.vimrc

" Based on: https://vim.wikia.com/wiki/Example_vimrc/

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" Features
" These options and commands enable some very useful features in Vim, that
" no user should have to live without.
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" Set 'nocompatible' to ward off unexpected things that your distro might
" have made, as well as sanely reset options when re-sourcing .vimrc
set nocompatible

" Attempt to determine the type of a file based on its name and possibly its
" contents. Use this to allow intelligent auto-indenting for each filetype,
" and for plugins that are filetype specific.
if has('filetype')
  filetype indent plugin on
endif

" Enable syntax highlighting
if has('syntax')
  syntax on
endif

"------------------------------------------------------------
" Must have options {{{1
"
" These are highly recommended options.

" Vim with default settings does not allow easy switching between multiple files
" in the same editor window. Users can use multiple split windows or multiple
" tab pages to edit multiple files, but it is still best to enable an option to
" allow easier switching between files.
"
" One such option is the 'hidden' option, which allows you to re-use the same
" window and switch from an unsaved buffer without saving it first. Also allows
" you to keep an undo history for multiple files when re-using the same window
" in this way. Note that using persistent undo also lets you undo in multiple
" files even in the same window, but is less efficient and is actually designed
" for keeping undo history after closing Vim entirely. Vim will complain if you
" try to quit without saving, and swap files will keep you safe if your computer
" crashes.
set hidden

" Note that not everyone likes working this way (with the hidden option).
" Alternatives include using tabs or split windows instead of re-using the same
" window as mentioned above, and/or either of the following options:
" set confirm
" set autowriteall

" Better command-line completion
set wildmenu

" Show partial commands in the last line of the screen
set showcmd

" Highlight searches (use <C-L> to temporarily turn off highlighting; see the
" mapping of <C-L> below)
set hlsearch

" Modelines have historically been a source of security vulnerabilities. As
" such, it may be a good idea to disable them and use the securemodelines
" script, <http://www.vim.org/scripts/script.php?script_id=1876>.
" set nomodeline


"------------------------------------------------------------
" Usability options {{{1
"
" These are options that users frequently set in their .vimrc. Some of them
" change Vim's behaviour in ways which deviate from the true Vi way, but
" which are considered to add usability. Which, if any, of these options to
" use is very much a personal preference, but they are harmless.

" Use case insensitive search, except when using capital letters
set ignorecase
set smartcase

" Allow backspacing over autoindent, line breaks and start of insert action
set backspace=indent,eol,start

" When opening a new line and no filetype-specific indenting is enabled, keep
" the same indent as the line you're currently on. Useful for READMEs, etc.
set autoindent

" Stop certain movements from always going to the first character of a line.
" While this behaviour deviates from that of Vi, it does what most users
" coming from other editors would expect.
set nostartofline

" Display the cursor position on the last line of the screen or in the status
" line of a window
set ruler

" Always display the status line, even if only one window is displayed
set laststatus=2

" Always display the tab line
set showtabline=2

" Instead of failing a command because of unsaved changes, instead raise a
" dialogue asking if you wish to save changed files.
set confirm

" Use visual bell instead of beeping when doing something wrong
set visualbell

" And reset the terminal code for the visual bell. If visualbell is set, and
" this line is also included, vim will neither flash nor beep. If visualbell
" is unset, this does nothing.
set t_vb=

" Enable use of the mouse for all modes

if !has("gui_running")
	set mouse=a
	set nocompatible
endif

" Set the command window height to 2 lines, to avoid many cases of having to
" "press <Enter> to continue"
set cmdheight=2

" Display line numbers on the left
set number

" Quickly time out on keycodes, but never time out on mappings
set notimeout ttimeout ttimeoutlen=200

" Use <F11> to toggle between 'paste' and 'nopaste'
set pastetoggle=<F11>


"------------------------------------------------------------
" Indentation options {{{1
"
" Indentation settings according to personal preference.

