Example vimrc for Golang and Flutter developer

.vimrc

call plug#begin('~/.vim/plugged')
" Declare the list of plugins.
Plug 'tpope/vim-sensible'
Plug 'junegunn/seoul256.vim'
" code
Plug 'pangloss/vim-javascript'
" linters
Plug 'w0rp/ale'
" helpers
"Plug 'scrooloose/nerdtree'
Plug 'easymotion/vim-easymotion'
Plug 'preservim/nerdtree'
Plug 'jiangmiao/auto-pairs'
Plug 'itchyny/lightline.vim'
Plug 'maximbaz/lightline-ale'
Plug 'junegunn/goyo.vim'
" Plug 'psliwka/vim-smoothie'
Plug 'mhinz/vim-startify'
Plug 'iamcco/markdown-preview.nvim', { 'do': 'cd app & yarn install'  }
Plug 'ekalinin/dockerfile.vim'
"git
Plug 'airblade/vim-gitgutter'
Plug 'itchyny/vim-gitbranch'
Plug 'tpope/vim-fugitive'
Plug 'junegunn/gv.vim'
Plug 'jreybert/vimagit'
Plug 'rhysd/git-messenger.vim'
"fzf
Plug 'junegunn/fzf', { 'dir': '~/.fzf', 'do': './install --all' }
Plug 'junegunn/fzf.vim'
"coc.vim
Plug 'neoclide/coc.nvim', {'branch': 'release'}
"theme
Plug 'dracula/vim', { 'as': 'dracula' }
Plug 'haishanh/night-owl.vim'
Plug 'ayu-theme/ayu-vim'
Plug 'arcticicestudio/nord-vim'
Plug 'patstockwell/vim-monokai-tasty'
Plug 'joshdick/onedark.vim'
" Plug for flutter
Plug 'dart-lang/dart-vim-plugin'
Plug 'thosakwe/vim-flutter'
Plug 'liuchengxu/vim-clap'
Plug 'natebosch/vim-lsc'
Plug 'natebosch/vim-lsc-dart'
Plug 'wincent/command-t'

Plug 'tpope/vim-commentary'
Plug 'Xuyuanp/nerdtree-git-plugin'
Plug 'yuttie/comfortable-motion.vim'

" Golang
Plug 'sebdah/vim-delve'
Plug 'fatih/vim-go'
Plug 'ryanoasis/vim-devicons'
Plug 'buoto/gotests-vim'
" List ends here. Plugins become visible to Vim after this call.
call plug#end()

" Global setting
syntax on
color ayu
colorscheme onedark
set background=dark
set number
set relativenumber
set encoding=utf-8
set fileencoding=utf-8
set nomodeline
set hidden
set cmdheight=2
set tabstop=4
set shiftwidth=4
set softtabstop=4
set expandtab
set showcmd
set cursorline
set list
set lcs=tab:\|\  "
set termguicolors
set wildmenu
set showmatch
set lazyredraw
set incsearch
set hlsearch
" if hidden is not set, TextEdit might fail.
set hidden
" Some servers have issues with backup files, see #649
set nobackup
set nowritebackup
" Better display for messages
set cmdheight=2
" You will have bad experience for diagnostic messages when it's default 4000.
set updatetime=300
" don't give |ins-completion-menu| messages.
set shortmess+=c
" always show signcolumns
set signcolumn=yes

filetype plugin on
filetype indent on
filetype plugin indent on    " required
let ayucolor="mirage"
let g:go_def_mapping_enabled = 0
let g:user_emmet_mode='a'
let g:user_emmet_leader_key='<Tab>'
let g:user_emmet_settings= {
    \ 'javascript.jsx' : {
    \ 'extends': 'jsx',
    \ },
\}
let g:go_auto_sameids = 1
let g:go_highlight_structs = 1
let g:go_highlight_interfaces = 1
let g:go_highlight_methods = 1
let g:go_highlight_functions = 1
let g:go_highlight_operators = 1
let g:go_highlight_build_constraints = 1
let g:go_highlight_extra_types = 1
let g:go_highlight_function_parameters = 1
let g:go_highlight_function_calls = 1
let g:go_highlight_types = 1
let g:go_hightlight_fields = 1
let g:go_highlight_generate_tags = 1
let g:go_highlight_variable_declarations = 1
let g:go_highlight_variable_assignments = 1
let g:go_fmt_command = "goimports"
let g:go_def_mode='gopls'
let g:go_info_mode='gopls'
let g:NERDSpaceDelims = 1
let g:NERDCompactSexyComs = 1
let g:NERDTreeMouseMode=3
let g:go_debug_windows = {
      \ 'vars':       'rightbelow 60vnew',
      \ 'stack':      'rightbelow 10new',
\ }

