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+;;; +emacs.el --- measured defaults for Emacs -*- lexical-binding: t -*-
+
+;;; Commentary:
+
+;; I find myself copy-pasting a lot of "boilerplate" type code when
+;; bankrupting my Emacs config and starting afresh.  Instead of doing
+;; that, I'm putting it here, where it'll be easier to include in my
+;; config.
+
+;; Of course, some might say I could just ... stop bankrupting my
+;; Emacs.  But like, why would I want to?
+
+;; Other notable packages include
+;; - https://git.sr.ht/~technomancy/better-defaults/
+;; - https://github.com/susam/emfy
+
+;;; Code:
+
+(require 'early-init (locate-user-emacs-file "early-init.el"))
+
+(defun +set-major-mode-from-buffer-name (&optional buf)
+  "Set the major mode for BUF from the buffer's name.
+Do this only if the buffer is not visiting a file."
+  (unless buffer-file-name
+    (let ((buffer-file-name (buffer-name buf)))
+      (set-auto-mode))))
+
+
+;;; General settings
+
+(setq-default
+ apropos-do-all t
+ async-shell-command-buffer 'new-buffer
+ async-shell-command-display-buffer nil
+ auto-hscroll-mode 'current-line
+ auto-revert-verbose t
+ auto-save-default nil
+ auto-save-file-name-transforms `((".*" ,(.etc "auto-save/") ,(car (secure-hash-algorithms)))
+                                  (".*" ,(.etc "auto-save/") t))
+ auto-save-interval 30
+ auto-save-list-file-prefix (.etc "auto-save/.saves-" t)
+ auto-save-timeout 30
+ auto-save-visited-interval 5
+ auto-window-vscroll nil
+ backup-by-copying t
+ backup-directory-alist `((".*" . ,(.etc "backup/" t)))
+ blink-cursor-blinks 1
+ comp-deferred-compilation nil
+ completion-category-defaults nil
+ completion-category-overrides '((file (styles . (partial-completion))))
+ completion-ignore-case t
+ completion-styles '(substring partial-completion)
+ create-lockfiles nil
+ cursor-in-non-selected-windows 'hollow
+ cursor-type 'bar
+ custom-file (.etc "custom.el")
+ delete-old-versions t
+ echo-keystrokes 0.1
+ ediff-window-setup-function 'ediff-setup-windows-plain
+ eldoc-echo-area-use-multiline-p nil
+ eldoc-idle-delay 0.1
+ enable-recursive-minibuffers t
+ executable-prefix-env t
+ fast-but-imprecise-scrolling t
+ file-name-shadow-properties '(invisible t intangible t)
+ fill-column 80
+ find-file-visit-truename t
+ frame-resize-pixelwise t
+ global-auto-revert-non-file-buffers t
+ global-mark-ring-max 100
+ hscroll-margin 1
+ hscroll-step 1
+ imenu-auto-rescan t
+ image-use-external-converter (or (executable-find "convert")
+                                  (executable-find "gm")
+                                  (executable-find "ffmpeg"))
+ indent-tabs-mode nil
+ inhibit-startup-screen t
+ initial-buffer-choice t
+ kept-new-versions 6
+ kept-old-versions 2
+ kill-do-not-save-duplicates t
+ kill-read-only-ok t
+ kill-ring-max 500
+ kmacro-ring-max 20
+ load-prefer-newer noninteractive
+ major-mode '+set-major-mode-from-buffer-name
+ mark-ring-max 50
+ minibuffer-eldef-shorten-default t
+ minibuffer-prompt-properties (list 'read-only t
+                                    'cursor-intangible t
+                                    'face 'minibuffer-prompt)
+ mode-require-final-newline 'visit-save
+ mouse-drag-copy-region t
+ mouse-wheel-progressive-speed nil
+ mouse-yank-at-point t
+ native-comp-async-report-warnings-errors 'silent
+ native-comp-deferred-compilation nil
+ read-answer-short t
+ read-buffer-completion-ignore-case t
+ ;; read-extended-command-predicate
+ ;; (when (fboundp
+ ;;                                        'command-completion-default-include-p)
+ ;;                                   'command-completion-default-include-p)