" Indentation settings for using 4 spaces instead of tabs.
" Do not change 'tabstop' from its default value of 8 with this setup.
" set shiftwidth=4
" set softtabstop=4
" set expandtab

" Indentation settings for using hard tabs for indent. Display tabs as
" four characters wide.
" set shiftwidth=4
" set tabstop=4
autocmd FileType python setlocal shiftwidth=4 softtabstop=4 expandtab
autocmd FileType haskell setlocal shiftwidth=4 softtabstop=4 expandtab
autocmd FileType ml setlocal shiftwidth=4 softtabstop=4 expandtab
autocmd FileType ocaml setlocal shiftwidth=2 softtabstop=2 expandtab
autocmd FileType sh setlocal shiftwidth=2 softtabstop=2 expandtab
autocmd FileType tex setlocal shiftwidth=4 softtabstop=4 expandtab
autocmd FileType bib setlocal shiftwidth=4 softtabstop=4 expandtab
autocmd FileType cpp setlocal shiftwidth=8
autocmd FileType go setlocal shiftwidth=4 tabstop=4


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" Mappings
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" Map the leader key (i.e. key to be pressed before user commands) to comma
let mapleader = "\<space>"


" Useful mappings

" Map Y to act like D and C, i.e. to yank until EOL, rather than act as yy,
" which is the default
map Y y$

" Map <C-L> (redraw screen) to also turn off search highlighting until the
" next search
nnoremap <C-L> :nohl<CR><C-L>

"------------------------------------------------------------

set textwidth=80

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" vim-plug
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call plug#begin()

" lightline, lightweight airline
Plug 'itchyny/lightline.vim'

" Buffer display for lightline
Plug 'mengelbrecht/lightline-bufferline'

" ctrl-P
Plug 'ctrlpvim/ctrlp.vim'

" File system browswer
Plug 'scrooloose/nerdtree'

" Block commenting
Plug 'tpope/vim-commentary'

" Advanced grepping
Plug 'mileszs/ack.vim'

" Color scheme
Plug 'sainnhe/everforest'

" fzf
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }


call plug#end()


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" ag, better ack
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if executable('ag')
  let g:ackprg = 'ag --vimgrep'
endif


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" Lightline (https://github.com/itchyny/lightline.vim)
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let g:lightline = {
      \ 'colorscheme': 'darcula',
      \ 'active': {
      \   'left': [ [ 'mode', 'paste' ], [ 'readonly', 'filename', 'modified' ] ]
      \ },
      \ 'tabline': {
      \   'left': [ ['buffers'] ],
      \   'right': [ ['close'] ]
      \ },
      \ 'component_expand': {
      \   'buffers': 'lightline#bufferline#buffers'
      \ },
      \ 'component_type': {
      \   'buffers': 'tabsel'
      \ }
      \ }

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" Buffer Management
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set hidden " Allow buffers to be hidden if you've modified a buffer

" Move to the next buffer
nmap <leader>l :bnext<CR>

" Move to the previous buffer
nmap <leader>h :bprevious<CR>

" Close the current buffer and move to the previous one
" This replicates the idea of closing a tab
nmap <leader>q :bp <BAR> bd #<CR>

" Show all open buffers and their status
nmap <leader>bl :ls<CR>


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" ctrl-p
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let g:ctrlp_map = '<c-p>'
let g:ctrlp_cmd = 'CtrlP'
let g:ctrlp_working_path_mode = 'ra'

set wildignore+=*/tmp/*,*.so,*.swp,*.zip     " MacOSX/Linux

let g:ctrlp_custom_ignore = '\v[\/]\.(git|hg|svn)$'
let g:ctrlp_custom_ignore = {
  \ 'dir':  '\v[\/]\.(git|hg|svn)$',
  \ 'file': '\v\.(exe|so|dll)$',
  \ 'link': 'some_bad_symbolic_links',
  \ }


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" NERDTree
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let NERDTreeIgnore = ['\.o$', '\.o.cmd$', '\.a$']
autocmd vimenter * NERDTree
autocmd StdinReadPre * let s:std_in=1
autocmd VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif
map <C-n> :NERDTreeToggle<CR>  " open and close file tree
nmap <leader>n :NERDTreeFind<CR>  " open current buffer in file tree


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" Color Scheme: everforest
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" Important!!
if has('termguicolors')
  set termguicolors
endif

" For dark version.
set background=light

" For light version.
" set background=light

" Disable italic comment
let g:everforest_disable_italic_comment = 1

" Set contrast.
" This configuration option should be placed before `colorscheme everforest`.
" Available values: 'hard', 'medium'(default), 'soft'
let g:everforest_background = 'medium'

" For better performance
let g:everforest_better_performance = 1

colorscheme everforest


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" Lightline
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let g:lightline = {'colorscheme' : 'everforest'}