" *************************************************************************
" presettings
" *************************************************************************
set encoding=utf8
set nocompatible

if has('win32')
    let DATA_DIR = $HOME.'/vimfiles'
else
    let DATA_DIR = $HOME.'/.vim'
endif

" *************************************************************************
" vim plugins
" *************************************************************************

let GITHUB_SITE = 'https://ghproxy.com/https://github.com/'
"let GITHUB_SITE = 'https://hub.fastgit.xyz/'
"let GITHUB_SITE = 'https://github.com/'
let GITHUB_RAW = 'https://raw.fastgit.org/'
"let GITHUB_RAW = 'https://ghproxy.com/https://raw.githubusercontent.com/'
"let GITHUB_RAW = 'https://raw.githubusercontent.com/'

" download the plugin manager if not installed
let AUTOLOAD_DIR =  DATA_DIR.'/autoload'
let PLUGIN_MANAGER_PATH = AUTOLOAD_DIR.'/plug.vim'
let PLUGIN_MANAGER_URL = GITHUB_RAW.'/junegunn/vim-plug/master/plug.vim'
if empty(glob(PLUGIN_MANAGER_PATH))
    echo 'Downloading plugin manager ...'
    if has('win32') && executable('powershell')
        silent execute '!powershell "iwr -useb '.PLUGIN_MANAGER_URL.' |`'
                    \ 'ni '.PLUGIN_MANAGER_PATH.' -Force"'
    elseif executable('wget')
        silent execute '!mkdir -p '.AUTOLOAD_DIR.' '
                    \ .'&& wget -O '.PLUGIN_MANAGER_PATH.' '.PLUGIN_MANAGER_URL.' '
                    \ .'&& echo "Download successful." || echo "Download failed." '
    elseif executable('curl')
        silent execute '!curl -fLo '.PLUGIN_MANAGER_PATH
                    \ .' --create-dirs '.PLUGIN_MANAGER_URL.' '
                    \ .'&& echo "Download successful." || echo "Download failed." '
    else
        echo 'Please download the plugin manager from '.PLUGIN_MANAGER_URL
                    \ .' and place it in '.PLUGIN_MANAGER_PATH
    endif
    autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

call plug#begin()

" --------------------
" color schemes
" --------------------
Plug GITHUB_SITE.'flazz/vim-colorschemes'

" --------------------
" mostly used
" --------------------
Plug GITHUB_SITE.'preservim/nerdtree', { 'on': 'NERDTreeToggle' }
Plug GITHUB_SITE.'rbong/vim-crystalline', { 'branch': 'vim-7' }
Plug GITHUB_SITE.'mbbill/undotree'
Plug GITHUB_SITE.'preservim/tagbar', { 'on': 'TagbarToggle' }
Plug GITHUB_SITE.'mileszs/ack.vim'
Plug GITHUB_SITE.'vim-scripts/YankRing.vim'

" --------------------
" more convenience
" --------------------
if has('timers')
    Plug GITHUB_SITE.'delphinus/vim-auto-cursorline'
endif
Plug GITHUB_SITE.'luochen1990/rainbow'
Plug GITHUB_SITE.'gosukiwi/vim-smartpairs'
Plug GITHUB_SITE.'airblade/vim-rooter'
Plug GITHUB_SITE.'junegunn/vim-peekaboo'
Plug GITHUB_SITE.'tpope/vim-commentary'
Plug GITHUB_SITE.'farmergreg/vim-lastplace'
" system clipboard
Plug GITHUB_SITE.'ojroques/vim-oscyank', { 'branch': 'main' }
Plug GITHUB_SITE.'christoomey/vim-system-copy'
" vim performance
if has('timers') && has ('terminal')
    Plug GITHUB_SITE.'dstein64/vim-startuptime'
else
    Plug GITHUB_SITE.'NewComer00/startuptime.vim', { 'branch': 'patch-1' }
endif

call plug#end()

" *************************************************************************
" plugin configs
" *************************************************************************

