;;; init.el --- tastytea's Emacs init file.
;;; Time-stamp: <2019-03-27 09:46:04 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)
(setq package-archive-priorities '(("gnu"          . 1)
                                   ("melpa-stable" . 2)
                                   ("melpa"        . 3)))

(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 for startup-file.
;; (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 7 days have passed.
(use-package auto-package-update
  :custom
  (auto-package-update-delete-old-versions t)
  (auto-package-update-interval 7)
  (auto-package-update-hide-results nil)
  :config
  (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/backups/ and keep more versions.
(setq backup-directory-alist
      `(("." . ,(concat user-emacs-directory "backups"))))
(setq delete-old-versions t             ; Delete old backups.
      kept-new-versions 6               ; Keep 6 newest backups.
      backup-by-copying t               ; Copy to backup folder.
      version-control t)                ; Append version numbers to file names.
;; Save auto-saves in ~/.emacs.d/backups/.
(setq auto-save-file-name-transforms
      `((".*" ,(concat user-emacs-directory "backups/") t)))

;; Set some personal information.
(setq user-full-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"))

;; Scroll 1 line at a time.
(setq mouse-wheel-scroll-amount '(1 ((shift) . 1)))
;; ;; Never recenter cursor while scrolling.
;; (setq scroll-conservatively 101)

;; Scroll before cursor has reached top/bottom.
;; Way too slow with fci-mode and highlight-indent-guides activated.
(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 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(use-package bind-key
  :config
  (bind-keys
   ;; Scroll in other window.
   ("S-<prior>" . scroll-other-window-down)
   ("S-<next>"  . scroll-other-window)
   ;; Switch window
   ("C-<tab>" . other-window)
   ;; Reduce whitespace around cursor to 0 or 1, according to context.
   ("C-<delete>" . fixup-whitespace)
   ;; Scroll without moving the cursor.
   ("M-<down>" . scroll-up-line)
   ("M-<up>" . scroll-down-line)))

;;;;;;;;;;;;;;;;;;;; Programming / C++ ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(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)))
    (rtags-enable-standard-keybindings)
    :bind
    (:map c-mode-base-map
          ("M-." . rtags-find-symbol-at-point)
          ("M-," . rtags-find-references-at-point)
          ("M-?" . rtags-display-summary))
    :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)
  :config
  ;; ensure that we use only rtags checking.
  ;; https://github.com/Andersbakken/rtags#optional-1
  (defun my/setup-flycheck-rtags ()
    (flycheck-select-checker 'rtags)
    (setq-local flycheck-highlighting-mode nil))  ; Can't disable RTags overlay.
  :hook
  (c-mode-hook   . my/setup-flycheck-rtags)
  (c++-mode-hook . my/setup-flycheck-rtags))

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

;; cmake integration.
(unless slow-computer
  (use-package cmake-ide
    :after rtags
    :custom
    (cmake-ide-build-dir "build")
    :config
    (cmake-ide-setup)))

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

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

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

;; Fuzzy autocompletion for company.
(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)

;; Automatic 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 .")

    (defun my/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" . 'my/projectile-kill-buffers-and-change-tabbar-grouping))))

;; GUI for gdb and other debuggers.
(use-package realgud
  :config
  (defun my/load-realgud ()
    (load-library "realgud"))
  :hook
  (c++-mode . my/load-realgud)
  (c-mode   . my/load-realgud))

;; Highlight TODO, FIXME, NOTE and so on.
(use-package hl-todo
  :hook
  (prog-mode . hl-todo-mode))

;; 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)

;; Fold code.
(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
  :custom
  (highlight-indent-guides-method 'character)
  (highlight-indent-guides-responsive 'top)
  :hook
  (prog-mode . highlight-indent-guides-mode))

;; Tries to find structures and jumps to them.
(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)))

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

;; Neat modeline.
(use-package doom-modeline
  :after all-the-icons
  :init
  (column-number-mode t)                ; Show column numbers in modeline.
  :config
  (setq doom-modeline-minor-modes t)
  :hook
  (after-init . doom-modeline-mode))

;; Miscellaneous visual improvements.
(set-face-font 'default "Source Code Pro")
(global-hl-line-mode t)                 ; Highlight current line.
(size-indication-mode)                  ; Buffer size display in the modeline.
(show-paren-mode t)                     ; Visualize matching parens.
;; Show line numbers on the left side of the buffer.
(use-package display-line-numbers
  :if (>= emacs-major-version 26)
  :config
  (global-display-line-numbers-mode))

;; Colored man pages
(use-package man
  :defer t
  :custom-face
  (Man-overstrike ((t (:inherit font-lock-type-face :bold t))))
  (Man-underline  ((t (:inherit font-lock-keyword-face  :underline t)))))

;;;;;;;;;;;;;;;;;;;; Misc ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Show directory tree in a window.
(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)
  :bind
  ("<f8>" . neotree-toggle))

;; Git integration.
(unless slow-computer
  (use-package magit
    :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
  :init
  (defun my/set-fill-column-80 ()
    "Set fill-column to 80."
    (set-fill-column 80))
  :config
  ;; Fix bug with fci + company.
  (defun my/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 #'my/on-off-fci-before-company)
  :hook
  (prog-mode . my/set-fill-column-80)
  (conf-mode . my/set-fill-column-80)
  (prog-mode . fci-mode)
  (text-mode . fci-mode))

