.emacs.d/init.el

;;; init.el --- tastytea's Emacs init file.

;;; Commentary:
;;; I am using this file with Emacs 26, but most of it will probably work with
;;; Emacs 24 and above.

;;; Code:

;;;;;;;;;;;;;;;;;;;; Packages ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require 'package)
;; (add-to-list 'package-archives
;;              '("melpa-stable" . "https://stable.melpa.org/packages/") t)
(add-to-list 'package-archives
             '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)

;; Add path for custom packages
(add-to-list 'load-path "~/.emacs.d/custom-packages/")

;; Install use-package if necessary
(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package))

(eval-when-compile
  (require 'use-package))

;; Always install packages if they are not present
(require 'use-package-ensure)
(setq use-package-always-ensure t)

;; ;; Benchmark initialization
;; (use-package benchmark-init
;;   :config
;;   ;; To disable collection of benchmark data after init is done.
;;   (add-hook 'after-init-hook 'benchmark-init/deactivate))

;; Update packages if at least auto-package-update-interval (7) days have passed
(use-package auto-package-update
  :config
  (setq auto-package-update-delete-old-versions t)
  ;; (setq auto-package-update-hide-results t)
  (auto-package-update-maybe))

;;;;;;;;;;;;;;;;;;;; Global variables ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Determine if we run on a slow computer
(defvar slow-computer nil)
(if (member (system-name) '("steuerbeamter" "azimuth" "localhost"))
    (setq slow-computer t))             ; localhost is schnibble

;;;;;;;;;;;;;;;;;;;; Configure some essential things ;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Accelerate startup by not printing so much
(setf inhibit-startup-screen t
      inhibit-startup-echo-area-message t
      inhibit-startup-message t)

;; Just type y/n instead of yes/no when prompted
(defalias 'yes-or-no-p 'y-or-n-p)

;; Hide toolbar
(tool-bar-mode -1)

;; Save cursor position
(save-place-mode 1)

;; Delete selection when you start to write
(delete-selection-mode t)

;; Save minibuffer history
(savehist-mode t)

;; Show column numbers in modeline
(column-number-mode t)

;; Save backups in ~/.emacs.d/ and keep more versions
(setq backup-directory-alist
      `(("." . ,(concat user-emacs-directory "backups"))))
(setq delete-old-versions t
      kept-new-versions 6
      ;; kept-old-versions 2
      version-control t)

;; Needed for do-all-symbols
(use-package cl)

;; Personal information
(setq user-login-name "tastytea"
      user-mail-address "tastytea@tastytea.de")

;; Region commands act on the current line if no text is visually selected
;; https://www.emacswiki.org/emacs/WholeLineOrRegion
(do-all-symbols (symbol)
  (when (and (commandp symbol t)
             (string-match-p "-region$\\|kill-ring-save" (symbol-name symbol)))
    (put symbol 'interactive-form
         '(interactive
           (if (use-region-p)
               (list (region-beginning) (region-end))
             (list (line-beginning-position) (line-beginning-position 2)))))))

;; Banish customizations to another file
(setq custom-file (concat user-emacs-directory "custom.el"))

;;;;;;;;;;;;;;;;;;;; Keybindings ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Scroll in other window
(global-set-key (kbd "S-<prior>") 'scroll-other-window-down)
(global-set-key (kbd "S-<next>") 'scroll-other-window)
;; Switch window
(global-set-key (kbd "C-<tab>") 'other-window)
;; Reduce whitespace around point to 0 or 1, according to context
(global-set-key (kbd "C-S-<delete>") 'fixup-whitespace)

;;;;;;;;;;;;;;;;;;;; Programming / RTags ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(unless slow-computer
  (use-package rtags
    :if (executable-find "llvm-config")
    :if (executable-find "clang++")
    :config
    (unless (and (rtags-executable-find "rc") (rtags-executable-find "rdm"))
      (progn
        (message "RTags is not installed!")
        (rtags-install)))

    (define-key c-mode-base-map (kbd "M-.") 'rtags-find-symbol-at-point)
    (define-key c-mode-base-map (kbd "M-,") 'rtags-find-references-at-point)
    (define-key c-mode-base-map (kbd "M-?") 'rtags-display-summary)
    (rtags-enable-standard-keybindings)
    :hook
    (c++-mode   . (rtags-start-process-unless-running))
    (c-mode     . (rtags-start-process-unless-running))
    (kill-emacs . rtags-quit-rdm)))

(use-package flycheck-rtags
  :after (flycheck rtags)
  :defer nil
  :config
  ;; ensure that we use only rtags checking
  ;; https://github.com/Andersbakken/rtags#optional-1
  (defun setup-flycheck-rtags ()
    (flycheck-select-checker 'rtags)
    (setq-local flycheck-highlighting-mode nil))  ; Can't disable RTags overlay
  :hook
  (c-mode-hook   . #'setup-flycheck-rtags)
  (c++-mode-hook . #'setup-flycheck-rtags))

