dotfiles/emacs/.emacs.d/config/init-python.el

;; -*- lexical-binding: t; -*-

;; Python configuration
(use-package python
  :defer t
  :straight (:type built-in)
  :config
  (add-hook 'python-mode-hook #'highlight-indent-guides-mode)
  ;; Redefine the python-mypy flycheck checker to account for projectile-compilation-dir
  (flycheck-define-checker python-mypy
    "Mypy syntax and type checker.  Requires mypy>=0.580.

  See URL `http://mypy-lang.org/'."
    :command ("mypy"
              "--show-column-numbers"
              (config-file "--config-file" flycheck-python-mypy-config)
              (option "--cache-dir" flycheck-python-mypy-cache-dir)
              source-original)
    :error-patterns
    ((error line-start (file-name) ":" line (optional ":" column)
            ": error:" (message) line-end)
     (warning line-start (file-name) ":" line (optional ":" column)
              ": warning:" (message) line-end)
     (info line-start (file-name) ":" line (optional ":" column)
           ": note:" (message) line-end))
    :modes python-mode
    ;; Ensure the file is saved, to work around
    ;; https://github.com/python/mypy/issues/4746.
    :predicate flycheck-buffer-saved-p
    :working-directory (lambda (checker)
                         (or (projectile-compilation-dir)
                             default-directory))))

;; pyvenv to track virtual environments
(use-package pyvenv
  :defer 3
  :config
  (pyvenv-mode)
  (pyvenv-tracking-mode))

;; pyenv to track Python version
(use-package pyenv-mode
  :defer t)

;; LSP using Microsoft's pyright language server
(use-package lsp-pyright
  :hook (python-mode . (lambda ()
                         (require 'lsp-pyright)
                         (lsp-deferred)))
  :custom
  (lsp-pyright-use-library-code-for-types t)
  (lsp-pyright-multi-root nil)
  :general
  (python-mode-map "C-c C-d" #'lsp-describe-thing-at-point))

(provide 'init-python)