" ==============================================================================
" Plugins
" ==============================================================================
let s:running_windows = has("win16") || has("win32") || has("win64")
silent! call plug#begin('~/.vim/plugged')

Plug 'https://github.com/ervandew/supertab'
Plug 'https://github.com/scrooloose/nerdtree', { 'on': 'NERDTreeToggle' }
Plug 'https://github.com/tpope/vim-fugitive'
Plug 'https://github.com/bfrg/vim-cpp-modern'
Plug 'https://github.com/skywind3000/asyncrun.vim'
Plug 'https://github.com/junegunn/fzf'
Plug 'https://github.com/junegunn/fzf.vim'
Plug 'https://github.com/Tetralux/odin.vim'

" Themes
Plug 'https://github.com/tomasr/molokai'
Plug 'https://github.com/roosta/vim-srcery'
Plug 'https://github.com/morhetz/gruvbox'

call plug#end()

" ==============================================================================
" Settings
" ==============================================================================
set nocompatible
set autowrite     " Automatically save before commands like :next and :make
set autoread      " Auto reload changed files
set backspace=2   " Backspace like most programs in insert mode
set hidden        " Allow more than one modified buffer to be left without saving
set incsearch     " Do incremental searching
set ignorecase    " Search isn't case sensitive
set lazyredraw    " Redraw the screen less often
set nowrap        " No softwrapping by default
set splitright    " Open new v-splits to the right
set showcmd       " Display incomplete commands
set vb            " Turn on screen flash which is quieter than audio bell
set wildmenu      " Allow vim command-line autocompletion
set wildmode=full " Specifies option for wildmenu
set expandtab     " Turn tabs into spaces
set noswapfile    " Disable swapfile
set cscopetag     " Search both cscopes db and tags file"

" Ignore files in commandline autocomplete
set wildignore+=*.class,*.o
set wildignore+=*\\tmp\\*,*.swp,*.zip,*.exe,*.obj,*.vcxproj,*.pdb,*.idb

" Undo Settings
silent! set undofile                       " Save undo history to file
set undolevels=1000                        " Maximum number of undos that can be done
let &undodir=expand("~/.vim/undodir") " Set location to save undo files

" Create the undo history folder if it doesn't exist
if !isdirectory(expand(&undodir))
  call mkdir(expand(&undodir), "p")
endif

" ==============================================================================
" Appearance
" ==============================================================================
syntax on                " syntax highlighting
set autoindent           " Always use autoindent
set background=dark      " Some themes use this indicator to theme themselves
set colorcolumn=80,100   " Set a 80, 100 char column marker
set cpoptions+=$         " $ as end marker for the change operator
set cursorline           " Highlight current line
set encoding=utf-8       " Consistent character encoding
set fileformats=unix,dos
" <z+o>       opens a fold at the cursor.
" <z,Shift+o> opens all folds at the cursor.
" <z,c>       closes a fold at the cursor.
" <z,m>       increases the foldlevel by one.
" <z,Shift+m> closes all open folds.
" <z,r>       decreases the foldlevel by one.
" <z,Shift+r> decreases the foldlevel to zero -- all folds will be open.
set foldlevelstart=99    " Initially all folds open
set foldmethod=indent    " Allow folding of
set foldnestmax=20       " Maximum number of nested folds
set guioptions=menu      " remove extra gui elements
set laststatus=2         " always show status bar
set linebreak            " When wrapping lines, don't break words
set list                 " Show 'listchar' characters
set number               " Show line numbers
set relativenumber       " Show relative line numbers
set ruler                " show the cursor position all the time
set shiftwidth=4         " Number of space chars for indentation
set showmatch            " automatically show matching brackets. works like it does in bbedit.
set smartindent
set smarttab             " Make 'tab' insert indents at the beginning of a line
set tabstop=4            " Number of space chars for pressing tab
set textwidth=80         " Always format to 80 chars
set listchars=tab:>-

" Show EOL type and last modified timestamp, right after the filename
set statusline=%<%F%h%m%r\ [%{&ff}]\ (%{strftime(\"%H:%M\ %d/%m/%Y\",getftime(expand(\"%:p\")))})%=%l,%c%V\ %P

" Resize splits when the window is resized
au VimResized * :wincmd =

" ==============================================================================
" Theme
" ==============================================================================
let g:gruvbox_contrast_dark='hard'
let g:gruvbox_italic=0
let g:gruvbox_bold=0
colorscheme gruvbox

" NOTE(doyle): Some list chars in gui don't show correctly in terminal so separate logic
" old listchars=tab:>-,eol:¬,trail:■,extends:»,precedes:«
set listchars+=trail:■,extends:»,precedes:«
if s:running_windows
    set guifont=JetBrains_Mono:h9,Consolas:h9
else
    set guifont=InputMonoCondensed:h9
endif

