.emacs.d/init.d/programming/common.el

;;; common.el --- Common programming settings. -*- lexical-binding: t; -*-

;; Time-stamp: <2020-01-25T05:33:07+0100>

;;; Commentary:

;;; Code:

(require 'basics/global-variables)

(use-package emacs
  :ensure nil

  :custom
  (compilation-scroll-output 'first-error)

  :config
  (setq-default indent-tabs-mode nil    ; Set default indentation.
                tab-width 4)
  (electric-pair-mode t)                ; Auto-type closing brackets.
  )

;; Guess indentation and if spaces or tabs are to be used.
(use-package dtrt-indent
  :after (editorconfig)

  :hook
  (dtrt-indent-mode . editorconfig-apply)
  (prog-mode . dtrt-indent-mode)
  )

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

;; Syntax checking with many plugins.
(unless slow-computer
  (use-package flycheck
    :defer nil
    :functions (flycheck-add-mode)

    :custom
    (flycheck-cppcheck-checks '("style" "warning" "information"))
    (flycheck-emacs-lisp-load-path 'inherit) ; Use load-path of Emacs.

    :config
    (global-flycheck-mode)
    ;; (setq flycheck-check-syntax-automatically '(save new-line mode-change))
    (flycheck-add-mode 'html-tidy 'web-mode)
    (flycheck-add-mode 'css-csslint 'web-mode)

    :bind
    (:map flycheck-mode-map
          ("<f5>" . flycheck-previous-error)
          ("<f6>" . flycheck-next-error)
          ("<f7>" . flycheck-list-errors)
          )
    )
  ) ; unless slow-computer.

;; Autocompletion mode with many plugins.
(unless slow-computer
  (use-package company
    :custom
    ;; Show suggestions after entering one character.
    (company-minimum-prefix-length 1)
    (company-selection-wrap-around t)   ; Wrap around at end/beginning of list.
    ; Align annotation to the right border.
    (company-tooltip-align-annotations t)
    (company-idle-delay 0)              ; No delay.

    :bind
    (:map company-active-map
          ("<return>" . nil)           ; Disable completion on return.
          ("RET" . nil)                ; https://emacs.stackexchange.com/a/13290
          ("<tab>" . company-complete-selection) ; Make tab work in lists (GUI).
          ("TAB" . company-complete-selection)   ; Same in terminals.
          )

    :hook
    (after-init . global-company-mode)
    )

;; Fuzzy autocompletion for company.
(use-package company-flx
  :after company

  :config
  (company-flx-mode +1)
  )

(use-package company-statistics
  :after company

  :hook
  (after-init . company-statistics-mode)
  )

;; Documentation popups for completions.
(use-package company-quickhelp
  :config

  (company-quickhelp-mode)
  )
) ; unless slow-computer.

;; Automatic project management.
(unless slow-computer
  (use-package projectile
    :after (treemacs ivy)

    :init
    (defvar my/cmake-compile-command    ; cmake command for compiling with 1
      (concat "cmake --build . -- -j"   ; core less than available.
              (substring (shell-command-to-string "nproc --ignore=1") 0 -1)))

    (defun my/switch-project ()
      "Add project to treemacs."
      (treemacs-add-and-display-current-project)
      (treemacs-collapse-other-projects)
      (treemacs-toggle-node))

    (defun my/projectile-kill-buffers ()
      "Kill project buffers and remove project from treemacs."
      (interactive)
      (projectile-kill-buffers)
        (let ((current-prefix-arg (projectile-project-name)))
          (treemacs-remove-project-from-workspace)))

    :custom
    (projectile-project-compilation-dir "build")
    (projectile-switch-project-action 'my/switch-project)
    (projectile-project-configure-cmd
     "cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
-GUnix\\ Makefiles ..")
    (projectile-completion-system 'ivy)

    :config
    (setq projectile-project-compilation-cmd
          (concat my/cmake-compile-command " && cd tests && ctest -Q"))
    (projectile-mode +1)

    ;; Mark variables as safe. This prevents prompts when using .dir-locals.el.
    (put 'projectile-project-compilation-cmd 'safe-local-variable #'stringp)
    (put 'projectile-project-configure-cmd 'safe-local-variable #'stringp)

    ;; Auto-search for projects.
    (if (f-directory? "~/Projekte")
        (setq projectile-project-search-path '("~/Projekte")))

    :bind
    ("C-c p" . 'projectile-command-map)
    ;; (:map projectile-command-map
    ;;       ("k" . 'my/projectile-kill-buffers))
    )
  ) ; unless slow-computer.

