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doc: Small fixes to the octave manual (bug #40557). * contrib.txi: Correct missing word "few" in sentence. * install.txi: Add gl2ps to list of external packages. Remove WebKit from list of required Qt modules.
author Rik <rik@octave.org>
date Tue, 03 Dec 2013 20:54:30 -0800
parents d63878346099
children 3e731fc1e4d5
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1 @c Copyright (C) 2012 John W. Eaton
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2 @c Copyright (C) 2008-2013 Jaroslav Hajek
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3 @c
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4 @c This file is part of Octave.
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5 @c
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6 @c Octave is free software; you can redistribute it and/or modify it
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7 @c under the terms of the GNU General Public License as published by the
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8 @c Free Software Foundation; either version 3 of the License, or (at
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9 @c your option) any later version.
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10 @c
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11 @c Octave is distributed in the hope that it will be useful, but WITHOUT
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12 @c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 @c FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 @c for more details.
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15 @c
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16 @c You should have received a copy of the GNU General Public License
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17 @c along with Octave; see the file COPYING. If not, see
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18 @c <http://www.gnu.org/licenses/>.
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19
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20 @node Contributing Guidelines
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21 @appendix Contributing Guidelines
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22 @cindex coding standards
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23 @cindex Octave development
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24
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25 This chapter is dedicated to those who wish to contribute code to Octave.
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26
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27 @menu
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28 * How to Contribute::
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29 * Building the Development Sources::
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30 * Basics of Generating a Changeset::
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31 * General Guidelines::
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32 * Octave Sources (m-files)::
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33 * C++ Sources::
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34 * Other Sources::
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35 @end menu
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36
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37 @node How to Contribute
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38 @section How to Contribute
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39 The mailing list for Octave development discussion is
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40 @email{maintainers@@octave.org}. Patches should be submitted to
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41 @url{https://savannah.gnu.org/patch/?func=additem&group=octave, Octave's patch tracker}.
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42 This concerns the development of Octave core, i.e., code that goes to Octave
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43 directly. You may consider developing and publishing a package instead;
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44 a great place for this is the allied Octave-Forge project
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45 (@url{http://octave.sourceforge.net}). Note that the Octave core
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46 project is inherently more conservative and follows narrower rules.
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47
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48 @node Building the Development Sources
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49 @section Building the Development Sources
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50
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51 The directions for building from the Development sources change from
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52 time to time, so you should read the resources for developers on the web
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53 or in the development sources archive. Start here:
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54 @url{http://www.octave.org/get-involved.html}.
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55
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56 @node Basics of Generating a Changeset
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57 @section Basics of Generating a Changeset
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58
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59 The preferable form of contribution is creating a Mercurial changeset
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60 and submit it to the @url{http://savannah.gnu.org/bugs/?group=octave, bug} or
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61 @url{http://savannah.gnu.org/patch/?func=additem&group=octave, patch}
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62 trackers@footnote{Please use the patch tracker only for patches which add new
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63 features. If you have a patch to submit that fixes a bug, you should use the
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64 bug tracker instead.}.
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65 Mercurial is the source code management system currently used to develop
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66 Octave. Other forms of contributions (e.g., simple diff patches) are
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67 also acceptable, but they slow down the review process. If you want to
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68 make more contributions, you should really get familiar with Mercurial.
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69 A good place to start is
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70 @url{http://www.selenic.com/mercurial/wiki/index.cgi/Tutorial}. There
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71 you will also find help how to install Mercurial.
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72
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73 A simple contribution sequence could look like this:
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74
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75 @example
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76 @group
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77 hg clone http://www.octave.org/hg/octave
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78 # make a local copy of the octave
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79 # source repository
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80 cd octave
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81 # change some sources@dots{}
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82 hg commit -m "make Octave the coolest software ever"
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83 # commit the changeset into your
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84 # local repository
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85 hg export -o ../cool.diff tip
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86 # export the changeset to a diff
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87 # file
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88 # attach ../cool.diff to your bug report
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89 @end group
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90 @end example
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91
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92 You may want to get familiar with Mercurial queues to manage your
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93 changesets. For working with queues you have to activate the extension
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94 @nospell{mq} with the following entry in Mercurial's configuration file
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95 @file{.hgrc} (or @file{Mercurial.ini} on Windows):
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96
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97 @example
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98 @group
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99 [extensions]
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100 mq=
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101 @end group
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102 @end example
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103
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104 Here is a slightly more complex example using Mercurial
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105 queues, where work on two unrelated changesets is done in parallel and
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106 one of the changesets is updated after discussion on the bug tracker:
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107
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108 @example
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109 hg qnew nasty_bug # create a new patch
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110 # change sources@dots{}
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111 hg qref # save the changes into the patch
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112 # change even more@dots{}
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113 hg qref -m "solution to nasty bug!"
