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I believe the following script in vimrc, which try to set spellfile, has something to do with the scope of vim variable. Especially the difference of $var and g:var:
I can't figure out what's wrong with this:
let g:spelldir ='~/.vim/myvim/spell'
if !exists( 'g:spelldir' )
silent exec '!mkdir -p ' . g:spelldir
endif
au FileType tex setlocal spf= g:spelldir/en.utf-8.add
while it works if we change g:spelldir to $spelldir.
Use isdirectory not exists to check if a directory exists.
set/setlocal does not expand variables but it does (sometimes) expand environment variables, which explains what you're seeing. Use this instead:
au FileType tex exe 'setlocal spf='.g:spelldir.'/en.utf-8'
The g:spelldir is copied into the setlocal string when the FileType autocommand is triggered, then the whole string is executed. It has nothing to do with variable scope, g: is global.
