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;;; shell.el -*- lexical-binding: t; -*-
;;;
;;; Author: Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;; URL: https://git.sr.ht/~jakob/.emacs.d/
;;;
;;; After reading Pierre Neidhardt's article on `shell-mode', I've decided to
;;; give it a try over Alacritty. This is a configuration to make it act a
;;; little bit more like `eshell' -- a notion of "visual" programs that need to
;;; be run in a proper terminal emulator, and popping the shell buffer to the
;;; currently-focused window.
;;;
;;; [1]: https://ambrevar.xyz/emacs-eshell-versus-shell/index.html
;;;
(defmacro with-temporary-bindings (bindings &rest form)
"Weak and partially underspecified macro to temporarily set
`bindings', undoing them when `form' has finished evaluating."
`(unwind-protect
(progn ,@(mapcar #'(lambda (form) (cons 'setq form)) bindings)
,@form)
(progn ,@(mapcar #'(lambda (form) `(setq ,(car form) ,(eval (car form)))) bindings))))
;; I dislike the default behavior of creating a new window upon invoking
;; `shell', but there isn't a better way of dealing with that.
(defun shell-same-window (&optional buffer)
"Copy-pasted version of `shell' which does not use `pop-to-buffer'."
(interactive)
(let ((buffer-name "*shell*")
(n 1))
(while (get-buffer buffer-name)
(setq buffer-name (format "*shell-%d*" n))
(setq n (1+ n)))
(setq buffer (switch-to-buffer buffer-name)))
;; Don't play 'dumb', but don't ruin it for other modes that use comint.
;; (make-local-variable 'comint-terminfo-terminal)
;; (setq comint-terminfo-terminal "xterm-256color")
(with-connection-local-variables
;; On remote hosts, the local `shell-file-name' might be useless.
(when (file-remote-p default-directory)
(if (and (called-interactively-p 'any)
(null explicit-shell-file-name)
(null (getenv "ESHELL")))
(set (make-local-variable 'explicit-shell-file-name)
(file-local-name
(expand-file-name
(read-file-name
"Remote shell path: " default-directory shell-file-name
t shell-file-name))))))
;; Rain or shine, BUFFER must be current by now.
(unless (comint-check-proc buffer)
(let* ((prog (or explicit-shell-file-name
(getenv "ESHELL") shell-file-name))
(name (file-name-nondirectory prog))
(startfile (concat "~/.emacs_" name))
(xargs-name (intern-soft (concat "explicit-" name "-args"))))
(unless (file-exists-p startfile)
(setq startfile (concat user-emacs-directory "init_" name ".sh")))
(setq-local shell--start-prog (file-name-nondirectory prog))
(setq comint-terminfo-terminal "xterm-256color")
(with-temporary-bindings ((comint-terminfo-terminal "xterm-256color"))
(apply #'make-comint-in-buffer "shell" buffer prog
(if (file-exists-p startfile) startfile)
(if (and xargs-name (boundp xargs-name))
(symbol-value xargs-name)
'("-i"))))
(shell-mode))))
buffer)
;; Fortunately, there is a better way of doing it for `man' (which we'll see in
;; the configuration later).
(setq Man-notify-method 'pushy)
;; Use ANSI colors in `shell' (and elsewhere!?).
(use-package xterm-color
;; Use the same colors as Alacritty.
:init
(setq xterm-color-names
["#333333" "#F2777A" "#99CC99" "#FFCC66"
"#6699CC" "#CC99CC" "#66CCCC" "#DDDDDD"])
(setq xterm-color-names-bright
["#5D5D5D" "#CF8BA2" "#90D6A6" "#E0BF80"
"#5F7AB1" "#807793" "#1FB6D3" "#F6F6F6"])
:init
(setq comint-output-filter-functions
(remove 'ansi-color-process-output
comint-output-filter-functions))
:init
(defun xterm-title-filter (string)
"Pre-match filter for setting a buffer-local variable
`shell-title' upon reading the ANSI escape sequence for setting
the terminal emulator's window title."
(let ((pattern (rx "\033]0;"
(group-n 1 (one-or-more (not "\007")))
"\007")))
(when (string-match pattern string)
(setq-local shell-title (match-string 1 string))))
string)
:hook
(shell-mode .
