emacs_config/settings.org

* Editing
** Imenu
#+BEGIN_SRC emacs-lisp
  (use-package imenu
    :bind
    ("C-S-s" . imenu))
#+END_SRC
** IEdit mode
#+BEGIN_SRC emacs-lisp
  (use-package iedit
    :bind ("C-;" . iedit-mode))
#+END_SRC
** Spellcheck
#+BEGIN_SRC emacs-lisp
  (global-set-key (kbd "C-!") 'ispell-buffer)
#+END_SRC
** Undo tree
#+BEGIN_SRC emacs-lisp
  (use-package undo-tree
    :config
    (global-undo-tree-mode))
#+END_SRC
* Added functionality
** Multiline sexp with symbol
Jump to symbol, go up list, lispy-multiline. Great for diff-friendly custom
#+BEGIN_SRC emacs-lisp
  (require 'isearch)
  (require 'lispy)
  (defun rlbr/multiline-sexp-with-symbol (symbol-name)
    (save-excursion
      (beginning-of-buffer)
      (search-forward-regexp (isearch-symbol-regexp symbol-name))
      (backward-up-list)
      (lispy-alt-multiline)))
#+END_SRC
** Output matches
Run command for each matching exe and see if output-p is true when fed the command output
#+BEGIN_SRC emacs-lisp
  (defun rlbr/output-matches (output-matches-p exe args)
    "locate the executable whose output satisfies output-matches-p when fed args and return the full-path"
    (let ((exec-path exec-path)
	  (output)
	  (bad)
	  (command-output)
	  (current-exe)
	  (failed))
      (while (not (or output failed))
	(setq current-exe
	      (executable-find exe))
	(if current-exe
	    (progn
	      (setq command-output
		    (shell-command-to-string (format "%s %s" (rlbr/quote-exe current-exe)
						     args)))
	      (if (funcall output-matches-p command-output)
		  (setq output current-exe)
		(progn
		  (setq bad
			(replace-regexp-in-string "/$" "" (file-name-directory current-exe)))
		  (setq exec-path
			(seq-filter (lambda (item)
				      (not (rlbr/case-insensitive-match item bad)))
				    exec-path)))))
	  (setq failed t)))
      output))
#+END_SRC
** Save buffer-output to file
This handy function is a customized ripoff of custom-save-all
#+BEGIN_SRC emacs-lisp
  (defun rlbr/save-buffer-func-to-file (visit-file func args)
    "Rip off of custom-save-all"
    (let* ((filename visit-file)
	   (recentf-exclude (if recentf-mode (append `(,(concat "\\`" (regexp-quote (recentf-expand-file-name visit-file))
								"\\'")
						       ,(concat "\\`" (regexp-quote (file-truename (recentf-expand-file-name visit-file)))
								"\\'"))
						     recentf-exclude)))
	   (old-buffer (find-buffer-visiting filename))
	   old-buffer-name)
      (with-current-buffer (let ((find-file-visit-truename t))
			     (or old-buffer (let ((delay-mode-hooks t))
					      (find-file-noselect filename))))
	(when old-buffer (setq old-buffer-name (buffer-file-name))
	      (set-visited-file-name (file-chase-links filename)))
	(unless (eq major-mode 'emacs-lisp-mode)
	  (delay-mode-hooks (emacs-lisp-mode)))
	(let ((inhibit-read-only t)
	      (print-length nil)
	      (print-level nil))
	  (apply func args))
	(let ((file-precious-flag t))
	  (save-buffer))
	(if old-buffer (progn (set-visited-file-name old-buffer-name)
			      (set-buffer-modified-p nil))
	  (kill-buffer (current-buffer))))))
#+END_SRC
** Low memeory check
#+BEGIN_SRC emacs-lisp
  (defun rlbr/high-mem (&optional threshold)
    (let ((threshold (or threshold (expt 1024 2)))))
    (>= (nth 1 (memory-info))
	threshold))
#+END_SRC
** Kill this buffer
#+BEGIN_SRC emacs-lisp
  (defun rlbr/kill-this-buffer ()
    (interactive)
    (kill-buffer (current-buffer)))
#+END_SRC
