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162 lines
6.4 KiB
162 lines
6.4 KiB
;;; haskell-menu.el --- A Haskell sessions menu -*- lexical-binding: t -*-
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;; Copyright (C) 2013 Chris Done
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;; Author: Chris Done <chrisdone@gmail.com>
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;; This file is not part of GNU Emacs.
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;;; Todo:
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;;; Code:
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(require 'cl-lib)
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(require 'haskell-compat)
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(require 'haskell-session)
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(require 'haskell-process)
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(require 'haskell-interactive-mode)
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(defcustom haskell-menu-buffer-name "*haskell-menu*"
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"The name of the Haskell session menu buffer"
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:group 'haskell-interactive
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:type 'string)
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;;;###autoload
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(defun haskell-menu ()
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"Launch the Haskell sessions menu."
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(interactive)
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(or (get-buffer haskell-menu-buffer-name)
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(with-current-buffer (get-buffer-create haskell-menu-buffer-name)
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(haskell-menu-mode)))
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(switch-to-buffer-other-window (get-buffer haskell-menu-buffer-name))
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(haskell-menu-revert-function nil nil))
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(defvar haskell-menu-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map (kbd "n") 'next-line)
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(define-key map (kbd "p") 'previous-line)
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(define-key map (kbd "RET") 'haskell-menu-mode-ret)
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map)
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"Keymap for `haskell-menu-mode'.")
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(define-derived-mode haskell-menu-mode special-mode "Haskell Session Menu"
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"Major mode for managing Haskell sessions.
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Each line describes one session.
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Letters do not insert themselves; instead, they are commands."
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(setq buffer-read-only t)
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(setq-local revert-buffer-function 'haskell-menu-revert-function)
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(setq truncate-lines t)
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(haskell-menu-revert-function nil t))
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(suppress-keymap haskell-menu-mode-map t)
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(defun haskell-menu-revert-function (_arg1 _arg2)
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"Function to refresh the display."
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(let ((buffer-read-only nil)
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(orig-line (line-number-at-pos))
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(orig-col (current-column)))
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(or (eq buffer-undo-list t)
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(setq buffer-undo-list nil))
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(erase-buffer)
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(haskell-menu-insert-menu)
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(goto-char (point-min))
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(forward-line (1- orig-line))
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(forward-char orig-col)))
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(defun haskell-menu-insert-menu ()
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"Insert the Haskell sessions menu to the current buffer."
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(if (null haskell-sessions)
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(insert "No Haskell sessions.")
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(haskell-menu-tabulate
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(list "Name" "PID" "Time" "RSS" "Cabal directory" "Working directory" "Command")
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(mapcar (lambda (session)
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(let ((process (haskell-process-process (haskell-session-process session))))
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(cond
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(process
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(let ((id (process-id process)))
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(list (propertize (haskell-session-name session) 'face 'buffer-menu-buffer)
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(if (process-live-p process) (number-to-string id) "-")
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(if (process-live-p process)
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(format-time-string "%H:%M:%S"
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(encode-time (cl-caddr (assoc 'etime (process-attributes id)))
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0 0 0 0 0))
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"-")
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(if (process-live-p process)
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(concat (number-to-string (/ (cdr (assoc 'rss (process-attributes id)))
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1024))
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"MB")
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"-")
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(haskell-session-cabal-dir session)
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(haskell-session-current-dir session)
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(mapconcat 'identity (process-command process) " "))))
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(t (list (propertize (haskell-session-name session) 'face 'buffer-menu-buffer)
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"—"
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"—"
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"—"
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(haskell-session-cabal-dir session)
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(haskell-session-current-dir session))))))
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haskell-sessions))))
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(defun haskell-menu-tabulate (headings rows)
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"Prints a list of lists as a formatted table to the current buffer."
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(let* ((columns (length headings))
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(widths (make-list columns 0)))
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;; Calculate column widths. This is kind of hideous.
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(dolist (row rows)
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(setq widths
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(let ((list (list)))
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(dotimes (i columns)
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(setq list (cons (max (nth i widths)
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(1+ (length (nth i row)))
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(1+ (length (nth i headings))))
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list)))
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(reverse list))))
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;; Print headings.
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(let ((heading (propertize " " 'display '(space :align-to 0))))
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(dotimes (i columns)
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(setq heading (concat heading
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(format (concat "%-" (number-to-string (nth i widths)) "s")
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(nth i headings)))))
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(setq header-line-format heading))
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;; Print tabulated rows.
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(dolist (row rows)
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(dotimes (i columns)
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(insert (format (concat "%-" (number-to-string (nth i widths)) "s")
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(nth i row))))
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(insert "\n"))))
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(defun haskell-menu-mode-ret ()
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"Handle RET key."
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(interactive)
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(let* ((name (save-excursion
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(goto-char (line-beginning-position))
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(buffer-substring-no-properties (point)
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(progn (search-forward " ")
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(forward-char -1)
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(point)))))
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(session (car (cl-remove-if-not (lambda (session)
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(string= (haskell-session-name session)
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name))
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haskell-sessions))))
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(switch-to-buffer (haskell-session-interactive-buffer session))))
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(provide 'haskell-menu)
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;;; haskell-menu.el ends here
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