helper: try $COLUMNS if getTerminalWidth() fails, before using 80

this lets the user give the terminal width instead of always defaulting
to 80 just because no terminal is detected, and should work with
terminals because termios are used first as before and 80 are fallback
if $COLUMNS no set.

Signed-off-by: Scott Mcdermott <scott@smemsh.net>

Author: smemsh

src/helper.cpp

@@ -528,6 +528,15 @@ int getTerminalWidth ()
   terminalWidth = ts.ws_col;
 #endif
 
+  if (terminalWidth == 0)
+  {
+    char *columns = getenv ("COLUMNS");
+    if (columns != NULL)
+    {
+      terminalWidth = atoi (columns);
+    }
+  }
+
   return terminalWidth > 0 ? terminalWidth : 80;
 }