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1 @c Copyright (C) 1996 John W. Eaton |
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2 @c Written by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at> on 1996/05/17 |
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3 @c Updated for octave.el version 0.8.3 by KH on 1996/07/02 |
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4 @c This is part of the Octave manual. |
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5 @c For copying conditions, see the file gpl.texi. |
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6 |
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7 @node Emacs, Installation, Amusements, Top |
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8 @chapter Using Emacs With Octave |
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9 |
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10 The development of Octave code can greatly be facilitated using Emacs |
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11 with Octave mode, a major mode for editing Octave files which can e.g.@: |
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12 automatically indent the code, do some of the typing (with Abbrev mode) |
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13 and show keywords, comments, strings, etc.@: in different faces (with |
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14 Font-lock mode on devices that support it). |
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15 |
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16 It is also possible to run Octave from within Emacs, either by directly |
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17 entering commands at the prompt in a buffer in Inferior Octave mode, or |
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18 by interacting with Octave from within a file with Octave code. This is |
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19 useful in particular for debugging Octave code. |
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20 |
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21 Finally, you can convince Octave to use the Emacs info reader for |
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22 @kbd{help -i}. |
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23 |
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24 All functionality is provided by the Emacs Lisp package @file{octave}. |
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25 This chapter describes how to set up and use this package. |
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26 |
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27 Please contact <Kurt.Hornik@@ci.tuwien.ac.at> if you have any questions |
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28 or suggestions on using Emacs with Octave. |
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29 |
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30 @menu |
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31 * Setting Up Octave Mode:: |
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32 * Using Octave Mode:: |
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33 * Running Octave From Within Emacs:: |
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34 * Using the Emacs Info Reader for Octave:: |
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35 @end menu |
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36 |
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37 @node Setting Up Octave Mode, Using Octave Mode, Emacs, Emacs |
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38 @section Setting Up Octave Mode |
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39 |
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40 If you are lucky, your sysadmins have already arranged everything so |
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41 that Emacs automatically goes into Octave mode whenever you visit an |
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42 Octave code file as characterized by its extension @file{.m}. If not, |
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43 proceed as follows. |
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44 |
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45 @enumerate |
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46 @item |
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47 Make sure that the file @file{octave.el} (or even better, its |
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48 byte-compiled version @file{octave.elc}) from the Octave distribution is |
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49 somewhere in your load-path. |
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50 |
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51 @quotation |
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52 @strong{Note:} The current version of @file{octave.el} was developed, |
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53 tested and byte-compiled under GNU Emacs 19.31. It may not work under |
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54 other Emacs versions, in particular under XEmacs. |
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55 @end quotation |
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56 |
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57 @item |
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58 To begin using Octave mode for all @file{.m} files you visit, add the |
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59 following lines to a file loaded by Emacs at startup time, typically |
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60 your @file{~/.emacs} file: |
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61 |
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62 @lisp |
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63 (autoload 'octave-mode "octave" nil t) |
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64 (setq auto-mode-alist |
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65 (cons '(\"\\\\.m$\" . octave-mode) auto-mode-alist)) |
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66 @end lisp |
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67 |
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68 @item |
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69 Finally, to turn on the abbrevs, auto-fill and font-lock features |
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70 automatically, also add the following lines to one of the Emacs startup |
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71 files: |
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72 @lisp |
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73 (add-hook 'octave-mode-hook |
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74 (lambda () |
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75 (abbrev-mode 1) |
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76 (auto-fill-mode 1) |
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77 (if (eq window-system 'x) |
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78 (font-lock-mode 1)))) |
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79 @end lisp |
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80 See the Emacs manual for more information about how to customize |
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81 Font-lock mode. |
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82 @end enumerate |
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83 |
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84 @node Using Octave Mode, Running Octave From Within Emacs, Setting Up Octave Mode, Emacs |
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85 @section Using Octave Mode |
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86 |
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87 In Octave mode, the following special Emacs commands can be used in |
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88 addition to the standard Emacs commands. |
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89 |
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90 @table @kbd |
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91 @item C-h m |
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92 Describe the features of Octave mode. |
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93 |
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94 @item LFD |
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95 Reindent the current Octave line, insert a newline and indent the new |
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96 line (@code{octave-reindent-then-newline-and-indent}). An abbrev before |
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97 point is expanded if @code{abbrev-mode} is non-@code{nil}. |
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98 |
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99 @item TAB |
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100 Indents current Octave line based on its contents and on previous |
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101 lines (@code{indent-according-to-mode}). |
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102 |
