Error on startup (not the intended warning) when g:tex_flavor is not set

[danielwe]

Issue

Since f78a0bd, vimtex throws the following error when vim starts and 'g:tex_flavor' is not set:

Error detected while processing /home/username/.vim/plugged/vimtex/plugin/vimtex.vim[12]..function vimtex#log#warning[1]..10[13]..vimtex#debug#stacktrace:
line   44:
E684: list index out of range: 1
E116: Invalid arguments for function matchstr( vimtex#util#command('verbose function ' . l:func_name)[1], v:lang[0:1] ==# 'en'   ? 'Last set from \zs.*\.vim' : '\f\+\.vim')

The problem arises when vimtex#log#warning is called in plugin/vimtex.vim. Eventually a manual stacktrace is created, but the top-level item in v:throwpoint is just the filename /home/username/.vim/plugged/vimtex/plugin/vimtex.vim, which is not properly handled by the logic in vimtex#debug#stacktrace: The call to vimtex#util#command on line 52 in autoload/vimtex/debug.vim returns an empty list, and the error is thrown when trying to access its second element.

To reproduce, just run vim -u minimal.vim. No tex file or server needed.

minimal.vim

set nocompatible
let &runtimepath  = '~/.vim/bundle/vimtex,' . &runtimepath
let &runtimepath .= ',~/.vim/bundle/vimtex/after'
filetype plugin indent on
syntax enable

Output from VimtexInfo

System info
  OS: Ubuntu 18.04.4 LTS
  Vim version: VIM 8.2 (1-1303)
  Has clientserver: true
  Servername: VIM

[lervag]

Huh, I'm sorry to say that I can't reproduce this (tried with Vim and neovim). Still, I've tried to fix the line where the error originated. Can you test?

[danielwe]

Thanks, that fixed it. Your inability to reproduce might be a vim version issue perhaps?

[lervag]

Perhaps. I'm on Vim 8.2.814.