" Language: Vim script
" Author: James Cherti
" License: MIT
" Description: A function that returns all available monospaced fonts 
"              (Linux and UNIX only).
" URL: https://www.jamescherti.com/vim-a-function-that-returns-all-available-fonts-unix-linux-only

function! FontList() abort
  let l:result = []

  if has('win32') || !has('gui_running') || !executable('fc-list')
    return l:result
  endif

  " Search for monospaced fonts (spacing=100)
  let l:fclist_output = systemlist('fc-list :spacing=100')
  let l:style_var = 'style='

  for l:fclist_line in l:fclist_output
    let l:fclist_line_items = split(l:fclist_line, ':')
    let l:font_file = l:fclist_line_items[0]

    let l:list_font_names = split(l:fclist_line_items[1], ',')
    let l:font_name = trim(l:list_font_names[0])

    if len(l:fclist_line_items) <= 2
      if index(l:result, l:font_name) ==# -1
        call add(l:result, l:font_name)
      endif
      continue
    endif

    let l:font_style = l:fclist_line_items[2]
    if l:font_style[0:len(l:style_var)-1] ==# l:style_var
      for l:font_style in split(l:font_style[len(l:style_var):], ',')
        let l:font_name = l:font_name . ' ' . trim(l:font_style)
        if index(l:result, l:font_name) ==# -1
          call add(l:result, l:font_name)
        endif
      endfor
    endif
  endfor

  return l:result
endfunctionCode language: Vim Script (vim)