+ read-process-output-max 1048576 ; We’re in the future man. Set that to at least a megabyte
+ recenter-positions '(top middle bottom)
+ regexp-search-ring-max 100
+ regexp-search-ring-max 200
+ save-interprogram-paste-before-kill t
+ save-some-buffers-default-predicate #'+save-some-buffers-p
+ scroll-conservatively 101
+ scroll-down-aggressively 0.01
+ scroll-margin 2
+ scroll-preserve-screen-position 1
+ scroll-step 1
+ scroll-up-aggressively 0.01
+ search-ring-max 200
+ search-ring-max 200
+ sentence-end-double-space t
+ set-mark-command-repeat-pop t
+ show-paren-delay 0
+ show-paren-style 'parenthesis
+ show-paren-when-point-in-periphery t
+ show-paren-when-point-inside-paren t
+ ;;show-trailing-whitespace t
+ tab-bar-show 1
+ tab-width 8                    ; so alignment expecting the default looks right
+ tramp-backup-directory-alist backup-directory-alist
+ undo-limit 100000000                   ; 10 MB
+ use-dialog-box nil
+ use-file-dialog nil
+ use-short-answers t
+ vc-follow-symlinks t
+ vc-make-backup-files t
+ version-control t
+ view-read-only t
+ visible-bell nil
+ window-resize-pixelwise t
+ x-select-enable-clipboard t
+ x-select-enable-primary t
+ yank-pop-change-selection t
+ )
+
+;; Programming language offsets.
+;; Set these after the initial block so I can use `tab-width'
+(setq-default
+ c-basic-offset tab-width)
+
+;; Emacs 28 ships with an option, `use-short-answers', that makes this form
+;; obsolete, but I still use 27 at work.
+(when (version< emacs-version "28")
+  (fset 'yes-or-no-p 'y-or-n-p))
+
+
+;;; Encodings
+
+;; Allegedly, this is the only one you need...
+(set-language-environment "UTF-8")
+;; But I still set all of these, for fun.
+(setq-default locale-coding-system 'utf-8-unix
+              coding-system-for-read 'utf-8-unix
+              coding-system-for-write 'utf-8-unix
+              buffer-file-coding-system 'utf-8-unix
+              default-process-coding-system '(utf-8-unix . utf-8-unix)
+              x-select-request-type '(UTF8_STRING
+                                      COMPOUND_TEXT
+                                      TEXT
+                                      STRING))
+
+(set-charset-priority 'unicode)
+(prefer-coding-system 'utf-8-unix)
+(set-default-coding-systems 'utf-8-unix)
+(set-terminal-coding-system 'utf-8-unix)
+(set-keyboard-coding-system 'utf-8-unix)
+
+(pcase system-type
+  ((or 'ms-dos 'windows-nt)
+   (set-clipboard-coding-system 'utf-16-le)
+   (set-selection-coding-system 'utf-16-le))
+  (_
+   (set-selection-coding-system 'utf-8)
+   (set-clipboard-coding-system 'utf-8)))
+
+
+;;; Modes
+
+(dolist (enable-mode '(global-auto-revert-mode
+                       blink-cursor-mode
+                       electric-pair-mode
+                       show-paren-mode
+                       global-so-long-mode
+                       minibuffer-depth-indicate-mode
+                       file-name-shadow-mode
+                       minibuffer-electric-default-mode
+                       delete-selection-mode
+                       auto-save-visited-mode
+                       ;; column-number-mode
+                       ))
+  (when (fboundp enable-mode)
+    (funcall enable-mode +1)))
+
+(dolist (disable-mode '(tooltip-mode
+                        tool-bar-mode
+                        menu-bar-mode
+                        scroll-bar-mode
+                        horizontal-scroll-bar-mode))
+  (when (fboundp disable-mode)
+    (funcall disable-mode -1)))
+
+
+;;; Hooks
+
+(defun +auto-create-missing-dirs ()
+  "Automatically create missing directories when finding a file."