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114 # save again with commit message
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115 hg export -o ../nasty.diff tip
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116 # export the patch
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117 # attach ../nasty.diff to your bug report
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118 hg qpop # undo the application of the patch
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119 # and remove the changes from the
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120 # source tree
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121 hg qnew doc_improvements # create an unrelated patch
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122 # change doc sources@dots{}
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123 hg qref -m "could not find myfav.m in the doc"
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124 # save the changes into the patch
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125 hg export -o ../doc.diff tip
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126 # export the second patch
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127 # attach ../doc.diff to your bug report
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128 hg qpop
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129 # discussion in the bug tracker @dots{}
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130 hg qpush nasty_bug # apply the patch again
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131 # change sources yet again @dots{}
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132 hg qref
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133 hg export -o ../nasty2.diff tip
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134 # attach ../nasty2.diff to your bug report
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135 @end example
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136
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137 Mercurial has a few more useful extensions that really should be enabled.
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138 They are not enabled by default due to a number of factors
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139 (mostly because they don't work in all terminal types).
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140
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141 The following entries in the @file{.hgrc} are recommended
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142
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143 @example
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144 @group
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145 [extensions]
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146 graphlog=
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147 color=
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148 progress=
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149 pager=
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150 @end group
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151 @end example
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152
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153 For the color extension, default color and formatting
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154 of @code{hg status} can be modified by
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155
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156 @example
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157 @group
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158 [color]
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159 status.modified = magenta bold
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160 status.added = green bold
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161 status.removed = red bold
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162 status.deleted = cyan bold
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163 status.unknown = black bold
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164 status.ignored = black bold
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165 @end group
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166 @end example
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167
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168 Sometimes a few further improvements for the pager extension are
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169 necessary. The following options should not be enabled unless paging
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170 isn't working correctly:
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171
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172 @example
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173 @group
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174 [pager]
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175 # Some options for the less pager, see less(1) for their meaning.
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176 pager = LESS='FSRX' less
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177
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178 # Some commands that aren't paged by default; also enable paging
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179 # for them
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180 attend = tags, help, annotate, cat, diff, export, status, \
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181 outgoing, incoming
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182 @end group
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183 @end example
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184
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185 Enabling the described extensions should immediately lead to a difference
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186 when using the command line version of @nospell{hg}. Of these options, the
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187 only one that enables a new command is @nospell{graphlog}. It is recommanded
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188 that you use the command @code{hg glog} instead of @code{hg log} for a better
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189 feel what commits are being based on.
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190
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191 @node General Guidelines
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192 @section General Guidelines
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193
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194 All Octave's sources are distributed under the General Public License
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195 (GPL). Currently, Octave uses GPL version 3. For details about this
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196 license, see @url{http://www.gnu.org/licenses/gpl.html}. Therefore,
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197 whenever you create a new source file, it should have the following
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198 comment header (use appropriate year, name and comment marks):
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199
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200 @example
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201 ## Copyright (C) 1996-2013 John W. Eaton <jwe@@octave.org>
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202 ##
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203 ## This file is part of Octave.
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204 ##
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205 ## Octave is free software; you can redistribute it and/or
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206 ## modify it under the terms of the GNU General Public
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207 ## License as published by the Free Software Foundation;
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208 ## either version 3 of the License, or (at your option) any
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209 ## later version.
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210 ##
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211 ## Octave is distributed in the hope that it will be useful,
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212 ## but WITHOUT ANY WARRANTY; without even the implied
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213 ## warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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214 ## PURPOSE. See the GNU General Public License for more
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215 ## details.
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216 ##
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217 ## You should have received a copy of the GNU General Public
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218 ## License along with Octave; see the file COPYING. If not,
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219 ## see <http://www.gnu.org/licenses/>.
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220 @end example
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221
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222 Always include commit messages in changesets. After making your source
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223 changes, record and briefly describe the changes in your commit message.