* Save/load
** Backup/auto-save
#+BEGIN_SRC emacs-lisp
  (let ((backup-dir "~/.emacs.d/backup")
	(auto-save-dir "~/.emacs.d/autosave"))
    (if (not (file-directory-p backup-dir))
	(make-directory backup-dir))
    (if (not (file-directory-p
	      auto-save-dir))
	(make-directory auto-save-dir)))
#+END_SRC
** On save
#+BEGIN_SRC emacs-lisp
  (add-hook 'before-save-hook 'delete-trailing-whitespace)
#+END_SRC
** Recent files mode
#+BEGIN_SRC emacs-lisp
  (use-package recentf
    :config
    (recentf-mode 1))
#+END_SRC
* Platform dependent
** Windows
#+BEGIN_SRC emacs-lisp
  (when (string-equal system-type "windows-nt")
    (progn (defun rlbr/quote-exe (path)
	     (w32-short-file-name path))
	   (defun rlbr/high-mem () t)
	   (defun rlbr/start-external-shell ()
	     (interactive)
	     (start-process-shell-command (format "cmd(%s)" default-directory)
					  nil "start default.bat"))
	   (global-set-key (kbd "C-S-C")
			   'rlbr/start-external-shell)
	   (defun rlbr/start-windows-explorer-here ()
	     (interactive)
	     (start-process-shell-command "explorer" nil (format "explorer %s" (replace-regexp-in-string "/" (regexp-quote "\\")
													 (expand-file-name default-directory)))))
	   (global-set-key (kbd "C-S-E")
			   'rlbr/start-windows-explorer-here)
	   (defun rlbr/case-insensitive-match (string1 string2)
	     (apply 'string-equal (mapcar 'downcase (list string1 string2))))
	   (let ((find)
		 (grep)
		 (ls))
	     (progn (setq find (rlbr/output-matches (lambda (output)
						      (string-equal ".\n" output))
						    "find" "-maxdepth 0"))
		    (if find (setq find-program (rlbr/quote-exe find)))
		    (setq grep (rlbr/output-matches (lambda (output)
						      (string-match "grep (\\w+ grep)" output))
						    "grep" "-V"))
		    (if grep (setq grep-program (rlbr/quote-exe grep)))
		    (setq ls (rlbr/output-matches (lambda (output)
						    (string-match "ls: .*'\\?/': No such file or directory" output))
						  "ls" "?/"))
		    (if ls (setq insert-directory-program (rlbr/quote-exe ls)))))))
#+END_SRC
* Tramp configuration
** Tramp append plist to connection properties
#+BEGIN_SRC emacs-lisp
  (use-package kv
    :config
    (defun rlbr/add-config-to-tramp (matches-regexp config-plist)
      (let ((config-alist (kvplist->alist config-plist)))
	(dolist (pair config-alist)
	  (let ((config (list matches-regexp (car pair)
			      (cdr pair))))
	    (add-to-list 'tramp-connection-properties config))))))
#+END_SRC
** Android
#+BEGIN_SRC emacs-lisp
  (use-package tramp
    :config
    (let ((android-config (let ((default-directory "/data/data/com.termux/files"))
					     (list "tmpdir" (expand-file-name "home/temp/")
						   "remote-shell" (expand-file-name "usr/bin/sh")
						   "remote-process-environment" (append (list (concat "PREFIX=" default-directory "usr")) tramp-remote-process-environment)
						   "remote-path" (append (mapcar 'expand-file-name '("home/.local/bin" "usr/bin" "usr/bin/applets")) '("/sbin" "/vendor/bin" "/system/sbin" "/system/bin" "/system/xbin"))))))
		       (rlbr/add-config-to-tramp (rx "/" (or "scp" "ssh") (zero-or-one "x") ":" "termux" (zero-or-more any) ":") android-config)))
#+END_SRC
* Major modes
** C
#+BEGIN_SRC emacs-lisp
  (use-package format-all
    :if (executable-find "clang-format")
    :hook (c-mode . format-all-mode))
#+END_SRC
** Java
*** Meghanada
#+BEGIN_SRC emacs-lisp
  (use-package autodisass-java-bytecode
    :defer t)