" flazz/vim-colorschemes
syntax on
colorscheme molokai

" rbong/vim-crystalline
function! StatusLine(...)
  return crystalline#mode() . crystalline#right_mode_sep('Line')
        \ . ' %f%h%w%m%r ' . crystalline#right_sep('Line', 'Fill') . '%='
        \ . crystalline#left_sep('Line', 'Fill')
        \ . ' %{&ft} [%{&fenc!=#""?&fenc:&enc}] [%{&ff}] Line:%l/%L Col:%c%V %P '
endfunction
let g:crystalline_statusline_fn = 'StatusLine'
let g:crystalline_theme = 'jellybeans'

" preservim/nerdtree
let NERDTreeWinPos="right"
let NERDTreeShowHidden=1
let NERDTreeMouseMode=2
" disable the original file explorer
let g:loaded_netrw = 1
let g:loaded_netrwPlugin = 1
" lazy load nerdtree when open a directory
" https://github.com/junegunn/vim-plug/issues/424#issuecomment-189343357
augroup nerd_loader
  autocmd!
  autocmd VimEnter * silent! autocmd! FileExplorer
  autocmd BufEnter,BufNew *
        \  if isdirectory(expand('<amatch>'))
        \|   call plug#load('nerdtree')
        \|   execute 'autocmd! nerd_loader'
        \| endif
augroup END

" preservim/tagbar
let g:tagbar_position = 'vertical leftabove'
let g:tagbar_width = max([25, winwidth(0) / 5])

" mileszs/ack.vim
if executable('ag')
    let g:ackprg = 'ag --vimgrep --hidden --ignore .git'
endif

" rainbow/luochen1990
let g:rainbow_active = 1
let g:rainbow_conf = {
\   'separately': {
\   'nerdtree': 0,
\   }
\}

" vim-scripts/YankRing.vim
" to avoid <C-p> collision with the ctrlp plugin
let g:yankring_replace_n_pkey = '<m-p>'
let g:yankring_replace_n_nkey = '<m-n>'
" save yankring history in this dir
let s:yankring_dir = DATA_DIR.'/yankring-dir'
if !isdirectory(s:yankring_dir)
    call mkdir(s:yankring_dir)
endif
let g:yankring_history_dir = s:yankring_dir

" christoomey/vim-system-copy
let g:system_copy_enable_osc52 = 1
if has('win32') && executable('powershell')
    " force cmd.exe to use utf-8 encoding
    " https://stackoverflow.com/questions/57131654/using-utf-8-encoding-chcp-65001-in-command-prompt-windows-powershell-window
    call system('chcp 65001')
    " https://github.com/christoomey/vim-system-copy/pull/35#issue-557371087
    let g:system_copy#paste_command='powershell "Get-Clipboard"'
endif

" *************************************************************************
" my scripts
" *************************************************************************
" speed up vim scrolling
" https://stackoverflow.com/questions/307148/vim-scrolling-slowly
set ttyfast
set lazyredraw

" speed up syntax highlighting & regex performance
" https://vi.stackexchange.com/a/21641
" https://gist.github.com/glts/5646749
if exists('&regexpengine')
  set regexpengine=1
endif

" to enable backspace key
" https://vi.stackexchange.com/a/2163
set backspace=indent,eol,start

set novisualbell

" to deal with REPLACE MODE problem on windows cmd or windows terminal
" https://superuser.com/a/1525060
set t_u7=

set t_Co=256

set hlsearch
set incsearch

set number
set relativenumber

set nowrap

set tabstop=4
set shiftwidth=4
set expandtab

set autoindent

set wildmode=longest,full
set wildmenu

set mouse=a
" mouse will still work beyond the 223rd col if vim supports mouse-sgr
" https://stackoverflow.com/a/19253251/15283141
if has("mouse_sgr")
    set ttymouse=sgr
else
    set ttymouse=xterm2
end

set laststatus=2

set splitbelow
set splitright

set dictionary+=/usr/share/dict/words
set complete+=k

" to be compatable with older version
" https://stackoverflow.com/a/36374234/15283141
if has("patch-7.4.710")
    set listchars=eol:↵,tab:\|\|,trail:~,extends:>,precedes:<,space:·
else
    set listchars=eol:↵,tab:\|\|,trail:~,extends:>,precedes:<
endif
set list

