vi: remove autoindent from otherwise empty lines

Lines that have no content apart from automatic indentation should
be treated as empty when the user hits return or ESC.

The implementation uses the global variable 'indentcol'.  Usually
this is zero.  It can also be -1 to indicate an 'O' (open above)
command, replacing the overloading of the tabstop option bit.

A value greater than zero indicates that the current line has
been autoindented to the given column (or that the autoindent has
been adjusted with ctrl-D).  Any other change to the line resets
'indentcol' to zero.

Replace strspn() with ident_len().  The latter handles the unlikely
case that it's called on the last line of a file which doesn't have
a terminating newline.

function                                             old     new   delta
char_insert                                          741     912    +171
indent_len                                             -      42     +42
do_cmd                                              4781    4785      +4
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/0 up/down: 217/0)             Total: 217 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

0 files changed, 0 insertions, 0 deletions