.emacs.d/init.el

;;; init.el --- tastytea's Emacs init file.
;;; Time-stamp: <2019-03-22 02:59:31 CET>

;;; 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)

;; autocompile files as needed.
(use-package auto-compile
  :init
  ;; Use uncompiled file if it is newer than the compiled one
  (setq load-prefer-newer t)
  :config
  (auto-compile-on-load-mode))

;; ;; 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 ;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Set garbage collection threshold to 100 MiB (or 20 MiB) to speed up init
;; It is reset at the end of the file
(if slow-computer
    (setq gc-cons-threshold (* 20 1024 1024))
  (setq gc-cons-threshold (* 100 1024 1024)))

;; 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
(use-package saveplace
  :config
  (save-place-mode t))

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

;; Save minibuffer history
(savehist-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")

;; kill-region (cut) and kill-ring-save (copy) act on the current line if no
;; text is visually selected
;; https://www.emacswiki.org/emacs/WholeLineOrRegion
(put 'kill-ring-save 'interactive-form
     '(interactive
       (if (use-region-p)
           (list (region-beginning) (region-end))
         (list (line-beginning-position) (line-beginning-position 2)))))

(put 'kill-region '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"))

;; Scoll 1 line at a time
(setq mouse-wheel-scroll-amount '(1 ((shift) . 1)))

;; Scroll before cursor has reached top/bottom
(use-package smooth-scrolling
  :config
  (smooth-scrolling-mode 1))

;; Paste text where the cursor is, not where the mouse is.
(setq mouse-yank-at-point t)

;; Put scrollbar to the right side
(if (display-graphic-p)
    (set-scroll-bar-mode 'right))

;;;;;;;;;;;;;;;;;;;; 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)
;; Scroll without moving the cursor
(global-set-key (kbd "M-<down>") 'scroll-up-line)
(global-set-key (kbd "M-<up>") 'scroll-down-line)

;;;;;;;;;;;;;;;;;;;; Programming / C++ ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(use-package rtags
  :unless slow-computer
  :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)
  :demand t
  :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))

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

;;;;;;;;;;;;;;;;;;;; Programming / other ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Online documentation mode
(use-package eldoc
  :hook
  (prog-mode . turn-on-eldoc-mode))

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

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

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

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

;; Project management
(use-package projectile
  :unless slow-computer
  :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 .")

  (defun projectile-kill-buffers-and-change-tabbar-grouping ()
    "Kill project buffers and change tabbar-ruler grouping to user-buffers."
    (interactive)
    (projectile-kill-buffers)
    (tabbar-ruler-group-user-buffers))
  :bind
  ("C-c p" . 'projectile-command-map)
  (:map projectile-command-map
        ("k" . 'projectile-kill-buffers-and-change-tabbar-grouping)))

;; 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
  :defer 2
  :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
(use-package fold-dwim
  :bind
  ("<f7>"  . fold-dwim-toggle)
  ("C-x t" . fold-dwim-toggle)
  :hook
  (prog-mode . hs-minor-mode))

;; Highlight indentation levels
(use-package highlight-indent-guides
  :config
  (setq highlight-indent-guides-method 'character
        highlight-indent-guides-responsive 'top)
  :hook
  (prog-mode . highlight-indent-guides-mode))

(use-package imenu-anywhere
  :after ido-completing-read+
  :bind
  ("M-i" . imenu-anywhere))

;;;;;;;;;;;;;;;;;;;; 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
(use-package doom-themes
  :unless slow-computer
  :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
  :init
  ;; Show column numbers in modeline
  (column-number-mode t)
  :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)
(if (>= emacs-major-version 26)
    (use-package display-line-numbers
      :config
      (global-display-line-numbers-mode)))
(size-indication-mode)
(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))

(use-package magit
  :unless slow-computer
  :init
  (use-package git-commit)
  :config
  (defun my-magit-kill-buffers (arg)
    "Restore window configuration and kill all Magit buffers."
    (interactive)
    (let ((buffers (magit-mode-get-buffers)))
      (magit-restore-window-configuration)
      (mapc #'kill-buffer buffers)))
  :bind
  ("C-x g"   . magit-status)
  ("C-x M-g" . magit-dispatch)
  ;; (:map magit-status-mode-map
  ;;       ("q"       . my-magit-kill-buffers))
  :custom
  ;; What's better, mapping q or binding the function here?
  (magit-bury-buffer-function 'my-magit-kill-buffers))

