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1593 lines
47 KiB
Elm
1593 lines
47 KiB
Elm
{- Copied from https://github.com/matheus23/elm-markdown-transforms/blob/02fddd3bf9e82412eb289bead3b5124a98163ab6/src/Markdown/Scaffolded.elm
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Modified to use BackendTask instead of StaticHttp
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-}
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module Markdown.Scaffolded exposing
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( Block(..)
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, map, indexedMap
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, parameterized, validating, withBackendTask
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, reduceHtml, reduceWords, reducePretty, reduce
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, foldFunction, foldResults, foldStaticHttpRequests, foldIndexed
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, fromRenderer, toRenderer
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, bumpHeadings
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)
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{-|
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# Rendering Markdown with Scaffolds, Reducers and Folds
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(This is called recursion-schemes in other languages, but don't worry, you don't have to
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write recursive functions (this is the point of all of this ;) )!)
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This is module provides a more **complicated**, but also **more powerful and
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composable** way of rendering markdown than the built-in elm-markdown
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[`Renderer`](https://package.elm-lang.org/packages/dillonkearns/elm-markdown/latest/Markdown-Renderer).
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If you feel a little overwhelmed with this module at first, I recommend taking a look at
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the [What are reducers?](#what-are-reducers-) section.
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# Main Datastructure
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@docs Block
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@docs map, indexedMap
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# High-level Transformations
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These functions are not as composable as [transformation building blocks](#transformation-building-blocks),
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but might suffice for your use case. Take a look at the other section if you find you need
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something better.
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@docs parameterized, validating, withBackendTask
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# Transformation Building Blocks
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@docs reduceHtml, reduceWords, reducePretty, reduce
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@docs foldFunction, foldResults, foldStaticHttpRequests, foldIndexed
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### What are 'reducers'?
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In this context of the library, we're often working with functions of the type
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`Block view -> view`, where `view` might be something like `Html Msg` or `String`, etc.
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or, generally, functions of structure `Block a -> b`.
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I refer to functions of that structure as 'reducers'. (This is somewhat different to the
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'real' terminology, but I feel like they capture the nature of 'reducing once' very well.)
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If you know `List.foldr` you already know an example for a reducer (the first argument)!
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The reducers in this module are no different, we just write them in different ways.
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We can do the same thing we did for this library for lists:
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type ListScaffold elem a
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= Empty
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| Cons elem a
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reduceEmpty = 0
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reduceCons a b = a + b
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handler listElement =
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case listElement of
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Empty ->
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reduceEmpty
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Cons elem accumulated ->
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reduceCons elem accumulated
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foldl : (ListScaffold a b -> b) -> List a -> b
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foldl handle list =
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case list of
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[] -> handle Empty
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(x:xs) -> handle (Cons x xs)
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foldl handler == List.foldl reduceCons reduceEmpty
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The last line illustrates how different ways of writing these reducers relate: For
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`List.foldl` we simply provide the cases (empty or cons) as different arguments,
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for reducers in this library, we create a custom type case for empty and cons.
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### What are 'folds'?
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Some functions have similar, but not quite the type that a reducers has. For example:
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- `Block (Request a) -> Request (Block a)`
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- `Block (Maybe a) -> Maybe (Block a)`
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- `Block (Result err a) -> Result err (Block a)`
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- `Block (environment -> a) -> environment -> Block a`
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All of these examples have the structure `Block (F a) -> F (Block a)` for some `F`. You
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might have to squint your eyes at the last two of these examples. Especially the last one.
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Let me rewrite it with a type alias:
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type alias Function a b =
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a -> b
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foldFunction : Block (Function env a) -> Function env (Block a)
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### Combining Reducers
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You can combine multiple 'reducers' into one. There's no function for doing this, but a
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pattern you might want to follow.
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Let's say you want to accumulate both all the words in your markdown and the `Html` you
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want it to render to, then you can do this:
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type alias Rendered =
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{ html : Html Msg
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, words : List String
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}
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reduceRendered : Block Rendered -> Rendered
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reduceRendered block =
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{ html = block |> map .html |> reduceHtml
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, words = block |> map .words |> reduceWords
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}
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If you want to render to more things, just add another parameter to the record type and
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follow the pattern. It is even possible to let the rendered html to depend on the words
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inside itself (or maybe something else you're additionally reducing to).
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# Conversions
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Did you already start to write a custom elm-markdown `Renderer`, but want to use this
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library? Don't worry. They're compatible. You can convert between them!
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@docs fromRenderer, toRenderer
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# Utilities
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I mean to aggregate utilites for transforming Blocks in this section.
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@docs bumpHeadings
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-}
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import BackendTask exposing (BackendTask)
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import Html exposing (Html)
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import Html.Attributes as Attr
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import Markdown.Block as Block
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import Markdown.Html
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import Markdown.Renderer exposing (Renderer)
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import Regex
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import Result.Extra as Result
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-- EXPOSED DEFINITIONS
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{-| A datatype that enumerates all possible ways markdown could wrap some children.
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Kind of like a 'Scaffold' around something that's already built, which will get torn down
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after building is finished.
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This does not include Html tags.
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If you look at the left hand sides of all of the functions in the elm-markdown
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[`Renderer`](https://package.elm-lang.org/packages/dillonkearns/elm-markdown/latest/Markdown-Renderer),
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you'll notice a similarity to this custom type, except it's missing a type for 'html'.
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Defining this data structure has some advantages in composing multiple Renderers.
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It has a type parameter `children`, which is supposed to be filled with `String`,
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`Html msg` or similar. Take a look at some [reducers](#transformation-building-blocks) for examples of this.
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There are some neat tricks you can do with this data structure, for example, `Block Never`
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represents only non-nested blocks of markdown.
