annotate roadmap.txt @ 6:3198742f7a86

notes to self
author k0s <k0scist@gmail.com>
date Mon, 05 Oct 2009 09:20:02 -0400
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1 bitsyblog, middleware, and the roadmap to the future
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2
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3 the nice thing with working like software like bitsyblog is that the
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4 intent of the software is clear. bitsyblog aims to provide a solution
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5 for users to keep a log of their activities on the web. When thinking of
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6 software in terms of the narrow intent of a component, it becomes much
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7 easier to divine what sort of framework would look like around it and
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8 how this framework might be applicable to other types of software.
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9
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10 Firstly, I noticed that the bitsyblog component app is not as small as
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11 it could be. bitsyblog provides a multi-user solution to (personal)
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12 blogging. This level of solution should exist, but thinking in terms
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13 of components it is easy to see that users may want a personal blog
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14 that is not multi-user. lammy wants a blog on his desktop computer.
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15 When at his computer, he probably wants to be logged in all the time
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16 (always accept connections from 127.0.0.1). He doesn't want other
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17 people to be able to make a blog there. When not at his desktop, he
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18 wants to be able to login and post through the web and maybe used the
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19 blogme.py script too. In bitsyblog terms, '/lammy'
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20 becomes '/' and all urls ('preferences', 'post', 'css/') become
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21 relative to this. Doing this involves separating out the individual
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22 blog components from the multi-user component and probably having
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23 different .ini files from which to run paste.
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24
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25 I've also realized that the way I handle CSS is a solution to a
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26 problem that has nothing to do with bitsyblog. The other items in
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27 preferences ('date', 'subject', but not 'friends' which has to do with
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28 roles) are about formatting the blog posts. The CSS is about themeing
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29 pages which has nothing to do with blog posts. So what is needed is a
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30 CSS component, which is possibly linked to from the preferences page.
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31 Lets put this at '/lammy/css'. This pages may have the fields for
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32 preferences, but also provides an interface for managing the CSS. A
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33 user may want to delete CSS or edit them, render the current page with
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34 a selected stylesheet or what's in the editor, or render an arbitrary web page
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35 This is like CSS zen garden, but more interactive, and
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36 (optionally) allowing the user to save the CSS and apply it to their
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37 pages. I can also imagine, in a 2.0 version, an implementation that
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38 allows permits transforming of CSS to suitable to theming a page with
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39 a stylesheet intended for another page. One has a stylesheet with a
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40 bunch of rules. Using javascript, one mouses over the DOM of the
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41 other page. The rules are modified in order to applied to the
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42 appropriate container on the page. This sounds much like what
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43 deliverance is supposed to do, and maybe it could be utilized for this
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44 intent, though perhaps the intents are different and its better not to
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45 use it (to be investigated).
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46
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47 Both of the above components fall into a general pattern: there is a
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48 component which is the multi-user blog manager. Lets call this
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49 bitsyblog. There are microcomponents, the single-user blog (lets call
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50 this microblog) and the CSS zen garden component which lets you play
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51 with stylesheets (I dub thee samadhi). microblog and samadhi can live
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52 on their own, in which case they live at '/', or they might be managed
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53 by an external component -- microblog by bitsyblog, or samadhi
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54 by...not really sure, either a microblog instance or bitsyblog. In
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55 the latter case, they need to know where they live. I'm not sure what
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56 provides the rewrite rule telling them where they live. Ian? Ethan?
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57 There are a few configuration type details -- like auth, whether
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58 samadhi needs to know about where to put these CSS files or how
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59 bitsyusers can fetch them, but essentially if you give these the
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60 appropriate path, they should be able to work relatively
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61 independently.