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103 @item ; |
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104 Insert an ``electric'' semicolon (@code{octave-electric-semi}). If |
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105 @code{octave-auto-indent} is non-@code{nil}, typing a @samp{;} |
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106 automatically reindents the current line, inserts a newline and indents |
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107 the new line. |
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108 |
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109 @item ` |
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110 Start entering an abbreviation (@code{octave-abbrev-start}). If Abbrev |
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111 mode is turned on, typing @kbd{`C-h} or @kbd{`?} lists all abbrevs. |
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112 Any other key combination is executed normally. |
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113 |
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114 @item M-LFD |
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115 Break line at point and insert continuation marker and alignment |
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116 (@code{octave-split-line}). |
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117 |
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118 @item M-TAB |
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119 Perform completion on Octave symbol preceding point, comparing that |
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120 symbol against Octave's reserved words and builtin variables |
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121 (@code{octave-complete-symbol}). |
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122 |
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123 @item M-C-a |
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124 Move backward to the beginning of a function |
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125 (@code{octave-beginning-of-defun}). |
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126 With prefix argument @var{N}, do it that many times if @var{N} is |
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127 positive; otherwise, move forward to the @var{N}-th following beginning |
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128 of a function. |
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129 |
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130 @item M-C-e |
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131 Move forward to the end of a function (@code{octave-end-of-defun}). |
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132 With prefix argument @var{N}, do it that many times if @var{N} is |
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133 positive; otherwise, move back to the @var{N}-th preceding end of a |
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134 function. |
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135 |
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136 @item M-C-h |
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137 Puts point at beginning and mark at the end of the current Octave |
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138 function, i.e., the one containing point or following point |
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139 (@code{octave-mark-defun}). |
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140 |
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141 @item M-C-q |
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142 Properly indents the Octave function which contains point |
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143 (@code{octave-indent-defun}). |
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144 |
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145 @item C-c ; |
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146 Puts the first character of @code{octave-comment-start} (usually |
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147 @samp{#}) at the beginning of every line in the region |
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148 (@code{octave-comment-region}). With just @kbd{C-u} prefix argument, |
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149 uncomment each line in the region. |
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150 |
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151 @item C-c : |
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152 Uncomments every line in the region (@code{octave-uncomment-region}). |
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153 |
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154 @item C-c C-p |
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155 Move one line of Octave code backward, skipping empty and comment lines |
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156 (@code{octave-previous-code-line}). With numeric prefix argument |
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157 @var{N}, move that many code lines backward (forward if @var{N} is |
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158 negative). |
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159 |
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160 @item C-c C-n |
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161 Move one line of Octave code forward, skipping empty and comment lines |
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162 (@code{octave-next-code-line}). With numeric prefix argument @var{N}, |
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163 move that many code lines forward (backward if @var{N} is negative). |
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164 |
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165 @item C-c C-a |
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166 Move to the `real' beginning of the current line |
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167 (@code{octave-beginning-of-line}). If point is in an empty or comment |
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168 line, simply go to its beginning; otherwise, move backwards to the |
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169 beginning of the first code line which is not inside a continuation |
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170 statement, i.e., which does not follow a code line ending in @samp{...} |
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171 or @samp{\}, or is inside an open parenthesis list. |
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172 |
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173 @item C-c C-e |
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174 Move to the `real' end of the current line (@code{octave-end-of-line}). |
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175 If point is in a code line, move forward to the end of the first Octave |
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176 code line which does not end in @samp{...} or @samp{\} or is inside an |
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177 open parenthesis list. Otherwise, simply go to the end of the current |
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178 line. |
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179 |
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180 @item C-c M-C-n |
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181 Move forward across one balanced begin-end block of Octave code |
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182 (@code{octave-forward-block}). With numeric prefix argument @var{N}, |
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183 move forward across @var{n} such blocks (backward if @var{N} is |
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184 negative). |
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185 |
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186 @item C-c M-C-p |
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187 Move back across one balanced begin-end block of Octave code |
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188 (@code{octave-backward-block}). With numeric prefix argument @var{N}, |
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189 move backward across @var{N} such blocks (forward if @var{N} is |
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190 negative). |
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191 |
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192 @item C-c M-C-d |
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193 Move forward down one begin-end block level of Octave code |
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194 (@code{octave-down-block}). With numeric prefix argument, do it that |
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195 many times; a negative argument means move backward, but still go down |
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196 one level. |
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197 |
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198 @item C-c M-C-u |
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199 Move backward out of one begin-end block level of Octave code |
