init.el

;;; init.el --- Emacs Configuration -*- lexical-binding: t -*-
(defconst emacs-start-time (current-time))
(defconst mmdc-path "/home/alex/.npm-packages/bin/mmdc")

(require 'package)

(setq package-archives '(("melpa" . "https://melpa.org/packages/")
                         ("org"   . "https://orgmode.org/elpa/")
                         ("elpa"  . "https://elpa.gnu.org/packages/")))

(package-initialize)
(unless package-archive-contents
  (package-refresh-contents))

(unless (package-installed-p 'use-package)
  (package-install 'use-package))

(setq auto-save-default nil
      create-lockfiles  nil
      make-backup-files nil)

(global-auto-revert-mode 1)

(set-language-environment "UTF-8")
(set-default-coding-systems 'utf-8)

(setq-default truncate-lines t)

(use-package whitespace
  :init
  (setq sentence-end-double-space nil
        whitespace-style '(face empty trailing))

  (setq-default indent-tabs-mode nil)

  (global-whitespace-mode)
  (add-hook 'before-save-hook #'whitespace-cleanup))

(scroll-bar-mode -1)
(tool-bar-mode -1)
(menu-bar-mode -1)
(blink-cursor-mode -1)

(setq inhibit-startup-message t)

(use-package ibuffer
  :bind (("C-x C-b" . ibuffer))
  :config
  (setq ibuffer-use-other-window t))

(use-package icomplete
  :init
  (fido-mode 1))

(set-face-attribute 'default nil :font "Ubuntu Mono" :height 125)
(set-face-attribute 'fixed-pitch nil :font "Ubuntu Mono" :height 125)
(set-face-attribute 'variable-pitch nil :font "Ubuntu Light" :height 125)

(use-package all-the-icons
  :ensure t)

(global-display-line-numbers-mode 1)

(dolist (hook '(doc-view-mode-hook
                eshell-mode-hook
                gfm-mode-hook
                org-mode-hook
                shell-mode-hook
                term-mode-hook))
  (add-hook hook (lambda () (display-line-numbers-mode 0))))

(use-package doom-modeline
  :ensure t
  :init (doom-modeline-mode 1)
  :config
  (column-number-mode 1)
  (size-indication-mode 1)
  (setq doom-modeline-buffer-file-name-style 'relative-to-project
        doom-modeline-buffer-modification-icon t
        doom-modeline-buffer-state-icon t
        doom-modeline-height 25
        doom-modeline-major-mode-icon t
        doom-modeline-major-mode-color-icon nil
        doom-modeline-minor-modes nil))

(use-package tab-bar
  :config
  (setq tab-bar-show nil))

(use-package modus-themes
  :ensure t
  :bind ("<f5>" . modus-themes-toggle)
  :init
  (setq modus-themes-diffs              'desaturated
        modus-themes-headings           '((t . rainbow-section-no-bold))
        modus-themes-intense-hl-line    t
        modus-themes-lang-checkers      'straight-underline
        modus-themes-links              'faint-neutral-underline
        modus-themes-org-blocks         'grayscale
        modus-themes-paren-match        'intense-bold
        modus-themes-region             'bg-only-no-extend
        modus-themes-scale-headings     t
        modus-themes-slanted-constructs t)

  ;; Default to the light theme
  (modus-themes-load-operandi)

  (show-paren-mode 1))

(defun me/buffer-select-by-major-mode (mode)
  "A filter for use with `display-buffer-alist', will select a
  buffer if it matches the given major-mode"
  (lambda (buffer action)
    (with-current-buffer buffer
      (eq major-mode mode))))

(defun me/display-tabbed-buffer-in-side-window (buffer alist)
  "See `display-buffer-in-side-window'"
  (display-buffer-in-side-window buffer alist)
  (with-current-buffer buffer
    (tab-line-mode)))

(defun me/display-buffer-in-panel (predicate)
  "Display buffers matching the given PREDICATE in the panel.