  (use-package meghanada
    :if (rlbr/high-mem (* 512 1024))
    :defer t
    :init
    (add-hook 'java-mode-hook
	      (lambda ()
		(meghanada-mode t)
		(flycheck-mode +1)
		(add-hook 'before-save-hook 'meghanada-code-beautify-before-save)))

    :config
    (setq indent-tabs-mode nil)
    (setq meghanada-server-remote-debug t)
    (setq meghanada-javac-xlint "-Xlint:all,-processing")
    (advice-add 'meghanada-code-beautify :around (lambda (old)
						   (interactive)
						   (let ((p (line-number-at-pos)))
						     (apply old nil)
						     (goto-line p)
						     (reposition-window))))
    (defhydra hydra-meghanada (:hint nil :exit t)
      "
  ^Edit^                           ^Tast or Task^
  ^^^^^^-------------------------------------------------------
 _f_: meghanada-compile-file _m_: meghanada-restart
 _c_: meghanada-compile-project _t_: meghanada-run-task
 _o_: meghanada-optimize-import _j_: meghanada-run-junit-test-case
 _s_: meghanada-switch-test-case _J_: meghanada-run-junit-class
 _v_: meghanada-local-variable _R_: meghanada-run-junit-recent
 _i_: meghanada-import-all _r_: meghanada-reference
 _g_: magit-status _T_: meghanada-typeinfo
 _q_: exit
  "
      ("f" meghanada-compile-file)
      ("m" meghanada-restart)

      ("c" meghanada-compile-project)
      ("o" meghanada-optimize-import)
      ("s" meghanada-switch-test-case)
      ("v" meghanada-local-variable)
      ("i" meghanada-import-all)

      ("g" magit-status)

      ("t" meghanada-run-task)
      ("T" meghanada-typeinfo)
      ("j" meghanada-run-junit-test-case)
      ("J" meghanada-run-junit-class)
      ("R" meghanada-run-junit-recent)
      ("r" meghanada-reference)

      ("q" exit)
      ("z" nil "leave"))
    :bind
    (:map meghanada-mode-map
	  ("C-S-t" . meghanada-switch-testcase)
	  ("M-RET" . meghanada-local-variable)
	  ("M-r" . meghanada-reference)
	  ("M-t" . meghanada-typeinfo)
	  ("C-z" . hydra-meghanada/body))
    :commands
    (meghanada-mode))
#+END_SRC
** JavaScript
#+BEGIN_SRC emacs-lisp
  (use-package js2-mode
    :mode "\\.js\\'"
    :hook ((js2-mode . js2-imenu-extras-mode)
	   (js2-mode . (lambda () (add-hook 'xref-backend-functions #'xref-js2-xref-backend nil t))))
    :config
    (use-package js2-refactor
      :hook (js2-mode . js2-refactor-mode)
      :bind
      (:map js2-mode-map
	    ("C-k" . js2r-kill))
      :config
      (js2r-add-keybindings-with-prefix "C-c C-r"))
    (use-package xref-js2
      :demand t)
    (define-key js-mode-map (kbd "M-.") nil)
    (defun rlbr/jump-to-definition ()
      "Jump to a definition."
      (interactive)
      (condition-case-unless-debug nil
	  (js2-jump-to-definition)
	(error
	 (progn
	   (ignore-errors
	     (xref-pop-marker-stack))
	   (xref-find-definitions (xref-backend-identifier-at-point (xref-find-backend)))))))
    (define-key js-mode-map (kbd "M-.") #'rlbr/jump-to-definition))
#+END_SRC
** Lisp
*** Emacs lisp
#+BEGIN_SRC emacs-lisp
  (use-package elisp-mode
    :hook (emacs-lisp-mode . company-mode))
#+END_SRC
** Magit
#+BEGIN_SRC emacs-lisp
  (use-package magit
    :bind (("C-x g" . magit-status))
    :config
    (use-package git-commit
      :hook (git-commit-setup . git-commit-turn-on-flyspell)))
#+END_SRC
** Python
*** Platform specific
Set python command
#+BEGIN_SRC emacs-lisp
  (setq elpy-rpc-python-command
	(cond
	 ((string-equal system-type "gnu/linux")
	  "python3")
	 ((string-equal system-type "windows-nt")
	  "pythonw.exe")))
#+END_SRC
put executables in elpy-rpc-venv in path
#+BEGIN_SRC emacs-lisp
  (defun rlbr/elpy-append-to-path ()
    (setenv "PATH" (string-join (list (getenv "PATH")
				      (let ((default-directory (elpy-rpc-get-or-create-virtualenv))
					    (path-entry)
					    (elpy-binpath))
					(if (string-equal system-type "windows-nt")
					    (progn (setq elpy-binpath (expand-file-name "Scripts"))
						   (setq path-entry (replace-regexp-in-string (regexp-quote "/")
											      (regexp-quote "\\")
											      elpy-binpath)))
					  (setq elpy-binpath (expand-file-name "bin"))
					  (setq path-entry elpy-binpath))
					(nconc exec-path (list elpy-binpath))
					elpy-binpath))
				path-separator)))
#+END_SRC
#+BEGIN_SRC emacs-lisp
  (defun rlbr/fix-for-android ()
    (unless (= 0 (call-process elpy-rpc-python-command nil nil nil "-c" "import multiprocessing;multiprocessing.Pool()"))
      (setq python-check-command
	    (string-join `(,python-check-command "--jobs=1") " "))))
#+END_SRC
*** Custom feature
#+BEGIN_SRC emacs-lisp
  (defun rlbr/join-venv-with-number (number-name)
    "Join a list with a name and a number"
    (let
	((number (car number-name))
	 (name (cdr number-name)))
      (if (= number 0)
	  name
	(string-join (list name (number-to-string number))
		     "~"))))

