Add jshell stuff
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elisp/inferior-jshell.el
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287
elisp/inferior-jshell.el
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;;; inferior-jshell.el --- Run JShell in a comint buffer -*- lexical-binding: t; -*-
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;;; Commentary:
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;;; Code:
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(require 'comint)
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(require 'cl-lib)
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(require 'cc-mode)
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(require 'treesit)
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(eval-when-compile (require 'rx))
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(defgroup inferior-jshell ()
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"Run JShell in a comint buffer."
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:group 'comint)
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(defvar jshell-buffer-name "*jshell*"
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"Name to use for inferior jshell process buffer.")
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(defvar jshell-program "jshell"
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"The program to default to for `run-jshell'.")
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(defvar jshell-switches ()
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"List of arguments to pass to jshell in `run-jshell'.")
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(defvar-local jshell--fontification-buffer nil
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"The fontification buffer for the current jshell buffer.")
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(defvar-local jshell--skip-next-lines 0
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"Number of lines of output to skip.")
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(defun jshell--preoutput-filter-function (output)
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"Preoutput filter function for jshell.
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OUTPUT is the new text to be inserted."
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(if (<= jshell--skip-next-lines 0)
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output
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(let* ((lines (string-lines output))
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(cnt (length lines)))
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(if (> cnt jshell--skip-next-lines)
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(prog1
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(string-join (nthcdr jshell--skip-next-lines lines) "\n")
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(setq jshell--skip-next-lines 0))
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(cl-decf jshell--skip-next-lines cnt)
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(when (and (not (string-empty-p output))
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(/= ?\n (elt output (1- (length output)))))
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(cl-incf jshell--skip-next-lines))
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""))))
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(defun jshell--get-fontification-buffer ()
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"Return the jshell fontification buffer."
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(if (buffer-live-p jshell--fontification-buffer)
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jshell--fontification-buffer
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(let ((buffer (generate-new-buffer
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(format " %s-fontification-buffer" (buffer-name)))))
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(with-current-buffer buffer
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(unless (derived-mode-p 'c++-mode)
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(let ((delayed-mode-hooks nil))
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(delay-mode-hooks
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(java-mode))))
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(when (eq c-basic-offset 'set-from-style)
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(setq-local c-basic-offset standard-indent))
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(let ((inhibit-message t))
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(indent-tabs-mode -1))
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(unless font-lock-mode
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(font-lock-mode 1)))
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(setq-local jshell--fontification-buffer buffer))))
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(defmacro jshell--with-font-lock-buffer (&rest body)
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"Execute BODY in the jshell indirect buffer.
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Note that this erases the buffer before doing anything."
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`(with-current-buffer (jshell--get-fontification-buffer)
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(erase-buffer)
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,@body))
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(defun jshell--fontify-current-input ()
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"Function called from `post-command-hook' to fontify the current input."
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(when-let ((proc (get-buffer-process (current-buffer)))
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(start (process-mark proc))
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(end (point-max))
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(input (buffer-substring-no-properties start end))
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(fontified (jshell--with-font-lock-buffer
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(insert input)
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(font-lock-ensure)
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(buffer-string)))
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(len (length fontified))
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(i 0))
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;; mostly from:
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;; `python-shell-font-lock-post-command-hook'
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(while (not (= i len))
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(let* ((props (text-properties-at i fontified))
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(change-i (or (next-property-change i fontified)
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len)))
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(when-let ((face (plist-get props 'face)))
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(setf (plist-get props 'face) nil
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(plist-get props 'font-lock-face) face))
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(set-text-properties (+ start i) (+ start change-i) props)
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(setq i change-i)))))
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(defun jshell--bounds-of-last-prompt ()
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"Return the bounds of the last jshell prompt.
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This returns a cons."
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(save-excursion
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(let ((end (process-mark (get-buffer-process (current-buffer)))))
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(goto-char end)
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(cons (pos-bol) end))))
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(defun jshell--remove-extra-indentation (count)
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"Remove COUNT spaces from the start of each line."
