lisp/eshell/em-prompt.el

   1 ;;; em-prompt.el --- command prompts
   2
   3 ;; Copyright (C) 1999, 2000 Free Software Foundation
   4
   5 ;; Author: John Wiegley <johnw@gnu.org>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 (provide 'em-prompt)
  25
  26 (eval-when-compile (require 'esh-maint))
  27
  28 (defgroup eshell-prompt nil
  29   "This module provides command prompts, and navigation between them,
  30 as is common with most shells."
  31   :tag "Command prompts"
  32   :group 'eshell-module)
  33
  34 ;;; Commentary:
  35
  36 ;; Most of the prompt navigation commands of `comint-mode' are
  37 ;; supported, such as C-c C-n, C-c C-p, etc.
  38
  39 ;;; User Variables:
  40
  41 (defcustom eshell-prompt-load-hook '(eshell-prompt-initialize)
  42   "*A list of functions to call when loading `eshell-prompt'."
  43   :type 'hook
  44   :group 'eshell-prompt)
  45
  46 (defcustom eshell-prompt-function
  47   (function
  48    (lambda ()
  49      (concat (eshell/pwd)
  50              (if (= (user-uid) 0) " # " " $ "))))
  51   "*A function that returns the Eshell prompt string.
  52 Make sure to update `eshell-prompt-regexp' so that it will match your
  53 prompt."
  54   :type 'function
  55   :group 'eshell-prompt)
  56
  57 (defcustom eshell-prompt-regexp "^[^#$\n]* [#$] "
  58   "*A regexp which fully matches your eshell prompt.
  59 This setting is important, since it affects how eshell will interpret
  60 the lines that are passed to it.
  61 If this variable is changed, all Eshell buffers must be exited and
  62 re-entered for it to take effect."
  63   :type 'regexp
  64   :group 'eshell-prompt)
  65
  66 (defcustom eshell-highlight-prompt t
  67   "*If non-nil, Eshell should highlight the prompt."
  68   :type 'boolean
  69   :group 'eshell-prompt)
  70
  71 (defface eshell-prompt-face
  72   '((((class color) (background light)) (:foreground "Red" :bold t))
  73     (((class color) (background dark)) (:foreground "Pink" :bold t))
  74     (t (:bold t)))
  75   "*The face used to highlight prompt strings.
  76 For highlighting other kinds of strings -- similar to shell mode's
  77 behavior -- simply use an output filer which changes text properties."
  78   :group 'eshell-prompt)
  79
  80 (defcustom eshell-before-prompt-hook nil
  81   "*A list of functions to call before outputting the prompt."
  82   :type 'hook
  83   :options '(eshell-begin-on-new-line)
  84   :group 'eshell-prompt)
  85
  86 (defcustom eshell-after-prompt-hook nil
  87   "*A list of functions to call after outputting the prompt.
  88 Note that if `eshell-scroll-show-maximum-output' is non-nil, then
  89 setting `eshell-show-maximum-output' here won't do much.  It depends
  90 on whether the user wants the resizing to happen while output is
  91 arriving, or after."
  92   :type 'hook
  93   :options '(eshell-show-maximum-output)
  94   :group 'eshell-prompt)
  95
  96 ;;; Functions:
  97
  98 (defun eshell-prompt-initialize ()
  99   "Initialize the prompting code."
 100   (unless eshell-non-interactive-p
 101     (add-hook 'eshell-post-command-hook 'eshell-emit-prompt nil t)
 102
 103     (make-local-variable 'eshell-prompt-regexp)
 104     (if eshell-prompt-regexp
 105         (set (make-local-variable 'paragraph-start) eshell-prompt-regexp))
 106
 107     (set (make-local-variable 'eshell-skip-prompt-function)
 108          'eshell-skip-prompt)
 109
 110     (define-key eshell-command-map [(control ?n)] 'eshell-next-prompt)
 111     (define-key eshell-command-map [(control ?p)] 'eshell-previous-prompt)))
 112
 113 (defun eshell-emit-prompt ()
 114   "Emit a prompt if eshell is being used interactively."
 115   (run-hooks 'eshell-before-prompt-hook)
 116   (if (not eshell-prompt-function)
 117       (set-marker eshell-last-output-end (point))
 118     (let ((prompt (funcall eshell-prompt-function)))
 119       (and eshell-highlight-prompt
 120            (add-text-properties 0 (length prompt)
 121                                 '(read-only t
 122                                   face eshell-prompt-face
 123                                   rear-nonsticky (face read-only))
 124                                 prompt))
 125       (eshell-interactive-print prompt)))
 126   (run-hooks 'eshell-after-prompt-hook))
 127
 128 (defun eshell-backward-matching-input (regexp arg)
 129   "Search backward through buffer for match for REGEXP.
 130 Matches are searched for on lines that match `eshell-prompt-regexp'.
 131 With prefix argument N, search for Nth previous match.
 132 If N is negative, find the next or Nth next match."
 133   (interactive (eshell-regexp-arg "Backward input matching (regexp): "))
 134   (let* ((re (concat eshell-prompt-regexp ".*" regexp))
 135          (pos (save-excursion (end-of-line (if (> arg 0) 0 1))
 136                               (if (re-search-backward re nil t arg)
 137                                   (point)))))
 138     (if (null pos)
 139         (progn (message "Not found")
 140                (ding))
 141       (goto-char pos)
 142       (eshell-bol))))
 143
 144 (defun eshell-forward-matching-input (regexp arg)
 145   "Search forward through buffer for match for REGEXP.
 146 Matches are searched for on lines that match `eshell-prompt-regexp'.
 147 With prefix argument N, search for Nth following match.
 148 If N is negative, find the previous or Nth previous match."
 149   (interactive (eshell-regexp-arg "Forward input matching (regexp): "))
 150   (eshell-backward-matching-input regexp (- arg)))
 151
 152 (defun eshell-next-prompt (n)
 153   "Move to end of Nth next prompt in the buffer.
 154 See `eshell-prompt-regexp'."
 155   (interactive "p")
 156   (forward-paragraph n)
 157   (eshell-skip-prompt))
 158
 159 (defun eshell-previous-prompt (n)
 160   "Move to end of Nth previous prompt in the buffer.
 161 See `eshell-prompt-regexp'."
 162   (interactive "p")
 163   (eshell-next-prompt (- (1+ n))))
 164
 165 (defun eshell-skip-prompt ()
 166   "Skip past the text matching regexp `eshell-prompt-regexp'.
 167 If this takes us past the end of the current line, don't skip at all."
 168   (let ((eol (line-end-position)))
 169     (if (and (looking-at eshell-prompt-regexp)
 170              (<= (match-end 0) eol))
 171         (goto-char (match-end 0)))))
 172
 173 ;;; Code:
 174
 175 ;;; em-prompt.el ends here