Trigger reindentation after snippet has expanded to word in 'indentkeys'

Question

The ftplugin vimtex provides the file indent/tex.vim with following line

setlocal indentkeys+=[,(,{,),},],\&,=item,=else,=fi

'indentkeys' 'indk' string (default "0{,0},:,0#,!^F,o,O,e")
local to buffer
A list of keys that, when typed in Insert mode, cause reindenting of the current line. Only happens if 'indentexpr' isn't empty. The format is identical to 'cinkeys', see |indentkeys-format|.

Consider this list environment:

\begin{itemize}
  \item <CURSOR> 
\end{itemize} 

When you enter a newline and then a second \item, at first the cursor will be indented to the second level (sw=2)

\begin{itemize}
  \item 
    <CURSOR>
\end{itemize} 

then when you enter manually \item, the line will be reindented and you get the desired indentation

\begin{itemize}
  \item 
  \item <CURSOR>
\end{itemize} 

However, if you do the same by using the UltiSnips snippet it (from honza/vim-snippets)

snippet it "Individual item" b
\item $0
endsnippet

you end up with an unintended second level indentation of the second \item:

\begin{itemize}
  \item 
    \item <CURSOR>
\end{itemize} 

Does anyone know how to resolve this?

This has already been raised on the issue tracker of UltiSnips, but I hope to find here a wider audience for this issue. BTW https://github.com/LucHermitte/mu-template claims to support reindentation.

Answer 1

You can manually fix the indent by typing CTRL-F (this is documented at :help indentkeys-format). Thus, an autonomous solution would be to issue this key-press after snippet expansion.

global !p
def fix_indent(snip):
    vim.eval('feedkeys("\<c-f>")')
endglobal

post_expand "fix_indent(snip)"
snippet it "Individual item" b
\item $0
endsnippet