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Make the tutorial to compile again

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- Remove generated documentation leaving only documentation sources.
- Add CI job checking that the tutorial is up to date.
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Eugen Wissner 2019-07-20 06:57:13 +02:00
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pandoc -f markdown+lhs+yaml_metadata_block --highlight-style=haddock -S -c "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" --section-divs -c tutorial.css --toc --standalone -t html5 -o tutorial.html tutorial.lhs
pandoc -f markdown+lhs+yaml_metadata_block --highlight-style=haddock --toc --standalone -t rst -o tutorial.rst tutorial.lhs
pandoc -f markdown+lhs+yaml_metadata_block --highlight-style=haddock --toc --standalone -t latex -o tutorial.pdf tutorial.lhs

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="generator" content="pandoc">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>GraphQL Haskell Tutorial</title>
<style type="text/css">code{white-space: pre;}</style>
<style type="text/css">
div.sourceCode { overflow-x: auto; }
table.sourceCode, tr.sourceCode, td.lineNumbers, td.sourceCode {
margin: 0; padding: 0; vertical-align: baseline; border: none; }
table.sourceCode { width: 100%; line-height: 100%; }
td.lineNumbers { text-align: right; padding-right: 4px; padding-left: 4px; color: #aaaaaa; border-right: 1px solid #aaaaaa; }
td.sourceCode { padding-left: 5px; }
code > span.kw { color: #0000ff; } /* Keyword */
code > span.ch { color: #008080; } /* Char */
code > span.st { color: #008080; } /* String */
code > span.co { color: #008000; } /* Comment */
code > span.ot { color: #ff4000; } /* Other */
code > span.al { color: #ff0000; } /* Alert */
code > span.er { color: #ff0000; font-weight: bold; } /* Error */
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code > span.vs { color: #008080; } /* VerbatimString */
code > span.ss { color: #008080; } /* SpecialString */
code > span.im { } /* Import */
code > span.va { } /* Variable */
code > span.cf { color: #0000ff; } /* ControlFlow */
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code > span.pp { color: #ff4000; } /* Preprocessor */
code > span.do { color: #008000; } /* Documentation */
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code > span.cv { color: #008000; } /* CommentVar */
code > span.at { } /* Attribute */
code > span.in { color: #008000; } /* Information */
</style>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="tutorial.css">
<!--[if lt IE 9]>
<script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv-printshiv.min.js"></script>
<![endif]-->
</head>
<body>
<header>
<h1 class="title">GraphQL Haskell Tutorial</h1>
</header>
<nav id="TOC">
<ul>
<li><a href="#getting-started">Getting started</a><ul>
<li><a href="#first-example">First example</a></li>
<li><a href="#monadic-actions">Monadic actions</a></li>
<li><a href="#errors">Errors</a></li>
<li><a href="#combining-resolvers">Combining resolvers</a></li>
</ul></li>
<li><a href="#further-examples">Further examples</a></li>
</ul>
</nav>
<section id="getting-started" class="level2">
<h2>Getting started</h2>
<p>Welcome to graphql-haskell!</p>
<p>We have written a small tutorial to help you (and ourselves) understand the graphql package.</p>
<p>Since this file is a literate haskell file, we start by importing some dependencies.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">{-# LANGUAGE OverloadedStrings #-}</span>
<span class="ot">{-# LANGUAGE LambdaCase #-}</span>
<span class="kw">module</span> <span class="dt">Main</span> <span class="kw">where</span>
<span class="kw">import </span><span class="dt">Prelude</span> <span class="kw">hiding</span> (empty, putStrLn)
<span class="kw">import </span><span class="dt">Data.GraphQL</span>
<span class="kw">import </span><span class="dt">Data.GraphQL.Schema</span>
<span class="kw">import qualified</span> <span class="dt">Data.GraphQL.Schema</span> <span class="kw">as</span> <span class="dt">Schema</span>
<span class="kw">import </span><span class="dt">Control.Applicative</span>
<span class="kw">import </span><span class="dt">Data.List.NonEmpty</span> (<span class="dt">NonEmpty</span>((:|)))
<span class="kw">import </span><span class="dt">Data.Text</span> <span class="kw">hiding</span> (empty)
<span class="kw">import </span><span class="dt">Data.Aeson</span>
<span class="kw">import </span><span class="dt">Data.ByteString.Lazy.Char8</span> (putStrLn)
<span class="kw">import </span><span class="dt">Data.Time</span>
<span class="kw">import </span><span class="dt">Debug.Trace</span></code></pre></div>
<section id="first-example" class="level3">
<h3>First example</h3>
<p>Now, as our first example, we are going to look at the example from <a href="https://github.com/graphql/graphql-js">graphql.js</a>.</p>
<p>First we build a GraphQL schema.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">schema1 ::</span> <span class="dt">Alternative</span> f <span class="ot">=&gt;</span> <span class="dt">Schema</span> f
schema1 <span class="fu">=</span> hello <span class="fu">:|</span> []
<span class="ot">hello ::</span> <span class="dt">Alternative</span> f <span class="ot">=&gt;</span> <span class="dt">Resolver</span> f
hello <span class="fu">=</span> Schema.scalar <span class="st">&quot;hello&quot;</span> (<span class="st">&quot;it&#39;s me&quot;</span><span class="ot"> ::</span> <span class="dt">Text</span>)</code></pre></div>