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-}
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type Block children
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= Heading { level : Block.HeadingLevel, rawText : String, children : List children }
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| Paragraph (List children)
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| BlockQuote (List children)
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| Text String
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| CodeSpan String
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| Strong (List children)
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| Emphasis (List children)
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| Strikethrough (List children)
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| Link { title : Maybe String, destination : String, children : List children }
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| Image { alt : String, src : String, title : Maybe String }
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| UnorderedList { items : List (Block.ListItem children) }
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| OrderedList { startingIndex : Int, items : List (List children) }
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| CodeBlock { body : String, language : Maybe String }
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| HardLineBreak
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| ThematicBreak
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| Table (List children)
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| TableHeader (List children)
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| TableBody (List children)
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| TableRow (List children)
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| TableCell (Maybe Block.Alignment) (List children)
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| TableHeaderCell (Maybe Block.Alignment) (List children)
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{-| Transform each child of a `Block` using the given function.
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For example, we can transform the lists of words inside each block into concatenated
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Strings:
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wordsToWordlist : Block (List String) -> Block String
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wordsToWordlist block =
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map (\listOfWords -> String.join ", " listOfWords)
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block
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Paragraph
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[ [ "This", "paragraph", "was", "full", "of", "individual", "words", "once." ]
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, [ "It", "also", "contained", "another", "paragraph" ]
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]
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|> wordsToWordlist
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--> Paragraph
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--> [ "This, paragraph, was, full, of, individual, words, once."
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--> , "It, also, contained, another, paragraph"
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--> ]
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HardLineBreak |> wordsToWordlist
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--> HardLineBreak
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The ability to define this function is one of the reasons for our `Block` definition. If
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you try defining `map` for elm-markdown's `Renderer` you'll find out it doesn't work.
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-}
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map : (a -> b) -> Block a -> Block b
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map f markdown =
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case markdown of
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Heading { level, rawText, children } ->
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Heading { level = level, rawText = rawText, children = List.map f children }
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Paragraph children ->
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Paragraph (List.map f children)
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BlockQuote children ->
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BlockQuote (List.map f children)
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Text content ->
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Text content
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CodeSpan content ->
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CodeSpan content
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Strong children ->
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Strong (List.map f children)
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Emphasis children ->
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Emphasis (List.map f children)
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Strikethrough children ->
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Strikethrough (List.map f children)
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Link { title, destination, children } ->
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Link { title = title, destination = destination, children = List.map f children }
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Image imageInfo ->
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Image imageInfo
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UnorderedList { items } ->
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UnorderedList
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{ items =
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List.map
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(\(Block.ListItem task children) ->
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Block.ListItem task (List.map f children)
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)
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items
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}
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OrderedList { startingIndex, items } ->
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OrderedList { startingIndex = startingIndex, items = List.map (List.map f) items }
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CodeBlock codeBlockInfo ->
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CodeBlock codeBlockInfo
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HardLineBreak ->
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HardLineBreak
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ThematicBreak ->
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ThematicBreak
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Table children ->
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Table (List.map f children)
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TableHeader children ->
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TableHeader (List.map f children)
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TableBody children ->
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TableBody (List.map f children)
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TableRow children ->
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TableRow (List.map f children)
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TableCell alignment children ->
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TableCell alignment (List.map f children)
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TableHeaderCell alignment children ->
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TableHeaderCell alignment (List.map f children)
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{-| Block's children are mapped from 0 to n (if n+1 is the amount of children).
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Most arguments to the mapping function are therefore [0], [1], ... etc.
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All children will get unique `List Int` arguments.
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In some cases like lists, there might be two levels of indices: [0,0], or [1,0].
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In these cases, the first integer is the 'closest' index from the point of view of the
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child.
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OrderedList
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{ startingIndex = 0
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, items =
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[ [ (), () ]
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, [ (), (), () ]
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]
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}
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|> indexedMap (\indices _ -> indices)
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--> OrderedList
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--> { startingIndex = 0
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--> , items =
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--> [ [ [ 0, 0 ], [ 1, 0 ] ]
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--> , [ [ 0, 1 ], [ 1, 1 ], [ 2, 1 ] ]
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--> ]
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--> }
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-}
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indexedMap : (List Int -> a -> b) -> Block a -> Block b
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indexedMap f markdown =
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case markdown of
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Heading { level, rawText, children } ->
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Heading { level = level, rawText = rawText, children = List.indexedMap (\index -> f [ index ]) children }
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Paragraph children ->
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Paragraph (List.indexedMap (\index -> f [ index ]) children)
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BlockQuote children ->
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BlockQuote (List.indexedMap (\index -> f [ index ]) children)
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Text content ->
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Text content
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CodeSpan content ->
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CodeSpan content
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Strong children ->
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Strong (List.indexedMap (\index -> f [ index ]) children)
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Emphasis children ->
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Emphasis (List.indexedMap (\index -> f [ index ]) children)
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Strikethrough children ->
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Strikethrough (List.indexedMap (\index -> f [ index ]) children)
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Link { title, destination, children } ->
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Link { title = title, destination = destination, children = List.indexedMap (\index -> f [ index ]) children }
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Image imageInfo ->
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Image imageInfo
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UnorderedList { items } ->
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UnorderedList
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{ items =
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List.indexedMap
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(\indexA (Block.ListItem task children) ->
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Block.ListItem task (List.indexedMap (\indexB -> f [ indexB, indexA ]) children)
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)
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items
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}
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OrderedList { startingIndex, items } ->
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OrderedList { startingIndex = startingIndex, items = List.indexedMap (\indexA -> List.indexedMap (\indexB -> f [ indexB, indexA ])) items }
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CodeBlock codeBlockInfo ->
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CodeBlock codeBlockInfo
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HardLineBreak ->
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HardLineBreak
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ThematicBreak ->
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ThematicBreak
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Table children ->
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Table (List.indexedMap (\index -> f [ index ]) children)
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TableHeader children ->
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TableHeader (List.indexedMap (\index -> f [ index ]) children)
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TableBody children ->
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TableBody (List.indexedMap (\index -> f [ index ]) children)
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TableRow children ->
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TableRow (List.indexedMap (\index -> f [ index ]) children)
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TableCell alignment children ->
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TableCell alignment (List.indexedMap (\index -> f [ index ]) children)
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TableHeaderCell alignment children ->
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TableHeaderCell alignment (List.indexedMap (\index -> f [ index ]) children)
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{-| Use this function if you want to parameterize your view by an environment.
