Cannot override semshi default color scheme

[kurzacz]

Hello,

I'm new to Neovim and sadly I don't understand how to change default color schemes. My init.vim config file looks as follows:

syntax on
set hls
set expandtab
set textwidth=0
set tabstop=4
set softtabstop=4
set shiftwidth=4
set autoindent
set backspace=indent,eol,start
set incsearch
set ignorecase
set ruler
set wildmenu
set smarttab
filetype indent on
filetype on
filetype plugin on

" Split navigation
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>

call plug#begin('~/.local/share/nvim/plugged')

Plug 'davidhalter/jedi-vim'

" Deoplete Jedi - auto-completion for Python
Plug 'zchee/deoplete-jedi'

Plug 'vim-airline/vim-airline'

" Code highlighting
Plug 'numirias/semshi', {'do': ':UpdateRemotePlugins'}

call plug#end()


" Code highlighting configuration
function MyCustomHighlights()
    hi semshiParameterUnused ctermfg=117 guifg=#00ff00 cterm=underline gui=underline
endfunction
autocmd FileType python call MyCustomHighlights()

What I don't understand is:

1. Do I have to put color change after call plug#end() or can I place it right after Plug 'numirias/semshi', {'do': ':UpdateRemotePlugins'}
2. What exactly I have to put in order to change some color scheme? Both tries mentioned above have brought no effect - I still see unused parameters in the old color. Do I need to somehow restart the plugin?

[oncomouse]

I had this problem, too. I fixed it by loading the hi commands outside of an autocmd. So, the last five lines of your init.vim can be changed to:

" Code highlighting configuration
hi semshiParameterUnused ctermfg=117 guifg=#00ff00 cterm=underline gui=underline

And the highlighting should change. It did for me, at least.

[kurzacz]

Unfortunately, it didn't help at first. Then I took a closer look at params ctermfg and guifg. I noticed that changing the former did the effect. I don't clearly understand concept of guifg - how it's different from ctermfg?