<p>This defines a simple schema with one type and one field, that resolves to a fixed value.</p>
<p>Next we define our query.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">query1 ::</span> <span class="dt">Text</span>
query1 <span class="fu">=</span> <span class="st">&quot;{ hello }&quot;</span></code></pre></div>
<p>To run the query, we call the <code>graphql</code> with the schema and the query.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">main1 ::</span> <span class="dt">IO</span> ()
main1 <span class="fu">=</span> putStrLn <span class="fu">=&lt;&lt;</span> encode <span class="fu">&lt;$&gt;</span> graphql schema1 query1</code></pre></div>
<p>This runs the query by fetching the one field defined, returning</p>
<p><code>{&quot;data&quot; : {&quot;hello&quot;:&quot;it's me&quot;}}</code></p>
</section>
<section id="monadic-actions" class="level3">
<h3>Monadic actions</h3>
<p>For this example, we’re going to be using time.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">schema2 ::</span> <span class="dt">Schema</span> <span class="dt">IO</span>
schema2 <span class="fu">=</span> time <span class="fu">:|</span> []
<span class="ot">time ::</span> <span class="dt">Resolver</span> <span class="dt">IO</span>
time <span class="fu">=</span> Schema.scalarA <span class="st">&quot;time&quot;</span> <span class="fu">$</span> \<span class="kw">case</span>
[] <span class="ot">-&gt;</span> <span class="kw">do</span> t <span class="ot">&lt;-</span> getCurrentTime
return <span class="fu">$</span> show t
_ <span class="ot">-&gt;</span> empty</code></pre></div>
<p>This defines a simple schema with one type and one field, which resolves to the current time.</p>
<p>Next we define our query.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">query2 ::</span> <span class="dt">Text</span>
query2 <span class="fu">=</span> <span class="st">&quot;{ time }&quot;</span>
<span class="ot">main2 ::</span> <span class="dt">IO</span> ()
main2 <span class="fu">=</span> putStrLn <span class="fu">=&lt;&lt;</span> encode <span class="fu">&lt;$&gt;</span> graphql schema2 query2</code></pre></div>
<p>This runs the query, returning the current time</p>
<p><code>{&quot;data&quot;: {&quot;time&quot;:&quot;2016-03-08 23:28:14.546899 UTC&quot;}}</code></p>
</section>
<section id="errors" class="level3">
<h3>Errors</h3>
<p>Errors are handled according to the spec, with fields that cause erros being resolved to <code>null</code>, and an error being added to the error list.</p>
<p>An example of this is the following query:</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">queryShouldFail ::</span> <span class="dt">Text</span>
queryShouldFail <span class="fu">=</span> <span class="st">&quot;{ boyhowdy }&quot;</span></code></pre></div>
<p>Since there is no <code>boyhowdy</code> field in our schema, it will not resolve, and the query will fail, as we can see in the following example.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">mainShouldFail ::</span> <span class="dt">IO</span> ()
mainShouldFail <span class="fu">=</span> <span class="kw">do</span>
r <span class="ot">&lt;-</span> graphql schema1 query1
putStrLn <span class="fu">$</span> encode r
putStrLn <span class="st">&quot;This will fail&quot;</span>
r <span class="ot">&lt;-</span> graphql schema1 queryShouldFail
putStrLn <span class="fu">$</span> encode r</code></pre></div>
<p>This outputs:</p>
<pre><code>{&quot;data&quot;: {&quot;hello&quot;: &quot;it&#39;s me&quot;}}
This will fail
{&quot;data&quot;: {&quot;boyhowdy&quot;: null}, &quot;errors&quot;:[{&quot;message&quot;: &quot;the field boyhowdy did not resolve.&quot;}]}</code></pre>
</section>
<section id="combining-resolvers" class="level3">
<h3>Combining resolvers</h3>
<p>Now that we have two resolvers, we can define a schema which uses them both.</p>
<div class="sourceCode"><pre class="sourceCode literate haskell"><code class="sourceCode haskell"><span class="ot">schema3 ::</span> <span class="dt">Schema</span> <span class="dt">IO</span>
schema3 <span class="fu">=</span> hello <span class="fu">:|</span> [time]
<span class="ot">query3 ::</span> <span class="dt">Text</span>
query3 <span class="fu">=</span> <span class="st">&quot;query timeAndHello { time hello }&quot;</span>
<span class="ot">main3 ::</span> <span class="dt">IO</span> ()
main3 <span class="fu">=</span> putStrLn <span class="fu">=&lt;&lt;</span> encode <span class="fu">&lt;$&gt;</span> graphql schema3 query3</code></pre></div>
<p>This queries for both time and hello, returning</p>
<p><code>{ &quot;data&quot;: {&quot;hello&quot;:&quot;it's me&quot;,&quot;time&quot;:&quot;2016-03-08 23:29:11.62108 UTC&quot;}}</code></p>
<p>Notice that we can name our queries, as we did with <code>timeAndHello</code>. Since we have only been using single queries, we can use the shorthand <code>{ time hello}</code>, as we have been doing in the previous examples.</p>
<p>In GraphQL there can only be one operation per query.</p>
</section>
</section>
<section id="further-examples" class="level2">
<h2>Further examples</h2>
<p>More examples on queries and a more complex schema can be found in the test directory, in the <a href="../../tests/Test/StarWars">Test.StarWars</a> module. This includes a more complex schema, and more complex queries.</p>
</section>
</body>
</html>

