nvim_init.vim

" config based on awesome https://sharksforarms.dev/posts/neovim-rust/

syntax on
syntax enable
filetype plugin indent on

" Specify a directory for plugins
" - For Neovim: ~/.local/share/nvim/plugged
" - Avoid using standard Vim directory names like 'plugin'
call plug#begin('~/.local/share/nvim/plugged')
Plug 'neovim/nvim-lspconfig'
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/cmp-vsnip'
Plug 'hrsh7th/cmp-path'
Plug 'hrsh7th/cmp-buffer'
Plug 'simrat39/rust-tools.nvim'
Plug 'hrsh7th/vim-vsnip'

"Plug 'tpope/vim-sensible'
Plug 'scrooloose/nerdtree'
Plug 'rust-lang/rust.vim'
Plug 'godlygeek/tabular'
Plug 'tpope/vim-fugitive'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'
Plug 'ardagnir/united-front'
"Plug 'zah/nim.vim'
Plug 'nvim-lua/completion-nvim'
Plug 'ziglang/zig.vim'

Plug 'mhartington/oceanic-next'
call plug#end()

set background=dark

set undofile
set undodir=~/.vim/undo

" number of undo saved
set undolevels=100000

let mapleader = " "

" this will sync the unnamed register
" with the OS's clipboard
set clipboard=unnamedplus

augroup filetype_rust
    autocmd!
    autocmd BufReadPost *.rs setlocal filetype=rust
augroup END

let g:rustfmt_autosave = 1

let g:airline_theme = 'oceanicnext'

set number

map <C-t> :NERDTreeToggle<CR>

noremap <silent> <C-Left> :tabmove -1<CR>
noremap <silent> <C-Right> :tabmove +1<CR>

noremap <silent> <S-Right> :vertical resize +1<CR>
noremap <silent> <S-Left> :vertical resize -1<CR>
noremap <silent> <S-Down> :resize +1<CR>
noremap <silent> <S-Up> :resize -1<CR>

nnoremap <Right> <C-w>l
nnoremap <Left> <C-w>h
nnoremap <Up> <C-w>k
nnoremap <Down> <C-w>j

nnoremap <Tab> gt
nnoremap <S-Tab> gT


let g:airline_powerline_fonts = 1

set t_Co=256
if (has("termguicolors"))
 set termguicolors
endif
let g:oceanic_next_terminal_bold = 1
let g:oceanic_next_terminal_italic = 1
colorscheme OceanicNext

" Set completeopt to have a better completion experience
" :help completeopt
" menuone: popup even when there's only one match
" noinsert: Do not insert text until a selection is made
" noselect: Do not select, force user to select one from the menu
set completeopt=menuone,noinsert,noselect

" Avoid showing extra messages when using completion
set shortmess+=c

" Configure LSP through rust-tools.nvim plugin.
" rust-tools will configure and enable certain LSP features for us.
" See https://github.com/simrat39/rust-tools.nvim#configuration
lua <<EOF
local nvim_lsp = require'lspconfig'

local opts = {
    tools = { -- rust-tools options
        autoSetHints = true,
        hover_with_actions = true,
        inlay_hints = {
            show_parameter_hints = false,
            parameter_hints_prefix = "",
            other_hints_prefix = "",
        },
    },

    -- all the opts to send to nvim-lspconfig
    -- these override the defaults set by rust-tools.nvim
    -- see https://github.com/neovim/nvim-lspconfig/blob/master/CONFIG.md#rust_analyzer
    server = {
        -- on_attach is a callback called when the language server attachs to the buffer
        -- on_attach = on_attach,
        settings = {
            -- to enable rust-analyzer settings visit:
            -- https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/generated_config.adoc
            ["rust-analyzer"] = {
                -- enable clippy on save
                checkOnSave = {
                    command = "clippy"
                },
                cargo = {
                    features = "all"
                },
            }
        }
    },
}

require('rust-tools').setup(opts)

-- From https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#pylsp
-- Install using pipx install 'python-lsp-server[all]
require'lspconfig'.pylsp.setup{}

local lspconfig = require('lspconfig')
local on_attach = function(_, bufnr)
    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
    require('completion').on_attach()
end

local servers = {'zls'}
for _, lsp in ipairs(servers) do
    lspconfig[lsp].setup {
        on_attach = on_attach,
    }
end
EOF

" Setup Completion
" See https://github.com/hrsh7th/nvim-cmp#basic-configuration
lua <<EOF
local cmp = require'cmp'
cmp.setup({
  -- Enable LSP snippets
  snippet = {
    expand = function(args)
        vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ['<C-p>'] = cmp.mapping.select_prev_item(),
    ['<C-n>'] = cmp.mapping.select_next_item(),
    -- Add tab support
    ['<S-Tab>'] = cmp.mapping.select_prev_item(),
    ['<Tab>'] = cmp.mapping.select_next_item(),
    ['<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.Insert,
      select = true,
    })
  },

  -- Installed sources
  sources = {
    { name = 'nvim_lsp' },
    { name = 'vsnip' },
    { name = 'path' },
    { name = 'buffer' },
  },
})
EOF

" Code navigation shortcuts
nnoremap <silent> <c-]> <cmd>lua vim.lsp.buf.definition()<CR>
nnoremap <silent> K     <cmd>lua vim.lsp.buf.hover()<CR>
nnoremap <silent> gD    <cmd>lua vim.lsp.buf.implementation()<CR>
nnoremap <silent> <c-k> <cmd>lua vim.lsp.buf.signature_help()<CR>
nnoremap <silent> 1gD   <cmd>lua vim.lsp.buf.type_definition()<CR>
nnoremap <silent> gr    <cmd>lua vim.lsp.buf.references()<CR>
nnoremap <silent> g0    <cmd>lua vim.lsp.buf.document_symbol()<CR>
nnoremap <silent> gW    <cmd>lua vim.lsp.buf.workspace_symbol()<CR>
nnoremap <silent> gd    <cmd>lua vim.lsp.buf.definition()<CR>

nnoremap <silent> ga    <cmd>lua vim.lsp.buf.code_action()<CR>

" Set updatetime for CursorHold
" 300ms of no cursor movement to trigger CursorHold
set updatetime=300
" Show diagnostic popup on cursor hold
autocmd CursorHold * lua vim.diagnostic.open_float(0, {scope="line"})

" Goto previous/next diagnostic warning/error
nnoremap <silent> g[ <cmd>lua vim.diagnostic.goto_prev()<CR>
nnoremap <silent> g] <cmd>lua vim.diagnostic.goto_next()<CR>

" have a fixed column for the diagnostics to appear in
" this removes the jitter when warnings/errors flow in
set signcolumn=yes

com! FormatXML :%!python3 -c "import xml.dom.minidom, sys; print(xml.dom.minidom.parse(sys.stdin).toprettyxml())"