dotfiles/nvim/init.vim

" Specify a directory for plugins (for Neovim: ~/.local/share/nvim/plugged)
call plug#begin('~/.config/nvim/plugged')

" Automatically match structures as you type
Plug 'tpope/vim-endwise'
" Tab completion
Plug 'ervandew/supertab'
" EasyMotion - Allows <leader><leader>(b|e) to jump to (b)eginning or (end)
" of words.
Plug 'easymotion/vim-easymotion'
" Fuzzy file search
Plug 'lotabout/skim', { 'dir': '~/.skim', 'do': './install' }
Plug 'lotabout/skim.vim'
" Remove extraneous whitespace when edit mode is exited
Plug 'thirtythreeforty/lessspace.vim'
" Status bar mods
Plug 'bling/vim-airline'
Plug 'airblade/vim-gitgutter'
" Manage Project sessions
Plug 'tpope/vim-obsession'
Plug 'dhruvasagar/vim-prosession'
" Explore filesystem
Plug 'scrooloose/nerdtree'
" Commenter
Plug 'scrooloose/nerdcommenter'
" Theme
Plug 'sickill/vim-monokai'
" Autoload and read from dish if file changes
Plug 'tmux-plugins/vim-tmux-focus-events'
Plug 'wellle/tmux-complete.vim'
" For LaTeX support
Plug 'lervag/vimtex'
" For git support
Plug 'tpope/vim-fugitive'
Plug 'junegunn/gv.vim'
Plug 'rhysd/git-messenger.vim'
Plug 'sodapopcan/vim-twiggy'
Plug 'christoomey/vim-conflicted'
Plug 'rbong/vim-flog'
" For tmux yank
Plug 'vim-utils/vim-husk'
" Tags
Plug 'ludovicchabant/vim-gutentags'
Plug 'deoplete-plugins/deoplete-tag'
" GDB
Plug 'sakhnik/nvim-gdb', { 'do': ':UpdateRemotePlugins' }
" Lisp
Plug 'guns/vim-sexp'
Plug 'tpope/vim-sexp-mappings-for-regular-people'
Plug 'junegunn/rainbow_parentheses.vim'
Plug 'Olical/vim-scheme', { 'for': 'scheme', 'on': 'SchemeConnect' }
" Haskell
Plug 'ekmett/haskell-vim', { 'for': [ 'haskell', 'cabal' ] }
Plug 'neomake/neomake'
Plug 'ndmitchell/ghcid', { 'rtp': 'plugins/nvim' }
Plug 'Twinside/vim-hoogle'
Plug 'hspec/hspec.vim'
" For Nix
Plug 'LnL7/vim-nix', { 'for': 'nix' }
" For autocompletion
Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
" For Python
Plug 'zchee/deoplete-jedi'
Plug 'numirias/semshi', { 'do': ':UpdateRemotePlugins' }
" Autocomplete for Rust
Plug 'sebastianmarkow/deoplete-rust'
Plug 'cespare/vim-toml', { 'for': 'rust' }
Plug 'rust-lang/rust.vim', { 'for': 'rust' }
Plug 'mhinz/vim-crates'
" Erlang Support
Plug 'vim-erlang/vim-erlang-tags'
Plug 'vim-erlang/vim-erlang-runtime'
Plug 'vim-erlang/vim-erlang-omnicomplete'
Plug 'vim-erlang/vim-erlang-compiler'
" Miscellaneous
Plug 'tpope/vim-surround'
Plug 'tpope/vim-repeat'
Plug 'editorconfig/editorconfig-vim'
Plug 'tpope/vim-eunuch'
Plug 'vim-utils/vim-man'
Plug 'unblevable/quick-scope'
Plug 'igankevich/mesonic'
Plug 'rhysd/vim-clang-format', { 'for': [ 'c', 'cpp'] }
Plug 'pelodelfuego/vim-swoop'
Plug 'adelarsq/vim-matchit'
Plug 'stefandtw/quickfix-reflector.vim'