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@ -15,20 +15,20 @@ Since this file is a literate haskell file, we start by importing some dependenc
> {-# LANGUAGE LambdaCase #-} > {-# LANGUAGE LambdaCase #-}
> module Main where > module Main where
> >
> import Prelude hiding (empty, putStrLn) > import Control.Monad.IO.Class (liftIO)
> import Data.GraphQL > import Control.Monad.Trans.Except (throwE)
> import Data.GraphQL.Schema > import Data.Aeson (encode)
> import qualified Data.GraphQL.Schema as Schema
>
> import Control.Applicative
> import Data.List.NonEmpty (NonEmpty((:|)))
> import Data.Text hiding (empty)
> import Data.Aeson
> import Data.ByteString.Lazy.Char8 (putStrLn) > import Data.ByteString.Lazy.Char8 (putStrLn)
> import Data.List.NonEmpty (NonEmpty(..))
> import Data.Text (Text)
> import Data.Time (getCurrentTime)
> >
> import Data.Time > import Language.GraphQL
> import Language.GraphQL.Schema (Schema)
> import qualified Language.GraphQL.Schema as Schema
> import Language.GraphQL.Trans (ActionT(..))
> >
> import Debug.Trace > import Prelude hiding (putStrLn)
=== First example === === First example ===
@ -37,11 +37,11 @@ example from [graphql.js](https://github.com/graphql/graphql-js).
First we build a GraphQL schema. First we build a GraphQL schema.
> schema1 :: Alternative f => Schema f > schema1 :: Schema IO
> schema1 = hello :| [] > schema1 = hello :| []
> >
> hello :: Alternative f => Resolver f > hello :: Schema.Resolver IO
> hello = Schema.scalar "hello" ("it's me" :: Text) > hello = Schema.scalar "hello" (return ("it's me" :: Text))
This defines a simple schema with one type and one field, that resolves to a fixed value. This defines a simple schema with one type and one field, that resolves to a fixed value.
@ -70,11 +70,11 @@ For this example, we're going to be using time.
> schema2 :: Schema IO > schema2 :: Schema IO
> schema2 = time :| [] > schema2 = time :| []
> >
> time :: Resolver IO > time :: Schema.Resolver IO
> time = Schema.scalarA "time" $ \case > time = Schema.scalarA "time" $ \case
> [] -> do t <- getCurrentTime > [] -> do t <- liftIO getCurrentTime
> return $ show t > return $ show t
> _ -> empty > _ -> ActionT $ throwE "Invalid arguments."
This defines a simple schema with one type and one field, This defines a simple schema with one type and one field,
which resolves to the current time. which resolves to the current time.
@ -108,11 +108,11 @@ and the query will fail, as we can see in the following example.
> mainShouldFail :: IO () > mainShouldFail :: IO ()
> mainShouldFail = do > mainShouldFail = do
> r <- graphql schema1 query1 > success <- graphql schema1 query1
> putStrLn $ encode r > putStrLn $ encode success
> putStrLn "This will fail" > putStrLn "This will fail"
> r <- graphql schema1 queryShouldFail > failure <- graphql schema1 queryShouldFail
> putStrLn $ encode r > putStrLn $ encode failure
> >
This outputs: This outputs:
@ -149,3 +149,6 @@ In GraphQL there can only be one operation per query.
More examples on queries and a more complex schema can be found in the test directory, More examples on queries and a more complex schema can be found in the test directory,
in the [Test.StarWars](../../tests/Test/StarWars) module. This includes a more complex schema, and more complex queries. in the [Test.StarWars](../../tests/Test/StarWars) module. This includes a more complex schema, and more complex queries.
> main :: IO ()
> main = main1 >> main2 >> mainShouldFail >> main3

