Hello Vim developers,
a question on Super User
(http://superuser.com/questions/766817/hide-non-printable-characters-in-vim/)
asks to show all non-printable (control) characters with a single
display cell. One (hacky, and arguably not perfect) way to do this is by
including all ASCII characters in 'isprint':
:set isprint=0-255
However, this yields "E474: Invalid argument". It only works by
excluding ^@ = 0 (via :set isprint=1-255). Also, other variants such as
:set isprint^=0 and :set isprint=0,1-255 and :set
isprint=<C-v><C-@>,1-255 do not work (verified up to current version
7.4.316).
The same applies to the similar 'isfname' setting, even though its
documentation (and 'isprint' refers to that, too) explicitly mentions
the number 0:
,----[ :help 'isfname' excerpt ]----
| The format of this option is a list of parts, separated with commas.
| Each part can be a single character number or a range. A range is two
| character numbers with '-' in between. A character number can be a
| decimal number between 0 and 255 or the ASCII character itself (does
| not work for digits).
`----
I see this as a bug in the :set command, or, if technical reasons
prevent the use of ^@ in those option values, a bug in the
documentation. (Preferably, to address the issue in the mentioned
question, the first. :-)
-- regards, ingo
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