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Another way of thinking about this use-case is: use this if you want to 'render to
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functions'.
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Examples for what the `environment` type variable can be:
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- A `Model`, for rendering to `Model -> Html Msg` for `view`.
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- Templating information, in case you want to use markdown as templates and want to
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render to a function that expects templating parameters.
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Usually, for the above usecases you would have to define a function of type
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reduceTemplate :
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Block (TemplateInfo -> Html msg)
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-> (TemplateInfo -> Html msg)
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for example, so that you can turn it back into a `Renderer (Template Info -> Html msg)`
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for elm-markdown.
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If you were to define such a function, you would have to pass around the `TemplateInfo`
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parameter a lot. This function will take care of that for you.
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### Anti use-cases
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In some cases using this function would be overkill. The alternative to this function is
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to simply parameterize your whole renderer (and not use this library):
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renderMarkdown : List String -> Block (Html Msg) -> Html Msg
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renderMarkdown censoredWords markdown =
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...
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renderer : List String -> Markdown.Renderer (Html Msg)
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renderer censoredWords =
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toRenderer
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{ renderHtml = ...
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, renderMarkdown = renderMarkdown censoredWords
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}
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In this example you can see how we pass through the 'censored words'. It behaves kind of
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like some global context in which we create our renderer.
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It is hard to convey the abstract notion of when to use `parameterized` and when not to.
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I'll give it a try: If you want to parse your markdown once and need to quickly render
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different versions of it (for example with different `Model`s or different
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`TemplateInfo`s), then use this. In other cases, if you probably only want to de-couple
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some variable out of your renderer that is pretty static in general (for example censored
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words), don't use this.
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### `parameterized` over multiple Parameters
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If you want to parameterize your renderer over multiple variables, there are two options:
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1. Add a field to the `environment` type used in this function
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2. Take another parameter in curried form
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Although both are possible, I highly recommend the first option, as it is by far easier
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to deal with only one call to `parameterized`, not with two calls that would be required
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for option 2.
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### Missing Functionality
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If this function doesn't quite do what you want, just try to re-create what you need by
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using `map` directly. `parameterized` basically just documents a pattern that is really
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easy to re-create: Its implementation is just 1 line of code.
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-}
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parameterized :
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(Block view -> environment -> view)
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-> (Block (environment -> view) -> (environment -> view))
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parameterized reducer markdown env =
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reducer (map (\expectingEnv -> expectingEnv env) markdown) env
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{-| This transform enables validating the content of your `Block` before
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rendering.
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This function's most prominent usecases are linting markdown files, so for example:
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- Make sure all your code snippets are specified only with valid languages
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('elm', 'javascript', 'js', 'html' etc.)
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- Make sure all your links are `https://` links
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- Generate errors/warnings on typos or words not contained in a dictionary
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- Disallow `h1` (alternatively, consider bumping the heading level)
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But it might also be possible that your `view` type can't _always_ be reduced from a
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`Block view` to a `view`, so you need to generate an error in these cases.
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### Missing Functionality
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If this function doesn't quite do what you need to do, try using `foldResults`.
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The `validating` definition basically just documents a common pattern. Its implementation
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is just 1 line of code.
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-}
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validating :
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(Block view -> Result error view)
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-> (Block (Result error view) -> Result error view)
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validating reducer markdown =
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markdown |> foldResults |> Result.andThen reducer
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{-| This transform allows you to perform elm-pages' BackendTask requests without having to
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think about how to thread these through your renderer.
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Some applications that can be realized like this:
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- Verifying that all links in your markdown do resolve at page build-time
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(Note: This currently needs some change in elm-pages, so it's not possible _yet_)
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- Giving custom elm-markdown HTML elements the ability to perform BackendTask requests
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### Missing Functionality
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If this function doesn't quite do what you need to do, try using `foldStaticHttpRequests`.
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The `wihtStaticHttpRequests` definition basically just documents a common pattern.
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Its implementation is just 1 line of code.
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-}
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withBackendTask :
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(Block view -> BackendTask view)
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-> (Block (BackendTask view) -> BackendTask view)
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withBackendTask reducer markdown =
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markdown |> foldStaticHttpRequests |> BackendTask.andThen reducer
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{-| This will reduce a `Block` to `Html` similar to what the
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[`defaultHtmlRenderer` in elm-markdown](https://package.elm-lang.org/packages/dillonkearns/elm-markdown/latest/Markdown-Renderer#defaultHtmlRenderer)
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does. That is, it renders similar to what the CommonMark spec expects.
