Re: [vim/vim] ":join" truncates a comments " 
On 2017-12-24, Gary Johnson wrote:
> On 2017-12-24, Gary Johnson wrote:
> > On 2017-12-24, AvianY wrote:
> > > I tried it and it works as it should with both NORC and NONE.
> > 
> > For me, with NONE and with
> > 
> >     vim -u NORC --cmd "set rtp=/usr/local/share/vim/vim80" comment.xml
> > 
> > it works fine.  (My plugin dependencies prevent me from using just
> > NORC.)  However, if I run just vim with no options and execute the
> > :join on line 3, I get this:
> > 
> >   <bar/> comment -->
> > 
> > So there is something common between Dmitrii's configuration and
> > mine that causes this, but I don't know what.  I also tried this,
> > 
> >     vim -u NORC --cmd "set rtp=/usr/local/share/vim/vim80" --cmd "filetype 
> > plugin indent on" --cmd "syntax on" comment.xml
> > 
> > but it also worked fine.  Is a puzzlement.  I'll poke around some
> > more.
> 
> It happens when 'comments' is set to   
> 
>     s:<!--,m:     ,e:-->
> 
> as it is for XML files, and 'formatoptions' includes 'j'.
> 
> You can reproduce the problem this way:
> 
>     $ vim -u NONE comment.xml
>     :let comments = "s:<!--,m:     ,e:-->"
>     :set fo+=j
>     :3join
> 
> where comment.xml contains Dmitrii's example.

The problem seems to be that get_last_leader_offset(), called at the
start of skip_comment(), sees the leading spaces in line 3 as the
middle part of the three-part comment defined in 'comments' and
identifies line 3 as a comment.  Consequently, when line 4 is joined
to line 3, the comment leader of line 4 is removed.

The html filetype has the same 'comments' value and suffers the
same problem.  I also discovered that the problem occurs when the
line on which the join is executed contains spaces anywhere, not
just at the start.

I don't understand the code and all the issues involved with
handling three-part comments well enough to have a solution, though.

Regards,
Gary

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