nuwiki/autoload/vimwiki/vars.vim

" autoload/vimwiki/vars.vim — compatibility shim for plugins that depend on
" the original vimwiki API (e.g. vimwiki-sync, vim-zettel).
"
" Only the subset of `vimwiki#vars#get_wikilocal` keys that third-party
" plugins are known to call is implemented here; add entries as needed.
" Values are read from nuwiki's own config variables so users don't have
" to duplicate settings.

" Resolve which wiki a `get_wikilocal` call refers to, mirroring upstream:
"   - an explicit numeric second argument selects that wiki (0-based);
"   - otherwise the wiki owning the current buffer is used
"     (upstream's `g:vimwiki_current_idx`);
"   - failing that, the first/shorthand wiki (index 0).
function! s:resolve_index(...) abort
  if a:0 >= 1 && type(a:1) == type(0)
    return a:1
  endif
  let l:file = expand('%:p')
  if !empty(l:file)
    let l:n = 0
    for l:w in nuwiki#commands#wiki_list()
      let l:wroot = fnamemodify(expand(l:w.root), ':p')
      if l:wroot[len(l:wroot) - 1:] !=# '/' | let l:wroot .= '/' | endif
      if a:file !=# '' && l:file[: len(l:wroot) - 1] ==# l:wroot
        return l:n
      endif
      let l:n += 1
    endfor
  endif
  return 0
endfunction

" Per-wiki local config values.
"
" Supported keys:
"   path            — wiki root directory (with trailing slash)
"   is_temporary_wiki — always 0 for a configured wiki
"   ext / extension — file extension (default '.wiki')
"   syntax          — syntax name (default 'vimwiki')
"
" The optional second argument is the wiki index (upstream's signature);
" when omitted, the wiki owning the current buffer is used. Values are
" pulled from the matching `g:nuwiki_wikis` entry, falling back to the
" scalar `g:nuwiki_*` globals for keys that entry doesn't set.
function! vimwiki#vars#get_wikilocal(key, ...) abort
  if a:key ==# 'is_temporary_wiki'
    return 0
  endif

  let l:idx = call('s:resolve_index', a:000)
  let l:wikis = nuwiki#commands#wiki_list()
  if l:idx < 0 || l:idx >= len(l:wikis)
    let l:idx = 0
  endif
  let l:w = l:wikis[l:idx]

  if a:key ==# 'path'
    let l:root = expand(l:w.root)
    " Ensure trailing slash to match what the original vimwiki returns.
    return l:root =~# '/$' ? l:root : l:root . '/'

  elseif a:key ==# 'ext' || a:key ==# 'extension'
    " wiki_list() already normalises the leading dot.
    return l:w.ext

  elseif a:key ==# 'syntax'
    " wiki_list() doesn't carry `syntax`; read the per-wiki entry, then the
    " global default.
    let l:cfg = (exists('g:nuwiki_wikis') && len(g:nuwiki_wikis) > l:idx)
          \ ? g:nuwiki_wikis[l:idx] : {}
    return get(l:cfg, 'syntax', get(g:, 'nuwiki_syntax', 'vimwiki'))

  endif
  return ''
endfunction

" Global (non-wiki-specific) config values.
function! vimwiki#vars#get_global(key) abort
  return ''
endfunction