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========================
GraphQL Haskell Tutorial
========================
.. contents::
:depth: 3
..
Getting started
===============
Welcome to graphql-haskell!
We have written a small tutorial to help you (and ourselves) understand
the graphql package.
Since this file is a literate haskell file, we start by importing some
dependencies.
.. code:: haskell
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE LambdaCase #-}
module Main where
import Prelude hiding (empty, putStrLn)
import Data.GraphQL
import Data.GraphQL.Schema
import qualified Data.GraphQL.Schema as Schema
import Control.Applicative
import Data.List.NonEmpty (NonEmpty((:|)))
import Data.Text hiding (empty)
import Data.Aeson
import Data.ByteString.Lazy.Char8 (putStrLn)
import Data.Time
import Debug.Trace
First example
-------------
Now, as our first example, we are going to look at the example from
`graphql.js <https://github.com/graphql/graphql-js>`__.
First we build a GraphQL schema.
.. code:: haskell
schema1 :: Alternative f => Schema f
schema1 = hello :| []
hello :: Alternative f => Resolver f
hello = Schema.scalar "hello" ("it's me" :: Text)
This defines a simple schema with one type and one field, that resolves
to a fixed value.
Next we define our query.
.. code:: haskell
query1 :: Text
query1 = "{ hello }"
To run the query, we call the ``graphql`` with the schema and the query.
.. code:: haskell
main1 :: IO ()
main1 = putStrLn =<< encode <$> graphql schema1 query1
This runs the query by fetching the one field defined, returning
``{"data" : {"hello":"it's me"}}``
Monadic actions
---------------
For this example, we're going to be using time.
.. code:: haskell
schema2 :: Schema IO
schema2 = time :| []
time :: Resolver IO
time = Schema.scalarA "time" $ \case
[] -> do t <- getCurrentTime
return $ show t
_ -> empty
This defines a simple schema with one type and one field, which resolves
to the current time.
Next we define our query.
.. code:: haskell
query2 :: Text
query2 = "{ time }"
main2 :: IO ()
main2 = putStrLn =<< encode <$> graphql schema2 query2
This runs the query, returning the current time
``{"data": {"time":"2016-03-08 23:28:14.546899 UTC"}}``
Errors
------
Errors are handled according to the spec, with fields that cause erros
being resolved to ``null``, and an error being added to the error list.
An example of this is the following query:
.. code:: haskell
queryShouldFail :: Text
queryShouldFail = "{ boyhowdy }"
Since there is no ``boyhowdy`` field in our schema, it will not resolve,
and the query will fail, as we can see in the following example.
.. code:: haskell
mainShouldFail :: IO ()
mainShouldFail = do
r <- graphql schema1 query1
putStrLn $ encode r
putStrLn "This will fail"
r <- graphql schema1 queryShouldFail
putStrLn $ encode r
This outputs:
::
{"data": {"hello": "it's me"}}
This will fail
{"data": {"boyhowdy": null}, "errors":[{"message": "the field boyhowdy did not resolve."}]}
Combining resolvers
-------------------
Now that we have two resolvers, we can define a schema which uses them
both.
.. code:: haskell
schema3 :: Schema IO
schema3 = hello :| [time]
query3 :: Text
query3 = "query timeAndHello { time hello }"
main3 :: IO ()
main3 = putStrLn =<< encode <$> graphql schema3 query3
This queries for both time and hello, returning
``{ "data": {"hello":"it's me","time":"2016-03-08 23:29:11.62108 UTC"}}``
Notice that we can name our queries, as we did with ``timeAndHello``.
Since we have only been using single queries, we can use the shorthand
``{ time hello}``, as we have been doing in the previous examples.
In GraphQL there can only be one operation per query.
Further examples
================
More examples on queries and a more complex schema can be found in the
test directory, in the `Test.StarWars <../../tests/Test/StarWars>`__
module. This includes a more complex schema, and more complex queries.

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$STACK --no-terminal test --pedantic $STACK --no-terminal test --pedantic
} }
test_docs() {
$STACK --no-terminal ghc -- -Wall -fno-code docs/tutorial/tutorial.lhs
}
setup_lint() { setup_lint() {
$STACK --no-terminal install hlint $STACK --no-terminal install hlint
} }

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resolver: lts-13.28 resolver: lts-13.29
packages: packages:
- '.' - '.'
extra-deps: [] extra-deps: []

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@ -7,6 +7,6 @@ packages: []
snapshots: snapshots:
- completed: - completed:
size: 500539 size: 500539
url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/13/28.yaml url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/13/29.yaml
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original: lts-13.28 original: lts-13.29