From 527f5b85714bf3aee85bd2e64351c77c84533e02 Mon Sep 17 00:00:00 2001
From: Alexander Schwenn <alexander.schwenn@gmail.com>
Date: Mon, 6 Mar 2017 00:29:20 +0100
Subject: [PATCH] Print error message when json is requested for tree or single
 package info

---
 src/Composer/Command/ShowCommand.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Composer/Command/ShowCommand.php b/src/Composer/Command/ShowCommand.php
index 94f2bcabb..6a492fd80 100644
--- a/src/Composer/Command/ShowCommand.php
+++ b/src/Composer/Command/ShowCommand.php
@@ -172,6 +172,9 @@ EOT
 
         // show single package or single version
         if (($packageFilter && false === strpos($packageFilter, '*')) || !empty($package)) {
+            if ('json' === $format) {
+                $io->writeError('Format "json" is only supported for package listings, falling back to format "text"');
+            }
             if (empty($package)) {
                 list($package, $versions) = $this->getPackage($installedRepo, $repos, $input->getArgument('package'), $input->getArgument('version'));
 
@@ -214,6 +217,9 @@ EOT
 
         // show tree view if requested
         if ($input->getOption('tree')) {
+            if ('json' === $format) {
+                $io->writeError('Format "json" is only supported for package listings, falling back to format "text"');
+            }
             $rootRequires = $this->getRootRequires();
             foreach ($installedRepo->getPackages() as $package) {
                 if (in_array($package->getName(), $rootRequires, true)) {