" Initialize plugin system
call plug#end()

syntax on
filetype plugin indent on

" Set up leaders
let mapleader="\<SPACE>"

set colorcolumn=80      " Highlight 80th column
set laststatus=2        " Always show status bar
set updatetime=500      " Let plugins show effects after 500ms
set mouse-=a            " Disable mouse click to go to position
set encoding=utf-8
set exrc                " Allow loading local .nvimrc files
set secure              " Disallow use of autocmd, shell and write in local rc
set showcmd             " Show (partial) command in status line.
set showmatch           " Show matching brackets.
set showmode            " Show current mode.
set ruler               " Show the line and column numbers of the cursor.
set number              " Show the line numbers on the left side.
set formatoptions+=o    " Continue comment marker in new lines.
set formatoptions+=j    " Delete comment character when joining commented lines
set textwidth=0         " Hard-wrap long lines as you type them.
set softtabstop=4       " Finetunes the amount of white space to be added.
set tabstop=4           " Render TABs using this many spaces.
set shiftwidth=4        " Indentation amount for < and > commands.
set smarttab            " Indent with tabs, align with spaces.
set expandtab           " When on, uses space instead of tabs.
set noerrorbells        " No beeps.
set modeline            " Enable modeline.
set linespace=0         " Set line-spacing to minimum.
set nojoinspaces        " Prevents inserting two spaces after punctuation on a join (J)
set splitbelow          " Horizontal split below current.
set splitright          " Vertical split to right of current.
set nobackup            " no backup files
set nowritebackup       " only in case you don't want a backup file while editing
set noswapfile          " no swap files
set wildoptions=pum
set pumblend=30

if !&scrolloff
  set scrolloff=3       " Show next 3 lines while scrolling.
endif
if !&sidescrolloff
  set sidescrolloff=5   " Show next 5 columns while side-scrolling.
endif
set nostartofline       " Do not jump to first character with page commands.

set ignorecase          " Make searching case insensitive
set smartcase           " ... unless the query has capital letters.
set gdefault            " Use 'g' flag by default with :s/foo/bar/.
set magic               " Use 'magic' patterns (extended regular expressions).
set autoread            " Autoload file if it changes on disk
set termguicolors       " Enable colors for terminal
set fileformat=unix

set clipboard^=unnamed,unnamedplus
set completeopt=menuone,noselect,preview,noinsert

" Theme
syntax enable
colorscheme monokai

" Use <C-L> to clear the highlighting of :set hlsearch.
if maparg('<C-L>', 'n') ==# ''
  nnoremap <silent> <C-L> :nohlsearch<CR><C-L>
endif

" Remap escape keys to something usable on home row
inoremap jk <Esc>
cnoremap jk <C-C>
inoremap <Esc> <Nop>
cnoremap <Esc> <Nop>
" Use ; for commands.
nnoremap ; :
" Use Q to execute default register.
nnoremap Q <Nop>

" Plug shortcuts
nnoremap <Leader>pg :PlugUpgrade<CR>
nnoremap <Leader>pd :PlugUpdate<CR>
nnoremap <Leader>pc :PlugClean<CR>
" NerdTree
nnoremap <Leader>ee :NERDTreeVCS<CR>
nnoremap <Leader>ef :NERDTreeFind<CR>
nnoremap <Leader>eo :NERDTreeFocus<CR>
nnoremap <Leader>ec :NERDTreeClose<CR>
nnoremap <Leader>et :NERDTreeToggle<CR>
" For skim
nnoremap <Leader>vf  :Files<CR>
nnoremap <Leader>vg  :GFiles<CR>
nnoremap <Leader>vb  :Buffers<CR>
nnoremap <Leader>vL  :Lines<CR>
nnoremap <Leader>vl  :BLines<CR>
nnoremap <Leader>vt  :BTags<CR>
nnoremap <Leader>vT  :Tags<CR>
nnoremap <Leader>vc  :BCommits<CR>
nnoremap <Leader>va  :Commits<CR>
nnoremap <Leader>vch :History:<CR>
nnoremap <Leader>vsh :History/<CR>
" Use ripgrep to search for content in files
nnoremap <Leader>/ :Rg<CR>
nnoremap <Leader>b :ls<CR>:b<Space>
" Save
nnoremap <Leader>w <Esc>:w<CR>
" Search and Replace
nnoremap <Leader>sr :%s//g<Left><Left>
" Manage window splitting
nnoremap <Leader>sh  <Esc>:sp<CR>
nnoremap <Leader>sv  <Esc>:vsp<CR>
" Quit
nnoremap <Leader>x  <Esc>:x<CR>
nnoremap <Leader>q  <Esc>:q<CR>
nnoremap <Leader>qa <Esc>:qa<CR>
" Search for the word under cursor
noremap <Leader>d :exe ':Rg ' . expand('<cword>')<CR>
" Open terminal
nnoremap <Leader>te :vsp<CR> :terminal<CR>
" Tab navigation shortcuts
nnoremap <Leader>tn :bn<CR>
nnoremap <Leader>tp :bp<CR>
" Reload opened vim config file
nnoremap <Leader>vr :so %<CR>
" For git
nnoremap <Leader>gm :GitMessenger<CR>
nnoremap <Leader>gl :Glog<CR>
nnoremap <Leader>gd :Gdiffsplit<CR>
nnoremap <Leader>gs :Gstatus<CR>
nnoremap <Leader>gc :Gcommit --signoff<CR>
nnoremap <Leader>gp :Git! push<CR>
nnoremap <Leader>gu :Git! push -u
nnoremap <Leader>gr :Git! remote -v<CR>
" For gitgutter
nnoremap <Leader>ghn :GitGutterNextHunk<CR>
nnoremap <Leader>ghp :GitGutterPrevHunk<CR>
nnoremap <Leader>ghs :GitGutterStageHunk<CR>
nnoremap <Leader>ghu :GitGutterUndoHunk<CR>
nnoremap <Leader>ghr :GitGutterPreviewHunk<CR>
nnoremap <Leader>gqf :GitGutterQuickFix<CR>
nnoremap <Leader>ggf :GitGutterFold<CR>
" For Cscope
nnoremap <Leader>cr :cs reset<CR>
" For Neomake
nnoremap <Leader>nm  :Neomake<CR>
nnoremap <Leader>nc  :NeomakeClean<CR>
nnoremap <Leader>ns  :NeomakeSh
nnoremap <Leader>njl :NeomakeListJobs<CR>
nnoremap <Leader>nja :NeomakeCancelJobs<CR>
nnoremap <Leader>njc :NeomakeCancelJob