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224 You should have previously configured your @file{.hgrc} (or
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225 @file{Mercurial.ini} on Windows) with your name and email, which will
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226 get automatically added to your commit message. Your commit message
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227 should have a brief one-line explanation of what the commit does. If you
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228 are patching a bug, this one-line explanation should mention the bug
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229 number at the end. If your change is small and only touches one file,
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230 this is typically sufficient. If you are modifying several files or
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231 several parts of one file, you should enumerate your changes roughly
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232 following the GNU coding standards on changelogs, like the following
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233 example:
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234
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235 @example
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236 @group
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237 look for methods before constructors
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238
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239 * symtab.cc (symbol_table::fcn_info::fcn_info_rep::find):
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240 Look for class methods before constructors, contrary to @sc{matlab}
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241 documentation.
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242
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243 * test/ctor-vs-method: New directory of test classes.
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244 * test/test_ctor_vs_method.m: New file.
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245 * test/Makefile.am: Include ctor-vs-method/module.mk.
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246 (FCN_FILES): Include test_ctor_vs_method.m in the list.
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247 @end group
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248 @end example
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249
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250 @noindent
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251 In this example, the names of files is mentioned, and in parentheses the
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252 name of the function in that file that was modified. There is no need to
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253 mention the function for m-files that only contain one function. The
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254 commit message should describe what is changed, not why. Any explanation
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255 of why a change is needed should appear as comments in the code,
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256 particularly if there is something that might not be obvious to someone
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257 reading it later.
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258
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259 When submitting code which addresses a known bug on the Octave bug
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260 tracker (@url{http://bugs.octave.org}), please add '(bug #XXXXX)' to the
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261 first line of the commit messages. For example:
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262
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263 @example
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264 @group
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265 Fix bug for complex input for gradient (bug #34292).
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266 @end group
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267 @end example
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268
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269 The preferred comment mark for places that may need further attention is
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270 FIXME.
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271
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272 @node Octave Sources (m-files)
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273 @section Octave Sources (m-files)
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274
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275 Don't use tabs. Tabs cause trouble. If you are used to them, set up
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276 your editor so that it converts tabs to spaces. Indent the bodies of
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277 the statement blocks. Recommended indent is 2 spaces. When calling
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278 functions, put spaces after commas and before the calling parentheses,
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279 like this:
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280
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281 @example
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282 x = max (sin (y+3), 2);
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283 @end example
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284
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285 @noindent
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286 An exception are matrix and vector constructors:
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287
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288 @example
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289 [sin(x), cos(x)]
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290 @end example
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291
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292 @noindent
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293 Here, putting spaces after @code{sin}, @code{cos} would result in a
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294 parse error. In indexing expression, do not put a space after the
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295 identifier (this differentiates indexing and function calls nicely).
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296 The space after comma is not necessary if index expressions are simple,
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297 i.e., you may write
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298
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299 @example
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300 A(:,i,j)
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301 @end example
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302
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303 @noindent
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304 but
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305
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306 @example
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307 A([1:i-1;i+1:n], XI(:,2:n-1))
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308 @end example
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309
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310 Use lowercase names if possible. Uppercase is acceptable for variable
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311 names consisting of 1-2 letters. Do not use mixed case names. Function
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312 names must be lowercase. Function names are global, so choose them
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313 wisely.
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314
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315 Always use a specific end-of-block statement (like @code{endif},
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316 @code{endswitch}) rather than generic @code{end}.
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317
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318 Enclose the @code{if}, @code{while}, @code{until} and @code{switch}
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319 conditions in parentheses, like in C:
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320
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321 @example
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322 @group
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323 if (isvector (a))
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324 s = sum (a);
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325 endif
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326 @end group
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327 @end example
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328
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329 @noindent
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330 Do not do this, however, with the iteration counter portion of a
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331 @code{for} statement. Write:
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332
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333 @example
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334 @group
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335 for i = 1:n
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336 b(i) = sum (a(:,i));
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337 endfor
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338 @end group
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339 @end example
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340
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341 @node C++ Sources
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342 @section C++ Sources
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343
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344 Don't use tabs. Tabs cause trouble. If you are used to them, set up
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345 your editor so that it converts tabs to spaces. Format function headers
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346 like this:
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347
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348 @example
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349 @group
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350 static bool
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351 matches_patterns (const string_vector& patterns, int pat_idx,
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352 int num_pat, const std::string& name)
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353 @end group
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354 @end example
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355
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356 @noindent
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357 The function name should start in column 1, and multi-line argument
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358 lists should be aligned on the first char after the open parenthesis.
