Fix Renaming and HTML Exporting Issue (#1057)

On Windows.

Commits squashed from first to be committed to most recent:
* fix subdir not correct when path using `\`

* fix slice by variable value not supported in vim 7.3

* remove last '\' from path in CustomWiki2HTML

* fix CSS path in CustomWiki2HTML wrong

* remove unused confirm CustomWiki2HTML

* use ==# rather than == in shellescape html.vim

* remove "FIXME this can terminate in the middle of a path component! from
base#subdir

* update doc/vimwiki.txt

* update contributor to doc/vimwiki.txt

* add comment in html#shellescape

autoload/vimwiki/base.vim

@@ -62,12 +62,18 @@ function! vimwiki#base#subdir(path, filename) abort
     let filename = a:filename
   endif
   let idx = 0
-  "FIXME this can terminate in the middle of a path component!
-  while path[idx] ==? filename[idx]
+  let pathelement = split(path, '[/\\]') 
+  let fileelement = split(filename, '[/\\]')
+  let minlen = min([len(pathelement), len(fileelement)])
+  let p = fileelement[:]
+  while pathelement[idx] ==? fileelement[idx]
+    let p = p[1:]
     let idx = idx + 1
+    if idx == minlen
+      break
+    endif
   endwhile
 
-  let p = split(strpart(filename, idx), '[/\\]')
   let res = join(p[:-2], '/')
   if len(res) > 0
     let res = res.'/'

autoload/vimwiki/html.vim

@@ -1679,26 +1679,34 @@ function! s:use_custom_wiki2html() abort
         \ (s:file_exists(custom_wiki2html) || s:binary_exists(custom_wiki2html))
 endfunction
 
+function! s:shellescape(str) abort
+  let result = a:str
+  "" This fix CustomWiki2HTML at root dir problem in Windows
+  if result[len(result) - 1] ==# '\'
+    let result = result[:-2]
+  endif
+  return shellescape(result)
+endfunction
 
-function! vimwiki#html#CustomWiki2HTML(path, wikifile, force) abort
+function! vimwiki#html#CustomWiki2HTML(root_path, path, wikifile, force) abort
   call vimwiki#path#mkdir(a:path)
   let output = system(vimwiki#vars#get_wikilocal('custom_wiki2html'). ' '.
       \ a:force. ' '.
       \ vimwiki#vars#get_wikilocal('syntax'). ' '.
       \ strpart(vimwiki#vars#get_wikilocal('ext'), 1). ' '.
-      \ shellescape(a:path). ' '.
-      \ shellescape(a:wikifile). ' '.
-      \ shellescape(s:default_CSS_full_name(a:path)). ' '.
+      \ s:shellescape(a:path). ' '.
+      \ s:shellescape(a:wikifile). ' '.
+      \ s:shellescape(s:default_CSS_full_name(a:root_path)). ' '.
       \ (len(vimwiki#vars#get_wikilocal('template_path')) > 1 ?
-      \     shellescape(expand(vimwiki#vars#get_wikilocal('template_path'))) : '-'). ' '.
+      \     s:shellescape(expand(vimwiki#vars#get_wikilocal('template_path'))) : '-'). ' '.
       \ (len(vimwiki#vars#get_wikilocal('template_default')) > 0 ?
       \     vimwiki#vars#get_wikilocal('template_default') : '-'). ' '.
       \ (len(vimwiki#vars#get_wikilocal('template_ext')) > 0 ?
       \     vimwiki#vars#get_wikilocal('template_ext') : '-'). ' '.
       \ (len(vimwiki#vars#get_bufferlocal('subdir')) > 0 ?
-      \     shellescape(s:root_path(vimwiki#vars#get_bufferlocal('subdir'))) : '-'). ' '.
+      \     s:shellescape(s:root_path(vimwiki#vars#get_bufferlocal('subdir'))) : '-'). ' '.
       \ (len(vimwiki#vars#get_wikilocal('custom_wiki2html_args')) > 0 ?
-      \     vimwiki#vars#get_wikilocal('custom_wiki2html_args') : '-'))
+      \     vimwiki#vars#get_wikilocal('custom_wiki2html_args') : '-')) 
   " Print if non void
   if output !~? '^\s*$'
     call vimwiki#u#echo(string(output))
@@ -1850,13 +1858,14 @@ endfunction
 
 function! s:convert_file(path_html, wikifile) abort
   let done = 0
+  let root_path_html = a:path_html
   let wikifile = fnamemodify(a:wikifile, ':p')
   let path_html = expand(a:path_html).vimwiki#vars#get_bufferlocal('subdir')
   let htmlfile = fnamemodify(wikifile, ':t:r').'.html'
 
   if s:use_custom_wiki2html()
     let force = 1
-    call vimwiki#html#CustomWiki2HTML(path_html, wikifile, force)
+    call vimwiki#html#CustomWiki2HTML(root_path_html, path_html, wikifile, force)
     let done = 1
     return path_html . htmlfile
   endif

doc/vimwiki.txt

@@ -3892,6 +3892,7 @@ Contributors and their Github usernames in roughly chronological order:
     - Amit Beka (@amitbeka)
     - Yuuy Wei
     - Yifan Hu (@yhu266)
+    - Levi Rizki Saputra (@levirs565)
 
 ==============================================================================
 16. Changelog                                              *vimwiki-changelog*
@@ -3946,6 +3947,8 @@ New:~
 Changed:~
     * PR #1047: Allow to replace default mapping of VimwikiToggleListItem
     * VimwikiCheckLinks work on current wiki or on range
+    * PR #1057: Change how resolve subdir work
+      Change how shell escaping work when using CustomWiki2HTML
 
 Removed:~
 
@@ -3977,6 +3980,8 @@ Fixed:~
     * PR #959: Fix :VimwikiNextTask
     * PR #986: Fix typo in help file
     * PR #1030: Allow overwriting insert mode mappings
+    * PR #1057: Fix renaming, updating link, and exporting HTML subdir wrong
+      Fix resolve subdir return wrong path in Windows
 
 
 2.5 (2020-05-26)~