Enable Single Print when Generating Based on Swifttemplate (#1308)

* Update SwiftTemplate.swift

Enables a single point of output into STDOUT during codegen from swifttemplate

* Fixed failing tests

* Squashed commit of the following:

commit 33be2ab
Author: David Cacenabes <david.cacenabes@gmail.com>
Date:   Tue Mar 26 07:09:02 2024 +0100

    Remove Sourcery version from header (#1309)

    * Remove version from headers

    * Remove from generated files

    * Revert "Remove from generated files"

    This reverts commit 9a8c14e.

    * Revert "Remove version from headers"

    This reverts commit 93ddd54.

    * Add support to hide header via config

    * Remove redundant self

    * Make non-lazy

SourcerySwift/Sources/SwiftTemplate.swift

@@ -63,20 +63,28 @@ open class SwiftTemplate {
 
         var includedFiles: [Path] = []
         var outputFile = [String]()
+        var hasContents = false
         for command in commands {
             switch command {
             case let .includeFile(path):
                 includedFiles.append(path)
             case let .output(code):
-                outputFile.append("print(\"\\(" + code + ")\", terminator: \"\");")
+                outputFile.append("sourceryBuffer.append(\"\\(" + code + ")\");")
+                hasContents = true
             case let .controlFlow(code):
                 outputFile.append("\(code)")
+                hasContents = true
             case let .outputEncoded(code):
                 if !code.isEmpty {
-                    outputFile.append(("print(\"") + code.stringEncoded + "\", terminator: \"\");")
+                    outputFile.append(("sourceryBuffer.append(\"") + code.stringEncoded + "\");")
+                    hasContents = true
                 }
             }
         }
+        if hasContents {
+            outputFile.insert("var sourceryBuffer = \"\";", at: 0)
+        }
+        outputFile.append("print(\"\\(sourceryBuffer)\", terminator: \"\");")
 
         let contents = outputFile.joined(separator: "\n")
         let code = """
@@ -259,7 +267,6 @@ open class SwiftTemplate {
         let compilationResult = try Process.runCommand(path: "/usr/bin/env",
                                                        arguments: arguments,
                                                        currentDirectoryPath: buildDir)
-
         if compilationResult.exitCode != EXIT_SUCCESS {
             throw [compilationResult.output, compilationResult.error]
                 .filter { !$0.isEmpty }

SourceryTests/Generating/SwiftTemplateSpecs.swift

@@ -174,7 +174,7 @@ class SwiftTemplateTests: QuickSpec {
                     }
                     .to(throwError(closure: { (error) in
                         let path = Path.cleanTemporaryDir(name: "build").parent() + "SwiftTemplate/version/Sources/SwiftTemplate/main.swift"
-                        expect("\(error)").to(contain("\(path):10:11: error: missing argument for parameter #1 in call\nprint(\"\\( )\", terminator: \"\");\n          ^\n"))
+                        expect("\(error)").to(contain("\(path):11:27: error: missing argument for parameter #1 in call\nsourceryBuffer.append(\"\\( )\");\n                          ^\n"))
                     }))
             }
 
@@ -194,7 +194,7 @@ class SwiftTemplateTests: QuickSpec {
                     try Generator.generate(.init(path: nil, module: nil, types: [], functions: []), types: Types(types: []), functions: [], template: SwiftTemplate(path: templatePath))
                     }
                     .to(throwError(closure: { (error) in
-                        expect("\(error)").to(contain("\(templatePath): SwiftTemplate/main.swift:10: Fatal error: Template not implemented"))
+                        expect("\(error)").to(contain("\(templatePath): SwiftTemplate/main.swift:11: Fatal error: Template not implemented"))
                     }))
             }