;; Highlight TODO, FIXME, NOTE and so on.
(use-package hl-todo
  :bind
  (:map hl-todo-mode-map
        ("C-c t" . hl-todo-occur))

  :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)
  )

;; Fold code.
(use-package fold-dwim
  :bind
  ("C-c f" . fold-dwim-toggle)

  :hook
  (prog-mode . hs-minor-mode)
  )

;; Highlight indentation.
(use-package hl-indent
  :custom-face
  (hl-indent-face ((t (:inherit hl-indent-face ; Reversed whitespace.
                                :background "gray18"
                                :foreground "#1c1e1f"
                                ))))

  :hook
  (prog-mode . hl-indent-mode)
  )

;; Tries to find points of interest in buffer and jumps to them.
(use-package imenu
  :custom
  (imenu-auto-rescan t)

  :bind
  ("M-i" . imenu)
  )

;; Tries to find points of interest in all open buffers and jumps to them.
(use-package imenu-anywhere
  :after (imenu ivy)

  :bind
  ("C-M-i" . ivy-imenu-anywhere)
  )

;; Jump to definition using grep.
(use-package dumb-jump
  :after (ivy)

  :custom
  (dumb-jump-selector 'ivy)

  :bind
  ("M-." . dumb-jump-go)        ; Will be overwritten by more intelligent modes.
  )

;; Support .editorconfig files.
(use-package editorconfig
  :config
  (editorconfig-mode 1)
  )

(use-package smerge
  :ensure nil                           ; Builtin.

  :defines (smerge-mode-map)

  :bind
  (:map smerge-mode-map
        ("<f5>" . smerge-prev)
        ("<f6>" . smerge-next)
        ("<f7>" . smerge-resolve)
        )
  )

;; Git integration.
(use-package git-commit
  :pin melpa
  )

(unless slow-computer
  ;; magit from melpa needs transient from melpa.
  (use-package transient
    :pin melpa)

  (use-package magit
    :pin melpa

    :custom
    (magit-diff-refine-hunk 'all)       ; Show word-granularity differences.

    :config
    (defun my/split-vertically ()
      "Split buffers vertically if focused window is dedicated to a
purpose or not wide enough."
      (when (or (purpose-window-purpose-dedicated-p)
                (< (window-total-width) 160))
        (setq-local split-height-threshold 40)
        ))

    :bind
    ("C-x g"   . magit-status)
    ("C-x M-g" . magit-dispatch)

    :hook
    (after-save . magit-after-save-refresh-status)
    ;; (magit-pre-display-buffer . my/split-vertically)
    ;; (git-commit-setup . my/split-vertically)
    )

  ;; Use libgit rather than git.
  (use-package magit-libgit
    :pin melpa
    )

  ;; Show TODOs in magit-status.
  (use-package magit-todos
    :after magit

    :config
    ;; Mark variables as safe. This prevents prompts when using .dir-locals.el.
    (put 'magit-todos-depth 'safe-local-variable #'integerp)

    :hook
    (magit-mode . magit-todos-mode)
    )

  ;; Work with Git forges from Magit.
  (use-package forge
    :pin melpa                       ; <https://github.com/magit/forge/issues/8>

    :after magit

    :config
    (add-to-list 'forge-alist '("schlomp.space" "schlomp.space/api/v1"
                                "schlomp.space" forge-gitea-repository))
    )
  ) ; unless slow-computer.

(unless slow-computer
  ;; Client for Language Server Protocol servers.
  (use-package lsp-mode
    :if (executable-find "clangd")
    :after (whitespace)

    :custom
    (lsp-prefer-flymake nil)            ; Disable flymake.
    (lsp-auto-guess-root t)             ; Don't ask for project root.
    (lsp-clients-clangd-args '("-compile-commands-dir=build"))
    (lsp-eldoc-render-all t)            ; Display all eldoc information.

    :config
    (defun my/lsp-ws-toggle ()
      (if lsp-ui-peek-mode
          (my/whitespace-mode-off)
        (my/whitespace-mode-on)))

    :hook
    (c++-mode . lsp)
    (c-mode . lsp)
    (lsp-ui-peek-mode . my/lsp-ws-toggle) ; Dots in wrong color.
    )

  ;; Eye-candy and flycheck support for lsp-mode.
  (use-package lsp-ui
    :after (lsp-mode flycheck)

    :custom
    (lsp-ui-sideline-enable nil)        ; Do not insert doc into buffer.
    (lsp-ui-doc-include-signature t)    ; Include signature in doc popup.
    (lsp-ui-doc-enable nil)             ; Disable doc popup.

    :bind
    (:map lsp-ui-mode-map
          ("M-." . lsp-ui-peek-find-definitions)
          ("C-M-." . lsp-ui-peek-find-references)
          ("C-M-," . lsp-ui-peek-find-implementation)
          )

    :hook
    (lsp-mode . lsp-ui-mode)
    )

  ;; Completions with lsp-mode.
  (use-package company-lsp
    :after (lsp-mode company)

    :config
    (push 'company-lsp company-backends)
    )

  ;; ivy interface to lsp-mode.
  (use-package lsp-ivy
    :after (lsp-mode ivy)
    )

  ;; Integration between lsp-mode and treemacs.
  (use-package lsp-treemacs
    :after (treemacs lsp-ui)

    :bind
    (:map lsp-ui-mode-map
          ("<f7>" . lsp-treemacs-errors-list) ; Use treemacs for error list.
          ("M-i" . lsp-treemacs-symbols)      ; Display symbols using treemacs.
          )
    )
  ) ; unless slow-computer.

(provide 'programming/common)
;;; common.el ends here