To borrow terminology from VSCode the panel is that collapsable
window at the bottom of the screen.
"
  `(,predicate
    (me/display-tabbed-buffer-in-side-window)
    (window-height . 0.25)
    (side . bottom)
    (slot . 0)
    (window-parameters . ((no-other-window . t)
                          (no-delete-other-windows . t)))))

(dolist (hook '(shell-mode-hook
                eshell-mode-hook))
  (add-hook hook (lambda () (tab-line-mode))))

(defun me/display-buffer-in-top-window (predicate)
  "Display buffers matching the given PREDICATE in a top side window."

  `(,predicate
      (display-buffer-in-side-window)
      (window-height . 0.2)
      (side . top)
      (slot . 0)
      (window-parameters . ((no-other-window . t)))))


(use-package window
  :init
  (setq window-sides-vertical t)
  (setq display-buffer-alist `(,(me/display-buffer-in-panel "\\*Help\\*")
                               ,(me/display-buffer-in-panel "\\*Messages\\*")
                               ,(me/display-buffer-in-panel "\\*\\(e?shell\\)\\*")
                               ("\\*Process List\\*"             ;; Setting no-other-window etc seems to break C-x C-c
                                (display-buffer-in-side-window)  ;; Error => Wrong type argument window-live-p, nil...
                                (side . bottom)
                                (slot . 0)
                                (window-height . 0.25))
                               ,(me/display-buffer-in-panel
                                 (me/buffer-select-by-major-mode 'compilation-mode))
                               ,(me/display-buffer-in-top-window "\\*Completions\\*")
                               ,(me/display-buffer-in-panel "\\*Ibuffer\\*")
                               (,(me/buffer-select-by-major-mode 'dired-mode)
                                (display-buffer-in-side-window)
                                (window-width . 0.15)
                                (side . left)
                                (slot . 0)
                                (window-parameters . ((no-other-window . t))))
                               ("\\*elfeed-entry\\*"
                                 (display-buffer-reuse-mode-window display-buffer-at-bottom)
                                 (window-height . 0.8))
                               ,(me/display-buffer-in-panel
                                 (me/buffer-select-by-major-mode 'inferior-python-mode))
                               ))
  :bind (("<f8>" . window-toggle-side-windows)))

(defun me/dired-open-directory ()
  (interactive)
  (dired default-directory))

(defun me/dired-mode-tweaks ()
  (dired-hide-details-mode))

(use-package dired
  :bind (("C-x d" . me/dired-open-directory))
  :hook (dired-mode . me/dired-mode-tweaks))

(defun me/elfeed-start-new-tab ()
  "Does the work of creating a new tab"
  (tab-bar-new-tab)
  (tab-bar-rename-tab "elfeed")
  (elfeed))

(defun me/elfeed-start ()
  "Switch to the elfeed tab, create one if it doesn't exist."
  (interactive)
  (let ((tabs (mapcar (lambda (tab) (alist-get 'name tab)) (tab-bar-tabs))))
    (if (member "elfeed" tabs)
        (tab-bar-select-tab-by-name "elfeed")
      (me/elfeed-start-new-tab))))

(defun me/feed-table-row-to-item (row)
  "Convert a ROW from a feed table into a valid elfeed entry"
  (let* ((url     (car row))
         (tags    (split-string (cadr row) " ")))

    (append (list url) (mapcar 'make-symbol tags))))

(defun me/feed-table-to-list (feed-table)
  "Convert an orgmode FEED-TABLE to a list compatible with elfeed."
  (mapcar 'me/feed-table-row-to-item feed-table))


(defun me/feed-table-extract ()
  "Find the table called `elfeed-feed-table' in my config file
and use it to set the `elfeed-feeds' variable."
  (with-temp-buffer
    (insert-file-contents "/home/alex/.emacs.d/README.org")
    (org-table-map-tables (lambda ()
                            (setq tbl-name (plist-get (cadr (org-element-at-point)) :name))
                            (if (string= tbl-name "elfeed-feed-table")
                                (let ((tbl (cdr (cdr (org-table-to-lisp)))))
                                  (setq elfeed-feeds (me/feed-table-to-list tbl)))))
                          t)))

(defun me/elfeed-update (arg)
  "Refresh all RSS feeds.

