Generate links when diary & wiki dir are the same

When generating links, we first check that the file is not a diary file
as we don't want to include those in the list. That work is delegated to
the `is_diary_file` function. Prior to this change, the function always
returned true if the file was in the diary directory.
This approach gives false positives for a wiki which has a flat structure
and the wiki files and diary files share a directory. eg:

let wiki.diary_rel_path = './'

This change reuses existing diary functions from the diary.vim module to
get an exact list of diary files to check against.

autoload/vimwiki/base.vim

@@ -391,9 +391,11 @@ function! vimwiki#base#generate_links(create) abort
     call sort(links)
 
     let bullet = repeat(' ', vimwiki#lst#get_list_margin()) . vimwiki#lst#default_symbol().' '
+    let l:diary_file_paths = vimwiki#diary#get_diary_files()
+
     for link in links
       let link_infos = vimwiki#base#resolve_link(link)
-      if !vimwiki#base#is_diary_file(link_infos.filename)
+      if !vimwiki#base#is_diary_file(link_infos.filename, copy(l:diary_file_paths))
         if vimwiki#vars#get_wikilocal('syntax') ==# 'markdown'
           let link_tpl = vimwiki#vars#get_syntaxlocal('Weblink1Template')
         else
@@ -2133,12 +2135,15 @@ function! s:clean_url(url) abort
   return join(url_l, ' ')
 endfunction
 
-
-function! vimwiki#base#is_diary_file(filename) abort
-  let file_path = vimwiki#path#path_norm(a:filename)
-  let rel_path = vimwiki#vars#get_wikilocal('diary_rel_path')
-  let diary_path = vimwiki#path#path_norm(vimwiki#vars#get_wikilocal('path') . rel_path)
-  return rel_path !=? '' && file_path =~# '^'.vimwiki#u#escape(diary_path)
+" An optional second argument allows you to pass in a list of diary files rather
+" than generating a list on each call to the function.
+function! vimwiki#base#is_diary_file(filename, ...) abort
+  let l:diary_file_paths = a:0 > 0 ? a:1 : vimwiki#diary#get_diary_files()
+  let l:normalised_file_paths =
+        \ map(l:diary_file_paths, {_, path -> vimwiki#path#normalize(path)})
+  let l:matching_files =
+        \ filter(l:normalised_file_paths, {index, file -> file =~# a:filename})
+  return len(l:matching_files) > 0 " filename is a diary file if match is found
 endfunction
 
 

autoload/vimwiki/diary.vim

@@ -44,7 +44,7 @@ function! s:get_position_links(link) abort
   let idx = -1
   let links = []
   if a:link =~# '^\d\{4}-\d\d-\d\d'
-    let links = map(s:get_diary_files(), 'fnamemodify(v:val, ":t:r")')
+    let links = map(vimwiki#diary#get_diary_files(), 'fnamemodify(v:val, ":t:r")')
     " include 'today' into links
     if index(links, vimwiki#diary#diary_date_link()) == -1
       call add(links, vimwiki#diary#diary_date_link())
@@ -157,7 +157,7 @@ function! s:read_captions(files) abort
 endfunction
 
 
-function! s:get_diary_files() abort
+function! vimwiki#diary#get_diary_files() abort
   let rx = '^\d\{4}-\d\d-\d\d'
   let s_files = glob(vimwiki#vars#get_wikilocal('path').
         \ vimwiki#vars#get_wikilocal('diary_rel_path').'*'.vimwiki#vars#get_wikilocal('ext'))
@@ -201,7 +201,6 @@ function! s:sort(lst) abort
   endif
 endfunction
 
-
 " The given wiki number a:wnum is 1 for the first wiki, 2 for the second and so on. This is in
 " contrast to most other places, where counting starts with 0. When a:wnum is 0, the current wiki
 " is used.

autoload/vimwiki/path.vim

@@ -20,12 +20,11 @@ else
   endfunction
 endif
 
-
-" collapse sections like /a/b/../c to /a/c
+" collapse sections like /a/b/../c to /a/c and /a/b/./c to /a/b/c
 function! vimwiki#path#normalize(path) abort
   let path = a:path
   while 1
-    let result = substitute(path, '/[^/]\+/\.\.', '', '')
+    let result = substitute(path, '/[^/]\+/\.\.\|\./', '', '')
     if result ==# path
       break
     endif