"===============================================================================
"======================== 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=

" Use a different mapleader.
let mapleader=' '

" 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

" I user :terminal quite often.
nnoremap <leader>t :sp<Cr>:terminal<Cr>a
nnoremap <leader>T :vsp<Cr>:terminal<Cr>a

"========================= 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

autocmd BufEnter *.json set formatprg=python3\ -m\ json.tool


"_______________________________________________________________________________
"=========================== 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/lsp-status.nvim'

Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-path'
Plug 'hrsh7th/cmp-cmdline'
Plug 'hrsh7th/nvim-cmp'

Plug 'quangnguyen30192/cmp-nvim-ultisnips'

" 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'}

" This should highlight python docstrings.
Plug 'stsewd/sphinx.nvim', { 'do': ':UpdateRemotePlugins' }

" SLIME brings REPL features to VIM.
" I will try this out.
Plug 'jpalardy/vim-slime'

" This plugin should allow editing Jupyter Notebooks
" in VIM.
Plug 'szymonmaszke/vimpyter'

" Firenvim allows to use neovim as the
" firefox text editor.
Plug 'glacambre/firenvim', { 'do': { _ -> firenvim#install(0) } }

" This is a tree manager
Plug 'kyazdani42/nvim-web-devicons'
Plug 'kyazdani42/nvim-tree.lua'

" Git Gut.
Plug 'airblade/vim-gitgutter'

" Vimtex for a better TeX experience
Plug 'lervag/vimtex'

" Table mode 
Plug 'dhruvasagar/vim-table-mode'

" Snakemake 
Plug 'snakemake/snakemake', {'rtp': 'misc/vim'}
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_status = require('lsp-status')
nvim_lsp_status.register_progress()
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(_, bufnr)
    -- also attach lsp-status
    nvim_lsp_status.on_attach(_, bufnr)
end

-- Enable the language servers.
--nvim_lsp.ccls.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
nvim_lsp.clangd.setup{on_attach=on_attach
                    , capabilities=nvim_lsp_status.capabilities
                    --, flags = { debounce_text_changes = 150, }
                    }
--nvim_lsp.vimls.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
nvim_lsp.pylsp.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
nvim_lsp.bashls.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
--nvim_lsp.yamlls.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
nvim_lsp.texlab.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}
nvim_lsp.rust_analyzer.setup{on_attach=on_attach, capabilities=nvim_lsp_status.capabilities}

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> gD <cmd>lua vim.lsp.buf.declaration()<CR>
nnoremap <silent> gh <cmd>lua vim.lsp.buf.hover()<CR>
nnoremap <silent> gi <cmd>lua vim.lsp.buf.implementation()<CR>
nnoremap <silent> <leader>ca <cmd>lua vim.lsp.buf.code_action()<CR>
nnoremap <silent> <leader>rn <cmd>lua vim.lsp.buf.rename()<CR>
nnoremap <silent> [d <cmd>lua vim.lsp.diagnostic.goto_prev()<CR>
nnoremap <silent> ]d <cmd>lua vim.lsp.diagnostic.goto_next()<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
        , update_in_insert = true
        -- This sets the spacing and the prefix, obviously.
        , virtual_text = {
            spacing = 4
            , prefix = '🔙'
            }
    })

EOF
" Statusline
function! LspStatus() abort
  if luaeval('#vim.lsp.buf_get_clients() > 0')
    return luaeval("require('lsp-status').status()")
  endif

  return ''
endfunction

function MyLspStatus()
    let tmp = LspStatus()
    return tmp
endfunction

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

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

lua << EOF

local cmp = require'cmp'
cmp.setup({
    snippet = {
        expand = function(args)
            vim.fn["UltiSnips#Anon"](args.body)
        end,
    },
    mapping = {
        ['<C-n>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
        ['<C-p>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
        --['<Down>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Select }),
        --['<Up>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Select }),
        ['<C-d>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.close(),
        ['<CR>'] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Replace,
            select = true,
        }),
    },
    sources = cmp.config.sources({
        { name = 'nvim_lsp' },
        { name = 'ultisnips' },
        { name = 'buffer' },
    }),
})