  This simply calls `elfeed-update' unless the prefix arg is set
  or `elfeed-feeds' is nil in which case it will call
  `me/feed-table-extract' beforehand."
  (interactive "P")
  (if (or (not (null arg))
              (null elfeed-feeds))
      (me/feed-table-extract))
  (elfeed-update))

(use-package elfeed
  :bind (("C-c e" . me/elfeed-start)
         :map elfeed-search-mode-map
         ("g" . me/elfeed-update)
         :map elfeed-show-mode-map
         ("q" . delete-window))
  :ensure t
  :config
  (setq elfeed-use-curl t)
  (setq elfeed-show-entry-switch 'pop-to-buffer)
  (setq elfeed-show-entry-delete 'delete-window))

(use-package git-gutter
  :config
  (global-git-gutter-mode 1)

  (set-face-foreground 'git-gutter:added "forest green")
  (set-face-foreground 'git-gutter:modified "goldenrod")
  (set-face-foreground 'git-gutter:deleted "brown")

  (setq git-gutter:added-sign "▐"
        git-gutter:modified-sign "▐"
        git-gutter:removed-sign "▐"))

(use-package magit
  :bind (("C-x g" . magit-status)))

(use-package lsp-mode
  :ensure t
  :init
  (setq lsp-keymap-prefix "C-c l")
  :hook ((python-mode . lsp))
  :commands lsp)

(use-package ob-mermaid
  :ensure t
  :config
  (setq ob-mermaid-cli-path mmdc-path))

(defun me/org-mode-tweaks ()
  (setq-local fill-column 80)
  (turn-on-auto-fill)
  (flyspell-mode)

  (variable-pitch-mode 1)

  ;; Switch certain elements back to fixed pitch
  (set-face-attribute 'org-block nil :foreground nil :inherit 'fixed-pitch)
  (set-face-attribute 'org-link nil :inherit '(button fixed-pitch))
  (set-face-attribute 'org-code nil :inherit '(shadow fixed-pitch))
  (set-face-attribute 'org-table nil :inherit '(shadow fixed-pitch))
  (set-face-attribute 'org-verbatim nil :inherit '(shadow fixed-pitch))
  (set-face-attribute 'org-special-keyword nil
                      :inherit '(font-lock-comment-face fixed-pitch))
  (set-face-attribute 'org-meta-line nil
                      :inherit '(font-lock-comment-face fixed-pitch))
  (set-face-attribute 'org-checkbox nil :inherit 'fixed-pitch))

(use-package org
  :hook (org-mode . me/org-mode-tweaks)
  :bind (("C-c a" . org-agenda)
         ("C-c c" . org-capture))
  :config
  (setq org-directory "~/Documents/org/")
  (setq org-agenda-files (list org-directory))
  (org-babel-do-load-languages 'org-babel-load-languages
                               '((emacs-lisp . t)
                                 (python . t)
                                 (shell . t)))
  (setq org-capture-templates
        '(("t" "Task" entry (file+headline "life.org" "Events")
           "* TODO %?\n")
          ("e" "Event" entry (file+headline "life.org" "Events")
           "* %?\nSCHEDULED: %^t")
          ("j" "Journal" entry (file+headline "life.org" "Journal")
           "* %u\n%?\n\n** Exercise\n" :prepend t)))
  (add-to-list 'org-modules 'org-habit t)
  (setq org-adapt-indentation 'headline-data
        org-habit-show-all-today t
        org-log-into-drawer t))

(defun me/project-search ()
  "Execute a project wide search with ripgrep."
  (interactive)
  (let ((dir   (cdr (project-current t)))
        (query (read-string "Search query: ")))
    (rg query "*" dir)))

(use-package rg
  :ensure t)

(use-package project
  :bind (("C-x p f" . project-find-file)
         ("C-x p s" . me/project-search)))

(defun me/start-debugging ()
  (interactive)
  (let ((program (read-string "Debug program: ")))
    (tab-new)
    (setq gdb-many-windows t)
    (gdb (format "gdb -i=mi %s" program))))

