Weather-0.1.0.4: dist/doc/html/Weather-0.1.0.3-docs/src/Net-Weather.html
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<title>src/Net/Weather.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE OverloadedStrings #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Net</span><span class='hs-varop'>.</span><span class='hs-conid'>Weather</span>
<a name="line-4"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Observation</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>APIKey</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>getConditions</span>
<a name="line-7"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Aeson</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-layout'>(</span><span class='hs-varid'>pack</span><span class='hs-layout'>)</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>HTTP</span> <span class='hs-layout'>(</span><span class='hs-varid'>getResponseBody</span><span class='hs-layout'>,</span> <span class='hs-varid'>simpleHTTP</span><span class='hs-layout'>,</span> <span class='hs-varid'>getRequest</span><span class='hs-layout'>)</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>HashMap</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>H</span>
<a name="line-18"></a>
<a name="line-19"></a><a name="Observation"></a><span class='hs-comment'>-- | Observation data.</span>
<a name="line-20"></a><a name="Observation"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Observation</span> <span class='hs-keyglyph'>=</span>
<a name="line-21"></a> <span class='hs-conid'>Observation</span> <span class='hs-layout'>{</span> <span class='hs-varid'>obsTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ The time the observation was taken.</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>obsWeather</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Description of the weather.</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>obsTemp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Temperature (F).</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>obsRelHumidity</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Relative humidity (%).</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>obsWind</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ Wind condition.</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>obsFeelsLike</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ What it feels like.</span>
<a name="line-27"></a> <span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="instance%20FromJSON%20Observation"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>FromJSON</span> <span class='hs-conid'>Observation</span> <span class='hs-keyword'>where</span>
<a name="line-30"></a> <span class='hs-varid'>parseJSON</span> <span class='hs-layout'>(</span><span class='hs-conid'>Object</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Observation</span>
<a name="line-31"></a> <span class='hs-varop'><$></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"observation_time"</span>
<a name="line-32"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"weather"</span>
<a name="line-33"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"temp_f"</span>
<a name="line-34"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"relative_humidity"</span>
<a name="line-35"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"wind_string"</span>
<a name="line-36"></a> <span class='hs-varop'><*></span> <span class='hs-varid'>v</span> <span class='hs-varop'>.:</span> <span class='hs-str'>"feelslike_string"</span>
<a name="line-37"></a> <span class='hs-varid'>parseJSON</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mzero</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="APIKey"></a><span class='hs-comment'>-- | API key. Obtain yours at <a href="http://wunderground.com.">http://wunderground.com.</a></span>
<a name="line-40"></a><a name="APIKey"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>APIKey</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="City"></a><span class='hs-comment'>-- | City name (e.g. Detroit).</span>
<a name="line-43"></a><a name="City"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>City</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="State"></a><span class='hs-comment'>-- | State abbreviation (e.g. MI for Michigan).</span>
<a name="line-46"></a><a name="State"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>State</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="getConditions"></a><span class='hs-comment'>-- | Get the current weather conditions of a city.</span>
<a name="line-49"></a><span class='hs-definition'>getConditions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>APIKey</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>City</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>State</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Observation</span><span class='hs-layout'>)</span>
<a name="line-50"></a><span class='hs-definition'>getConditions</span> <span class='hs-varid'>key</span> <span class='hs-varid'>city</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-51"></a> <span class='hs-varid'>obj</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>evalJSONRequest</span> <span class='hs-varop'>$</span> <span class='hs-varid'>conditionsQuery</span> <span class='hs-varid'>key</span> <span class='hs-varid'>city</span> <span class='hs-varid'>state</span>
<a name="line-52"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>obj</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>getProperty</span> <span class='hs-str'>"current_observation"</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="getProperty"></a><span class='hs-comment'>-- Fetch a property from a JSON object.</span>
<a name="line-55"></a><span class='hs-definition'>getProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FromJSON</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Value</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-56"></a><span class='hs-definition'>getProperty</span> <span class='hs-varid'>property</span> <span class='hs-layout'>(</span><span class='hs-conid'>Object</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-57"></a> <span class='hs-varid'>val</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>property</span> <span class='hs-varid'>v</span>
<a name="line-58"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromJSON</span> <span class='hs-varid'>val</span> <span class='hs-keyword'>of</span>
<a name="line-59"></a> <span class='hs-conid'>Error</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-60"></a> <span class='hs-conid'>Success</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-61"></a><span class='hs-definition'>getProperty</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="evalJSONRequest"></a><span class='hs-comment'>-- Evaluate a JSON request and return the parsed object.</span>
<a name="line-64"></a><span class='hs-definition'>evalJSONRequest</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FromJSON</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-definition'>evalJSONRequest</span> <span class='hs-varid'>request</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-66"></a> <span class='hs-varid'>body</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getResponseBody</span> <span class='hs-varop'><=<</span> <span class='hs-varid'>simpleHTTP</span> <span class='hs-varop'>$</span> <span class='hs-varid'>getRequest</span> <span class='hs-varid'>request</span>
<a name="line-67"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>decode</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pack</span> <span class='hs-varid'>body</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="conditionsQuery"></a><span class='hs-comment'>-- The query used to get weather conditions.</span>
<a name="line-70"></a><span class='hs-definition'>conditionsQuery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-71"></a><span class='hs-definition'>conditionsQuery</span> <span class='hs-varid'>key</span> <span class='hs-varid'>city</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span>
<a name="line-72"></a> <span class='hs-str'>"http://api.wunderground.com/api/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>key</span>
<a name="line-73"></a> <span class='hs-varop'>++</span> <span class='hs-str'>"/conditions/q/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>state</span>
<a name="line-74"></a> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>city</span> <span class='hs-varop'>++</span> <span class='hs-str'>".json"</span>
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