Move `has_eval_provider()` check to `eval_call_provider()` to make sure that
every code path calls it first.
Previously we would, when pynvim was missing, get a nice error message for
`:python3 1`, but not for `:py3file blah`.
Fixes https://github.com/neovim/neovim/issues/9485
In Vim (and some vestigial parts of Nvim) E319 was a placeholder for
ex_ni commands, i.e. commands that are only available in certain builds
of Vim. That is obviously counter to Nvim's goals: all Nvim commands
are available on all platforms and build types (the remaining ex_ni
commands are actually just missing providers).
We need an error id for "missing provider", so it makes sense to use
E319 for that purpose.
ref #9344
ref #3577
During provider dispatch, eval_call_provider() saves global
state--including pointers, such as `autocmd_fname`--into
`provider_caller_scope` which is later restored by f_rpcrequest().
But `autocmd_fname` is special-cased in eval_vars(), for performance
(see Vim patch 7.2.021; this is also the singular purpose of the
`autocmd_fname_full` global. Yay!)
If eval_vars() frees `autocmd_fname` then its provider-RPC-scoped alias
becomes a problem.
Solution: Don't free autocmd_fname in eval_vars(), just copy into it.
closes#5245closes#5617
Reference
------------------------------------------------------------------------
Vim patch 7.2.021
f6dad43c98
Problem: When executing autocommands getting the full file name may be
slow. (David Kotchan)
Solution: Postpone calling FullName_save() until autocmd_fname is used.
vim_dev discussion (2008): "Problem with CursorMoved AutoCommand when
Editing Files on a Remote WIndows Share"
https://groups.google.com/d/msg/vim_dev/kj95weZa_eE/GTgj4aq5sIgJ
It is otherwise impossible to determine which test failed sanitizer/valgrind
check. test/functional/helpers.lua module return was changed so that tests which
do not provide after_each function to get new check will automatically fail.
Use the existing Vimscript function provider#pythonx#Detect()
to determine whether the Neovim Python module is installed and
Python 2/3 tests can be run.
