Hi all,
An occasionally-recurring annoyance when using the normal-mode command
> is that, by default, it has no effect on lines that begin with
'#'. The documentation for that command is followed by this
explanation:
If the 'smartindent' option is on, or 'cindent' is on
and 'cinkeys' contains '#', shift right does not affect
lines starting with '#' (these are supposed to be C
preprocessor lines that must stay in column 1).
This rule about '#' needing to appear in the first column to begin a C
preprocessor directive does not come from any of the ISO C (89 or 99)
or ISO C++ language rules. Instead, the ISO standards state that the
'#' that begins a preprocessor directive must be the first *non-white
space, non-horizontal-tab character* following the beginning of the
source file or following the last new-line character.
The bogus first-column rule is not even specified in the first edition
of K&R. Presumably this behavior was put in place to cope with a
preprocessor bug in some old compiler. However, ISO conformance is
pretty ubiquitous these days, so having '0#' by default in cinkeys is
now an anachronism. It should be removed because it can cramp
people's styles. For example, some people like to indent
conditionally-compiled code as in:
#ifdef A
#ifdef FOO
#define BAR 1
#else
#define BAR 2
#endif
#else
#define BAR 3
#endif /* A */
int n = BAR; /* ok */
Another example: there are lots of cases where a single macro
definition spans multiple physical lines, and some of those lines may
begin with uses of the # operator; e.g.:
#define STR( a, b ) \
#a \
#b
const char * s = STR( asdf, qwer ); /* ok */
It's quite natural to add indentation as we see in the definition of
STR(), but neither '>' nor '=' have the desired effect. I can live
with '=' not doing what I want, but '>' should at least obey. We get
that behavior with the aforementioned removal of '0#'.
James Widman
--
Gimpel Software
http://gimpel.com
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