ParserSettings and HelpText assume that Console.WindowWidth throws for non-Windows environments, but this is not true in more recent versions of Mono (returns 0 instead). This change will cause it to default to DefaultMaximumLength in the event that Console.WindowWidth returns 0.

Author: Branden Conley

src/CommandLine/ParserSettings.cs

@@ -35,6 +35,10 @@ public ParserSettings()
             try
             {
                 maximumDisplayWidth = Console.WindowWidth;
+                if (maximumDisplayWidth < 1)
+                {
+                    maximumDisplayWidth = DefaultMaximumLength;
+                }
             }
             catch (IOException)
             {

src/CommandLine/Text/HelpText.cs

@@ -105,6 +105,10 @@ public HelpText(SentenceBuilder sentenceBuilder, string heading, string copyrigh
             try
             {
                 maximumDisplayWidth = Console.WindowWidth;
+                if (maximumDisplayWidth < 1)
+                {
+                    maximumDisplayWidth = DefaultMaximumLength;
+                }
             }
             catch (IOException)
             {