  (defun rlbr/split-venv-with-number (name-number)
    "Split a virtualenv name with either a ~ seperating the name and the number, or nothing"
    (let ((split-result (split-string name-number (regexp-quote "~")))
	  (ret))
      (if (= 1 (length split-result))
	  (progn
	    (setq ret (car split-result))
	    (push 0 ret))
	(progn
	  (setq ret
		(string-join
		 (butlast split-result)
		 "~"))
	  (push
	   (string-to-number
	    (car (last split-result)))
	   ret)))
      ret))

  (defun rlbr/get-venv-name (&optional library-root)
    "Generate venv name based off of the base-name of the library root"
    (file-name-base
     (directory-file-name
      (if library-root
	  library-root
	(elpy-library-root)))))

  (defun rlbr/handle-name-conflicts (venv-name)
    "Deal with potential name conflicts in venv"
    (let ((venv-conflicts)
	  (venv-partition-name))
      (setq venv-partition-name (rlbr/split-venv-with-number venv-name))
      (setq venv-conflicts
	    (seq-filter
	     (lambda (item)
	       (string-equal (cdr item)
			     venv-name))
	     (mapcar #'rlbr/split-venv-with-number (pyvenv-virtualenv-list))))
      (when venv-conflicts
	(setcar venv-partition-name (1+ (apply 'max (mapcar #'car venv-conflicts)))))
      (rlbr/join-venv-with-number venv-partition-name)))

  (require 'vc)
  (defun rlbr/setup-python-venv-dirlocals (&optional library-root venv-name)
    "Setup .dir-locals file in library root and tell vc system to ignore .dir-locals file"
    (let* ((library-root (if library-root
			     library-root
			   (elpy-library-root)))
	   (venv-name (if venv-name venv-name (rlbr/get-venv-name library-root)))
	   (default-directory library-root)
	   (dir-locals-path (expand-file-name
			     ".dir-locals.el")))
      (rlbr/save-buffer-func-to-file dir-locals-path 'add-dir-local-variable
				     `(python-mode pyvenv-workon ,venv-name))
      (let* ((vc-root (vc-find-root dir-locals-path ".git"))
	     (vc-ignore-file (vc-call-backend 'Git 'find-ignore-file vc-root)))
	(if (apply 'string-equal (mapcar 'directory-file-name (mapcar 'file-truename (list vc-root library-root))))
	    (progn
	      (unless (file-exists-p vc-ignore-file)
		(with-temp-buffer
		  (write-file vc-ignore-file)))
	      (vc-ignore ".dir-locals.el"))
	  (when (y-or-n-p (format "Ignore .dir-locals.el in repo '%s' ?" vc-root))
	    (unless (file-exists-p vc-ignore-file)
	      (with-temp-buffer
		(write-file vc-ignore-file)))
	    (vc-ignore ".dir-locals.el"))))))

  (defun rlbr/get-python-executable ()
    (read-file-name "Python interpreter to use: " (file-name-directory (executable-find "python"))
		    nil nil "python"))