;; Interactive substring matching.
(use-package ido
  :defer 5
  :config
  (ido-mode t)
  (ido-everywhere t))

;; Flexible matching for ido.
(use-package flx-ido
  :after ido
  :custom
  (ido-enable-flex-matching t)
  (ido-ignore-extensions t)    ; Ignore extension like ~ and .o.
  (ido-use-virtual-buffers t)  ; Use history of recently opened buffers.
  (recentf-max-saved-items 20) ; Keep this number of buffers in history.
  :config
  (flx-ido-mode t))

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

;; Advanced tab bar.
(unless slow-computer
  (use-package tabbar-ruler
    :pin melpa                          ; Faces are not correctly applied,
    :after projectile                   ; version from >=2016-08-02 is needed.
    :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))))

;; Visualize whitespace.
(use-package whitespace
  :config
  (delete 'newline-mark whitespace-style) ; Don't paint $ at eol.
  (delete 'lines whitespace-style)        ; Don't paint lines red if too long.
  ;; Don't show dots in company menu.
  (defun my/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 #'my/on-off-whitespace-before-company)
  :bind
  ("C-x w" . 'whitespace-mode)
  :hook
  (prog-mode . whitespace-mode)
  (conf-mode . whitespace-mode)
  :custom-face
  (whitespace-space ((nil :foreground "gray18"))))

;; Spell checking.
(if (or (executable-find "aspell")
        (executable-find "hunspell")
        (executable-find "ispell"))
    (unless slow-computer
      (use-package flyspell
        :init
        (defun my/delete-flyspell-keybinding ()
            "Delete \"C-;\" keybinding because iedit needs it."
            (define-key flyspell-mode-map (kbd "C-;") nil))
        :custom
        (ispell-dictionary "english")
        :config
        (defun my/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)))
        :bind
        ("<f6>" . my/toggle-flyspell)
        :hook
        ;; Spellcheck comments.
        (prog-mode . flyspell-prog-mode)
        (flyspell-prog-mode . my/delete-flyspell-keybinding))))

;; 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 have the same name, append directory name after the filename.
(use-package uniquify
  :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"
  (setq midnight-period (* 1 60 60))          ; Clean every 1 hours.
  :custom
  (clean-buffer-list-delay-general 1)         ; Clean normal bufs after 1d.
  (clean-buffer-list-delay-special (* 30 60)) ; Clean special bufs after 30m.
  :config
  (setq 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
  :custom
  (time-stamp-format "%:y-%02m-%02d %02H:%02M:%02S %Z")
  :hook
  (before-save . time-stamp))

;; Edit multiple regions in the same way simultaneously.
(use-package iedit
  :bind
  ("C-;" . iedit-mode))

;; Mode for writing blog posts with hugo.
(if (string= (system-name) "ventiloplattform")
    (use-package easy-hugo
      :custom
      (easy-hugo-basedir "~/Projekte/www/blog.tastytea.de/")
      (easy-hugo-url "https://blog.tastytea.de")
      (easy-hugo-previewtime "300")
      (easy-hugo-postdir "content/posts")
      (easy-hugo-default-ext ".adoc")
      :bind
      ("C-c h" . easy-hugo)
      :mode
      ;; The mode is not turned on?
      ("\\`'\\*Easy-hugo\\*\\'" . easy-hugo-mode)))

;; Automatically insert text in new files.
(use-package autoinsert
  :init
  ;; I only use it in here for now
  (use-package yasnippet)

  (defun my/autoinsert-yas-expand()
    "Replace text in yasnippet template."
    (yas-minor-mode t)
    (yas-expand-snippet (buffer-string) (point-min) (point-max)))
  :config
  (add-to-list 'auto-insert-alist
               '(("\\.\\(cpp\\|cc\\|cxx\\|c\\+\\+\\)\\'" . "C++ program") .
                 ["cpp" my/autoinsert-yas-expand]))
  (add-to-list 'auto-insert-alist
               '(("\\.\\(hpp\\|hh\\|hxx\\|h\\+\\+\\)\\'" . "C++ header") .
                 ["hpp" my/autoinsert-yas-expand]))
  (add-to-list 'auto-insert-alist
               '(("\\.[1-9]\\.adoc\\'" . "AsciiDoc manpage") .
                 ["manpage.adoc" my/autoinsert-yas-expand]))
  :custom
  (auto-insert-directory (concat user-emacs-directory "auto-insert"))
  (auto-insert-query nil)               ; Don't ask before inserting.
  :hook
  (find-file . auto-insert))

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

(use-package markdown-mode
  :custom
  (markdown-command "cmark")
  :mode
  (("README\\.md\\'" . gfm-mode)
   ("\\.md\\'" . markdown-mode)
   ("\\.markdown\\'" . markdown-mode))
  :hook
  (markdown-mode . visual-line-mode)
  )

(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.
(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
      :defer 5
      :init
      (setq server-use-tcp t
            server-port 51313
            server-auth-key ; 64 chars, saved in ~/.emacs.d/server/server.
            "phahw2ohVoh0oopheish7IVie9desh8aequeenei3uo8wahShe%thuadaeNa4ieh")
      :config
      (unless (server-running-p)
        (server-start))
      )))

;; Set garbage collection threshold to original value.
(setq gc-cons-threshold (car (get 'gc-cons-threshold 'standard-value)))

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