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86 lines
3.6 KiB
Python
86 lines
3.6 KiB
Python
#
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# Copyright (c) 2009-2015 Tom Keffer <tkeffer@gmail.com>
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#
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# See the file LICENSE.txt for your full rights.
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#
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"""Example of how to extend the search list used by the Cheetah generator.
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This search list extension offers two extra tags:
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'alltime': All time statistics.
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For example, "what is the all time high temperature?"
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'seven_day': Statistics for the last seven days.
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That is, since midnight seven days ago.
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To use it, modify the option search_list in your skin.conf configuration file,
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adding the name of this extension. For this example, the name of the extension
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is examples.xsearch.MyXSearch. So, when you're done, it will look something
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like this:
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[CheetahGenerator]
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search_list_extensions = examples.xsearch.MyXSearch
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Note that if your file skin.conf is from an older version of Weewx, this
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section may be named [FileGenerator]. It will work just fine.
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You can then use tags such as $alltime.outTemp.max for the all-time max
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temperature, or $seven_day.rain.sum for the total rainfall in the last
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seven days.
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"""
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import datetime
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import time
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from weewx.cheetahgenerator import SearchList
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from weewx.tags import TimespanBinder
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from weeutil.weeutil import TimeSpan
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class MyXSearch(SearchList): # 1
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"""My search list extension"""
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def __init__(self, generator): # 2
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SearchList.__init__(self, generator)
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def get_extension_list(self, timespan, db_lookup): # 3
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"""Returns a search list extension with two additions.
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Parameters:
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timespan: An instance of weeutil.weeutil.TimeSpan. This will
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hold the start and stop times of the domain of
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valid times.
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db_lookup: This is a function that, given a data binding
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as its only parameter, will return a database manager
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object.
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"""
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# First, create TimespanBinder object for all time. This one is easy
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# because the object timespan already holds all valid times to be
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# used in the report.
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all_stats = TimespanBinder(timespan,
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db_lookup,
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formatter=self.generator.formatter,
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converter=self.generator.converter) # 4
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# Now get a TimespanBinder object for the last seven days. This one we
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# will have to calculate. First, calculate the time at midnight, seven
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# days ago. The variable week_dt will be an instance of datetime.date.
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week_dt = datetime.date.fromtimestamp(timespan.stop) - \
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datetime.timedelta(weeks=1) # 5
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# Convert it to unix epoch time:
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week_ts = time.mktime(week_dt.timetuple()) # 6
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# Form a TimespanBinder object, using the time span we just
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# calculated:
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seven_day_stats = TimespanBinder(TimeSpan(week_ts, timespan.stop),
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db_lookup,
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formatter=self.generator.formatter,
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converter=self.generator.converter) # 7
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# Now create a small dictionary with keys 'alltime' and 'seven_day':
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search_list_extension = {'alltime' : all_stats,
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'seven_day' : seven_day_stats} # 8
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# Finally, return our extension as a list:
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return [search_list_extension] # 9
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