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