;; 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 t)))
  ;; (global-fci-mode t)

  ;; Fix bug with fci + company
  (defun on-off-fci-before-company(command)
    (when (string= "show" command)
      (turn-off-fci-mode))
    (when (string= "hide" command)
      (turn-on-fci-mode)))
  (advice-add 'company-call-frontends :before #'on-off-fci-before-company)
  ;; Add global fci-mode
  :hook
  (prog-mode . fci-mode)
  (text-mode . fci-mode)
  :custom
  (fci-rule-column 80))

;; Interactive substring matching
(use-package ido
  :defer 1
  :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 history of recently opened buffers

;; Replaces stock emacs completion with ido completion wherever it is possible
(use-package ido-completing-read+
  :unless slow-computer
  :after ido
  :config
  (ido-ubiquitous-mode t))

;; Tab bar
(use-package tabbar-ruler
  :unless slow-computer
  :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

  ;; 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)

  (add-hook 'projectile-after-switch-project-hook ; Does not work under :hook
            'tabbar-ruler-group-by-projectile-project)
  :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) ; $ at eol
  (delete 'lines whitespace-style)        ; Don't paint lines red if too long.
  ;; Don't show dots in company menu
  (defun on-off-whitespace-before-company(command)
    (when (string= "show" command)
      (whitespace-mode -1))
    (when (string= "hide" command)
      (whitespace-mode t)))
  (advice-add 'company-call-frontends
              :before #'on-off-whitespace-before-company)
  :bind
  ("C-x w" . 'whitespace-mode)
  :hook
  (prog-mode . whitespace-mode)
  :custom-face
  (whitespace-space ((nil :foreground "gray18"))))

;; 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))

;; If 2 files with same name, append directory name after the filename
(use-package uniquify
  :defer 1
  :ensure nil                           ; Included in emacs
  :custom
  (uniquify-after-kill-buffer-p t)
  (uniquify-buffer-name-style 'post-forward)
  (uniquify-strip-common-suffix t))

;; Delete old buffers
;; https://www.emacswiki.org/emacs/CleanBufferList
(use-package midnight
  :init
  (setq midnight-delay 0)                         ; 0 seconds after "midnight"
  :config
  (setq midnight-period (* 1 60 60)               ; Clean every 1 hours
        clean-buffer-list-delay-general 1         ; Clean normal bufs after 1d
        clean-buffer-list-delay-special (* 30 60) ; Clean special bufs after 30m
        clean-buffer-list-kill-regexps            ; Add these to special buffers
        (nconc clean-buffer-list-kill-regexps
               '("\\`magit-?.*:"
                 "\\.log\\'")))
  (midnight-mode t))

;; The string Time-stamp: <> in the first 8 lines of the file will be updated
;; with the current timestamp.
(use-package time-stamp
  :config
  (setq time-stamp-format "%:y-%02m-%02d %02H:%02M:%02S %Z")
  :hook
  (before-save . time-stamp))

;;;;;;;;;;;;;;;;;;;; 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
  :mode
  (("/cron\\.d/" . crontab-mode))
  ("\\`'/etc/crontab\\'" . crontab-mode))

(use-package nginx-mode
  :defer t)

(use-package company-nginx
  :after nginx-mode
  :hook
  (nginx-mode . company-nginx-keywords))

;;;;;;;;;;;;;;;;;;;; Server / Remote editing ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Edit remote files
(use-package tramp
  :unless slow-computer
  :defer 1
  :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
      :defer 1
      :init
      (setq server-use-tcp t
            server-port 51313
            server-auth-key
            "phahw2ohVoh0oopheish7IVie9desh8aequeenei3uo8wahShe%thuadaeNa4ieh")
      :config
      (unless (server-running-p)
        (server-start))
      )))

;; Set garbage collection threshold to 2 MiB
(setq gc-cons-threshold (* 2 1024 1024))
(provide 'init)
;;; init.el ends here