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|
|
It also takes a list of attributes for convenience, so if you want to attach styles,
|
|
id's, classes or events, you can use this.
|
|
|
|
However, **the attributes parameter is ignored for `Text` nodes**.
|
|
|
|
-}
|
|
reduceHtml : List (Html.Attribute msg) -> Block (Html msg) -> Html msg
|
|
reduceHtml attributes markdown =
|
|
let
|
|
attrsFromAlignment maybeAlignment =
|
|
case maybeAlignment of
|
|
Just Block.AlignLeft ->
|
|
Attr.align "left" :: attributes
|
|
|
|
Just Block.AlignCenter ->
|
|
Attr.align "center" :: attributes
|
|
|
|
Just Block.AlignRight ->
|
|
Attr.align "right" :: attributes
|
|
|
|
Nothing ->
|
|
attributes
|
|
in
|
|
case markdown of
|
|
Heading { level, children } ->
|
|
case level of
|
|
Block.H1 ->
|
|
Html.h1 attributes children
|
|
|
|
Block.H2 ->
|
|
Html.h2 attributes children
|
|
|
|
Block.H3 ->
|
|
Html.h3 attributes children
|
|
|
|
Block.H4 ->
|
|
Html.h4 attributes children
|
|
|
|
Block.H5 ->
|
|
Html.h5 attributes children
|
|
|
|
Block.H6 ->
|
|
Html.h6 attributes children
|
|
|
|
Paragraph children ->
|
|
Html.p attributes children
|
|
|
|
BlockQuote children ->
|
|
Html.blockquote attributes children
|
|
|
|
Text content ->
|
|
Html.text content
|
|
|
|
CodeSpan content ->
|
|
Html.code attributes [ Html.text content ]
|
|
|
|
Strong children ->
|
|
Html.strong attributes children
|
|
|
|
Emphasis children ->
|
|
Html.em attributes children
|
|
|
|
Strikethrough children ->
|
|
Html.span (Attr.style "text-decoration" "line-through" :: attributes) children
|
|
|
|
Link link ->
|
|
case link.title of
|
|
Just title ->
|
|
Html.a
|
|
(Attr.href link.destination
|
|
:: Attr.title title
|
|
:: attributes
|
|
)
|
|
link.children
|
|
|
|
Nothing ->
|
|
Html.a (Attr.href link.destination :: attributes) link.children
|
|
|
|
Image imageInfo ->
|
|
case imageInfo.title of
|
|
Just title ->
|
|
Html.img
|
|
(Attr.src imageInfo.src
|
|
:: Attr.alt imageInfo.alt
|
|
:: Attr.title title
|
|
:: attributes
|
|
)
|
|
[]
|
|
|
|
Nothing ->
|
|
Html.img
|
|
(Attr.src imageInfo.src
|
|
:: Attr.alt imageInfo.alt
|
|
:: attributes
|
|
)
|
|
[]
|
|
|
|
UnorderedList { items } ->
|
|
Html.ul attributes
|
|
(items
|
|
|> List.map
|
|
(\item ->
|
|
case item of
|
|
Block.ListItem task children ->
|
|
let
|
|
checkbox =
|
|
case task of
|
|
Block.NoTask ->
|
|
Html.text ""
|
|
|
|
Block.IncompleteTask ->
|
|
Html.input
|
|
[ Attr.disabled True
|
|
, Attr.checked False
|
|
, Attr.type_ "checkbox"
|
|
]
|
|
[]
|
|
|
|
Block.CompletedTask ->
|
|
Html.input
|
|
[ Attr.disabled True
|
|
, Attr.checked True
|
|
, Attr.type_ "checkbox"
|
|
]
|
|
[]
|
|
in
|
|
Html.li [] (checkbox :: children)
|
|
)
|
|
)
|
|
|
|
OrderedList { startingIndex, items } ->
|
|
Html.ol
|
|
(case startingIndex of
|
|
1 ->
|
|
Attr.start startingIndex :: attributes
|
|
|
|
_ ->
|
|
attributes
|
|
)
|
|
(items
|
|
|> List.map
|
|
(\itemBlocks ->
|
|
Html.li []
|
|
itemBlocks
|
|
)
|
|
)
|
|
|
|
CodeBlock { body } ->
|
|
Html.pre attributes
|
|
[ Html.code []
|
|
[ Html.text body
|
|
]
|
|
]
|
|
|
|
HardLineBreak ->
|
|
Html.br attributes []
|
|
|
|
ThematicBreak ->
|
|
Html.hr attributes []
|
|
|
|
Table children ->
|
|
Html.table attributes children
|
|
|
|
TableHeader children ->
|
|
Html.thead attributes children
|
|
|
|
TableBody children ->
|
|
Html.tbody attributes children
|
|
|
|
TableRow children ->
|
|
Html.tr attributes children
|
|
|
|
TableHeaderCell maybeAlignment children ->
|
|
Html.th (attrsFromAlignment maybeAlignment) children
|
|
|
|
TableCell maybeAlignment children ->
|
|
Html.td (attrsFromAlignment maybeAlignment) children
|
|
|
|
|
|
{-| Transform a block that contains functions into a function that produces blocks.
|
|
|
|
One really common use-case is having access to a `Model` inside your html renderers.
|
|
In these cases you want your markdown to be 'rendered to a function'.
|
|
|
|
So let's say you've got a
|
|
[`Markdown.Html.Renderer`]()
|
|
like so:
|
|
|
|
renderHtml :
|
|
Markdown.Html.Renderer
|
|
(List (Model -> Html Msg)
|
|
-> (Model -> Html Msg)
|
|
)
|
|
|
|
It has this type to be able to depend on the `Model`. Eventually you'll want to render to
|
|
`Model -> Html Msg`.