" Auto cmd
augroup mygroup
  autocmd!
  " Setup formatexpr specified filetype(s).
  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
  " Update signature help on jump placeholder
  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
  "NerdTree configurations
  autocmd StdinReadPre * let s:std_in=1
  autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | exe 'cd '.argv()[0] | endif
  " nerdCommenter
  " 2 spaces indent for yaml files
  autocmd FileType yaml,yml setlocal ts=2 sts=2 sw=2 expandtab
  " json
  autocmd FileType json syntax match Comment +\/\/.\+$+
  "go lang
  autocmd FileType go nmap <leader>b  <Plug>(go-build)
  autocmd FileType go nmap <leader>r  <Plug>(go-run)
  autocmd FileType dart setlocal ts=2 sts=2 sw=2 expandtab
  autocmd BufEnter *.cls setlocal filetype=java
  autocmd BufEnter *.zsh-theme setlocal filetype=zsh
  autocmd BufEnter Makefile setlocal noexpandtab
  autocmd BufEnter *.sh setlocal tabstop=2
  autocmd BufEnter *.sh setlocal shiftwidth=2
  autocmd BufEnter *.sh setlocal softtabstop=2
augroup end

""" Specified setting and mapping
let mapleader=" "
"set guifont=Fira\ Code\ Retina\ 11
nmap <C-e> :e#<CR>
nmap ; :Buffers<CR>
nnoremap <Leader>ff :Files<Cr>
nnoremap <Leader>t :Rg<Cr>
" turn off search highlight
nnoremap <leader><space> :nohlsearch<CR>

"==============COC configurations========================
"==============COC configurations========================
" Use tab for trigger completion with characters ahead and navigate.
" Use command ':verbose imap <tab>' to make sure tab is not mapped by other plugin.
inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"

function! s:check_back_space() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~# '\s'
endfunction

" Use <c-space> to trigger completion.
inoremap <silent><expr> <c-space> coc#refresh()

" Use <cr> to confirm completion, `<C-g>u` means break undo chain at current position.
" Coc only does snippet and additional edit on confirm.
inoremap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
" Or use `complete_info` if your vim support it, like:
" inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"

" Remap keys for gotos
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

" Highlight symbol under cursor on CursorHold
autocmd CursorHold * silent call CocActionAsync('highlight')

" Remap for rename current word
nmap <leader>rn <Plug>(coc-rename)

" Remap for do codeAction of current line
nmap <leader>ac  <Plug>(coc-codeaction)
" Fix autofix problem of current line
nmap <leader>qf  <Plug>(coc-fix-current)

" Create mappings for function text object, requires document symbols feature of languageserver.
xmap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap if <Plug>(coc-funcobj-i)
omap af <Plug>(coc-funcobj-a)

" Use <TAB> for select selections ranges, needs server support, like: coc-tsserver, coc-python
nmap <silent> <TAB> <Plug>(coc-range-select)
xmap <silent> <TAB> <Plug>(coc-range-select)

" Use `:Format` to format current buffer
command! -nargs=0 Format :call CocAction('format')

" Use `:Fold` to fold current buffer
command! -nargs=? Fold :call     CocAction('fold', <f-args>)

" use `:OR` for organize import of current buffer
command! -nargs=0 OR   :call     CocAction('runCommand', 'editor.action.organizeImport')
" Add status line support, for integration with other plugin, checkout `:h coc-status`
set statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}

" Using CocList
" Show all diagnostics
nnoremap <silent> <space>a  :<C-u>CocList diagnostics<cr>
" Manage extensions
nnoremap <silent> <space>e  :<C-u>CocList extensions<cr>
" Show commands
nnoremap <silent> <space>c  :<C-u>CocList commands<cr>
" Find symbol of current document
nnoremap <silent> <space>o  :<C-u>CocList outline<cr>
" Search workspace symbols
nnoremap <silent> <space>s  :<C-u>CocList -I symbols<cr>
" Do default action for next item.
nnoremap <silent> <space>j  :<C-u>CocNext<CR>
" Do default action for previous item.
nnoremap <silent> <space>k  :<C-u>CocPrev<CR>
" Resume latest coc list
nnoremap <silent> <space>p  :<C-u>CocListResume<CR>

" Use U to show documentation in preview window
nnoremap <silent> U :call <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  else
    call CocAction('doHover')
  endif
endfunction

"==================NERDTree==================================
:set mouse=a
:nnoremap tt :NERDTreeToggle<CR>
:nnoremap tf :NERDTreeFocus<CR>

"=================Vim-clap configurations====================
nnoremap <leader>cg :Clap grep<cr>