  (defun emacs-default-venv ()
    (unless (member "emacs-default-venv" (pyvenv-virtualenv-list))
      (pyvenv-create "emacs-default-venv" (rlbr/get-python-executable)))
    "emacs-default-venv")

  (defun rlbr/init-python-venv-in-library-root (&optional library-root)
    "Prompt to either create one or use default" (let ((venv-name (rlbr/get-venv-name))
						       (library-root (if library-root library-root (elpy-library-root))))
						   (setq venv-name (rlbr/handle-name-conflicts venv-name))
						   (if (y-or-n-p (format "Create venv '%s'?" venv-name))
						       (pyvenv-create venv-name (rlbr/get-python-executable))
						     (progn
						       (setq venv-name (emacs-default-venv))))
						   (rlbr/setup-python-venv-dirlocals library-root venv-name)
						   venv-name))
  (require 'dash)
  (defun rlbr/init-venv ()
    (when (eq major-mode 'python-mode)
      (cond ((file-remote-p buffer-file-name)
	     ;; If the file is remote, don't try and do anything fancy
	     (setq-local pyvenv-workon (emacs-default-venv)))
	    ((let ((buffer-file-name (file-truename buffer-file-name)))
	       (-any (lambda (file-prefix)
		       (string-prefix-p file-prefix buffer-file-name))
		     (mapcar 'file-truename (list
					     "/usr/lib/python"
					     "~/.pyenv/versions/"
					     (elpy-rpc-get-or-create-virtualenv)
					     (pyvenv-workon-home)))))
	     ;; Don't change anything if entering a file in a python install's lib (ie xref)
	     nil)
	    (t
	     ;; Upon failing all conditions, prompt to create virtual environment if it doesn't exist
	     (cond ((and pyvenv-workon (not (member pyvenv-workon (pyvenv-virtualenv-list))))
		    ;; If there is a virtualenv specified and it doesn't exist, prompt to create it or set to default virtual environment
		    (if (y-or-n-p (format "Venv '%s' is specified but does not exist. Create it?" pyvenv-workon))
			(progn (pyvenv-create pyvenv-workon (rlbr/get-python-executable))
			       (pyvenv-workon pyvenv-workon))
		      (rlbr/save-buffer-func-to-file (let ((default-directory (elpy-library-root)))
						       (expand-file-name ".dir-locals.el"))
						     'add-dir-local-variable '(python-mode pyvenv-workon (emacs-default-venv)))
		      (setq-local pyvenv-workon (emacs-default-venv))))
		   ((not pyvenv-workon)
		    ;; If nothing has already set pyvenv-workon, create venv
		    (setq-local pyvenv-workon (rlbr/init-python-venv-in-library-root))))))
      (pyvenv-workon pyvenv-workon)))
#+END_SRC
*** Bindings/settings
#+BEGIN_SRC emacs-lisp
  (use-package python
    :hook
    ((python-mode . pyvenv-mode)
     (python-mode . flycheck-mode)
     (python-mode . (lambda () (add-hook 'before-save-hook 'elpy-black-fix-code nil 'local))))
    :bind
    (:map python-mode-map
	  (("C-<" . flycheck-previous-error)
	   ("C->" . flycheck-next-error)))
    :config
    (use-package elpy
      :hook (hack-local-variables . rlbr/init-venv)
      :bind (:map python-mode-map
		  (("C-=" . elpy-goto-assignment)))
      :config
      (when (require 'flycheck nil t)
	(setq elpy-modules (delq 'elpy-module-flymake elpy-modules)))
      (rlbr/elpy-append-to-path)
      (rlbr/fix-for-android))
    (use-package realgud
      :bind (:map python-mode-map
		  (("C-c d b" . realgud:pdb))))
    (elpy-enable))
#+END_SRC
** SSH config mode
#+BEGIN_SRC emacs-lisp
  (use-package ssh-config-mode