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200 (@code{octave-backward-up-block}). With numeric prefix argument, do it |
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201 that many times; a negative argument means move forward, but still to a |
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202 less deep spot. |
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203 |
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204 @item C-c M-C-h |
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205 Put point at the beginning of this block, mark at the end |
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206 (@code{octave-mark-block}). |
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207 The block marked is the one that contains point or follows point. |
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208 |
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209 @item C-c ] |
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210 Close the current block on a separate line (@code{octave-close-block}). |
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211 An error is signaled if no block to close is found. |
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212 |
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213 @item C-c f |
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214 Insert a function skeleton, prompting for the function's name, arguments |
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215 and return values which have to be entered without parens |
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216 (@code{octave-insert-defun}). |
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217 |
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218 @item C-c C-h |
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219 Search the function, operator and variable indices of all info files |
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220 with documentation for Octave for entries (@code{octave-help}). If used |
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221 interactively, the entry is prompted for with completion. If multiple |
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222 matches are found, one can cycle through them using the standard |
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223 @samp{,} (@code{Info-index-next}) command of the Info reader. |
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224 |
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225 The variable @code{octave-help-files} is a list of files to search |
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226 through and defaults to @code{'("octave")}. If there is also an Octave |
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227 Local Guide with corresponding info file @file{octave-LG} (for example), |
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228 you can have @code{octave-help} search both files by |
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229 @lisp |
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230 (setq octave-help-files '("octave" "octave-LG")) |
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231 @end lisp |
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232 @noindent |
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233 in one of your Emacs startup files. |
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234 |
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235 @end table |
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236 |
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237 A common problem is that the @key{RET} key does @emph{not} indent the |
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238 line to where the new text should go after inserting the newline. This |
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239 is because the standard Emacs convention is that @key{RET} (aka |
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240 @kbd{C-m}) just adds a newline, whereas @key{LFD} (aka @kbd{C-j}) adds a |
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241 newline and indents it. This is particularly inconvenient for users with |
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242 keyboards which do not have a special @key{LFD} key at all; in such |
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243 cases, it is typically more convenient to use @key{RET} as the @key{LFD} |
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244 key (rather than typing @kbd{C-j}). |
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245 |
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246 You can make @key{RET} do this by adding |
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247 @lisp |
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248 (define-key octave-mode-map "\C-m" |
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249 'octave-reindent-then-newline-and-indent) |
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250 @end lisp |
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251 @noindent |
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252 to one of your Emacs startup files. Another, more generally applicable |
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253 solution is |
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254 @lisp |
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255 (defun RET-behaves-as-LFD () |
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256 (let ((x (key-binding "\C-j"))) |
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257 (local-set-key "\C-m" x))) |
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258 (add-hook 'octave-mode-hook 'return-behaves-as-LFD) |
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259 @end lisp |
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260 @noindent |
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261 (this works for all modes by adding to the startup hooks, without having |
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262 to know the particular binding of @key{RET} in that mode!). Similar |
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263 considerations apply for using @key{M-RET} as @key{M-LFD}. As Barry |
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264 A. Warsaw <bwarsaw@@cnri.reston.va.us> says in the documentation for his |
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265 @code{cc-mode}, ``This is a very common question. @code{:-)} If you want |
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266 this to be the default behavior, don't lobby me, lobby RMS!'' |
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267 |
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268 The following variables can be used to customize Octave mode. |
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269 |
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270 @table @code |
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271 @item octave-auto-newline |
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272 Non-@code{nil} means auto-insert a newline and indent after semicolons |
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273 are typed. The default value is @code{nil}. |
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274 |
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275 @item octave-blink-matching-block |
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276 Non-@code{nil} means show matching begin of block when inserting a space, |
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277 newline or @samp{;} after an else or end keyword. Default is @code{t}. |
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278 This is an extremely useful feature for automatically verifying that the |
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279 keywords match---if they don't, an error message is displayed. |
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280 |
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281 @item octave-block-offset |
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282 Extra indentation applied to statements in block structures. |
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283 Default is 2. |
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284 |
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285 @item octave-comment-column |
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286 Column to indent right-margin comments to. |
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287 Default is 32. |
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288 (Such comments are created using @key{M-;} (@code{indent-for-comment}).) |
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289 |
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290 @item octave-comment-start |
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291 Delimiter inserted to start new comment. |
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292 Default value is @samp{# }. |
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293 |
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294 @item octave-continuation-offset |
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295 Extra indentation applied to Octave continuation lines. |
