https://wonderwall.hatenablog.com/entry/2016/03/26/211710 左の方

https://vim-jp.org/vimdoc-ja/sign.html

[* colorscheme] :highlight SignColumn guibg=darkgrey

[* define] code:.vim :sign define piet text=>> texthl=Search

[* place] code:.vim :exe ":sign place 2 line=23 name=piet file=" . expand("%:p")

[* place] code:.vim :sign unplace 2