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(save-excursion
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(goto-char (point-min))
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(while (not (eobp))
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(back-to-indentation)
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(let ((indent (- (point) (pos-bol))))
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(when (> indent count)
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(delete-char (- count))))
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(forward-line))))
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(defun jshell--indent-line-function ()
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"`indent-line-function' for jshell comint buffers."
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(let* ((start (process-mark (get-buffer-process (current-buffer)))))
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;; don't indent the first line
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(unless (= (pos-bol) (save-excursion (goto-char start) (pos-bol)))
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(let* ((input (buffer-substring-no-properties start (pos-eol)))
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(prompt-size (let ((bound (jshell--bounds-of-last-prompt)))
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(- (cdr bound) (car bound))))
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(col (jshell--with-font-lock-buffer
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(insert input)
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(jshell--remove-extra-indentation prompt-size)
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(c-indent-line nil t)
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(back-to-indentation)
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(- (point) (pos-bol)))))
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(save-excursion
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(indent-line-to (+ prompt-size col)))
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(skip-syntax-forward "-")))))
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(defun jshell-send-input ()
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"Like `comint-send-input', but with some extra stuff for jshell."
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(interactive)
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(let ((pmark (process-mark (get-buffer-process (current-buffer))))
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(end (if comint-eol-on-send (pos-eol) (point))))
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(with-restriction pmark end
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(let ((res (syntax-ppss (point-max))))
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(without-restriction
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(cond
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;; open string
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((cl-fourth res)
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(message "Unterminated string"))
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;; unmatched blocks or comment
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((or (numberp (cl-fifth res))
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(not (zerop (cl-first res)))
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;; trailing . character
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(save-excursion
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(end-of-line)
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(skip-syntax-backward "-")
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(eql (char-before) ?.)))
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(newline-and-indent))
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(t
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;; jshell will echo out each line we send it, ignore all of them
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(setq-local jshell--skip-next-lines (count-lines pmark end))
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(when (= pmark end)
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(cl-incf jshell--skip-next-lines))
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;; also, methods add a bunch of extra newlines
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(when (>= jshell--skip-next-lines 2)
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(cl-incf jshell--skip-next-lines (- jshell--skip-next-lines 2)))
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(comint-send-input))))))))
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(defvar-keymap inferior-jshell-mode-map
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:doc "Keymap for `inferior-jshell-mode'."
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:parent comint-mode-map
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"RET" #'jshell-send-input)
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(defvar inferior-jshell-mode-syntax-table (copy-syntax-table java-mode-syntax-table)
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"Syntax table for `inferior-jshell-mode'.")
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(defun jshell--kill-fontification-buffer ()
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"Kill the current `jshell--fontification-buffer'."
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(kill-buffer jshell--fontification-buffer))
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(define-derived-mode inferior-jshell-mode comint-mode "Inferior Jshell"
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"Major mode for buffers running inferior CERN jshell processes."
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:group 'inferior-jshell
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:syntax-table inferior-jshell-mode-syntax-table
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(setq-local comint-highlight-input nil
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indent-line-function #'jshell--indent-line-function
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electric-indent-chars '(?\n ?}))
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(add-hook 'comint-preoutput-filter-functions
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#'jshell--preoutput-filter-function
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nil t)
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(add-hook 'post-command-hook
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#'jshell--fontify-current-input
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nil t)
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(add-hook 'kill-buffer-hook
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#'jshell--kill-fontification-buffer
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nil t))
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(cl-defun run-jshell (&optional (cmd jshell-program) (switches jshell-switches))
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"Run CERN jshell in a comint buffer.
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CMD is the shell command to run. It defaults to `jshell-program'. SWITCHES are
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the arguments to pass. They default to `jshell-switches'."