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296 Default is 4. |
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297 |
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298 @item octave-continuation-string |
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299 String used for Octave continuation lines. |
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300 Normally @samp{\}. |
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301 |
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302 @item octave-fill-column |
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303 Column beyond which automatic line-wrapping should happen. |
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304 Default is 72. |
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305 |
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306 @item octave-inhibit-startup-message |
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307 If @code{t}, no startup message is displayed when Octave mode is |
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308 called. |
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309 Default is @code{nil}. |
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310 |
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311 @end table |
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312 |
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313 If Font Lock mode is enabled, Octave mode will display |
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314 @itemize @bullet |
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315 @item |
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316 strings in @code{font-lock-string-face} |
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317 @item |
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318 comments in @code{font-lock-comment-face} |
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319 @item |
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320 the Octave reserved words (such as all block keywords) and the text |
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321 functions (such as @samp{cd} or @samp{who}) which are also reserved |
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322 using @code{font-lock-keyword-face} |
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323 @item |
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324 the builtin operators (@samp{&&}, @samp{<>}, @dots{}) using |
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325 @code{font-lock-reference-face} |
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326 @item |
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327 the builtin variables (such as @samp{prefer_column_vectors}, @samp{NaN} |
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328 or @samp{LOADPATH}) in @code{font-lock-variable-name-face} |
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329 @item |
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330 and the function names in function declarations in |
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331 @code{font-lock-function-name-face}. |
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332 @end itemize |
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333 |
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334 There is also rudimentary support for Imenu (currently, function names |
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335 can be indexed). |
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336 |
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337 Customization of Octave mode can be performed by modification of the |
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338 variable @code{octave-mode-hook}. It the value of this variable is |
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339 non-@code{nil}, turning on Octave mode calls its value. |
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340 |
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341 If you discover a problem with Octave mode, you can conveniently send a |
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342 bug report using @kbd{C-c C-b} (@code{octave-submit-bug-report}). This |
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343 automatically sets up a mail buffer with version information already |
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344 added. You just need to add a description of the problem, including a |
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345 reproducible test case and send the message. |
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346 |
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347 @node Running Octave From Within Emacs, Using the Emacs Info Reader for Octave, Using Octave Mode, Emacs |
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348 @section Running Octave From Within Emacs |
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349 |
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350 The package @file{octave} provides commands for running an inferior |
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351 Octave process in a special Emacs buffer. Use |
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352 @lisp |
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353 M-x run-octave |
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354 @end lisp |
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355 @noindent |
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356 to directly start an inferior Octave process. If Emacs does not know |
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357 about this command, add the line |
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358 @lisp |
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359 (autoload 'run-octave "octave" nil t) |
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360 @end lisp |
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361 @noindent |
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362 to your @file{.emacs} file. |
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363 |
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364 This will start Octave in a special buffer the name of which is |
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365 specified by the variable @code{inferior-octave-buffer} and defaults to |
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366 @code{"*Octave Interaction*"}. From within this buffer, you can |
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367 interact with the inferior Octave process `as usual', i.e., by entering |
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368 Octave commands at the prompt. |
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369 |
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370 You can also communicate with an inferior Octave process from within |
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371 files with Octave code (i.e., buffers in Octave mode), using the |
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372 following commands. |
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373 |
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374 @table @kbd |
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375 @item C-c i l |
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376 Send the current line to the inferior Octave process |
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377 (@code{octave-send-line}). |
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378 With positive prefix argument @var{N}, send that many lines. |
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379 If @code{octave-send-line-auto-forward} is non-@code{nil}, go to the |
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380 next unsent code line. |
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381 @item C-c i b |
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382 Send the current block to the inferior Octave process |
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383 (@code{octave-send-block}). |
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384 @item C-c i f |
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385 Send the current function to the inferior Octave process |
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386 (@code{octave-send-defun}). |
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387 @item C-c i r |
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388 Send the region to the inferior Octave process |
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389 (@code{octave-send-region}). |
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390 @item C-c i s |
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391 Make sure that `inferior-octave-buffer' is displayed |
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392 (@code{octave-show-process-buffer}). |
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393 @item C-c i h |
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394 Delete all windows that display @file{inferior-octave-buffer} |
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395 (@code{octave-hide-process-buffer}). |