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62
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63 In a different class of components are comments and tagging. While it
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64 is easy to imagine bitsyblog managing comments and tags, it is also
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65 fairly easy to see that these services really don't need to know what
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66 is being commented or tagged on. For commenting, I imagine an app
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67 similar to smokesignals, but with a different persistence model. Lets
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68 call it commentator. Commentator is a javascript app with no
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69 intrinsic URLs. Given a set of rules (for instance, "allow commenting
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70 on <div>s with an id attribute) a block of text is shown as the last child
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71 of each <div> (or conditionally on mouseover). This will initially
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72 say something like "No comments | Add a comment" where each of these
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73 do what you think ('N comments' displays the comments, 'Add a comment'
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74 gives a textarea where you can say your mind). When a comment is
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75 added, it is put in a database (presumedly SQL, though really on a
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76 super-simple db is necessary) with the URL and/or id
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77 as its key. When the page is loaded, the text of the page is examined
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78 on response and the appropriate comments are displayed. It is also
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79 necessary to have some sort of mapping optionally between URL and id
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80 to another URI, as blog posts both are displayed as part of the user's
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81 entire blog and also have a unique URL. Notice that nothing here is
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82 particularly unique to blogs. Commenting on <div>s or <p>s in a wiki
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83 page is essentially the same (though in this case, it might be better
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84 to comment on the entire page, as these may not have ids and the page
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85 can be editted all willy-nilly like that. Commenting on individual
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86 <p>s and <div>s is, however, a really nice thing to have, so in a 2.0
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87 type incarnation of commentator, this should be added regardless of
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88 the difficulty). If bitsyblog was part of a
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89 site with a wiki, then commentator could deal with them both nicely.
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90 Optionally, one might specify the rule that if an item had comments,
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91 it either could not be deleted or that an alert would pop up before
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92 deletion with [Confirm] and [Cancel] buttons. This is easy to do if a
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93 browser could do a DELETE request and things behaved all RESTful.
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94 Otherwise, this would also be a non-trivial problem.
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95
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96 Tagging is very similar to commentator, though it might have a few
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97 intrinsic URLs too. You specify a similar set of rules concerning
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98 what can be tagged ("all <div>s with ids in /%(user)s/ and
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99 /%(user)s/200*") and a method pointing the ids to URLs. Then you have
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100 a database, which again is pretty simple and again in its simplest
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101 form could be a dictionary. Though here, the tags are the keys and
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102 the URLs are the values. You could also record number of tags per
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103 item, specify whether non-authenticated members can tag, etc. As the
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104 first or last child of each (say) <div>, you have what it has been
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105 tagged with, maybe weighted by how many times it has been tagged. You
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106 have a URL for searching by tags, maybe on a per-path basis ("I want
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107 to see all the tags under /k0s that have been tagged with 'cats' and
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108 'cute'"). You could also have a URL for the tag cloud. Again, what
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109 is being tagged is pretty divorced from the tagging component itself
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110 (lets call it tagit, unless that name is taken).
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111
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112 I have presented samadhi as being managed by bitsyblog or microblog
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113 and commentator and tagit living outside of bitsyblog in the
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114 middleware stack. I've done this because this "feels right" to me
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115 right now, though I reseve my right to change my mind about it. The
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116 thing I want emphasize is the difference in the two approaches:
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117
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118 * When a WSGI app is "managed" by another component app, the manager
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119 has to know about the managed app and dispatch the appropriate
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120 information (request, etc) to it, though in doing so it has the
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121 opportunity to have more control over the URL structure and what the
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122 component app does. It is also easier to return HTML this way.
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123
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124 * When a WSGI "app" is used as middleware and needs to markup the
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125 returned page in HTML, this is conducive to using javascript in
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126 order to insert nodes into the DOM dynamically, presumedly based on
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127 some rule set. Alternatively, the middleware may decompose the page
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128 with lxml and insert HTML where it needs to go that way. In this
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129 approach, the middleware need not have a URL (this may be
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130 preferable).
