[macOS Big Sur] dein.vim + syntastic + flake8 で vim上でpythonの文法チェックする

#flake8
https://pypi.org/project/flake8/
Pythonの文法チェックツール。
以下の3つのライブラリのラッパーとなる

• PyFlakes
• pycodestyle
• Ned Batchelder’s McCabe script

dein.vim

https://github.com/Shougo/dein.vim
dein.vim は vimプラグインマネージャー

syntastic

https://github.com/vim-syntastic/syntastic
vim における汎用シンタックスチェッカー

#flake8のインストール

% brew install flake8
% flake8 --version
3.9.2 (mccabe: 0.6.1, pycodestyle: 2.7.0, pyflakes: 2.3.1) CPython 3.9.6 on Darwin

#dein.vimとsyntasticのインストール

% cd /tmp
% curl https://raw.githubusercontent.com/Shougo/dein-installer.vim/master/installer.sh  > installer.sh
% sh ./installer.sh

既存の~/.vimrc 下記を追記

~/.vimrc

"----------------------------------------------------------
" Vim/Neovim plugin manager
" https://github.com/Shougo/dein.vim
"----------------------------------------------------------
"dein Scripts-----------------------------
if &compatible
  set nocompatible               " Be iMproved
endif

" Required:
set runtimepath+=~/.cache/dein/repos/github.com/Shougo/dein.vim

" Required:
if dein#load_state('~/.cache/dein')
  call dein#begin('~/.cache/dein')

  " Let dein manage dein
  " Required:
  call dein#add('~/.cache/dein/repos/github.com/Shougo/dein.vim')

  " Add or remove your plugins here like this:
  "call dein#add('Shougo/neosnippet.vim')
  "call dein#add('Shougo/neosnippet-snippets')

  " syntax checking plugin
  " https://github.com/vim-syntastic/syntastic
  call dein#add('scrooloose/syntastic')

  " Required:
  call dein#end()
  call dein#save_state()
endif

" Required:
filetype plugin indent on
syntax enable

" If you want to install not installed plugins on startup.
if dein#check_install()
  call dein#install()
endif

"End dein Scripts-------------------------

"----------------------------------------------------------
" syntastic
"----------------------------------------------------------
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

"----------------------------------------------------------
" flake8
"----------------------------------------------------------
let g:syntastic_python_checkers = ["flake8"]

実際に使用してlintしてくれるか確認する。

vim /tmp/test.py