Support Windows (requires 0.16.10)

[janlazo]

Main PR to fix commands for Windows and use list type for options if required.
Added workarounds for commands not using list type for options such as :Helptags

fzf#shellescape is not used in this PR so shellslash is set/unset depending on the function.

• set shellslash
  • path functions such as expand and glob to avoid \"
  • shellescape commands on sh
• set noshellslash
  • shellescape commands on cmd.exe

Requirements

• fzf 0.16.10 or later versions so commands generating relative filepaths will work in both vim/neovim ([vim] Don't pipe FZF_DEFAULT_COMMAND in Windows fzf#969 and [neovim] Fix lcd when fzf job exits on Windows fzf#970)
• Cygwin utilities (sh, grep, perl, etc.) available in PATH to reduce maintenance burden
• Windows 7 or later versions
• Vim 7.4+ or Neovim 0.2+

Functions

• s:fzf (48ad1c3, supports list type for options)
• s:wrap (48ad1c3, supports list type for options)
• fzf#vim#grep (9a72951)
  • requires list type for option if prompt contains quotes or escape characters (\^")
• fzf#vim#complete
  • s:complete_trigger (da8f862)
  • fzf#vim#complete#word (f1619d4, not supported)
    • relies on /usr/share/dict/words which does not exist in Windows (no equivalent??)
  • fzf#vim#complete#path (24c6594)
    • requires set shellslash for now
    • TODO: use list type for options to resolve shellescape issues in cmd.exe
  • fzf#vim#complete#line
  • fzf#vim#complete#buffer_line
• fzf#vim#map (no fixes required)
• fzf#vim#with_preview (9535460)

Commands

• Files (48ad1c3)
• GFiles (no fixes required)
• GFiles? (7e5a6af, list type for options not required, requires sh.exe from Cygwin)
• Buffers (48ad1c3)
• Colors (no fixes required)
• Ag (a943f21)
  • depends on fzf#vim#grep
• Lines (cb86ba6)
• BLines (48ad1c3)
• Tags (7ed4abb)
• BTags (7cfbeca)
• Marks (no fixes required)
• Windows (no fixes required)
• Locate (052ec67, not supported)
  • locate requires Cygwin and is useless without indexing in Windows 7/8
  • no built-in alternative in Windows 7/8
  • need some check to enable the command for WSL users
• History (no fixes required)
• History: (no fixes required)
• History/ (no fixes required)
• Snippets (no fixes required)
• Commits (6d49ed1, requires sh.exe from Cygwin)
  • Bcommits (6d49ed1)
• Commands
• Maps (no fixes required)
• Helptags (Helptags implementation #376)
  • Resolve command for source (6858b23, 03c85fd)
    • uses sh, grep, perl, sort (requires Cygwin)
    • initial run takes about 1 minute (vimscript bottleneck?) resolved with 990834a
• Filetypes (no fixes required)

Mappings

• <plug>(fzf-complete-word) (f1619d4, not supported)

• <plug>(fzf-complete-path) (24c6594)

  • outputs absolute path in Windows

• <plug>(fzf-complete-file) (24c6594)

  • outputs absolute path in Windows

• <plug>(fzf-complete-file-ag) (24c6594)

• <plug>(fzf-complete-line)

• <plug>(fzf-complete-buffer-line)

• <plug>(fzf-maps-n) (no fixes required)

• <plug>(fzf-maps-i) (no fixes required)

• <plug>(fzf-maps-x) (no fixes required)

• <plug>(fzf-maps-o) (no fixes required)

[janlazo]

@junegunn Can the source command for :Helptags be rewritten to not use grep, perl, printf, and sort?
If not, then :Helptags requires cygwin or Git for Windows or Strawberry Perl, ... for unix utilities.

Side note:
https://github.com/junegunn/fzf.vim#why-you-should-use-fzf-on-vim should be updated about Windows support.

[janlazo]

Rebasing on master for s:get_git_root and fzf#complete

[janlazo]

@junegunn Is s:q needed outside of autoload/fzf/vim.vim? None of the commands use it anymore.

[junegunn]

No, it's a script-local function anyway.

[janlazo]

In fzf#vim#with_preview, can the preview command be wrapped in one line?
Escaping space with backslash doesn't not work in cmd.exe.

  let preview = printf(' --preview-window %s --preview "%s"\ %s\ {}',
        \ window,
        \ shellescape(s:bin.preview), window =~ 'up\|down' ? '-v' : '')

[janlazo]

@junegunn There's a FIXME comment in fzf#vim#complete about the --no-expect flag. Can you update it because of junegunn/fzf@b13fcfd? I prefer to not work around it because I need to use list type for options in fzf#vim#complete#path from autoload/fzf/vim/complete.vim

[junegunn]

I'll fix it after a new official binary release containing the commit is released.

[janlazo]

Bumping minimum required version to consider relative paths for the completer so it will be in sync with the default command(junegunn/fzf#971) and work in both vim/neovim.

[janlazo]

#418 is merged and the decision to use fzf#shellescape is incompatible with this PR which relies on sh.exe for parsing.
Work in this PR will be ported to fix #410