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131
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132 It is not necessarily clear to me at this time which approach is
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133 better for different apps. I have put commenting and tagging in the
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134 latter category because commenting and tagging on web pages seems
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135 divorced (save by a rule set) from what is being commented on or
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136 tagged. I have put microblog in the first category because it is
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137 clearly in the same layer of software as bitsyblog, and some
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138 management tasks will be necessary even for microblog. samadhi I put
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139 in the first category as well (though I hesistate right now) because
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140 otherwise the rewriting of URLs makes me nervous. Perhaps there is
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141 need of a WSGI dispatcher that fetches apps based on some sort of rule
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142 concerning the URL? Also, it seems
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143 necessary to put the CSS on user data. This could also be
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144 accomplished the other way: 1. abstract out members and roles
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145 (teamroler?) and store the data (CSS, etc) on them here; 2. have
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146 samadhi write a defined set of urls (how defined? not sure) including
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147 the stylesheets that it knows about, presumedly putting the 'foo'
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148 stylesheet at '/lammy/css/foo.css'. This still involves samadhi
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149 knowing something about the url structure, and now it is dependent on
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150 the user/role thing, though this could be a configuration option.
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151
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152 This is the middleware story. Other things could also be done
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153 internally to bitsyblog and its supporting software to make the
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154 experience more seamless.
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155
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156 I am bothered by the fact that the logic supporting the form and user
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157 settings is somewhat divorced. Ideally, rendering the form should do
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158 all the validation and return the settings in a sensible way to use.
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159 I don't think this is hard -- the settings.py should just be
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160 incorporated into markup.form. This goes some ways to reinventing
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161 things like formencode and zope.schema, so if we can get these to do
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162 what we want, maybe we shouldn't write our own. But at cursory
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163 glance, formencode won't and zope.schema isn't easily usable outside
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164 of zope. So maybe rolling our own isn't bad.
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165
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166 There's more middleware, but its hidden and is a bad coupling (that
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167 is, the app will depend on the middleware unless its done cleverly).
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168 The site nav does not appear on '/login' or '/join' (or any url not
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169 specified internally to bitsyblog, for that matter). It would be
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170 conceivable to have a SiteNav middleware that (either through
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171 javascript or lxml decomposition) writes the site nav at the top of
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172 the screen. bistyblog and bitsyauth would have to know about this
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173 though, so that they could add the relevent links into environ. Maybe
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174 this isn't horrible, but it seems so. Likewise, the site css doesn't
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175 show up here. Should it? Is this another piece of middleware or part
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176 of samadhi?
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177
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178 An important piece of middleware should involve members and roles. I
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179 really don't want to write this one, but I would like to consume it.
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180 It should live just inside of bitsyauth and make the users.py file
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181 unnecessary. It might be better to sit on this one until last.
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182
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183 So should be bitsyblog 2.0.
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184 There are a few other streamlining things (see the TODO.txt), but if
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185 all of this was implemented, bitsyblog would be a rich web experience
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186 that was highly componentized with each of the components doing one
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187 thing well. Moreso, since coupling is avoided, save through
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188 configuration, auth, and other loose links, each of these components
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189 could be used independently of bitsyblog or turned off without
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190 undesirable consequences.
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191
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192 At least as much as being a good blogging app, bitsyblog is about
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193 elegant design and component architecture. This roadmap shows what is
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194 possible in terms of having a fully functional blogging application
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195 with middleware that can be used outside of just bitsyblog. To take
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196 the other end of the spectrum, wordpress says "Hey, write plugins that
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197 will make me work better." As a programmer, I really hate this
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198 approach. If I write a commenting plugin for wordpress, then I have
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199 just that. If I want to use it to comment on a wiki page, I'm out of
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200 luck. If I write commenting middleware, then it can be used for any
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k0s <k0scist@gmail.com>
parents:
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201 WSGI app with minimal configuration. As a programmer, I generally
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k0s <k0scist@gmail.com>
parents:
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202 want the freedom to assemble a webapp however I want. With this
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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203 freedom comes some work, but for me its a worthy sacrifice. As a web
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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204 consumer, I understand that site administrators want out of the box
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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205 solutions. bitsyblog will offer this too. The default deployment of
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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206 bitsyblog will pull down commentator, samadhi, and tagit and have an
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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207 .ini file pointing to the appropriate factory to create the chain of
e3823be6a423 initial commit of bitsyblog, from https://svn.openplans.org/svn/standalone/bitsyblog/trunk/
k0s <k0scist@gmail.com>
parents:
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208 middleware to have all of these pieces in place. There is no contradiction.