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104 lines
3.5 KiB
104 lines
3.5 KiB
9 years ago
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;;; haskell-presentation-mode.el --- Presenting Haskell things -*- 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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;;; Code:
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(require 'haskell-mode)
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(require 'haskell-session)
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(define-derived-mode haskell-presentation-mode
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haskell-mode "Presentation"
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"Major mode for viewing Haskell snippets.
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\\{hypertext-mode-map}"
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(setq case-fold-search nil))
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(defconst haskell-presentation-buffer-name
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"*Haskell Presentation*"
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"Haskell Presentation buffer name.")
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(defconst haskell-presentation-hint-message
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"-- Hit `q' to close this window; `c' to clear.\n\n"
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"Hint message appered in Haskell Presentation buffer.")
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(easy-mmode-defmap
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haskell-presentation-mode-map
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`(("q" . quit-window)
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("c" . haskell-presentation-clear))
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"The base key map for `haskell-presentation-mode'.")
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(defun haskell-presentation-buffer ()
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"Return Haskell Presentaion buffer.
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Return current presenation buffer or create new one if absent.
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Never returns nil."
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;; TODO Provide interactive calling options: when called interactively make
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;; the presentation buffer current.
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(let ((may-buffer (get-buffer haskell-presentation-buffer-name)))
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(if may-buffer
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may-buffer
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(let ((buffer (generate-new-buffer haskell-presentation-buffer-name)))
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(with-current-buffer buffer
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(insert haskell-presentation-hint-message)
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(haskell-presentation-mode)
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(setq buffer-read-only t))
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buffer))))
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(defun haskell-presentation-clear ()
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"Clear Haskell Presentation buffer."
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(interactive)
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(let ((hp-buf (get-buffer haskell-presentation-buffer-name)))
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(when hp-buf
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(with-current-buffer hp-buf
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(let ((buffer-read-only nil))
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(erase-buffer)
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(insert haskell-presentation-hint-message))))))
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(defun haskell-presentation-present (session code &optional clear)
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"Present given code in a popup buffer.
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Creates temporal Haskell Presentation buffer and assigns it to
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given haskell SESSION; presented CODE will be fontified as
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haskell code. Give an optional non-nil CLEAR arg to clear the
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buffer before presenting message."
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(let ((buffer (haskell-presentation-buffer)))
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(with-current-buffer buffer
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(when (boundp 'shm-display-quarantine)
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(set (make-local-variable 'shm-display-quarantine) nil))
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(when clear (haskell-presentation-clear))
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(haskell-session-assign session)
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(save-excursion
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(let ((buffer-read-only nil))
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(goto-char (point-min))
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(forward-line 2)
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(insert code "\n\n"))))
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(if (eq major-mode 'haskell-presentation-mode)
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(switch-to-buffer buffer)
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(pop-to-buffer buffer))))
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(provide 'haskell-presentation-mode)
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;;; haskell-presentation-mode.el ends here
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