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serve: Make it possible to preview pages with a custom root URL.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 19 Dec 2015 18:06:16 -0800
parents 9b8b47fb1068
children
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1 ---
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2 title: Page Sources
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3 ---
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5 A page source is a component that retrieves pages from _somewhere_, and gives
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6 them to the rest of the application for processing. A typical blog would have 2
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7 sources: one for the blog posts, and one for the other pages (like the main
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8 page, an "_about_" page, some archives, etc.).
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9
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10 To provide new page sources, you need to override the `getSources` method of
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11 your plugin, and return source _types_ (not instances!).
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14 ```python
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15 class MyPlugin(PieCrustPlugin):
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16 name = 'myplugin'
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17
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18 def getSources(self):
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19 return [
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20 MyCustomSource]
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21 ```
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23
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24 ## Basic Implementation
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25
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26 To implement a page source, you need to inherit from the `PageSource` class:
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28 ```python
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29 from piecrust.sources.base import PageSource
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31 class MyCustomSource(PageSource):
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32 def __init__(self, app, name, config):
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33 super(MyCustomSource, self).__init__(app, name, config)
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34 # Other stuff...
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35
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36 ```
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37
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38 There are 3 methods you need to override for a basic, functioning page source.
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40 * `buildPageFactories(self)`: you should be returning a list of `PageFactory`
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41 objects here -- one for each page inside the given source. Your source
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42 instance has access to its configuration settings from the website's
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43 `config.yml`, and to the current `PieCrust` application, among other things.
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44 A `PageFactory` object describes how a page should be created. It has a
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45 `ref_path` (_i.e._ a source-specific path which, for a simple source, could
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46 just be the relative path of the page file inside the source's directory), and
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47 some `metadata`. See "_Source Metadata_" later on this page.
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49 * `resolveRef(self, ref_path)`: you should return a tuple that describes the
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50 page found at `ref_path`. The tuple contains the full path of the page file,
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51 and the _source metadata_ for it.
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53 * `findPageFactory(self, metadata, mode)`: this is mostly useful when running
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54 PieCrust as a dynamic CMS (which incidentally is also the case when previewing
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55 with `chef serve`). Based on the _route metadata_ provided, the source is
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56 expected to do its best to find a matching page, and return a `PageFactory`
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57 for it.
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59 The `mode` can either be `MODE_PARSING` or `MODE_CREATING`. The first mode
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60 expects you to return a `PageFactory` for an existing page. That's the mode
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61 that will always be given while running `chef serve`. The second mode expects
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62 you to return a factory for a _non-existing_ page. That's the mode that will
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63 be given when running `chef prepare`, _i.e._ when the application wants to
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64 create a new page for a source, and needs to know exactly what file to create.
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67 ## Source Metadata
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71 ## Mixins
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