 +18,5 @@ archive_override(
 
 
 bazel_dep(name = "apple_support", version = "1.22.1", repo_name = "build_bazel_apple_support")
+
+bazel_dep(name = "aspect_bazel_lib", version = "2.9.3")