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396 @item C-c i k |
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397 Kill the inferior Octave process and its buffer |
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398 (@code{octave-kill-process}). |
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399 @end table |
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400 |
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401 The effect of the commands which send code to the Octave process can be |
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402 customized by the following variables. |
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403 @table @code |
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404 @item octave-send-echo-input |
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405 Non-@code{nil} means echo input sent to the inferior Octave process. |
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406 Default is @code{t}. |
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407 |
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408 @item octave-send-show-buffer |
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409 Non-@code{nil} means display the buffer running the Octave process after |
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410 sending a command (but without selecting it). |
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411 Default is @code{t}. |
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412 @end table |
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413 |
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414 If you send code and there is no inferior Octave process yet, it will be |
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415 started automatically. |
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416 |
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417 The startup of the inferior Octave process is highly customizable. |
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418 The variable @code{inferior-octave-startup-args} can be used for |
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419 specifying command lines arguments to be passed to Octave on startup |
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420 as a list of strings. For example, to suppress the startup message and |
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421 use `traditional' mode, set this to @code{'("-q" "--traditional")}. |
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422 You can also specify a startup file of Octave commands to be loaded on |
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423 startup; note that these commands will not produce any visible output |
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424 in the process buffer. Which file to use is controlled by the variable |
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425 @code{inferior-octave-startup-file}. If this is @code{nil}, the file |
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426 @file{~/.emacs_octave} is used if it exists. |
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427 |
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428 And finally, @code{inferior-octave-mode-hook} is run after starting the |
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429 process and putting its buffer into Inferior Octave mode. Hence, if you |
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430 like the up and down arrow keys to behave in the interaction buffer as |
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431 in the shell, and you want this buffer to use nice colors, add |
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432 @lisp |
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433 (add-hook 'inferior-octave-mode-hook |
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434 (lambda () |
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435 (turn-on-font-lock) |
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436 (define-key inferior-octave-mode-map [up] |
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437 'comint-previous-input) |
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438 (define-key inferior-octave-mode-map [down] |
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439 'comint-next-input))) |
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440 @end lisp |
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441 @noindent |
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442 to your @file{.emacs} file. You could also swap the roles of @kbd{C-a} |
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443 (@code{beginning-of-line}) and @code{C-c C-a} (@code{comint-bol}) using |
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444 this hook. |
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445 |
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446 @quotation |
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447 @strong{Note:} |
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448 If you set your Octave prompts to something different from the defaults, |
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449 make sure that @code{inferior-octave-prompt} matches them. |
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450 Otherwise, @emph{nothing} will work, because Emacs will have no idea |
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451 when Octave is waiting for input, or done sending output. |
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452 @end quotation |
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453 |
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454 @node Using the Emacs Info Reader for Octave, , Running Octave From Within Emacs, Emacs |
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455 @section Using the Emacs Info Reader for Octave |
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456 |
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457 You can also set up the Emacs Info reader for dealing with the results |
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458 of Octave's @samp{help -i}. For this, the package @file{gnuserv} needs |
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459 to be installed, which unfortunately still does not come with GNU Emacs |
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460 (it does with XEmacs). It can be retrieved from any GNU Emacs Lisp Code |
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461 Directory archive, e.g.@: |
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462 @file{ftp://ftp.cis.ohio-state.edu/pub/gnu/emacs/elisp-archive}, |
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463 in the @file{packages} subdirectory. There is also a newer version |
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464 around (use archie to look for @file{gnuserv-2.1alpha.tar.gz}). |
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465 |
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466 If @file{gnuserv} is installed, add the lines |
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467 @lisp |
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468 (autoload 'octave-help "octave" nil t) |
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469 (require 'gnuserv) |
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470 (gnuserv-start) |
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471 @end lisp |
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472 @noindent |
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473 to your @file{.emacs} file. |
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474 |
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475 You can use either `plain' Emacs Info or the function @code{octave-help} |
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476 as your Octave info reader (for @samp{help -i}). In the former case, |
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477 set the Octave variable @code{INFO_PROGRAM} to @code{"info-emacs-info"}. |
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478 The latter is perhaps more attractive because it allows to look up keys |
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479 in the indices of @emph{several} info files related to Octave (provided |
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480 that the Emacs variable @code{octave-help-files} is set correctly). In |
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481 this case, set @code{INFO_PROGRAM} to @code{"info-emacs-octave-help"}. |
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482 |
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483 If you use Octave from within Emacs, these settings are best done in the |
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484 @file{~/.emacs_octave} startup file (or the file pointed to by the Emacs |
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485 variable @code{inferior-octave-startup-file}). |
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486 |
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487 @c Local Variables: |
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488 @c TeX-command-default: "Texinfo" |
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489 @c End: |