    :mode "~/.ssh/config\\'")
#+END_SRC
** Tramp
** Webmode
#+BEGIN_SRC emacs-lisp
  (use-package web-mode
    :mode
    (("\\.phtml\\'" . web-mode)
     ("\\.tpl\\.php\\'" . web-mode)
     ("\\.[agj]sp\\'" . web-mode)
     ("\\.as[cp]x\\'" . web-mode)
     ("\\.erb\\'" . web-mode)
     ("\\.mustache\\'" . web-mode)
     ("\\.djhtml\\'" . web-mode)
     ("\\.html?\\'" . web-mode)))
#+END_SRC
** YAML
#+BEGIN_SRC emacs-lisp
  (use-package yaml-mode
    :mode "\\.yml\\'")
#+END_SRC
* Minor modes/misc
** Kill the things
*** Buffer
#+BEGIN_SRC emacs-lisp
(global-set-key (kbd "C-x k") 'rlbr/kill-this-buffer)
#+END_SRC
*** Emacs
#+BEGIN_SRC emacs-lisp
  (global-set-key (kbd "C-x C-k C-x C-k") 'save-buffers-kill-emacs)
#+END_SRC
** Lispy
#+BEGIN_SRC emacs-lisp
  (use-package lispy
    :hook ((emacs-lisp-mode) . lispy-mode))
#+END_SRC
** Custom custom
#+BEGIN_SRC emacs-lisp
  (advice-add 'custom-save-faces :after (lambda () (rlbr/multiline-sexp-with-symbol "custom-set-faces")))
  (advice-add 'custom-save-variables :after (lambda () (rlbr/multiline-sexp-with-symbol "custom-set-variables")))
#+END_SRC
** Elmacro
#+BEGIN_SRC emacs-lisp
  (use-package elmacro
    :demand
    :config
    (elmacro-mode +1))
#+END_SRC
** Better shell
#+BEGIN_SRC emacs-lisp
  (use-package better-shell
    :bind
    (("C-M-;" . better-shell-shell)
     ("C-M-:" . better-shell-remote-open)
     ("C-#" . better-shell-sudo-here)))
#+END_SRC
* Navigation/auto-completion
** Ace window
#+BEGIN_SRC emacs-lisp
  (use-package ace-window
    :bind (("M-Q" . ace-window)))
#+END_SRC
** Hippie expand
#+BEGIN_SRC emacs-lisp
  (use-package hippie-exp
    :bind ("M-/" . hippie-expand))
#+END_SRC
** IBuffer mode
#+BEGIN_SRC emacs-lisp
  (use-package ibbufer-vc
    :hook
    ((ibuffer-mode . ibuffer-vc-set-filter-groups-by-vc-root)))
  ;; Use human readable Size column instead of original one
  (use-package ibuffer :bind (("C-x C-b" . ibuffer))
    :config (define-ibuffer-column size-h (:name "Size" :inline t)
	      (cond ((> (buffer-size)
			1000000)
		     (format "%7.1fM" (/ (buffer-size)
					 1000000.0)))
		    ((> (buffer-size)
			100000)
		     (format "%7.0fk" (/ (buffer-size)
					 1000.0)))
		    ((> (buffer-size)
			1000)
		     (format "%7.1fk" (/ (buffer-size)
					 1000.0)))
		    (t (format "%8d" (buffer-size))))))
#+END_SRC
** Ivy
#+BEGIN_SRC emacs-lisp
  (use-package ivy
    :config
    (use-package swiper
      :bind ("C-s" . swiper))
    (ivy-mode))
#+END_SRC
* Look and feel
** Theme
#+BEGIN_SRC emacs-lisp
  (use-package dracula-theme
    :config
    (load-theme 'dracula t))
#+END_SRC
** Line numbers
#+BEGIN_SRC emacs-lisp
  (global-display-line-numbers-mode)
#+END_SRC
** Mode line bell
#+BEGIN_SRC emacs-lisp
  (use-package mode-line-bell
    :config
    (mode-line-bell-mode))
#+END_SRC
** Spaceline
#+BEGIN_SRC emacs-lisp
  (use-package spaceline-config
    :config (use-package winum
	      :bind
	      (:map winum-keymap
		    (("M-0" . winum-select-window-0-or-10)
		     ("M-1" . winum-select-window-1)
		     ("M-2" . winum-select-window-2)
		     ("M-3" . winum-select-window-3)
		     ("M-4" . winum-select-window-4)
		     ("M-5" . winum-select-window-5)
		     ("M-6" . winum-select-window-6)
		     ("M-7" . winum-select-window-7)
		     ("M-8" . winum-select-window-8))))
    (spaceline-spacemacs-theme)
    (winum-mode))
#+END_SRC