E484: Can't open file c:\Users\username~\AppData\Local\Temp\VIo7EE2.tmp

[0xnandhi]

On Windows 10, i am facing this issue. Unable to open the temp dir for writing.

My _vimrc file:

`let $TMPDIR = "C:/Users/Balasubramanian/.vim/temp"

" initial vundle configuration.
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
"plugin installation
"vundle plugin

Plugin 'VundleVim/Vundle.vim'
Plugin 'scrooloose/nerdtree'
Plugin 'tpope/vim-surround'
Plugin 'kien/ctrlp.vim'
Plugin 'scrooloose/nerdcommenter'
Plugin 'DoxygenToolkit.vim'
"Plugin 'rip-rip/clang_complete'
Plugin 'valloric/youcompleteme'
Plugin 'brookhong/cscope.vim'
Plugin 'airblade/vim-rooter'
Plugin 'klen/python-mode'
Plugin 'nlknguyen/papercolor-theme'
Plugin 'google/vim-maktaba'
Plugin 'google/vim-codefmt'
Plugin 'google/vim-glaive'
Plugin 'flazz/vim-colorschemes'
Plugin 'altercation/vim-colors-solarized'
Plugin 'bling/vim-airline'
Plugin 'w0rp/ale'
Plugin 'cython/cython'

call vundle#end()
filetype plugin indent on
" the glaive#Install() should go after the "call vundle#end()"
call glaive#Install()
" Optional: Enable codefmt's default mappings on the = prefix.
Glaive codefmt plugin[mappings]
Glaive codefmt google_java_executable="java -jar C:/Users/Balasubramanian/.vim/bundle/vim-glaive/google-java-format-VERSION-all-deps.jar"
`

Can the community please help me ? every time i have to format the code, i am using a Visual Code to format it and i have to switch back to Vim for coding.

I have also disabled my "RealTime Scanner" , even then, get the same issue.

Thanks

[dbarnett]

You're saying this happens only when you have codefmt enabled? Hard for me to see how that would be related. If so, is there a more complete error you could paste?

[jasonwangm]

I met with the same problem and have found no method to solve this issue.

[dbarnett]

So this triggers in particular when you run :FormatCode? Are there any other error details you can provide? Does it trigger the same sort of error if you run

:call maktaba#syscall#Create(['cat']).WithStdin('').Call()

or

:call maktaba#buffer#Overwrite(1, line('$'), [])

?

[rachaeldawn]

@dbarnett
I encounter the same issue using GVim on Windows 10. Of your code snippets, the second one does work perfectly fine. I think the tmp file is either not being created correctly, or vim does not have permission to create the tmp file.

[dbarnett]

So you see the same sort of error with the first one?

How about

:echo has('job')

and

:call system(printf('cat > %s 2> %s', tempname(), tempname()), [])

?

[rachaeldawn]

@dbarnett
First one responds with 1
Second one flashes a window really quick and doesn't appear to do anything else.

If you need access to my machine, drop me a message and I'll get a TeamViewer session going. But for me it's super reproducible.

1. Install gvim
2. Setup plugins
3. :FormatCode in a TypeScript file
4. Get error

[dbarnett]

Okay, so to summarize observations so far and give you some context, the gist of this bug seems to be that:

• there's some issue on vim on Windows 10 that makes maktaba syscalls not work
• may or may not be specific to the way maktaba is invoking the syscalls
• seems to be specific to using vim job support

Sounds like you see an error with

 :call maktaba#syscall#Create(['cat']).WithStdin('').Call()

but not with

:call system(printf('cat > %s 2> %s', tempname(), tempname()), [])

(can you confirm the first one does give you a E484 error?)

I believe from the details you've given that you can temporarily work around it by disabling syscall job support when you're using Windows 10 by adding this to your .vimrc:

call maktaba#syscall#SetVimjobDisabledForTesting(1)

And then the remaining bit is to figure out whether it's a vim issue for Windows 10 or a maktaba issue.

[rachaeldawn]

Result of first call

:call maktaba#syscall#Create(['cat']).WithStdin('').Call()
Error detected while processing function maktaba#syscall#Call[3]..<SNR>112_DoSyscallCommon[16]..maktaba#function#Apply[1]..maktaba#function#Call[0]..maktaba#function#Call[13]..maktaba#syscall#DoCall:
line 5
E484: Can't open file C:\Users\<me>\AppData\Local\Temp\VIoFBAB.tmp

Second one does the flash, and no response

Third code snippet, I put in and get the same result after running :FormatCode
Error formatting file: Vim(let):E484: Can't open file C:\Users\<me>\AppData\Local\Temp\VIoCD01.tmp

[kkkk9]

I think the problem is in maktaba's usable_shell.
I also met this problem,
my solution is:

1. add two lines in your _vimrc file.

set shell=cmd
set shellcmdflag =/c

2. Then goto the ~/bundle/vim-maktaba/autoload/maktaba/syscall.vim
   change th code:

if !exists('s:usable_shell')
  let s:usable_shell = '\v^/bin/sh$'
endif

to

if !exists('s:usable_shell')
  "let s:usable_shell = '\v^/bin/sh$'
  let s:usable_shell = '\v^cmd$'
endif

Alghouth the solution is ugly, but worked for me..(Win7, Vim8)

[dbarnett]

Ah, it makes sense that /bin/sh would be problematic on Windows. I filed google/vim-maktaba#215 with my understanding of the issue and a suggested workaround based on @kkkk9's solution (can you comment there if the other 'shell' and 'shellcmdflag' overrides are actually necessary? IIUC those are vim's defaults).