continued refactoring, added more tests, better error handling

tablizer.pod

@@ -10,12 +10,12 @@ tablizer - Manipulate tabular output of other programs
     Flags:
       -c, --columns string     Only show the speficied columns (separated by ,)
       -d, --debug              Enable debugging
-      -X, --extended           Enable extended output
       -h, --help               help for tablizer
-      -M, --markdown           Enable markdown table output
       -n, --no-numbering       Disable header numbering
-      -O, --orgtbl             Enable org-mode table output
       -o, --output string      Output mode - one of: orgtbl, markdown, extended, ascii(default)
+      -X, --extended           Enable extended output
+      -M, --markdown           Enable markdown table output
+      -O, --orgtbl             Enable org-mode table output
       -s, --separator string   Custom field separator
       -v, --version            Print program version
 
@@ -71,9 +71,14 @@ the original order.
 
 The numbering can be suppressed by using the B<-n> option.
 
+Finally the  B<-d> option  enables debugging  output which  is mostly
+usefull for the developer.
+
+?head2 OUTPUT MODES
+
 There might be cases  when the tabular output of a  program is way too
 large  for your  current  terminal but  you still  need  to see  every
-column.  In  such cases  the B<-X>  option (or  B<-o extended>  can be
+column.   In such  cases the  B<-o extended>  or B<-X>  option can  be
 usefull which enables I<extended mode>. In this mode, each row will be
 printed vertically,  header left,  value right,  aligned by  the field
 widths. Here's an example:
@@ -88,12 +93,9 @@ widths. Here's an example:
 You can  of course  still use  a regex  to reduce  the number  of rows
 displayed.
 
-Beside normal  ascii mode (the  default) and extended mode  there more
-output modes available: B<orgtbl> which prints an Emacs org-mode table
-and B<markdown> which prints a Markdown table.
-
-Finally the  B<-d> option  enables debugging  output which  is mostly
-usefull for the developer.
+Beside normal  ascii mode  (the default) and  extended mode  there are
+more output modes available: B<orgtbl>  which prints an Emacs org-mode
+table and B<markdown> which prints a Markdown table.
 
 =head1 BUGS