--local capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())
--  -- Replace <YOUR_LSP_SERVER> with each lsp server you've enabled.
--  require('lspconfig')['<YOUR_LSP_SERVER>'].setup {
--    capabilities = capabilities
--  }

EOF



"============================ 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


lua <<EOF
require'nvim-treesitter.configs'.setup {
    highlight = {
        enable = true,
        disable = {"latex"},
    },
--    indent = {
--        enable = true,
--    },
    fold = {
        enable = true,
    },
    rainbow = {
        enable = true,
        extended_mode = true,
        max_file_lines = nil,
    },
}
EOF
set foldmethod=expr
set foldexpr=nvim_treesitter#foldexpr()


"========================== Settings Related to SLIME ==========================
"===============================================================================

let g:slime_target = 'neovim'
let g:slime_no_mappings = 1
xmap <leader>r <Plug>SlimeRegionSend
nmap <leader>r <Plug>SlimeParagraphSend

"========================== Settings Related to IPYNB ==========================
"===============================================================================
" You have to install notedown  pip3 install --user notedown.


"======================== Settings Related to Firenvim =========================
"===============================================================================

if exists('g:started_by_firenvim')
    "let g:firenvim_config['.*'] = { 'takeover': 'never' }
    imap <C-j> <C-n>
    set fileformat=dos
    colorscheme morning
    set guifont=:h9
endif


"============================= Statusline Settings =============================
"===============================================================================

set statusline=
set statusline+=%-20f\ %m%-y%-r%w%<
set statusline+=%=
set statusline+=%-30.50{MyLspStatus()}
set statusline+=r:%-5l\ c:%-4v
set laststatus=2


"========================= Settings Related to GIT GUD =========================
"===============================================================================

set updatetime=200



"================== Settings related to NVim-Tree.lua ==========================
"===============================================================================

lua <<EOF
require'nvim-tree'.setup { -- BEGIN_DEFAULT_OPTS
  --auto_close = false,
  auto_reload_on_write = true,
  disable_netrw = false,
  --hide_root_folder = false,
  hijack_cursor = false,
  hijack_netrw = true,
  hijack_unnamed_buffer_when_opening = false,
  --ignore_buffer_on_setup = false,
  --open_on_setup = false,
  open_on_tab = false,
  sort_by = "name",
  update_cwd = false,
  view = {
    width = 30,
    side = "left",
    preserve_window_proportions = false,
    number = false,
    relativenumber = false,
    signcolumn = "yes",
  },
  hijack_directories = {
    enable = true,
    auto_open = true,
  },
  update_focused_file = {
    enable = false,
    update_cwd = false,
    ignore_list = {},
  },
  --ignore_ft_on_setup = {},
  system_open = {
    cmd = nil,
    args = {},
  },
  diagnostics = {
    enable = false,
    show_on_dirs = false,
    icons = {
      hint = "",
      info = "",
      warning = "",
      error = "",
    },
  },
  filters = {
    dotfiles = false,
    custom = {},
    exclude = {},
  },
  git = {
    enable = true,
    ignore = true,
    timeout = 400,
  },
  actions = {
    change_dir = {
      enable = true,
      global = false,
    },
    open_file = {
      quit_on_open = false,
      resize_window = false,
      window_picker = {
        enable = true,
        chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890",
        exclude = {
          filetype = { "notify", "packer", "qf", "diff", "fugitive", "fugitiveblame" },
          buftype = { "nofile", "terminal", "help" },
        },
      },
    },
  },
  trash = {
    cmd = "trash",
    require_confirm = true,
  },
  log = {
    enable = false,
    truncate = false,
    types = {
      all = false,
      config = false,
      git = false,
    },
  },
} -- END_DEFAULT_OPTS
EOF