.vimrc

" VIM Configuration File
" Description: Optimized for C/C++ development for now.
" Author: Vishnu
"

" disable vi compatibility (emulation of old bugs - it's better to be safe than sorry)
set nocompatible
" use indentation of previous line
set autoindent
" use intelligent indentation for C
set smartindent
set smarttab

set encoding=utf-8

" automatically write files when changing when multiple files opwn
set autowrite

" configure tabwidth and insert spaces instead of tabs
set tabstop=4        " tab width is 4 spaces
set shiftwidth=4     " indent also with 4 spaces

" set mouse+=a

" WSL yank support
let s:clip = '/mnt/c/Windows/System32/clip.exe'  " change this path according to your mount point
if executable(s:clip)
    augroup WSLYank
            autocmd!
            autocmd TextYankPost * if v:event.operator ==# 'y' | call system(s:clip, @0) | endif
    augroup END
endif


" The following two lines solve the BCE issue described here: https://sunaku.github.io/vim-256color-bce.html
set term=screen-256color
set t_ut=

set background=dark

syntax on

" turn line numbers on
set number

" turn col and row position on in bottom right
set ruler


" highlight matching braces
set showmatch

" intelligent comments
set comments=sl:/*,mb:\ *,elx:\ */



" disable relative line numbers, remove no to sample it
set norelativenumber

" highlight search hits
set hlsearch
set incsearch   " incremental search: searches as you type( after /)
set linebreak

" Shows the keys being pressed on bottom right
set showcmd

au BufNewFile,BufRead,BufEnter *.cpp,*.hpp set omnifunc=omni#cpp#complete#Main

" Install OmniCppComplete like described on http://vim.wikia.com/wiki/C++_code_completion
" This offers intelligent C++ completion when typing ‘.’ ‘->’ or <C-o>
" Load standard tag files
set tags+=~/.vim/tags/cpp
" set tags+=~/.vim/tags/gl
" set tags+=~/.vim/tags/sdl
" set tags+=~/.vim/tags/qt4

" Install DoxygenToolkit from http://www.vim.org/scripts/script.php?script_id=987
let g:DoxygenToolkit_authorName="K Vishnu <atkumarvishnu@gmail.com>"

" Enhanced keyboard mappings
"
" in normal mode F2 will save the file
nmap <F2> :w<CR>
" in insert mode F2 will exit insert, save, enters insert again
imap <F2> <ESC>:w<CR>i
" switch between header/source with F4
map <F4> :e %:p:s,.h$,.X123X,:s,.cpp$,.h,:s,.X123X$,.cpp,<CR>
" recreate tags file with F5
map <F5> :!ctags -R –c++-kinds=+p –fields=+iaS –extra=+q .<CR>
" create doxygen comment
map <F6> :Dox<CR>
" build using makeprg with <F7>
map <F7> :make<CR>
" build using makeprg with <S-F7>
map <S-F7> :make clean all<CR>
" goto definition with F12
map <C-F12> :!ctags -R --sort=yes --c++-kinds=+pl --fields=+iaS --extra=+q .<CR>


" <F9> to build and run
autocmd filetype python nnoremap <F4> :w <bar> exec '!python '.shellescape('%')<CR>
autocmd filetype c nnoremap <F9> :w <bar> exec '!gcc '.shellescape('%').' -o '.shellescape('%:r').' && ./'.shellescape('%:r')<CR>
autocmd filetype cpp nnoremap <F9> :w <bar> exec '!g++ '.shellescape('%').' -o '.shellescape('%:r').' && ./'.shellescape('%:r')<CR>

" Polyglot Individual language packs can be disabled from here!
" let g:polyglot_disabled = ['markdown']


function! BuildYCM(info)
  " info is a dictionary with 3 fields
  " - name:   name of the plugin
  " - status: 'installed', 'updated', or 'unchanged'
  " - force:  set on PlugInstall! or PlugUpdate!
  if a:info.status == 'installed' || a:info.force
    !./install.py
  endif
endfunction



" Specify a directory for plugins
" only load plugins if Plug detected
if filereadable(expand("~/.vim/autoload/plug.vim"))

  " github.com/junegunn/vim-plu
  call plug#begin('~/.local/share/vim/plugins')
  " Polyglot is a collection of language packs for Vim
  Plug 'sheerun/vim-polyglot'
  " vim-pandoc provides pandoc document converter, allows us to work with documents written in its markdown variant
  Plug 'vim-pandoc/vim-pandoc'
  " plug for github
  Plug 'tpope/vim-fugitive'
  " a code-completion engine for Vim https://vimawesome.com/plugin/youcompleteme
  Plug 'valloric/youcompleteme', { 'do': function('BuildYCM') }
  " NERDTree is a file system explorer for the Vim editor  https://vimawesome.com/plugin/nerdtree-red
  Plug 'scrooloose/nerdtree'
  " syntax checking hacks   https://vimawesome.com/plugin/syntastic
  " check if it's same as polyglot
  Plug 'scrooloose/syntastic'
  " Lean & mean status/tabline   https://vimawesome.com/plugin/vim-airline-superman
  Plug 'vim-airline/vim-airline'
  " Comment functions so powerful—no comment necessary. https://vimawesome.com/plugin/the-nerd-commenter
  Plug 'scrooloose/nerdcommenter'
  " a class outline viewer https://vimawesome.com/plugin/tagbar
  Plug 'majutsushi/tagbar'
  " Seamless navigation between tmux panes and vim splits
  Plug 'christoomey/vim-tmux-navigator'
  " fuzzy finder  https://vimawesome.com/plugin/fzf
  Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
  " themes  
  Plug 'morhetz/gruvbox'
  call plug#end()

  " pandoc
  let g:pandoc#formatting#mode = 'h' " A'
  let g:pandoc#formatting#textwidth = 72

else
  autocmd vimleavepre *.go !gofmt -w % " backup if fatih fails
endif



let mapleader = ","

nnoremap <leader>n :NERDTreeFocus<CR>
nnoremap <C-n> :NERDTree<CR>
nnoremap <C-t> :NERDTreeToggle<CR>
nnoremap <C-f> :NERDTreeFind<CR>

nmap <F8> :TagbarToggle<CR>

" 
set statusline+=%#warningmsg#
set statusline+=%{SyntasticStatuslineFlag()}
set statusline+=%*

let g:syntastic_always_populate_loc_list = 1
let g:syntastic_auto_loc_list = 1
let g:syntastic_check_on_open = 1
let g:syntastic_check_on_wq = 0

let g:syntastic_cpp_checkers = ['clang_check', 'gcc']
" 


" OmniCppComplete
let OmniCpp_NamespaceSearch = 1
let OmniCpp_GlobalScopeSearch = 1
let OmniCpp_ShowAccess = 1
let OmniCpp_ShowPrototypeInAbbr = 1 " show function parameters
let OmniCpp_MayCompleteDot = 1 " autocomplete after .
let OmniCpp_MayCompleteArrow = 1 " autocomplete after ->
let OmniCpp_MayCompleteScope = 1 " autocomplete after ::
let OmniCpp_DefaultNamespaces = ["std", "_GLIBCXX_STD"]
" automatically open and close the popup menu / preview window
au CursorMovedI,InsertLeave * if pumvisible() == 0|silent! pclose|endif
set completeopt=menuone,menu,longest,preview




au BufLeave ~/.vimrc :source ~/.vimrc