+  ;; https://emacsredux.com/blog/2022/06/12/auto-create-missing-directories/
+  (let ((target-dir (file-name-directory buffer-file-name)))
+    (unless (file-exists-p target-dir)
+      (make-directory target-dir t))))
+
+(defvar +save-some-buffers-debounce-time nil
+  "Last time `+save-some-buffers-debounce' was run.")
+
+(defcustom +save-some-buffers-debounce-timeout 5
+  "Number of seconds to wait before saving buffers again.")
+
+(defun +save-some-buffers-debounce (&rest _)
+  "Run `save-some-buffers', but only if it's been a while."
+  (unless (and +save-some-buffers-debounce-time
+               (< (- (time-convert nil 'integer) +save-some-buffers-debounce-time)
+                  +save-some-buffers-debounce-timeout))
+    (save-some-buffers t)
+    (setq +save-some-buffers-debounce-time (time-convert nil 'integer))))
+
+
+;;; Better-default functions ...
+
+(defun +cycle-spacing (&optional n preserve-nl-back mode)
+  "Negate N argument on `cycle-spacing'.
+That is, with a positive N, deletes newlines as well, leaving -N
+spaces.  If N is negative, it will not delete newlines and leave
+N spaces.  See docstring of `cycle-spacing' for the meaning of
+PRESERVE-NL-BACK and MODE."
+  (interactive "*p")
+  (cycle-spacing (- n) preserve-nl-back mode))
+
+(defun +save-buffers-quit (&optional arg)
+  "Silently save each buffer, then kill the current connection.
+If the current frame has no client, kill Emacs itself using
+`save-buffers-kill-emacs' after confirming with the user.
+
+With prefix ARG, silently save all file-visiting buffers, then
+kill without asking."
+  (interactive "P")
+  (save-some-buffers t)
+  (if (and (not (frame-parameter nil 'client))
+           (and (not arg)))
+      (when (yes-or-no-p "Sure you want to quit? ")
+        (save-buffers-kill-emacs))
+    (delete-frame nil :force)))
+
+(defun +kill-word-backward-or-region (&optional arg backward-kill-word-fn)
+  "Kill active region or ARG words backward.
+BACKWARD-KILL-WORD-FN is the function to call to kill a word
+backward.  It defaults to `backward-kill-word'."
+  (interactive "P")
+  (call-interactively (if (region-active-p)
+                          #'kill-region
+                        (or backward-kill-word-fn #'backward-kill-word))))
+
+(defun +backward-kill-word-wrapper (fn &optional arg)
+  "Kill backward using FN until the beginning of a word, smartly.
+If point is on at the beginning of a line, kill the previous new
+line.  If the only thing before point on the current line is
+whitespace, kill that whitespace.
+
+With argument ARG: if ARG is a number, just call FN
+ARG times.  Otherwise, just call FN."
+  ;; I want this to be a wrapper so that I can call other word-killing functions
+  ;; with it.  It's *NOT* advice because those functions probably use
+  ;; `backward-kill-word' under the hood (looking at you, paredit), so advice
+  ;; will make things weird.
+  (if (null arg)
+      (cond
+       ((looking-back "^" 1)
+        (let ((delete-active-region nil))
+          (delete-backward-char 1)))
+       ((looking-back "^[  ]*")
+        (delete-horizontal-space :backward-only))
+       (t (call-interactively fn)))
+    (funcall fn (if (listp arg) 1 arg))))
+
+(defun +backward-kill-word (&optional arg)
+  "Kill word backward using `backward-kill-word'.
+ARG is passed to `backward-kill-word'."
+  (interactive "P")
+  (+backward-kill-word-wrapper #'backward-kill-word arg))
+
+;;; ... and advice
+
+;; Indent the region after a yank.
+(defun +yank@indent (&rest _)
+  "Indent the current region."
+  (indent-region (min (point) (mark)) (max (point) (mark))))
+(advice-add #'yank :after #'+yank@indent)
+(advice-add #'yank-pop :after #'+yank@indent)
+
+
+;;; Extra functions
+
+(defun +save-some-buffers-p ()
+  "Predicate for `save-some-buffers-default-predicate'.
