"===============================================================================
"====================== NVIM Main Configuration File ===========================
"===============================================================================



"============================== General Setup ==================================
"===============================================================================
" This section contains seme stuff I just want in general.

inoremap jk <Esc>
" Automatic expansion of comments.
set formatoptions=rqn1
" Disable mouse.
set mouse=""
" Plain old cursor in every mode.
set guicursor=

" Don't use arrow keys unless in command mode.
inoremap <Up> <Nop>
inoremap <Down> <Nop>
inoremap <Left> <Nop>
inoremap <Right> <Nop>
nnoremap <Up> <Nop>
nnoremap <Down> <Nop>
nnoremap <Left> <Nop>
nnoremap <Right> <Nop>
vnoremap <Up> <Nop>
vnoremap <Down> <Nop>
vnoremap <Left> <Nop>
vnoremap <Right> <Nop>
" I disabled this, since the shell requires arrow keys...
"tnoremap <Up> <Nop> 
"tnoremap <Down> <Nop>
"tnoremap <Left> <Nop>
"tnoremap <Right> <Nop>

" Getting out of the terminal insert mode is extremely awkward.
" This mapping solves that.
tnoremap <Esc><Esc> <C-\><C-n>

" Use UTF-8, because we don't live in 1783 anymore.
set encoding=UTF-8

" Why would everything remain highlighted all the time?
set nohlsearch

" Relative numbers are great.
set number relativenumber

"====================== Code Style Related Settings ============================
"===============================================================================

" This is basically Python's recommendation.
set tabstop=4
set softtabstop=0
set shiftwidth=4
set expandtab


"===================== Filetype And Related Settings ===========================
"===============================================================================
" This section contains stuff that is related to file types.

filetype plugin on

set modeline
set modelines=10


"_______________________________________________________________________________
"========================= Installing all Plugins ==============================
"===============================================================================
" For reasons this has to been done in a single step.

call plug#begin('~/.vim/plugged')
" This is for the LSP stuff.
Plug 'neovim/nvim-lspconfig'
Plug 'anott03/nvim-lspinstall'
Plug 'nvim-lua/completion-nvim'

" Inserting unicode characters.
Plug 'chrisbra/unicode.vim'

" Color schemes.
Plug 'tomasr/molokai'
Plug 'bluz71/vim-moonfly-colors'
Plug 'bluz71/vim-nightfly-guicolors'
Plug 'sainnhe/sonokai'
Plug 'dylnmc/vulpo.vim'

" This is for snippets.
Plug 'SirVer/ultisnips'

" Treesitter seems to be a reall nice
" plugin for code highlighting.
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}

call plug#end()

"===================== Language Server Configuration ===========================
"===============================================================================
" This section sets up the language server for the languages I use.

" Run this to install pyls if you haven't yet.
"LspInstall pyls
"LspInstall bashls

" Install ccls from snap or flatpack.
lua << EOF

local nvim_lsp = require('lspconfig')

-- This basically enables autocompletion
local on_attach = function(_, bufnr)
    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
    require'completion'.on_attach()
end

-- Enable the language servers.
nvim_lsp.ccls.setup{on_attach=on_attach}
nvim_lsp.vimls.setup{on_attach=on_attach}
nvim_lsp.pyls.setup{on_attach=on_attach}
nvim_lsp.bashls.setup{on_attach=on_attach}
nvim_lsp.yamlls.setup{on_attach=on_attach}

EOF


" Highlight the problems in the code.
highlight LspDiagnosticsDefaultError guifg=BrightRed
highlight LspDiagnosticsDefaultWarning guifg=BrightYellow

" This allows to jump to the definition, and
" show some documentation respectively.
nnoremap <silent> gd <cmd>lua vim.lsp.buf.definition()<CR>
nnoremap <silent> gh <cmd>lua vim.lsp.buf.hover()<CR>

" This part sets up lsp diagnostics.
lua << EOF

vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
    vim.lsp.diagnostic.on_publish_diagnostics, {
    underline = true,
    -- This sets the spacing and the prefix, obviously.
    virtual_text = {
        spacing = 4
        , prefix = '🔙'
        }
    })

EOF

"========================= Settings For Autocompletion =========================
"===============================================================================

" This prevents vim from inserting random function heads,
" and also gives some documentation preview.
set completeopt=menuone,noinsert,noselect

" This prevents the auto-completion from 
" inserting the full method signature.
let g:completion_enable_auto_signature = 0

let g:completion_enable_snippet = 'UltiSnips'
" Use completion-nvim in every buffer
autocmd BufEnter * lua require'completion'.on_attach()

" This function and mapping is basically related
" to autocompletion as well.
" It automatically maps a single bracket to the
" GNU-style formatted bracket.
let g:AutoInsertBracket_enable = 0

function! AutoInsertBracket()
    if g:AutoInsertBracket_enable
        return "{\n}\<Esc>O"
    else
        return "{"
    endif
endfunction
inoremap <expr> { AutoInsertBracket()



"========================== A Nice Color Scheme ================================
"===============================================================================

"set background=dark
"let g:airline_theme='one'
let $NVIM_TUI_ENABLE_TRUE_COLOR=1
set termguicolors
" This is for sonokai, a rather nice
" color scheme.
"let g:sonokai_style = 'atlantis'
"let g:sonokai_enable_italic = 0
"let g:sonokai_disable_italic_comment = 0
colorscheme molokai

"=================== Settings Related to Highlighting ==========================
"===============================================================================

let g:vimsyn_embed= 'l'


"==================== Settings Related to Treesitter ===========================
"===============================================================================

" Install the language parsers.
"TSInstall python
"TSInstall c
"TSInstall cpp
"TSInstall bash