|
|
|
|
So now you can define your
|
|
[`Markdown.Renderer.Renderer`]()
|
|
like so:
|
|
|
|
|
|
renderer : Markdown.Renderer.Renderer (Model -> Html Msg)
|
|
renderer =
|
|
toRenderer
|
|
{ renderHtml = renderHtml
|
|
, renderMarkdown = renderMarkdown
|
|
}
|
|
|
|
renderMarkdown :
|
|
Block (Model -> Html Msg)
|
|
-> (Model -> Html Msg)
|
|
renderMarkdown block model =
|
|
foldFunction block
|
|
-- ^ result : Model -> Block (Html Msg)
|
|
model
|
|
-- ^ result : Block (Html Msg)
|
|
|> reduceHtml
|
|
|
|
-- ^ result : Html Msg
|
|
|
|
-}
|
|
foldFunction : Block (environment -> view) -> (environment -> Block view)
|
|
foldFunction markdown environment =
|
|
markdown |> map ((|>) environment)
|
|
|
|
|
|
{-| Fold your blocks with index information. This uses [`indexedMap`](#indexedMap) under
|
|
the hood.
|
|
|
|
This is quite advanced, but also very useful. If you're looking for a working example,
|
|
please take a look at the test for this function.
|
|
|
|
-}
|
|
foldIndexed : Block (List Int -> view) -> (List Int -> Block view)
|
|
foldIndexed markdown pathSoFar =
|
|
markdown |> indexedMap (\indices view -> view (indices ++ pathSoFar))
|
|
|
|
|
|
{-| Extracts all words from the blocks and inlines. Excludes any markup characters, if
|
|
they had an effect on the markup.
|
|
|
|
The words are split according to the `\s` javascript regular expression (regex).
|
|
|
|
Inline code spans are split, but **code blocks fragments are ignored** (code spans are
|
|
included).
|
|
|
|
If you need something more specific, I highly recommend rolling your own function for
|
|
this.
|
|
|
|
This is useful if you need to e.g. create header slugs.
|
|
|
|
-}
|
|
reduceWords : Block (List String) -> List String
|
|
reduceWords =
|
|
let
|
|
whitespace =
|
|
Regex.fromStringWith { caseInsensitive = True, multiline = True } "\\s"
|
|
|> Maybe.withDefault Regex.never
|
|
|
|
words =
|
|
Regex.split whitespace
|
|
|
|
extractWords block =
|
|
case block of
|
|
Text content ->
|
|
words content
|
|
|
|
CodeSpan content ->
|
|
words content
|
|
|
|
_ ->
|
|
[]
|
|
in
|
|
reduce
|
|
{ extract = extractWords
|
|
, accumulate = List.concat
|
|
}
|
|
|
|
|
|
{-| Thread results through your Blocks.
|
|
|
|
The input is a block that contains possibly failed views. The output becomes `Err`, if
|
|
any of the input block's children had an error (then it's the first error).
|
|
If all of the block's children were `Ok`, then the result is going to be `Ok`.
|
|
|
|
-}
|
|
foldResults : Block (Result error view) -> Result error (Block view)
|
|
foldResults markdown =
|
|
case markdown of
|
|
Heading { level, rawText, children } ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map
|
|
(\chdr ->
|
|
Heading { level = level, rawText = rawText, children = chdr }
|
|
)
|
|
|
|
Paragraph children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map Paragraph
|
|
|
|
BlockQuote children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map BlockQuote
|
|
|
|
Text content ->
|
|
Text content
|
|
|> Ok
|
|
|
|
CodeSpan content ->
|
|
CodeSpan content
|
|
|> Ok
|
|
|
|
Strong children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map Strong
|
|
|
|
Emphasis children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map Emphasis
|
|
|
|
Strikethrough children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map Strikethrough
|
|
|
|
Link { title, destination, children } ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map
|
|
(\chdr ->
|
|
Link { title = title, destination = destination, children = chdr }
|
|
)
|
|
|
|
Image imageInfo ->
|
|
Image imageInfo
|
|
|> Ok
|
|
|
|
UnorderedList { items } ->
|
|
items
|
|
|> List.map
|
|
(\(Block.ListItem task children) ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map (Block.ListItem task)
|
|
)
|
|
|> Result.combine
|
|
|> Result.map (\itms -> UnorderedList { items = itms })
|
|
|
|
OrderedList { startingIndex, items } ->
|
|
items
|
|
|> List.map Result.combine
|
|
|> Result.combine
|
|
|> Result.map
|
|
(\itms ->
|
|
OrderedList { startingIndex = startingIndex, items = itms }
|
|
)
|
|
|
|
CodeBlock codeBlockInfo ->
|
|
CodeBlock codeBlockInfo
|
|
|> Ok
|
|
|
|
HardLineBreak ->
|
|
HardLineBreak
|
|
|> Ok
|
|
|
|
ThematicBreak ->
|
|
ThematicBreak
|
|
|> Ok
|
|
|
|
Table children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map Table
|
|
|
|
TableHeader children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map TableHeader
|
|
|
|
TableBody children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map TableBody
|
|
|
|
TableRow children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map TableRow
|
|
|
|
TableHeaderCell maybeAlignment children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map (TableHeaderCell maybeAlignment)
|
|
|
|
TableCell maybeAlignment children ->
|
|
children
|
|
|> Result.combine
|
|
|> Result.map (TableCell maybeAlignment)
|
|
|
|
|
|
{-| Accumulate elm-page's
|
|
[`BackendTask`](https://package.elm-lang.org/packages/dillonkearns/elm-pages/latest/Pages-BackendTask#Request)s
|
|
over blocks.
|
|
|
|
Using this, it is possible to write reducers that produce views as a result of performing
|
|
static http requests.