(use-package company-rtags
  :after (company rtags)
  :config
  ;; (setq rtags-autostart-diagnostics t)
  ;; (rtags-diagnostics)
  (setq rtags-completions-enabled t)
  (push 'company-rtags company-backends))

;;;;;;;;;;;;;;;;;;;; Programming / other ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Syntax checking
(unless slow-computer
  (use-package flycheck
    :config
    (global-flycheck-mode)))

;; Autocompletion
(unless slow-computer
  (use-package company
    :hook
    (after-init . global-company-mode)))

;; Fuzzy autocompletion
(use-package company-flx
  :after company
  :config
  (company-flx-mode +1))

;; cmake integration
(unless slow-computer
  (use-package cmake-ide
    :config
    (setq cmake-ide-build-dir "build")
    (cmake-ide-setup)))

;; Indentation
(setq-default indent-tabs-mode nil
              tab-width 4)
(setq c-default-style "linux"
      c-basic-offset 4)

;; Project management
(unless slow-computer
  (use-package projectile
    :after neotree
    :config
    (projectile-mode +1)
    (setq projectile-switch-project-action 'neotree-projectile-action
          projectile-project-compilation-dir "build"
          projectile-project-configure-cmd
          "cmake -DCMAKE_BUILD_TYPE=Debug
          -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -G 'Unix Makefiles' .."
          projectile-project-compilation-cmd "cmake --build .")
    :bind
    ("C-c p" . 'projectile-command-map)))

;; Debugger
(use-package realgud
  :config
  (defun load-realgud ()
    (load-library "realgud"))
  :hook
  (c++-mode . load-realgud)
  (c-mode   . load-realgud))

;; Highlight TODO, FIXME, NOTE and so on.
(use-package hl-todo
  :config
  (global-hl-todo-mode t))

;; Better commenting
(use-package smart-comment
  :bind
  ("C-x c" . smart-comment))

;; Toggle betweeen beginning/end of line and beginning/end of code
(use-package mwim
  :bind
  ("<home>" . mwim-beginning-of-line-or-code)
  ("<end>"  . mwim-end-of-line-or-code))

;; Auto-type closing brackets
(electric-pair-mode t)

;; Folding
(add-hook 'prog-mode-hook #'hs-minor-mode)
(use-package fold-dwim
  :bind
  ("<f7>"  . fold-dwim-toggle)
  ("C-x t" . fold-dwim-toggle))


;;;;;;;;;;;;;;;;;;;; Appearance ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Icons (required by doom)
(use-package all-the-icons
  :config
  (unless (file-exists-p "~/.local/share/fonts/all-the-icons.ttf")
    (all-the-icons-install-fonts t)))

;; Theme
(unless slow-computer
  (use-package doom-themes
    :after (all-the-icons neotree)
    :config
    (load-theme 'doom-molokai t)
    (doom-themes-neotree-config)
    :custom
    (doom-neotree-file-icons 'icons)))

;; Modeline
(use-package doom-modeline
  :after all-the-icons
  :config
  (setq doom-modeline-minor-modes t)
  :hook (after-init . doom-modeline-mode))

;; Misc
(set-face-font 'default "Source Code Pro")
(global-hl-line-mode t)
(global-display-line-numbers-mode)
(size-indication-mode)
(setq show-trailing-whitespace t) ; Doesn't work with fill-column-indicator
(show-paren-mode t)

;;;;;;;;;;;;;;;;;;;; Misc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Directory tree
(use-package neotree
  :demand t
  :after all-the-icons
  :custom
  (neo-smart-open t)
  (neo-show-updir-line t)           ; Disabled by doom-themes?
  (neo-window-width 30)
  ;; (setq neo-theme (if (display-graphic-p) 'icons 'arrow))
  :bind
  ("<f8>" . neotree-toggle))

(unless slow-computer
  (use-package git-commit))
(use-package magit
  :bind
  ("C-x g"   . magit-status)
  ("C-x M-g" . magit-dispatch))

;; Draw line in column 80
(use-package fill-column-indicator
  :after company
  :config
  ;; TODO: Find out why I can't put this in :init or :config
  ;; (define-globalized-minor-mode global-fci-mode fci-mode
  ;;   (lambda () (fci-mode 1)))
  ;; (global-fci-mode t)
  :hook
  (prog-mode . fci-mode)
  (text-mode . fci-mode)
  :custom
  (fci-rule-column 80))

