From 344bbe18dd4d8d5cb844223e029073cade88c8e9 Mon Sep 17 00:00:00 2001
From: Tom Ball <tball@google.com>
Date: Wed, 24 Mar 2021 14:23:42 -0700
Subject: [PATCH] Adds -Xprint-args internal flag to tree_shaker, only needed
 for debugging build rules.

PiperOrigin-RevId: 364890336
---
 .../main/java/com/google/devtools/treeshaker/Options.java  | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tree_shaker/src/main/java/com/google/devtools/treeshaker/Options.java b/tree_shaker/src/main/java/com/google/devtools/treeshaker/Options.java
index 69443ebeff..40773de6c8 100644
--- a/tree_shaker/src/main/java/com/google/devtools/treeshaker/Options.java
+++ b/tree_shaker/src/main/java/com/google/devtools/treeshaker/Options.java
@@ -153,6 +153,7 @@ public static void version() {
 
   public static Options parse(String[] args) throws IOException {
     Options options = new Options();
+    boolean printArgs = false;
 
     int nArg = 0;
     while (nArg < args.length) {
@@ -204,6 +205,8 @@ public static Options parse(String[] args) throws IOException {
         version();
       } else if (arg.equals("-Werror")) {
         options.treatWarningsAsErrors = true;
+      } else if (arg.equals("-Xprint-args")) {
+        printArgs = true;
       } else if (arg.startsWith("-h") || arg.equals("--help")) {
         help(false);
       } else if (arg.startsWith("-")) {
@@ -220,6 +223,10 @@ public static Options parse(String[] args) throws IOException {
     if (options.sourceFiles.isEmpty()) {
       usage("no source files");
     }
+    if (printArgs) {
+      System.err.print("tree_shaker ");
+      System.err.println(String.join(" ", args));
+    }
 
     return options;
   }