FileDescriptor is used to buffer togheter many small writes to fewer
syscalls. if the data to write already is in a single buffer, it is
perfectly fine to just use os_write directly (which will take care of
the reverse problem: splitting a too big write into many syscalls)
Then we can just load metadata in C as a single msgpack blob. Which also
can be used directly as binarly data, instead of first unpacking all the
functions and ui_events metadata to immediately pack it again, which was
a bit of a silly walk (and one extra usecase of `msgpack_rpc_from_object`
which will get yak shaved in the next PR)
Functions like file_open_new() and file_open_fd_new() which just is a
wrapper around the real functions but with an extra xmalloc/xfree around
is an anti-pattern. If the caller really needs to allocate a
FileDescriptor as a heap object, it can do that directly.
FileDescriptor by itself is pretty much a pointer, or rather two:
the OS fd index and a pointer to a buffer. So most of the time an extra
pointer layer is just wasteful.
In the case of scriptin[curscript] in getchar.c, curscript used
to mean in practice:
N+1 open scripts when curscript>0
zero or one open scripts when curscript==0
Which means scriptin[0] had to be compared to NULL to disambiguate the
curscript=0 case.
Instead, use curscript==-1 to mean that are no script,
then all pointer comparisons dissappear and we can just use an array of
structs without extra pointers.
Remove `export` pramgas from defs headers as it causes IWYU to believe
that the definitions from the defs headers comes from main header, which
is not what we really want.
We already have an extensive suite of static analysis tools we use,
which causes a fair bit of redundancy as we get duplicate warnings. PVS
is also prone to give false warnings which creates a lot of work to
identify and disable.
Allow Include What You Use to remove unnecessary includes and only
include what is necessary. This helps with reducing compilation times
and makes it easier to visualise which dependencies are actually
required.
Work on https://github.com/neovim/neovim/issues/549, but doesn't close
it since this only works fully for .c files and not headers.
- `:write ++p foo/bar/baz.txt` should create parent directories `foo/bar/` if
they do not exist
- Note: `:foo ++…` is usually for options. No existing options have
a single-char abbreviation (presumably by design), so it's safe to
special-case `++p` here.
- Same for `writefile(…, 'foo/bar/baz.txt', 'p')`
- `BufWriteCmd` can see the ++p flag via `v:cmdarg`.
closes#19884
Problem: Giving error messages is not flexible.
Solution: Add semsg(). Change argument from "char_u *" to "char *", also
for msg() and get rid of most MSG macros. (Ozaki Kiichi, closes
vim/vim#3302) Also make emsg() accept a "char *" argument. Get rid of
an enormous number of type casts.
f9e3e09fdc
Suggested by ZyX in https://github.com/neovim/neovim/issues/6725#issuecomment-312197691 :
> There already is an exception if writing to a “device” (e.g. FIFO).
> It makes sense to ignore certain errors like ENOTSUP or EOPNOTSUPP
> since it is not something we or user can do anything about.
ref #6725
* Reading from stdin on Windows is fixed in the same way as it was in
#8267.
* The file_read function was returning without filling the
destination buffer when it was called with a non-blocking file
descriptor.
Problem: as fileio is cached and reads blocks this is going to wait
until either EOF or reading enough characters to fill rbuffer. This is
not good when reading user input from stdin as script.
According to the documentation fsync() may fail with EROFS or EINVAL if “file
descriptor is bound to a special file which does not support synchronization”
(e.g. /dev/stderr). This condition is completely valid in this case since main
point of `file_fsync()` is dumping buffered input.