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(interactive)
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(pop-to-buffer
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(with-current-buffer (get-buffer-create jshell-buffer-name)
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(prog1 (current-buffer)
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(unless (process-live-p (get-buffer-process (current-buffer)))
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(inferior-jshell-mode)
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(comint-exec (current-buffer) "Inferior Jshell" cmd nil switches))))))
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(cl-defun jshell--find-buffer ()
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"Find and return a live jshell buffer."
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(dolist (buffer (buffer-list))
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(with-current-buffer buffer
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(when (and (derived-mode-p 'inferior-jshell-mode)
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(process-live-p (get-buffer-process buffer)))
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(cl-return-from jshell--find-buffer buffer)))))
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(defun jshell-eval (code)
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"Evaluate CODE in a live JShell buffer."
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(interactive "sEval: ")
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(let ((buffer (jshell--find-buffer)))
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(unless buffer
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(user-error "No live JShell buffer found"))
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(with-current-buffer buffer
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(let* ((start (process-mark (get-buffer-process buffer)))
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(end (point-max))
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(old (buffer-substring-no-properties start end)))
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(delete-region start end)
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(goto-char (point-max))
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(insert code)
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(goto-char (point-max))
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(jshell-send-input)
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(goto-char (point-max))
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(insert old)
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(goto-char (point-max))))))
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(defun jshell-eval-region (start end)
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"Evaluate the current buffer from START to END in a live JShell buffer.
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START and END default to the current region."
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(interactive "r")
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(jshell-eval (buffer-substring-no-properties start end)))
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(defun jshell-eval-buffer ()
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"Send the current buffer to a live JShell buffer."
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(interactive)
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(jshell-eval-region (point-min) (point-max)))
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(defun jshell-eval-defun ()
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"Send the defun under point to a live JShell buffer."
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(interactive)
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(let ((bounds (bounds-of-thing-at-point 'defun)))
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(unless bounds
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(user-error "No defun under point"))
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(jshell-eval-region (car bounds) (cdr bounds))))
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(defun jshell-eval-expression ()
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"Send the Java expression under point to a live JShell buffer.
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This only works in `java-ts-mode'."
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(interactive)
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(let ((root (treesit-buffer-root-node)))
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(let ((node (car (or (treesit-query-range
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root '([(expression_statement)
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(field_declaration)
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(local_variable_declaration)
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(import_declaration)]
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@exp)
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(point) (1+ (point)))
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(treesit-query-range
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root '([(parenthesized_expression)
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(binary_expression)
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(update_expression)
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(unary_expression)]
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@exp)
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(point) (1+ (point)))))))
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(unless node
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(user-error "No expression found under point"))
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(let ((text (buffer-substring-no-properties (car node) (cdr node))))
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(when (string-match (rx (* (syntax whitespace))
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";"
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(* (syntax whitespace)) eos)
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text)
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(setq text (substring text 0 (match-beginning 0))))
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(when (string-match (rx bos (* (syntax whitespace)) "("
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(group (* any))
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")" (* (syntax whitespace)) eos)
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text)
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(setq text (match-string 1 text)))
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(jshell-eval text)))))
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(provide 'inferior-jshell)
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;;; inferior-jshell.el ends here
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6
init.el
6
init.el
@ -1765,10 +1765,16 @@ otherwise, call `bibtex-find-text'."
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;; My dev environment for ROS2
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(require 'arch-ros2)
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(require 'inferior-jshell)
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;; java-ts-mode
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(use-package java-ts-mode
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:hook ((java-ts-mode . trusted-files-eglot-ensure-if-safe)
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(java-ts-mode . my/-setup-java-ts-mode))
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:bind (:map java-ts-mode-map
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("C-c C-e" . jshell-eval-expression)
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("C-M-x" . jshell-eval-defun)
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("C-c C-r" . jshell-eval-region)
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("C-c C-b" . jshell-eval-buffer))
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:config
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(defun my/-setup-java-ts-mode ()
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(let ((rules (car treesit-simple-indent-rules)))
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