" Let's save undo info!
" from https://vi.stackexchange.com/a/53
let s:undo_dir = DATA_DIR.'/undo-dir'
if !isdirectory(s:undo_dir)
    call mkdir(s:undo_dir, "", 0700)
endif
let &undodir = s:undo_dir
set undofile

" *************************************************************************
" my functions
" *************************************************************************

" function to run a shell
" https://stackoverflow.com/questions/1236563/how-do-i-run-a-terminal-inside-of-vim
function! OpenShell()
    if v:version < 801
        echo "Press any key to open a shell..."
        echo "After the shell opened, press <C-d> or type 'exit' to quit the shell."
        call getchar()
        sh
    else
        bo 10sp | term ++curwin

        " enable the shortcut to close the shell
        if has('win32')
            tnoremap <silent> <F3> <C-End><C-Home>exit<CR>
        else
            tnoremap <silent> <F3> <C-a><C-k><C-d>
        endif

    endif
endfunction

" allow toggling between local and default mode
" https://vim.fandom.com/wiki/Toggle_between_tabs_and_spaces
function! TabToggle()
  if &expandtab
    set noexpandtab
  else
    set expandtab
  endif
endfunction

" test the startup time of Vim
function! TimingVimStartup(sorted)
    let l:cmd = ''
    if has('timers') && has ('terminal')
        let l:cmd = 'StartupTime --tries 10'
        if a:sorted == 0
            let l:cmd .= ' --no-sort'
        endif
    else
        let l:cmd = 'StartupTime'
    endif
    execute(l:cmd)
endfunction

" *************************************************************************
" hotkeys
" *************************************************************************

" functional hotkeys for plugins
nnoremap <silent> <F2> :NERDTreeToggle<CR>
nnoremap <silent> <F3> :call OpenShell()<CR>
nnoremap <silent> <F4> :UndotreeToggle<CR>
nnoremap <silent> <F7> :YRShow<CR>
nnoremap <silent> <F8> :TagbarToggle<CR>
nnoremap <F9> :AckFile!<Space>

inoremap <silent> <F2> <Esc>:NERDTreeToggle<CR>
inoremap <silent> <F3> <Esc>:call OpenShell()<CR>
inoremap <silent> <F4> <Esc>:UndotreeToggle<CR>
inoremap <silent> <F7> <Esc>:YRShow<CR>
inoremap <silent> <F8> <Esc>:TagbarToggle<CR>
inoremap <F9> <Esc>:AckFile!<Space>

cnoremap <silent> <F9> <C-c>

" quickly edit this config file
nnoremap <leader>ve :tabnew $MYVIMRC<CR>
" quickly save and source this config file
nnoremap <leader>vs :wa<Bar>so $MYVIMRC<CR>
" plugin manager shortcuts
nnoremap <leader>vi :wa<Bar>silent! so $MYVIMRC<CR>:PlugInstall<CR>
nnoremap <leader>vc :wa<Bar>silent! so $MYVIMRC<CR>:PlugClean<CR>
nnoremap <leader>vu :wa<Bar>silent! so $MYVIMRC<CR>:PlugUpdate<CR>
" test vim startup time
nnoremap <leader>vt :call TimingVimStartup(1)<CR>
nnoremap <leader>vT :call TimingVimStartup(0)<CR>

" toggle paste mode
nnoremap <leader>p :set paste!<CR>

" toggle list char
nnoremap <leader>l :set list!<CR>

" toggle tab/spaces
nnoremap <leader>t :call TabToggle()<CR>

" strip trailing whitespaces
" https://vi.stackexchange.com/a/2285
nnoremap <leader>s :let _s=@/<Bar>:%s/\s\+$//e<Bar>:let @/=_s<Bar><CR>

" search the word under the cursor
nnoremap <leader>a :Ack!<CR>
" search the given word
nnoremap <leader>A :Ack!<Space>

" christoomey/vim-system-copy
nmap cy <Plug>SystemCopy
xmap cy <Plug>SystemCopy
nmap cY <Plug>SystemCopyLine
nmap cp <Plug>SystemPaste
xmap cp <Plug>SystemPaste
nmap cP <Plug>SystemPasteLine