custom mode for navigating mypy output

mypy-report-mode.el

;;; mypy-mode.el --- Navigate Mypy Output in Emacs

;; Copyright (C) 2023 Kaiyu Zheng

;; Author: Your Name <kaiyutony@gmail.com>
;; Keywords: convenience
;; Version: 0.0.1
;; Package-Requires: ((emacs "24.3"))

;;; Commentary:

;; This package provides a major mode for navigating mypy output in Emacs.
;; It is similar to `compilation-mode`, but the 'g' keybinding is changed to
;; reload the current buffer from disk (using `revert-buffer`) rather than
;; rerunning the compilation command.

;;; Code:

(defun mypy-revert-buffer ()
  "Reload the current buffer from disk."
  (interactive)
  (revert-buffer t t))

(define-derived-mode mypy-report-mode compilation-mode "Mypy"
  "Major mode for navigating Mypy output.")

(define-key mypy-report-mode-map (kbd "g") 'mypy-revert-buffer)

(provide 'mypy-report-mode)
;;; mypy-report-mode.el ends here

Configuration

Load the mode

(load "mypy-report-mode.el" nil t t)

Make screen splits the screen into top and bottom sections by default

(add-hook 'mypy-report-mode-hook
          (lambda ()
            (setq split-width-threshold nil)))

Load the mode by default when opening mypy_report (where mypy output is dumped)
(add-to-list 'auto-mode-alist '("mypy_report" . mypy-report-mode))