|
|
|
|
-}
|
|
foldStaticHttpRequests : Block (BackendTask view) -> BackendTask (Block view)
|
|
foldStaticHttpRequests markdown =
|
|
case markdown of
|
|
Heading { level, rawText, children } ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map
|
|
(\chdr ->
|
|
Heading { level = level, rawText = rawText, children = chdr }
|
|
)
|
|
|
|
Paragraph children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map Paragraph
|
|
|
|
BlockQuote children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map BlockQuote
|
|
|
|
Text content ->
|
|
Text content
|
|
|> BackendTask.succeed
|
|
|
|
CodeSpan content ->
|
|
CodeSpan content
|
|
|> BackendTask.succeed
|
|
|
|
Strong children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map Strong
|
|
|
|
Emphasis children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map Emphasis
|
|
|
|
Strikethrough children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map Strikethrough
|
|
|
|
Link { title, destination, children } ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map
|
|
(\chdr ->
|
|
Link { title = title, destination = destination, children = chdr }
|
|
)
|
|
|
|
Image imageInfo ->
|
|
Image imageInfo
|
|
|> BackendTask.succeed
|
|
|
|
UnorderedList { items } ->
|
|
items
|
|
|> List.map
|
|
(\(Block.ListItem task children) ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map (Block.ListItem task)
|
|
)
|
|
|> allStaticHttp
|
|
|> BackendTask.map (\itms -> UnorderedList { items = itms })
|
|
|
|
OrderedList { startingIndex, items } ->
|
|
items
|
|
|> List.map allStaticHttp
|
|
|> allStaticHttp
|
|
|> BackendTask.map
|
|
(\itms ->
|
|
OrderedList { startingIndex = startingIndex, items = itms }
|
|
)
|
|
|
|
CodeBlock codeBlockInfo ->
|
|
CodeBlock codeBlockInfo
|
|
|> BackendTask.succeed
|
|
|
|
HardLineBreak ->
|
|
HardLineBreak
|
|
|> BackendTask.succeed
|
|
|
|
ThematicBreak ->
|
|
ThematicBreak
|
|
|> BackendTask.succeed
|
|
|
|
Table children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map Table
|
|
|
|
TableHeader children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map TableHeader
|
|
|
|
TableBody children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map TableBody
|
|
|
|
TableRow children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map TableRow
|
|
|
|
TableHeaderCell maybeAlignment children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map (TableHeaderCell maybeAlignment)
|
|
|
|
TableCell maybeAlignment children ->
|
|
children
|
|
|> allStaticHttp
|
|
|> BackendTask.map (TableCell maybeAlignment)
|
|
|
|
|
|
{-| Convert a block of markdown back to markdown text.
|
|
(See the 'Formatting Markdown' test in the test suite.)
|
|
|
|
This just renders one particular style of markdown. Your use-case might need something
|
|
completely different. I recommend taking a look at the source code and adapting it to
|
|
your needs.
|
|
|
|
Note: **This function doesn't support GFM tables**.
|
|
The function `Markdown.PrettyTables.reducePrettyTable` extends this function with table
|
|
pretty-printing.
|
|
Table pretty-printing is complicated, even when ignoring column sizes. The type
|
|
`Block String -> String` is just "not powerful" enough to render a table to a string in
|
|
such a way that it is syntactically valid again.
|
|
|
|
-}
|
|
reducePretty : Block String -> String
|
|
reducePretty block =
|
|
let
|
|
escape toEscape =
|
|
String.replace toEscape ("\\" ++ toEscape)
|
|
in
|
|
case block of
|
|
Heading { level, children } ->
|
|
(case level of
|
|
Block.H1 ->
|
|
"# "
|
|
|
|
Block.H2 ->
|
|
"## "
|
|
|
|
Block.H3 ->
|
|
"### "
|
|
|
|
Block.H4 ->
|
|
"#### "
|
|
|
|
Block.H5 ->
|
|
"##### "
|
|
|
|
Block.H6 ->
|
|
"###### "
|
|
)
|
|
++ String.concat children
|
|
|
|
Text content ->
|
|
content
|
|
|
|
Paragraph children ->
|
|
String.concat children
|
|
|
|
BlockQuote children ->
|
|
children
|
|
|> String.concat
|
|
|> String.split "\n"
|
|
|> List.map (\line -> "> " ++ line)
|
|
|> String.join "\n"
|
|
|
|
Strong children ->
|
|
-- TODO Escaping
|
|
"**" ++ String.replace "**" "\\**" (String.concat children) ++ "**"
|
|
|
|
Emphasis children ->
|
|
"_" ++ escape "_" (String.concat children) ++ "_"
|
|
|
|
Strikethrough children ->
|
|
"~" ++ escape "~" (String.concat children) ++ "~"
|
|
|
|
CodeSpan content ->
|
|
"`" ++ content ++ "`"
|
|
|
|
Link { destination, children } ->
|
|
"[" ++ escape "]" (escape ")" (String.concat children)) ++ "](" ++ destination ++ ")"
|
|
|
|
Image { alt, src, title } ->
|
|
"!["
|
|
++ escape "]" (escape ")" alt)
|
|
++ "]("
|
|
++ src
|
|
++ (title
|
|
|> Maybe.map (\t -> " \"" ++ escape "\"" t ++ "\"")
|
|
|> Maybe.withDefault ""
|
|
)
|
|
++ ")"
|
|
|
|
UnorderedList { items } ->
|
|
items
|
|
|> List.map
|
|
(\(Block.ListItem task children) ->
|
|
case task of
|
|
Block.NoTask ->
|
|
"- " ++ String.concat children
|
|
|
|
Block.IncompleteTask ->
|
|
"- [ ] " ++ String.concat children
|
|
|
|
Block.CompletedTask ->
|
|
"- [X] " ++ String.concat children
|
|
)
|
|
|> String.join "\n"
|
|
|
|
OrderedList { startingIndex, items } ->
|
|
items
|
|
|> List.indexedMap
|
|
(\index children ->
|
|
String.fromInt (index + startingIndex)
|
|
++ ". "
|
|
++ String.concat children
|
|
)
|
|
|> String.join "\n"
|
|
|
|
CodeBlock { body, language } ->
|
|
case language of
|
|
Just langName ->
|
|
"```"
|
|
++ langName
|
|
++ "\n"
|
|
++ body
|
|
++ "```"
|
|
|
|
Nothing ->
|
|
let
|
|
bodyLines =
|
|
body
|
|
|> String.split "\n"
|
|
in
|
|
if bodyLines |> List.any (not << String.startsWith " ") then
|
|
bodyLines
|
|
|> List.map ((++) " ")
|
|
|> String.join "\n"
|
|
|
|
else
|
|
"```\n" ++ body ++ "```"
|
|
|
|
HardLineBreak ->
|
|
"\n\n"
|
|
|
|
ThematicBreak ->
|
|
"---\n"
|
|
|
|
-- For table pretty-printing support, take a look at the Markdown.PrettyTables module
|
|
Table children ->
|
|
""
|
|
|
|
TableHeader children ->
|
|
""
|
|
|
|
TableBody children ->
|
|
""
|
|
|
|
TableRow children ->
|
|
""
|
|
|
|
TableCell align children ->
|
|
""
|
|
|
|
TableHeaderCell align children ->
|
|
""
|
|
|
|
|
|
{-| Reduces a block down to anything that can be accumulated.