" Don't show trailing spaces in insert mode
augroup trailing
  au!
  au InsertEnter * :set listchars-=trail:■
  au InsertLeave * :set listchars+=trail:■
augroup END

" Increase font size using (Ctrl+Up Arrow) or (Ctrl+Down Arrow) if we are using
" gvim Otherwise font size is determined in terminal
nnoremap <C-Up> :silent! let &guifont = substitute(
 \ &guifont,
 \ ':h\zs\d\+',
 \ '\=eval(submatch(0)+1)',
 \ 'g')<CR>
nnoremap <C-Down> :silent! let &guifont = substitute(
 \ &guifont,
 \ ':h\zs\d\+',
 \ '\=eval(submatch(0)-1)',
 \ 'g')<CR>

" Formatting options (see :h fo-table)
augroup persistent_settings
  au!
  au BufEnter * :set formatoptions=q1j
augroup END

" ==============================================================================
" Key Bindings
" ==============================================================================
" Enable mouse support
if has('mouse')
    set mouse=a
endif

" Map Ctrl+HJKL to navigate buffer window
nmap <silent> <C-h> :wincmd h<CR>
nmap <silent> <C-j> :wincmd j<CR>
nmap <silent> <C-k> :wincmd k<CR>
nmap <silent> <C-l> :wincmd l<CR>

" Move by wrapped lines instead of line numbers
nnoremap j gj
nnoremap k gk
nnoremap gj j
nnoremap gk k

" Map NERDTree to Ctrl-N
map <C-n> :NERDTreeToggle<CR>

" Change to current buffer's directory
nmap cd :cd <C-R>=expand("%:p:h")<CR><CR>

" Buffer Splitting
nnoremap <leader>s :vs<CR>

" Go to next error
" Go to previous error
nnoremap <A-n> :cn<CR>
nnoremap <A-p> :cp<CR>

" ==============================================================================
" FZF
" ==============================================================================
nnoremap <leader>f :FzfFiles 
nnoremap <leader>t :FzfTags<CR>
nnoremap <leader>r :FzfRg 
nnoremap <leader>b :FzfBuffers<CR>
nnoremap <leader>l :FzfLines<CR>

" Empty value to disable preview window altogether
let g:fzf_preview_window = []

" Prefix all commands with Fzf for discoverability
let g:fzf_command_prefix = 'Fzf'

" - down / up / left / right
let g:fzf_layout = { 'down': '40%' }

" ==============================================================================
" Clang Format
" ==============================================================================
map <C-I> :py3file ~/.vim/clang-format.py<CR>

" ==============================================================================
" Compiling / AsyncRun
" ==============================================================================
" Asyncrun open quickfix window up to 10 lines
let g:asyncrun_open = 10

" Error message formats thanks to
" https://forums.handmadehero.org/index.php/forum?view=topic&catid=4&id=704#3982
set errorformat+=\\\ %#%f(%l\\\,%c):\ %m                       " MSVC: MSBuild
set errorformat+=\\\ %#%f(%l)\ :\ %#%t%[A-z]%#\ %m             " MSVC: cl.exe
set errorformat+=\\\ %#%t%nxx:\ %m                             " MSVC: cl.exe, fatal errors is crudely implemented
set errorformat+=\\\ %#LINK\ :\ %m                             " MSVC: link.exe, can't find link library badly implemented
set errorformat+=\\\ %#%s\ :\ error\ %m                        " MSVC: link.exe, errors is badly implemented
set errorformat+=\\\ %#%s\ :\ fatal\ error\ %m                 " MSVC: link.exe, fatal errors is badly implemented
set errorformat+=\\\ %#%f(%l\\\,%c-%*[0-9]):\ %#%t%[A-z]%#\ %m " MSVC: HLSL fxc.exe
set errorformat+=%\\%%(CTIME%\\)%\\@=%m                        " ctime.exe -stats

if s:running_windows
    set makeprg=build
    nnoremap <f5> :AsyncRun ./build.bat<cr>
else
    " Set vim terminal to enter normal mode using escape like normal vim behaviour
    tnoremap <Esc> <C-\><C-n>
    nnoremap <f5> :AsyncRun ./build.sh<cr>
    set makeprg=./build.sh
endif

" ==============================================================================
" Other
" ==============================================================================
" Reload vimrc when it's edited
augroup myvimrc
    au!
    au BufWritePost $MYVIMRC so $MYVIMRC
augroup end

" Return to the same line when a file is reopened
augroup line_return
  au!
  au BufReadPost *
        \ if line("'\"") > 0 && line("'\"") <= line("$") |
        \     execute 'normal! g`"zvzz' |
        \ endif
augroup end