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)))
  (add-to-list 'flycheck-disabled-checkers 'python-flake8))

;; Run a python repl at the project root
(defun projectile-run-python ()
  (interactive)
  (let ((default-directory (projectile-project-root)))
    (call-interactively #'run-python)))

(with-eval-after-load 'projectile
  (general-def projectile-command-map
    "s p" #'projectile-run-python
    "x p" #'projectile-run-python))

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

;; pyenv to track Python version
(use-package pyenv
  :straight (:host github :repo "aiguofer/pyenv.el")
  :if (executable-find "pyenv")
  :defer 3
  :init
  (setq pyenv-executable (executable-find "pyenv"))
  :config
  ;; Patch version alias stuff I don't use to stop spamming messages
  (defun pyenv--version-alias-file ()
    "Get peynv version alias file path."
    (when pyenv-use-alias
      (pyenv--call-process "version-alias-file")))
  (global-pyenv-mode)
  (defun pyenv-switch-buffer-hook (prev curr)
    (pyenv-use-corresponding))
  (defun pyenv-use-corresponding-vterm-hook ()
    (when (eq major-mode 'vterm-mode)
      (vterm-send-C-e)
      (vterm-send-C-u)
      (vterm-send-string (format "export PYENV_VERSION=%s\n" (getenv "PYENV_VERSION")))))
  (add-hook 'switch-buffer-functions #'pyenv-switch-buffer-hook)
  (add-hook 'eshell-directory-change-hook #'pyenv-use-corresponding)
  (add-hook 'pyenv-mode-hook #'pyenv-use-corresponding-vterm-hook)
  :custom
  (pyenv-show-active-python-in-modeline nil))

;; A pipenv integration
(use-package pipenv
  :defer 2
  :hook (python-mode . pipenv-mode))

;; 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 t)
  :general
  (python-mode-map "C-c C-d" #'lsp-describe-thing-at-point))

;; isort to sort Python imports
(use-package py-isort
  :commands (py-isort-buffer py-isort-region)
  :config
  (setq py-isort-options '("-m=3"))
  :general
  (python-mode-map "C-c C-i" #'py-isort-buffer))

(provide 'init-python)