Bug#846788: neovim-runtime: man plugin breaks startup

[Ph. Marek]

Package: neovim-runtime
Version: 0.1.7-1
Severity: normal

With this version, starting nvim with a file on the cmdline is broken.

Instead of the right file being visible, all I get is an empty buffer with 
the statusbar

    man:// [-][RO]            0,0-1    Alles

at the bottom.

Using "nvim -V255/tmp/logfile" gives this explanation (sorry about the 
german texts):

    rufe function man#init_pager auf()

    Zeile 1:   " Remove all backspaced characters.
    Zeile 2:   execute 'silent keeppatterns keepjumps %substitute,.\b,,e'.(&gdefault?'':'g')
    Zeile 2: silent keeppatterns keepjumps %substitute,.\b,,eg
    Zeile 3:   if getline(1) =~# '^\s*$'
    Zeile 4:     silent keepjumps 1delete _
    Zeile 5:   else
    Zeile 6:     keepjumps 1
    Zeile 7:   endif
    Zeile 8:   " This is not perfect. See `man glDrawArraysInstanced`. Since the title is
    Zeile 9:   " all caps it is impossible to tell what the original capitilization was.
    Zeile 10:   let ref = tolower(matchstr(getline(1), '^\S\+'))
    Zeile 11:   try 
    Zeile 12:     let b:man_sect = man#extract_sect_and_name_ref(ref)[0]
    rufe function man#init_pager[12]..man#extract_sect_and_name_ref auf('')

    Zeile 1:   if a:ref[0] ==# '-' " try ':Man -pandoc' with this disabled.
    Zeile 2:     throw 'manpage name cannot start with ''-'''
    Zeile 3:   endif
    Zeile 4:   let ref = matchstr(a:ref, '[^()]\+([^()]\+)')
    Zeile 5:   if empty(ref)
    Zeile 6:     let name = matchstr(a:ref, '[^()]\+')
    Zeile 7:     if empty(name)
    Zeile 8:       throw 'manpage reference cannot contain only parentheses'
    Ausnahme geworfen: manpage reference cannot contain only parentheses
^^ Exception thrown

    function man#init_pager[12]..man#extract_sect_and_name_ref abgebrochen

    weiter in function man#init_pager

    Zeile 13:   catch
    Ausnahme gefangen: manpage reference cannot contain only parentheses

    Zeile 14:     let b:man_sect = ''
    Zeile 15:   endtry
    Ausnahme beendet: manpage reference cannot contain only parentheses

I guess that this is the reason for the interrupted startup.


Reverting neovim-runtime (alone!) back to 0.1.6-5 fixes this problem; also, 
":e #" gets me to the expected buffer.


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.8.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_AT.UTF-8, LC_CTYPE=de_AT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

-- no debconf information