|
|
|
|
You provide two functions
|
|
|
|
- `accumulate`: Describe how values of type `a` are combined. Examples: `List.concat`,
|
|
`List.sum`, etc.
|
|
- `extract`: Descibe how a blocks generate values that are supposed to be accumulated.
|
|
|
|
For example, this can count the amount of headings in a markdown document:
|
|
|
|
reduce
|
|
{ accumulate = List.sum
|
|
, extract =
|
|
\block ->
|
|
case block of
|
|
Heading _ ->
|
|
1
|
|
|
|
_ ->
|
|
0
|
|
}
|
|
|
|
Or this extracts code blocks:
|
|
|
|
reduce
|
|
{ accumulate = List.concat
|
|
, extract =
|
|
\block ->
|
|
case block of
|
|
CodeBlock codeBlock ->
|
|
[ codeBlock ]
|
|
|
|
_ ->
|
|
[]
|
|
}
|
|
|
|
The special thing about this function is how you don't have to worry about accumulating
|
|
the other generated values recursively.
|
|
|
|
-}
|
|
reduce : { accumulate : List a -> a, extract : Block a -> a } -> Block a -> a
|
|
reduce { extract, accumulate } block =
|
|
let
|
|
append a b =
|
|
accumulate [ a, b ]
|
|
in
|
|
case block of
|
|
Heading { children } ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
Paragraph children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
BlockQuote children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
Text _ ->
|
|
extract block
|
|
|
|
CodeSpan _ ->
|
|
extract block
|
|
|
|
Strong children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
Emphasis children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
Strikethrough children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
Link link ->
|
|
accumulate link.children
|
|
|> append (extract block)
|
|
|
|
Image _ ->
|
|
extract block
|
|
|
|
UnorderedList { items } ->
|
|
items
|
|
|> List.concatMap
|
|
(\(Block.ListItem _ child) -> child)
|
|
|> accumulate
|
|
|> append (extract block)
|
|
|
|
OrderedList { items } ->
|
|
items
|
|
|> List.concat
|
|
|> accumulate
|
|
|> append (extract block)
|
|
|
|
CodeBlock _ ->
|
|
extract block
|
|
|
|
HardLineBreak ->
|
|
extract block
|
|
|
|
ThematicBreak ->
|
|
extract block
|
|
|
|
Table children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
TableHeader children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
TableBody children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
TableRow children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
TableHeaderCell _ children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
TableCell _ children ->
|
|
accumulate children
|
|
|> append (extract block)
|
|
|
|
|
|
{-| There are two ways of thinking about this function:
|
|
|
|
1. Render a `Block` using the given elm-markdown `Renderer`.
|
|
2. Extract a function of type `(Block view -> view)` out of
|
|
the elm-markdown `Renderer`. This is useful if you want to make use
|
|
of the utilities present in this library.
|
|
|
|
-}
|
|
fromRenderer : Renderer view -> Block view -> view
|
|
fromRenderer renderer markdown =
|
|
case markdown of
|
|
Heading info ->
|
|
renderer.heading info
|
|
|
|
Paragraph children ->
|
|
renderer.paragraph children
|
|
|
|
BlockQuote children ->
|
|
renderer.blockQuote children
|
|
|
|
Text content ->
|
|
renderer.text content
|
|
|
|
CodeSpan content ->
|
|
renderer.codeSpan content
|
|
|
|
Strong children ->
|
|
renderer.strong children
|
|
|
|
Emphasis children ->
|
|
renderer.emphasis children
|
|
|
|
Strikethrough children ->
|
|
renderer.strikethrough children
|
|
|
|
Link { title, destination, children } ->
|
|
renderer.link { title = title, destination = destination } children
|
|
|
|
Image imageInfo ->
|
|
renderer.image imageInfo
|
|
|
|
UnorderedList { items } ->
|
|
renderer.unorderedList items
|
|
|
|
OrderedList { startingIndex, items } ->
|
|
renderer.orderedList startingIndex items
|
|
|
|
CodeBlock info ->
|
|
renderer.codeBlock info
|
|
|
|
HardLineBreak ->
|
|
renderer.hardLineBreak
|
|
|
|
ThematicBreak ->
|
|
renderer.thematicBreak
|
|
|
|
Table children ->
|
|
renderer.table children
|
|
|
|
TableHeader children ->
|
|
renderer.tableHeader children
|
|
|
|
TableBody children ->
|
|
renderer.tableBody children
|
|
|
|
TableRow children ->
|
|
renderer.tableRow children
|
|
|
|
TableHeaderCell maybeAlignment children ->
|
|
renderer.tableHeaderCell maybeAlignment children
|
|
|
|
TableCell maybeAlignment children ->
|
|
renderer.tableCell maybeAlignment children
|
|
|
|
|
|
{-| Convert a function that works with `Block` to a `Renderer` for use with
|
|
elm-markdown.