"=================Dart/Flutter configurations================
let g:lsc_server_commands = {'dart': 'dart_language_server'}
let g:lsc_auto_map = {
    \ 'GoToDefinition': 'gD',
    \ 'GoToDefinitionSplit': ['<C-W>]', '<C-W><C-]>'],
    \ 'FindReferences': 'gR',
    \ 'NextReference': 'gnr',
    \ 'PreviousReference': 'gpr',
    \ 'FindImplementations': 'gI',
    \ 'FindCodeActions': 'ga',
    \ 'Rename': 'grn',
    \ 'ShowHover': v:true,
    \ 'DocumentSymbol': 'go',
    \ 'WorkspaceSymbol': 'gS',
    \ 'SignatureHelp': 'gm',
    \ 'Completion': 'completefunc',
    \}
autocmd CompleteDone * silent! pclose
" Some of these key choices were arbitrary;
" it's just an example.
"nnoremap <leader>fa :FlutterRun<cr>
"nnoremap <leader>fq :FlutterQuit<cr>
"nnoremap <leader>fr :FlutterHotReload<cr>
"nnoremap <leader>fR :FlutterHotRestart<cr>
"nnoremap <leader>fD :FlutterVisualDebug<cr>

call dart#ToggleFormatOnSave()


"================= Custom for fast developing================
" For local replace
nnoremap fr gd[{V%::s/<C-R>///gc<left><left><left>
" For global replace
nnoremap fR gD:%s/<C-R>///gc<left><left><left>
" For insert 1 character
nnoremap <Space> i_<Esc>r
" move vertically by visual line
nnoremap j gj
nnoremap k gk
" move to beginning/end of line
nnoremap B ^
nnoremap E $
" $/^ doesn't do anything
nnoremap $ <nop>
nnoremap ^ <nop>
" highlight last inserted text
nnoremap gV `[v`]
" jk is escape
inoremap jk <esc>
" edit vimrc/zshrc and load vimrc bindings
nnoremap <leader>ev :vsp $MYVIMRC<CR>
nnoremap <leader>ez :vsp ~/.zshrc<CR>
nnoremap <leader>sv :source $MYVIMRC<CR>
" save session
nnoremap <leader>s :mksession<CR>
" Split navigations
"nnoremap <C-J> <C-W><C-J>
"nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>

" Replace the whore word with clipboard
nnoremap <leader>raw "_dawhp 

inoremap <C-f> <Right>
inoremap <C-b> <Left>

" Switch to previous file
nmap <C-e> :e#<CR>

" Vim easymotion
nmap <leader>g <Plug>(easymotion-overwin-f)
nmap <leader>l <Plug>(easymotion-overwin-line)

" Remap the hjkl
nnoremap L l
nnoremap H h
nnoremap l w
nnoremap h b

" Resize split window
nnoremap <silent> + :exe "vertical resize +5"<CR>
nnoremap <silent> _ :exe "vertical resize -5"<CR>

" Open terminal
nnoremap <Leader>at :call FloatTerm()<CR>
" Open tig, yes TIG, A FLOATING TIGGGG!!!!!!
nnoremap <Leader>ag :call FloatTerm('"tig"')<CR>
" Floating Term
let s:float_term_border_win = 0
let s:float_term_win = 0
function! FloatTerm(...)
  " Configuration
  let height = float2nr((&lines - 2) * 0.6)
  let row = float2nr((&lines - height) / 2)
  let width = float2nr(&columns * 0.6)
  let col = float2nr((&columns - width) / 2)
  " Border Window
  let border_opts = {
        \ 'relative': 'editor',
        \ 'row': row - 1,
        \ 'col': col - 2,
        \ 'width': width + 4,
        \ 'height': height + 2,
        \ 'style': 'minimal'
        \ }
  " Terminal Window
  let opts = {
        \ 'relative': 'editor',
        \ 'row': row,
        \ 'col': col,
        \ 'width': width,
        \ 'height': height,
        \ 'style': 'minimal'
        \ }
  let top = "╭" . repeat("─", width + 2) . "╮"
  let mid = "│" . repeat(" ", width + 2) . "│"
  let bot = "╰" . repeat("─", width + 2) . "╯"
  let lines = [top] + repeat([mid], height) + [bot]
  let bbuf = nvim_create_buf(v:false, v:true)
  call nvim_buf_set_lines(bbuf, 0, -1, v:true, lines)
  let s:float_term_border_win = nvim_open_win(bbuf, v:true, border_opts)
  let buf = nvim_create_buf(v:false, v:true)
  let s:float_term_win = nvim_open_win(buf, v:true, opts)
  " Styling
  hi FloatWinBorder guifg=#87bb7c
  call setwinvar(s:float_term_border_win, '&winhl', 'Normal:FloatWinBorder')
  call setwinvar(s:float_term_win, '&winhl', 'Normal:Normal')
  if a:0 == 0
    terminal
  else
    call termopen(a:1)
  endif
  startinsert
  " Close border window when terminal window close
  autocmd TermClose * ++once :bd! | call nvim_win_close(s:float_term_border_win, v:true)
endfunction