+It returns nil with remote files and those without attached files."
+  (and (buffer-file-name)
+       (not (file-remote-p (buffer-file-name)))))
+
+;; https://www.wwwtech.de/articles/2013/may/emacs:-jump-to-matching-paren-beginning-of-block
+(defun +goto-matching-paren (&optional arg)
+  "Go to the matching paren, similar to vi's %."
+  (interactive "p")
+  (or arg (setq arg 1))
+  (cond
+   ;; Check for "outside of bracket" positions
+   ((looking-at "[\[\(\{]") (forward-sexp arg))
+   ((looking-back "[\]\)\}]" 1) (backward-sexp arg))
+   ;; Otherwise, move from inside the bracket
+   ((looking-at "[\]\)\}]") (forward-char) (backward-sexp arg))
+   ((looking-back "[\[\(\{]" 1) (backward-char) (forward-sexp arg))
+   (t (up-list arg t t))))
+
+(defun +delete-window-or-bury-buffer ()
+  "Delete the current window, or bury the current buffer.
+If the current window is the only window, bury the buffer."
+  (interactive)
+  (condition-case e
+      (delete-window)
+    (t (bury-buffer))))
+
+
+;;; Required libraries
+
+(when (require 'uniquify nil :noerror)
+  (setq-default uniquify-buffer-name-style 'forward
+                uniquify-separator path-separator
+                uniquify-after-kill-buffer-p t
+                uniquify-ignore-buffers-re "^\\*"))
+
+(when (require 'goto-addr)
+  (if (fboundp 'global-goto-address-mode)
+      (global-goto-address-mode +1)
+    (add-hook 'after-change-major-mode-hook 'goto-address-mode)))
+
+(when (require 'recentf nil :noerror)
+  (setq-default recentf-save-file (.etc "recentf.el")
+                recentf-max-menu-items 100
+                recentf-max-saved-items nil
+                recentf-auto-cleanup 'mode)
+  (add-to-list 'recentf-exclude .etc)
+  (recentf-mode +1))
+
+(when (require 'savehist nil :noerror)
+  (setq-default history-length t
+                history-delete-duplicates t
+                history-autosave-interval 60
+                savehist-file (.etc "savehist.el")
+                ;; Other variables --- don't truncate any of these.
+                ;; `add-to-history' uses the values of these variables unless
+                ;; they're nil, in which case it falls back to `history-length'.
+                kill-ring-max 100
+                mark-ring-max 100
+                global-mark-ring-max 100
+                regexp-search-ring-max 100
+                search-ring-max 100
+                kmacro-ring-max 100
+                eww-history-limit 100)
+  (dolist (var '(extended-command-history
+                 global-mark-ring
+                 mark-ring
+                 kill-ring
+                 kmacro-ring
+                 regexp-search-ring
+                 search-ring))
+    (add-to-list 'savehist-additional-variables var))
+  (savehist-mode +1))
+
+(when (require 'saveplace nil :noerror)
+  (setq-default save-place-file (.etc "places.el")
+                save-place-forget-unreadable-files (eq system-type 'gnu/linux))
+  (save-place-mode +1))
+
+;; (when (require 'tramp)
+;;   ;; thanks Irreal! https://irreal.org/blog/?p=895
+;;   (add-to-list 'tramp-default-proxies-alist
+;;                '(nil "\\`root\\'" "/ssh:%h:"))
+;;   (add-to-list 'tramp-default-proxies-alist
+;;                '((regexp-quote (system-name)) nil nil)))
+
+
+;;; Newer features
+;; These aren't in older version of Emacs, but they're so nice.
+
+(when (fboundp 'repeat-mode)
+  (setq-default repeat-exit-key "g"
+                repeat-exit-timeout 5)
+  (repeat-mode +1))
+
+(when (fboundp 'pixel-scroll-precision-mode)
+  (pixel-scroll-precision-mode +1))
+
+(provide '+emacs)
+;;; +emacs.el ends here