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@Vftdan
Last active Aug 7, 2021
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NeoVim script to pretty print the file to terminal
function! s:color_to_ansi(cstr, is_bg)
let l:car=a:is_bg ? 40 : 30
let l:cdr=[]
if a:cstr[0] == '#'
let l:car+=8
let l:cdr=[2] + map(split(a:cstr[1:], '\v..\zs'), 'str2nr(v:val, 16)')
elseif a:cstr > 15
let l:car+=8
let l:cdr=[5, a:cstr]
else
let l:cstr = a:cstr
if l:cstr > 7
let l:cstr-=8
let l:car+=60
endif
let l:car+=l:cstr
endif
return [printf("\x1b[%sm", join([l:car] + l:cdr, ';')), "\x1b[m"]
endfunction
function! s:is_number(s)
return str2nr(a:s) . '' == a:s
endfunction
function! s:synID_to_ansi(synID)
let l:bga=''
let l:fga=''
let l:a=''
let l:bgs=synIDattr(a:synID, 'bg')
if !s:is_number(l:bgs)
let l:bgs=synIDattr(a:synID, 'bg#')
endif
let l:fgs=synIDattr(a:synID, 'fg')
if !s:is_number(l:fgs)
let l:fgs=synIDattr(a:synID, 'fg#')
endif
if strchars(l:bgs)
let l:bga=s:color_to_ansi(l:bgs, 1)[0]
endif
if strchars(l:fgs)
let l:fga=s:color_to_ansi(l:fgs, 0)[0]
endif
return [l:bga . l:fga . l:a, "\x1b[m"]
endfunction
function! s:buffer_to_ansi()
let l:lncnt=line('$')
let l:synreg={}
let l:alines=[]
let l:back={}
for l:i in range(1, l:lncnt)
let l:ln=getline(l:i)
let l:lnchars=split(l:ln, '\zs')
let l:lastsi=-1
let l:styleend=''
let l:aln=''
for l:j in range(1, strlen(l:ln))
let l:si=synIDtrans(synID(l:i, l:j, 1))
if l:si != l:lastsi
let l:style=[]
if !has_key(l:synreg, l:si)
let l:style=s:synID_to_ansi(l:si)
let l:synreg[l:si]=l:style
else
let l:style=l:synreg[l:si]
endif
let l:aln.=l:styleend . l:style[0] . l:ln[l:j - 1]
let l:styleend=l:style[1]
let l:lastsi=l:si
else
let l:aln.=l:ln[l:j - 1]
endif
endfor
let l:aln.=l:styleend
call insert(l:alines, l:aln)
endfor
call reverse(l:alines)
return l:alines
endfunction
call writefile(s:buffer_to_ansi(), '/dev/stdout', 'a')

Put this file into NeoVim runtimepath.

This command pretty-prints the file according to vim syntax rules and colorscheme:

  nvim --headless +'runtime! catcolored.vim' +'q!' $FILENAME

Vim implementations, that do not have --headless option would require a temp file, to output it when vim has removed the traces of its presence from the terminal.

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