|
|
|
|
(The second parameter is a [`Markdown.Html.Renderer`](/packages/dillonkearns/elm-markdown/3.0.0/Markdown-Html#Renderer))
|
|
|
|
-}
|
|
toRenderer :
|
|
{ renderMarkdown : Block view -> view
|
|
, renderHtml : Markdown.Html.Renderer (List view -> view)
|
|
}
|
|
-> Renderer view
|
|
toRenderer { renderMarkdown, renderHtml } =
|
|
{ heading = Heading >> renderMarkdown
|
|
, paragraph = Paragraph >> renderMarkdown
|
|
, blockQuote = BlockQuote >> renderMarkdown
|
|
, html = renderHtml
|
|
, text = Text >> renderMarkdown
|
|
, codeSpan = CodeSpan >> renderMarkdown
|
|
, strong = Strong >> renderMarkdown
|
|
, emphasis = Emphasis >> renderMarkdown
|
|
, strikethrough = Emphasis >> renderMarkdown
|
|
, hardLineBreak = HardLineBreak |> renderMarkdown
|
|
, link =
|
|
\{ title, destination } children ->
|
|
Link { title = title, destination = destination, children = children }
|
|
|> renderMarkdown
|
|
, image = Image >> renderMarkdown
|
|
, unorderedList =
|
|
\items ->
|
|
UnorderedList { items = items }
|
|
|> renderMarkdown
|
|
, orderedList =
|
|
\startingIndex items ->
|
|
OrderedList { startingIndex = startingIndex, items = items }
|
|
|> renderMarkdown
|
|
, codeBlock = CodeBlock >> renderMarkdown
|
|
, thematicBreak = ThematicBreak |> renderMarkdown
|
|
, table = Table >> renderMarkdown
|
|
, tableHeader = TableHeader >> renderMarkdown
|
|
, tableBody = TableBody >> renderMarkdown
|
|
, tableRow = TableRow >> renderMarkdown
|
|
, tableHeaderCell = \maybeAlignment -> TableHeaderCell maybeAlignment >> renderMarkdown
|
|
, tableCell = \maybeAlignment -> TableCell maybeAlignment >> renderMarkdown
|
|
}
|
|
|
|
|
|
{-| Bump all `Heading` elements by given positive amount of levels.
|
|
|
|
import Markdown.Block as Block
|
|
|
|
bumpHeadings 2
|
|
(Heading
|
|
{ level = Block.H1
|
|
, rawText = ""
|
|
, children = []
|
|
}
|
|
)
|
|
--> Heading
|
|
--> { level = Block.H3
|
|
--> , rawText = ""
|
|
--> , children = []
|
|
--> }
|
|
|
|
bumpHeadings 1
|
|
(Heading
|
|
{ level = Block.H6
|
|
, rawText = ""
|
|
, children = []
|
|
}
|
|
)
|
|
--> Heading
|
|
--> { level = Block.H6
|
|
--> , rawText = ""
|
|
--> , children = []
|
|
--> }
|
|
|
|
bumpHeadings -1
|
|
(Heading
|
|
{ level = Block.H2
|
|
, rawText = ""
|
|
, children = []
|
|
}
|
|
)
|
|
--> Heading
|
|
--> { level = Block.H2
|
|
--> , rawText = ""
|
|
--> , children = []
|
|
--> }
|
|
|
|
-}
|
|
bumpHeadings : Int -> Block view -> Block view
|
|
bumpHeadings by markdown =
|
|
let
|
|
-- vendored from elm-loop
|
|
for : Int -> (a -> a) -> a -> a
|
|
for =
|
|
let
|
|
for_ : Int -> Int -> (a -> a) -> a -> a
|
|
for_ i n f v =
|
|
if i < n then
|
|
for_ (i + 1) n f (f v)
|
|
|
|
else
|
|
v
|
|
in
|
|
for_ 0
|
|
in
|
|
case markdown of
|
|
Heading info ->
|
|
Heading { info | level = for by bumpHeadingLevel info.level }
|
|
|
|
other ->
|
|
other
|
|
|
|
|
|
|
|
-- LOCAL DEFINITIONS
|
|
|
|
|
|
allStaticHttp : List (BackendTask a) -> BackendTask (List a)
|
|
allStaticHttp =
|
|
List.foldr (BackendTask.map2 (::)) (BackendTask.succeed [])
|
|
|
|
|
|
bumpHeadingLevel : Block.HeadingLevel -> Block.HeadingLevel
|
|
bumpHeadingLevel level =
|
|
case level of
|
|
Block.H1 ->
|
|
Block.H2
|
|
|
|
Block.H2 ->
|
|
Block.H3
|
|
|
|
Block.H3 ->
|
|
Block.H4
|
|
|
|
Block.H4 ->
|
|
Block.H5
|
|
|
|
Block.H5 ->
|
|
Block.H6
|
|
|
|
Block.H6 ->
|
|
Block.H6
|