" Haskell specific
" For ghcid
nnoremap <Leader>hg  :Ghcid<CR>
nnoremap <Leader>hk  :GhcidKill<CR>
" For Hoogle
nnoremap <Leader>hc  :HoogleClose<CR>
nnoremap <Leader>ho  :exe ':Hoogle ' . expand('<cword>')<CR>
nnoremap <Leader>hi  :exe ':HoogleInfo ' . expand('<cword>')<CR>

" Quickfix
nnoremap <Leader>fn :cnext<CR>
nnoremap <Leader>fp :cprevious<CR>
nnoremap <Leader>fo :copen<CR>
nnoremap <Leader>fc :cclose<CR>

" Location
nnoremap <Leader>ffn :lnext<CR>
nnoremap <Leader>ffp :lprevious<CR>
nnoremap <Leader>ffo :lopen<CR>
nnoremap <Leader>ffc :lclose<CR>

" Key Bindings to help with terminal mode
:tnoremap jk <C-\><C-n>
" Key bindings to move between window splits
nnoremap gh <C-w>h
nnoremap gj <C-w>j
nnoremap gk <C-w>k
nnoremap gl <C-w>l

" Disable Arrow Keys
inoremap  <Up>     <NOP>
inoremap  <Down>   <NOP>
inoremap  <Left>   <NOP>
inoremap  <Right>  <NOP>
noremap   <Up>     <NOP>
noremap   <Down>   <NOP>
noremap   <Left>   <NOP>
noremap   <Right>  <NOP>

augroup deopleteMaps
  au!
  " For deoplete Rust
  au FileType rust nmap <buffer> <Leader>rd <plug>DeopleteRustGoToDefinitionDefault
  au FileType rust nmap <buffer> <Leader>rc <plug>DeopleteRustShowDocumentation
  au FileType rust nmap <buffer> <Leader>rv <plug>DeopleteRustGoToDefinitionVSplit
  au FileType rust nmap <buffer> <Leader>rh <plug>DeopleteRustGoToDefinitionSplit
  au FileType rust nmap <buffer> <Leader>rt <plug>DeopleteRustGoToDefinitionTab
augroup END

augroup rainbow_lisp
  autocmd!
  autocmd FileType lisp,clojure,scheme RainbowParentheses
augroup END

" Starts the REPL.
autocmd FileType scheme nnoremap <buffer> <Leader>rc :SchemeConnect<cr>
" Evaluates the outer most / top level form and jumps the cursor back to where it was.
autocmd FileType scheme nnoremap <buffer> <Leader>re :normal mscpaF<cr>`s
" Evaluates the entire file.
autocmd FileType scheme nnoremap <buffer> <Leader>rf :normal msggcpG<cr>`s

let g:haskell_enable_quantification = 1   " to enable highlighting of `forall`
let g:haskell_enable_recursivedo = 1      " to enable highlighting of `mdo` and `rec`
let g:haskell_enable_arrowsyntax = 1      " to enable highlighting of `proc`
let g:haskell_enable_pattern_synonyms = 1 " to enable highlighting of `pattern`
let g:haskell_enable_typeroles = 1        " to enable highlighting of type roles
let g:haskell_enable_static_pointers = 1  " to enable highlighting of `static`
let g:haskell_backpack = 1                " to enable highlighting of backpack keywords

