> The option 'maxmem' ('mm') is used to set the maximum memory used for one
> buffer (in kilobytes). 'maxmemtot' is used to set the maximum memory used for
> all buffers (in kilobytes). The defaults depend on the system used. These
> are not hard limits, but tell Vim when to move text into a swap file. If you
> don't like Vim to swap to a file, set 'maxmem' and 'maxmemtot' to a very large
> value. The swap file will then only be used for recovery. If you don't want
> a swap file at all, set 'updatecount' to 0, or use the "-n" argument when
> starting Vim.
On today's systems these values are huge (4GB in my machine with 8GB of RAM
since it's set as half the available memory by default) so the limits are
never reached in practice, but Vim wastes a lot of time checking if the limit
was reached.
If the limit is reached Vim starts saving pieces of the swap file that were in
memory to the disk. Said in a different way: Vim implements its own memory
swapping mechanism. This is unnecessary and inefficient since the operating
system already virtualized the memory and will swap to the disk if programs
start using too much memory.
This change does...
1. Reduce the number of config options and need for documentation.
2. Make the code more efficient as we don't have to keep track of memory usage
nor check if the memory limits were reached to start swapping to disk every
time we need memory for buffers.
3. Simplify the code. Once `memfile.c` is simple enough it could be replaced by
actual operating system memory mapping (`mmap`, `MemoryViewOfFile`...).
This change does not prevent Vim to recover changes from swap files since the
swapping code is never triggered with the huge limits set by default.
Problem: The 'langnoremap' option leads to double negatives. And it does
not work for the last character of a mapping.
Solution: Add 'langremap' with the opposite value. Keep 'langnoremap' for
backwards compatibility. Make it work for the last character of a
mapping. Make the test work.
920694c1b6
Make the 'scrollback' option work like most other buffer-local options:
- `:set scrollback=x` sets the global and local value
- `:setglobal scrollback=x` sets only the global default
- new terminal buffers inherit the global
Normal buffers are still always -1, and :setlocal there is an error.
Closes#6337
Problem: 'formatprg' is a global option but the value may depend on the
type of buffer. (Sung Pae)
Solution: Make 'formatprg' global-local. (closesvim/vim#1380)
9be7c04e6c
Problem: When there are many errors adding them to the quickfix list takes
a long time.
Solution: Add BLN_NOOPT. Don't call buf_valid() in buf_copy_options().
Remember the last file name used. When going through the buffer
list start from the end of the list. Only call buf_valid() when
autocommands were executed.
8240433f48
Problem: It is not easy to get information about buffers, windows and
tabpages.
Solution: Add getbufinfo(), getwininfo() and gettabinfo(). (Yegappan
Lakshmanan)
b5ae48e9ff
Previously, free_oldval was set immediately on entering
did_set_string_option. However, opt_idx hadn't been adjusted to account
for diverting 'viminfo' manipulation to 'shada'.
Therefore, the code which determines whether to free the old value was
looking at the flags for 'viminfo' while the code which sets whether a
value was allocated was modifying the flags for 'shada'. This led to a
leak of any values set for 'viminfo'.
Updating free_oldval once opt_idx has been adjusted for the
'viminfo'/'shada' handling ensures the check/set values are consistent.
Closes#5698
Problem: When setting 'filetype' there is no check for a valid name.
Solution: Only allow valid characters in 'filetype', 'syntax' and 'keymap'.
d0b5138ba4
'inccommand' allows us to expand the feature to other commands, such as:
:cdo
:cfdo
:global
Also rename "IncSubstitute" highlight group to "Substitute".
Eliminate mb_init():
Set "enc_utf" and "has_mbyte" early. Eliminate "enc_unicode" and "enc_latin1like".
init_chartab() and screenalloc() are already invoked elsewhere
in the initialization process.
The EncodingChanged autocmd cannot be triggered.
At initialization, there is no spellfiles to reload
All options are accessed by passing char_u pointers around, casting the
pointer to the right pointer type for the specific option, and then
dereferencing that pointer.
This dance works fine on little-endian systems when some bool options
are int types (as in Vim) and some are bool types (as would make more
sense), but on big-endian systems *(int *)varp when varp is pointing to
a bool will read random memory.
Therefore, all boolean options must remain a consistent type and int is
currently the easiest to choose.
Originally implemented by
* Clement0
* DesbyP
* aym7
* Adrey06
* Robinhola
in #4811. Major reworkings and bug
fixes by
* bfredl
Most tests suggested by ZyX-l, suggestions for improvements by oni-link.
Problem: When 'fileformats' is set in the vimrc it applies to new buffers
but not the initial buffer.
Solution: Set 'fileformat' when starting up. (Mike Williams)
364fa5c7ec