(advice-add 'gud-sentinel :after
            (lambda (proc msg)
              (when (memq (process-status proc) '(signal exit))
                (tab-close))))

(use-package cc-mode
  :bind (:map c-mode-map
              ("C-c d" . me/start-debugging)
              ("C-c g" . recompile))
  :config
  (setq-default c-basic-offset 4)
  (setq compilation-scroll-output t))

(defun me/python-mode-tweaks ()
  (setq-local fill-column 88))

(defun me/python-open-repl ()
  "Open a Python REPL in the correct virtualenv for the
  project.

This will first look for Jupyter and will fall back to Python if
it's not installed.

It will attempt to find the root folder for the current package
and open the shell there.
"
  (interactive)
  (let* ((dir   (cdr (project-current t)))
         (paths (list
                   (concat dir ".env/bin/jupyter")
                   (concat dir ".env/bin/python")))
         (path  (car (seq-filter 'file-exists-p paths))))

    (setq python-shell-interpreter path
          python-shell-prompt-detect-failure-warning nil)

    (if (string-match-p (regexp-quote "jupyter") path)
        (setq python-shell-interpreter-args "console --simple-prompt")
      (setq python-shell-interpreter-args "-i"))

    (let* ((package-dir (me/python-find-setup-py
                         (buffer-file-name (current-buffer))))
           (default-directory (file-name-directory package-dir)))
      (run-python))))
(defun me/python-flake8-project ()
  "Run flake8 on the current project in a compilation buffer.

This function will attempt to find the setup.py file for the
package currently being edited using `me/python-find-setup-py'.
If a filepath is found, its parent directory is assumed to be the
package root and flake8 will be run in a compilation buffer via
`compilation-start'."
  (interactive)
  (let* ((filename (buffer-file-name (current-buffer)))
         (setup-py (me/python-find-setup-py filename)))
    (unless (null setup-py)
      (let ((default-directory (file-name-directory setup-py)))
        (compilation-start "flake8" nil
                           (lambda (_modename)
                             (format "%s: flake8" default-directory)))))))

(defun me/python-find-setup-py--from-dir (dir)
  (if (string= dir "/")
      nil
    (let* ((setup-py (concat dir "setup.py")))
      (if (file-exists-p setup-py)
          setup-py
        (me/python-find-setup-py
         (file-name-directory (directory-file-name dir)))))))

(defun me/python-find-setup-py (filename)
  "Find the setup.py file that corresponds with the package that
contains FILENAME"
  (me/python-find-setup-py--from-dir
   (file-name-directory filename)))


(use-package blacken
  :ensure t
  :hook (python-mode . blacken-mode))

(use-package python
  :bind (:map python-mode-map
              ("C-c C-p" . me/python-open-repl)
              ("C-c g"   . recompile))
  :hook (python-mode . me/python-mode-tweaks)
  :config
  (setq compilation-scroll-output t)
  (add-to-list 'python-shell-completion-native-disabled-interpreters
               "jupyter"))

(use-package mermaid-mode
  :ensure t
  :config
  (setq mermaid-mmdc-location mmdc-path))

(defun me/gfm-mode-tweaks ()
  (setq-local fill-column 80)
  (turn-on-auto-fill)
  (flyspell-mode)

  (variable-pitch-mode 1)

  ;; Switch certain elements back to fixed pitch
  (set-face-attribute 'markdown-metadata-key-face nil :inherit 'fixed-pitch)
  (set-face-attribute 'markdown-metadata-value-face nil :inherit 'fixed-pitch))

(use-package markdown-mode
  :ensure t
  :hook (gfm-mode . me/gfm-mode-tweaks)
  :mode (("\\.md\\'" . gfm-mode)
         ("\\.markdown\\'" . gfm-mode)))

(setq custom-file "~/.emacs.d/custom.el")
(load custom-file 'noerror)

(let ((startup-time
       (float-time (time-subtract (current-time) emacs-start-time))))
  (message "Loaded configuration in %.3fs" startup-time))