let g:haskell_classic_highlighting = 0
let g:haskell_indent_if = 3
let g:haskell_indent_case = 2
let g:haskell_indent_let = 4
let g:haskell_indent_where = 6
let g:haskell_indent_before_where = 2
let g:haskell_indent_after_bare_where = 2
let g:haskell_indent_do = 3
let g:haskell_indent_in = 1
let g:haskell_indent_guard = 2
let g:haskell_indent_case_alternative = 1
let g:cabal_indent_section = 2
let g:ghcid_command = 'stack exec -- ghcid'
let g:hoogle_search_bin = 'stack exec -- hoogle'
let g:hoogle_search_count = 30

" Use deoplete
let g:deoplete#enable_at_startup = 1
" Disable autocomplete by default
" let b:deoplete_disable_auto_complete = 1
" let g:deoplete_disable_auto_complete = 1
" Let sources be empty by default
let g:deoplete#sources = {}
" Disable the candidates in Comment/String syntaxes.
call deoplete#custom#source('_',
            \ 'disabled_syntaxes', ['Comment', 'String'])
call deoplete#custom#option('sources', {
    \ '_' : ['buffer', 'tag'],
    \ 'rust': ['racer'],
\})
let g:deoplete#sources#rust#disable_keymap = 1
let g:deoplete#sources#rust#racer_binary=expand('$HOME/.cargo/bin/racer')
let g:deoplete#sources#rust#rust_source_path=expand('$HOME/GitSources/rust/src')
" Required by Semshi
let g:deoplete#auto_complete_delay = 100

" Use airline
let g:airline#extensions#tabline#enabled = 2
let g:airline#extensions#tabline#fnamemod = ':t'
let g:airline#extensions#tabline#left_sep = ' '
let g:airline#extensions#tabline#left_alt_sep = '|'
let g:airline#extensions#tabline#right_sep = ' '
let g:airline#extensions#tabline#right_alt_sep = '|'
let g:airline_left_sep = ' '
let g:airline_left_alt_sep = '|'
let g:airline_right_sep = ' '
let g:airline_right_alt_sep = '|'
let g:airline#extensions#tabline#buffer_nr_show = 1

" Let vim-gitgutter do its thing on large files
let g:gitgutter_max_signs=1000

" Neomake
" compile when I open a file, change text, leave insert mode, etc ...
call neomake#configure#automake({
            \ 'TextChanged': {},
            \ 'InsertLeave': {},
            \ 'BufWritePost': {},
            \ })
" When compilation is done, open the Location list or quickfix list
" Value of 2 preserves cursor position
let g:neomake_open_list = 2

" gutentags configuration
" https://www.reddit.com/r/vim/comments/d77t6j/guide_how_to_setup_ctags_with_gutentags_properly/
let g:gutentags_add_default_project_roots = 0
let g:gutentags_project_root = ['.git']
let g:gutentags_cache_dir = expand('$HOME/.vim/tags/')

let g:gutentags_generate_on_new = 1
let g:gutentags_generate_on_missing = 1
let g:gutentags_generate_on_write = 1
let g:gutentags_generate_on_empty_buffer = 0

let g:gutentags_ctags_extra_args = [
      \ '--tag-relative=no',
      \ '--fields=+ailmnS',
      \ '--recurse',
      \ '--if0=yes'
      \ ]

" Automatically detect style file and apply style to formatting
let g:clang_format#detect_style_file = 1
" Additional trigger not required with deoplete
let g:tmuxcomplete#trigger = ''

" Default indentations
autocmd BufRead,BufNewFile */gst-*/*.[ch] set et sw=2
autocmd BufRead,BufNewFile */gstreamer-*/*.[ch] set et sw=2
autocmd BufRead,BufNewFile */pulseaudio/*.[ch] set et sw=4 tw=128
" Spell Checking
autocmd BufRead,BufNewFile *.md,*.txt setlocal spell spelllang=en_uk

" For swoop
let g:swoopUseDefaultKeyMap = 0
let g:swoopPatternSpaceInsertsWildcard = 0
let g:swoopAutoInsertMode = 0
let g:swoopWindowsVerticalLayout = 1

nmap <Leader>os :call Swoop()<CR>
vmap <Leader>os :call SwoopSelection()<CR>
nmap <Leader>om :call SwoopMulti()<CR>
vmap <Leader>om :call SwoopMultiSelection()<CR>

let g:vimtex_compiler_progname = 'nvr'
let g:SuperTabDefaultCompletionType = "<c-n>"

