fish: Command substitutions not allowed

[Monti]

Problems summary

After configure this https://github.com/yuki-yano/fzf-preview.vim#coc-extensions-2
Execute command : <Leader>f gs to search Git Status
then get this issue:

fish: Command substitutions not allowed
[[ $(git diff --cached -- 'components/Footer.js') != "" ]] && git diff --cached --color=always -- 'components/Footer.js' || [[ $(git diff -- 'components/Footer.js') != "" ]] && git diff --color=always -- 'components/Footer.js' || bat --theme=OneHalfDark --color=always --plain --number 'components/Footer.js'

I had looked into the code, it should be related to this:
.config/coc/extensions/node_modules/coc-fzf-preview/plugin/fzf_preview.vim

if !exists('g:fzf_preview_git_status_preview_command')
  let g:fzf_preview_git_status_preview_command =  '[[ $(git diff --cached -- {-1}) != "" ]] && git diff --cached --color=always -- {-1} || ' .
  \ '[[ $(git diff -- {-1}) != "" ]] && git diff --color=always -- {-1} || ' .
  \ g:fzf_preview_command
endif

Fish shell doesn't work

Expected

Interactive git integration

Environment Information

• fzf-preview version (package.json):
  "version": "2.12.8"

• OS:
  iMac (24-inch, M1, 2021)
  macOS Monterey

• Fish Shell:
  version 3.3.1

• Vim/Neovim version:
  NVIM v0.7.0-dev+1102-gf4e24f1ea
  Build type: Release
  LuaJIT 2.1.0-beta3

Provide a minimal init.vim

Plug 'tpope/vim-fugitive'
Plug 'tpope/vim-rhubarb'
Plug 'junegunn/fzf.vim' | Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'neovim/nvim-lspconfig'
Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'thinca/vim-qfreplace'

let g:coc_global_extensions = [ 
      \ 'coc-json', 'coc-html', 'coc-css', 'coc-tsserver', 
      \ 'coc-markdownlint', 
      \ 'coc-pyright',
      \ 'coc-webview', 'coc-markdown-preview-enhanced',
      \ 'coc-prettier', 'coc-eslint', 'coc-tslint', 'coc-stylelint',
      \ 'coc-diagnostic',
      \ 'coc-snippets',
      \ 'coc-emmet',
      \ 'coc-git',
      \ 'coc-fzf-preview'
      \ ]
let g:fzf_preview_if_binary_command = "string match 'binary' (file --mime {})"

nmap <Leader>f [fzf-p]
xmap <Leader>f [fzf-p]

nnoremap <silent> [fzf-p]p     :<C-u>CocCommand fzf-preview.FromResources project_mru git<CR>
nnoremap <silent> [fzf-p]gs    :<C-u>CocCommand fzf-preview.GitStatus<CR>
nnoremap <silent> [fzf-p]ga    :<C-u>CocCommand fzf-preview.GitActions<CR>
nnoremap <silent> [fzf-p]b     :<C-u>CocCommand fzf-preview.Buffers<CR>
nnoremap <silent> [fzf-p]B     :<C-u>CocCommand fzf-preview.AllBuffers<CR>
nnoremap <silent> [fzf-p]o     :<C-u>CocCommand fzf-preview.FromResources buffer project_mru<CR>
nnoremap <silent> [fzf-p]<C-o> :<C-u>CocCommand fzf-preview.Jumps<CR>
nnoremap <silent> [fzf-p]g;    :<C-u>CocCommand fzf-preview.Changes<CR>
nnoremap <silent> [fzf-p]/     :<C-u>CocCommand fzf-preview.Lines --add-fzf-arg=--no-sort --add-fzf-arg=--query="'"<CR>
nnoremap <silent> [fzf-p]*     :<C-u>CocCommand fzf-preview.Lines --add-fzf-arg=--no-sort --add-fzf-arg=--query="'<C-r>=expand('<cword>')<CR>"<CR>
nnoremap          [fzf-p]gr    :<C-u>CocCommand fzf-preview.ProjectGrep<Space>
xnoremap          [fzf-p]gr    "sy:CocCommand   fzf-preview.ProjectGrep<Space>-F<Space>"<C-r>=substitute(substitute(@s, '\n', '', 'g'), '/', '\\/', 'g')<CR>"
nnoremap <silent> [fzf-p]t     :<C-u>CocCommand fzf-preview.BufferTags<CR>
nnoremap <silent> [fzf-p]q     :<C-u>CocCommand fzf-preview.QuickFix<CR>
nnoremap <silent> [fzf-p]l     :<C-u>CocCommand fzf-preview.LocationList<CR>

Screenshot

Fish shell doesn't work

[jinzhongjia]

me too