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359 You should put a space before the left open parenthesis and after commas,
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360 for both function definitions and function calls.
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361
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362 Recommended indent is 2 spaces. When indenting, indent the statement
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363 after control structures (like @code{if}, @code{while}, etc.). If there
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364 is a compound statement, indent @emph{both} the curly braces and the
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365 body of the statement (so that the body gets indented by @emph{two}
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366 indents). Example:
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367
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368 @example
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369 @group
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370 if (have_args)
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371 @{
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372 idx.push_back (first_args);
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373 have_args = false;
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374 @}
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375 else
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376 idx.push_back (make_value_list (*p_args, *p_arg_nm, &tmp));
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377 @end group
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378 @end example
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379
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380 @noindent
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381 If you have nested @code{if} statements, use extra braces for extra
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382 clarification.
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383
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384 Split long expressions in such a way that a continuation line starts
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385 with an operator rather than identifier. If the split occurs inside
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386 braces, continuation should be aligned with the first char after the
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387 innermost braces enclosing the split. Example:
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388
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389 @example
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390 @group
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391 SVD::type type = ((nargout == 0 || nargout == 1)
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392 ? SVD::sigma_only
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393 : (nargin == 2) ? SVD::economy : SVD::std);
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394 @end group
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395 @end example
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396
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397 @noindent
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398 Consider putting extra braces around a multiline expression to make it
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399 more readable, even if they are not necessary. Also, do not hesitate to
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400 put extra braces anywhere if it improves clarity.
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401
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402 Declare variables just before they're needed. Use local variables of
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403 blocks---it helps optimization. Don't write multi-line variable
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404 declaration with a single type specification and multiple variables. If
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405 the variables don't fit on single line, repeat the type specification.
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406 Example:
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407
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408 @example
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409 @group
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410 octave_value retval;
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411
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412 octave_idx_type nr = b.rows ();
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413 octave_idx_type nc = b.cols ();
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414
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415 double d1, d2;
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416 @end group
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417 @end example
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418
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419 Use lowercase names if possible. Uppercase is acceptable for variable
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420 names consisting of 1-2 letters. Do not use mixed case names.
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421
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422 Use Octave's types and classes if possible. Otherwise, use the C++
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423 standard library. Use of STL containers and algorithms is encouraged.
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424 Use templates wisely to reduce code duplication. Avoid comma
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425 expressions, labels and gotos, and explicit typecasts. If you need to
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426 typecast, use the modern C++ casting operators. In functions, minimize
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427 the number of @code{return} statements---use nested @code{if} statements
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428 if possible.
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429
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430 @node Other Sources
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431 @section Other Sources
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432 Apart from C++ and Octave language (m-files), Octave's sources include
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433 files written in C, Fortran, M4, Perl, Unix shell, AWK, Texinfo, and
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434 @TeX{}. There are not many rules to follow when using these other
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435 languages; some of them are summarized below. In any case, the golden
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436 rule is: if you modify a source file, try to follow any conventions you
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437 can detect in the file or other similar files.
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438
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439 For C you should obviously follow all C++ rules that can apply.
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440
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441 If you modify a Fortran file, you should stay within Fortran 77 with
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442 common extensions like @code{END DO}. Currently, we want all sources to
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443 be compilable with the f2c and g77 compilers, without special flags if
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444 possible. This usually means that non-legacy compilers also accept the
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445 sources.
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446
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447 The M4 macro language is mainly used for Autoconf configuration files.
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448 You should follow normal M4 rules when contributing to these files.
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449 Some M4 files come from external source, namely the Autoconf archive
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450 @url{http://autoconf-archive.cryp.to}.
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451
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452 If you give a code example in the documentation written in Texinfo with
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453 the @code{@@example} environment, you should be aware that the text
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454 within such an environment will not be wrapped. It is recommended that
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455 you keep the lines short enough to fit on pages in the generated pdf or
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456 ps documents. Here is a ruler (in an @code{@@example} environment) for
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457 finding the appropriate line width:
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458
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459 @example
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460 @group
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461 1 2 3 4 5 6
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462 123456789012345678901234567890123456789012345678901234567890
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463 @end group
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464 @end example