From f3b6192ed3b443804fe70c85be5dd837bd3aa3e0 Mon Sep 17 00:00:00 2001
From: Tony Allevato <allevato@google.com>
Date: Tue, 11 Oct 2022 10:46:45 -0700
Subject: [PATCH] Pass `SwiftFormatRules` sources as inputs to
 `generate-pipeline-plugin`.

This will cause the plug-in to only rerun when the rules files change
(without this, it was rerunning on every build).
---
 .../generate-pipeline-plugin/GeneratePipelinePlugin.swift    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Plugins/generate-pipeline-plugin/GeneratePipelinePlugin.swift b/Plugins/generate-pipeline-plugin/GeneratePipelinePlugin.swift
index d3c75f64e..457b79d27 100644
--- a/Plugins/generate-pipeline-plugin/GeneratePipelinePlugin.swift
+++ b/Plugins/generate-pipeline-plugin/GeneratePipelinePlugin.swift
@@ -49,6 +49,10 @@ struct GeneratePipelinePlugin: BuildToolPlugin {
       .appending("GeneratedSources")
       .appending(generatedSourceName)
 
+    let rulesSources =
+      (try context.package.targets(named: ["SwiftFormatRules"]).first as? SwiftSourceModuleTarget)?
+      .sourceFiles.map(\.path) ?? []
+
     return [
       .buildCommand(
         displayName: "Generating \(generatedSourceName) for \(target.name)",
@@ -61,6 +65,7 @@ struct GeneratePipelinePlugin: BuildToolPlugin {
           "--target",
           target.name,
         ],
+        inputFiles: rulesSources,
         outputFiles: [outputFile]
       )
     ]