;; Interactive substring matching
(use-package ido
  :config
  (ido-mode t)
  (ido-everywhere t))

(use-package flx-ido
  :after ido
  :config
  (flx-ido-mode t)
  (setq ido-enable-flex-matching t
        ido-ignore-extensions t
        ido-use-virtual-buffers t)) ; Keep log of recently opened files

;; Tab bar
(unless slow-computer
  (use-package tabbar-ruler
    :after projectile
    :init
    (setq tabbar-ruler-global-tabbar t)
    :config
    ;; (tabbar-ruler-group-by-projectile-project) ; Group by projectile
    ;; (tabbar-ruler-group-buffer-groups)         ; Group by file type
    (tabbar-ruler-group-user-buffers)          ; Group by frame
    ;; (mode-icons-mode 0)                        ; Disable modeline symbols
    (setq tabbar-ruler-swap-faces nil)           ; Swap tab colors

    ;; I have to define these 2 times, don't know why.
    (set-face-attribute 'tabbar-selected nil
                        :background "gray11"
                        :foreground "light gray"
                        :family "Sans Serif"
                        :bold t)
    (set-face-attribute 'tabbar-unselected nil
                        :background "gray18"
                        :foreground "dark gray"
                        :family "Sans Serif"
                        :italic t)
    :bind
    ("C-<prior>" . 'tabbar-ruler-tabbar-backward-tab)
    ("C-<next>"  . 'tabbar-ruler-tabbar-forward-tab)
    :custom-face
    ;; I Have to define these 2 times, don't know why.
    (tabbar-selected (nil
                      :background "gray11"
                      :foreground "light gray"
                      :family "Sans Serif"
                      :bold t))
    (tabbar-unselected (nil
                        :background "gray18"
                        :foreground "dark gray"
                        :family "Sans Serif"
                        :italic t))))

;; Keybinding for whitespace, don't visualise newlines
(use-package whitespace
  :config
  (delete 'newline-mark whitespace-style)
  :bind
  ("C-x w" . 'whitespace-mode))

;; Spell checking
(use-package flyspell
  :config
  (defun toggle-flyspell ()
    "Toggle flyspell-mode and run flyspell-buffer after activating"
    (interactive)
    (if (bound-and-true-p flyspell-mode)
        (flyspell-mode 0)
      (flyspell-mode)
      (flyspell-buffer)))
  (setq ispell-dictionary "english")
  :bind
  ("<f6>" . toggle-flyspell)
  :hook
  (c++-mode . flyspell-prog-mode)
  (c-mode   . flyspell-prog-mode))

;; Multiple cursors
(use-package multiple-cursors
  :init
  (global-unset-key (kbd "M-<down-mouse-1>"))
  :bind
  ("C-x M-m"     . mc/edit-lines)
  ("M-<mouse-1>" . mc/add-cursor-on-click))

;;;;;;;;;;;;;;;;;;;; File formats ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(use-package adoc-mode
  :mode (("\\.adoc" . adoc-mode)))

(use-package markdown-mode
  :mode
  (("README\\.md\\'" . gfm-mode)
   ("\\.md\\'" . markdown-mode)
   ("\\.markdown\\'" . markdown-mode))
  :init
  (setq markdown-command "markdown2"))

(use-package crontab-mode
  :defer t
  :mode
  (("/cron\\.d/" . crontab-mode))
  ("/etc/crontab\\'" . crontab-mode))

(use-package nginx-mode
  :defer t)

(use-package company-nginx
  :after nginx-mode
  :config
  :hook
  (nginx-mode #'company-nginx-keywords))

;;;;;;;;;;;;;;;;;;;; Server / Remote editing ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Edit remote files
(unless slow-computer
  (use-package tramp
    :config
    ;; ssh is faster than scp and supports ports
    (setq tramp-default-method "ssh")
    ;; Add verification code support
    (customize-set-variable
     'tramp-password-prompt-regexp
     (concat
      "^.*"
      (regexp-opt
       '("passphrase" "Passphrase"
         "password" "Password"
         "Verification code")
       t)
      ".*:\0? *"))
    ;; Respect remote PATH
    (add-to-list 'tramp-remote-path 'tramp-own-remote-path)))

;; Run server if:
;; - Our EUID is not 0
;; - We are not logged in via SSH
;; - It is not already running
(unless (equal (user-real-uid) 0)
  (unless (getenv "SSH_CONNECTION")
    (use-package server
      :init
      (setq server-use-tcp t
            server-port 51313
            server-auth-key
            "phahw2ohVoh0oopheish7IVie9desh8aequeenei3uo8wahShe%thuadaeNa4ieh")
      :config
      (unless (server-running-p)
        (server-start))
      )))

(provide 'init)
;;; init.el ends here