From 41c0d37a1346556a8bd9b28a17602546180a25b4 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Wed, 25 May 2022 16:24:13 +0900
Subject: [PATCH] Friendly error messages

---
 lib/youplot/command.rb | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/youplot/command.rb b/lib/youplot/command.rb
index 9141ab2..f06899f 100644
--- a/lib/youplot/command.rb
+++ b/lib/youplot/command.rb
@@ -63,9 +63,15 @@ module YouPlot
       # normal mode
       else
         # Sometimes the input file does not end with a newline code.
-        while (input = Kernel.gets(nil))
+        begin
+          begin
+            input = Kernel.gets(nil)
+          rescue Errno::ENOENT => e
+            warn e.message
+            next
+          end
           main(input)
-        end
+        end until input
       end
     end
 
@@ -137,6 +143,10 @@ module YouPlot
         warn 'Please try to set the correct character encoding with --encoding option.'
         warn e.backtrace.grep(/youplot/).first
         exit 1
+      rescue ArgumentError => e
+        warn 'Failed to parse the text. '
+        warn e.backtrace.grep(/youplot/).first
+        exit 1
       end
 
       data