" CScope & skim integration
" Taken from https://gist.github.com/amitab/cd051f1ea23c588109c6cfcb7d1d5776
" However, the above gist has completely wrong mappings
function! Cscope(option, query)
  let color = '{ x = $1; $1 = ""; z = $3; $3 = ""; printf "\033[34m%s\033[0m:\033[31m%s\033[0m\011\033[37m%s\033[0m\n", x,z,$0; }'
  let opts = {
  \ 'source':  "cscope -dL" . a:option . " " . a:query . " | awk '" . color . "'",
  \ 'options': ['--ansi', '--prompt', '> ',
  \             '--multi', '--bind', 'alt-a:select-all,alt-d:deselect-all',
  \             '--color', 'bw'],
  \ 'down': '40%'
  \ }
  function! opts.sink(lines)
    let data = split(a:lines)
    let file = split(data[0], ":")
    execute 'e ' . '+' . file[1] . ' ' . file[0]
  endfunction
  call skim#run(opts)
endfunction

function! CscopeQuery(option)
  call inputsave()
  if a:option == '9'
    let query = input('Assignments to: ')
  elseif a:option == '3'
    let query = input('Functions calling: ')
  elseif a:option == '2'
    let query = input('Functions called by: ')
  elseif a:option == '6'
    let query = input('Egrep: ')
  elseif a:option == '7'
    let query = input('File: ')
  elseif a:option == '1'
    let query = input('Definition: ')
  elseif a:option == '8'
    let query = input('Files #including: ')
  elseif a:option == '0'
    let query = input('C Symbol: ')
  elseif a:option == '4'
    let query = input('Text: ')
  else
    echo "Invalid option!"
    return
  endif
  call inputrestore()
  if query != ""
    call Cscope(a:option, query)
  else
    echom "Cancelled Search!"
  endif
endfunction

nnoremap <silent> <Leader>ss :call Cscope('0', expand('<cword>'))<CR>
nnoremap <silent> <Leader>sg :call Cscope('1', expand('<cword>'))<CR>
nnoremap <silent> <Leader>sd :call Cscope('2', expand('<cword>'))<CR>
nnoremap <silent> <Leader>sc :call Cscope('3', expand('<cword>'))<CR>
nnoremap <silent> <Leader>st :call Cscope('4', expand('<cword>'))<CR>
nnoremap <silent> <Leader>se :call Cscope('6', expand('<cword>'))<CR>
nnoremap <silent> <Leader>sf :call Cscope('7', expand('<cword>'))<CR>
nnoremap <silent> <Leader>si :call Cscope('8', expand('<cword>'))<CR>
nnoremap <silent> <Leader>sa :call Cscope('9', expand('<cword>'))<CR>

nnoremap <silent> <Leader><Leader>ss :call CscopeQuery('0')<CR>
nnoremap <silent> <Leader><Leader>sg :call CscopeQuery('1')<CR>
nnoremap <silent> <Leader><Leader>sd :call CscopeQuery('2')<CR>
nnoremap <silent> <Leader><Leader>sc :call CscopeQuery('3')<CR>
nnoremap <silent> <Leader><Leader>st :call CscopeQuery('4')<CR>
nnoremap <silent> <Leader><Leader>se :call CscopeQuery('6')<CR>
nnoremap <silent> <Leader><Leader>sf :call CscopeQuery('7')<CR>
nnoremap <silent> <Leader><Leader>si :call CscopeQuery('8')<CR>
nnoremap <silent> <Leader><Leader>sa :call CscopeQuery('9')<CR>

" Adapted from https://www.reddit.com/r/neovim/comments/djmehv/im_probably_really_late_to_the_party_but_fzf_in_a/
let g:skim_layout = { 'window': 'call FloatingSkim()' }

function! FloatingSkim()
  let buf = nvim_create_buf(v:false, v:true)
  call setbufvar(buf, '&signcolumn', 'no')

  let height = float2nr(&lines * 0.4)
  let width = float2nr(&columns * 0.8)
  let horizontal = float2nr((&columns - width) / 2)
  let vertical = float2nr((&columns - width) / 2)

  let opts = {
        \ 'relative': 'editor',
        \ 'row': vertical,
        \ 'col': horizontal,
        \ 'width': width,
        \ 'height': height,
        \ 'style': 'minimal'
        \ }

  call nvim_open_win(buf, v:true, opts)
endfunction