(lambda ()
;; Disable font-locking in this buffer to improve performance
(font-lock-mode -1)
;; Prevent font-locking from being re-enabled in this buffer
(make-local-variable 'font-lock-function)
(setq font-lock-function (lambda (_) nil))
(add-hook 'comint-preoutput-filter-functions 'xterm-color-filter nil t)
(add-hook 'comint-preoutput-filter-functions 'xterm-title-filter nil t))))
(defvar visual-commands
'("alsamixer" "r2" "radare2" "top")
"Shell commands to run in a proper terminal emulator.")
(defun shell-fake-comint-send (pmark)
"Make it seem as though the current line was sent to the inferior."
;; First, we make the "input" to comint empty.
(goto-char pmark)
(kill-line)
(comint-send-input) ; and send it.
(save-excursion
;; Then, we copy the input to the previous line,
(forward-line -1)
(end-of-visual-line)
(yank)
;; And finish by cleaning the kill ring.
(pop kill-ring)
(when kill-ring-yank-pointer
(setq kill-ring-yank-pointer kill-ring))))
(defun shell-screen-command ()
"Handle any visual commands before deferring to the inferior."
(interactive)
(let ((proc (get-buffer-process (current-buffer))))
(if (not proc) (user-error "Current buffer has no process")
(let* ((pmark (process-mark proc))
(intxt (if (>= (point) (marker-position pmark))
(progn (if comint-eol-on-send
(if comint-use-prompt-regexp
(end-of-line)
(goto-char (field-end))))
(buffer-substring pmark (point)))
(let ((copy (funcall comint-get-old-input)))
(goto-char pmark)
(insert copy)
copy)))
(input (if (not (eq comint-input-autoexpand 'input))
;; Just whatever's already there.
intxt
;; Expand and leave it visible in buffer.
(comint-replace-by-expanded-history t pmark)
(buffer-substring pmark (point))))
(command (cl-first (split-string input " ")))
(args (cl-rest (split-string input " ")))
(visual (cl-member command visual-commands :test #'string=)))
(cond ((string= command "man") (man (string-join args " "))
(shell-fake-comint-send pmark))
(visual (start-process
"" nil "alacritty"
"--class" (format "*%s*,*%s*" command command)
"-e" "bash" "-c" (format "echo -ne \"\033]0;%s\007\" && %s" input input))
(shell-fake-comint-send pmark))
(t (comint-send-input)))))))
(bind-key "RET" 'shell-screen-command shell-mode-map)
(defun shell-clear ()
"Remove all preceding lines of shell interaction."
(interactive)
(let ((n (* 2 (1- (line-number-at-pos)))))
(goto-char (point-min))
(while (cl-plusp n)
(delete-visual-line)
(setq n (1- n)))
(end-of-line)))
(bind-key "C-c C-l" 'shell-clear shell-mode-map)
(bind-key "C-c C-s" 'comint-history-isearch shell-mode-map)
(bind-key "C-c C-r" 'comint-history-isearch-backward shell-mode-map)
;; Close the buffer upon quitting with C-d.
(defun shell-kill-buffer-on-quit (process event)
"Called when the shell process is stopped.
Kills the buffer when the shell program quits."
(ignore event)
(comint-write-input-ring)
(let ((buf (process-buffer process)))
(when (buffer-live-p buf)
(with-current-buffer buf (kill-buffer)))))
(defun add-shell-sentinel (&rest args)
(ignore args)
(set-process-sentinel (get-buffer-process (current-buffer))
#'shell-kill-buffer-on-quit))
(add-hook 'shell-mode-hook #'add-shell-sentinel)
;; Use proper Bash completion.
(use-package bash-completion
:hook
(shell-mode . (lambda ()
(company-mode)
(setq completion-at-point-functions
(list #'bash-completion-dynamic-complete))
(bind-key "TAB" #'company-complete shell-mode-map)))
;; AWS is sometimes a little slow...
:init
(setq bash-completion-process-timeout 5.0))
(add-to-list 'auto-mode-alist '("\\.ebuild?\\'" . sh-mode))
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