Passing Config Down With The Reader Monad

src/components/blocks/image.ts

@@ -2,6 +2,7 @@
 
 import React from 'react';
 import * as AssetUtils from 'utils/Asset';
+import { BlockElement } from 'types/capi-thrift-models';
 
 // ----- Setup ----- //
 
@@ -17,6 +18,9 @@ interface Image {
 
 // ----- Functions ----- //
 
+const isImage = (elem: BlockElement): boolean =>
+  elem.type === 'image';
+
 const imageElement = (alt: string, assets: AssetUtils.Asset[], salt: string): React.ReactNode =>
     h('img', {
         sizes: '100%',
@@ -39,6 +43,7 @@ function imageBlock(image: Image, assets: AssetUtils.Asset[], salt: string): Rea
 // ----- Exports ----- //
 
 export {
+    isImage,
     imageBlock,
     imageElement
 };

src/components/liveblog/LiveblogArticle.tsx

@@ -8,12 +8,14 @@ import LiveblogKeyEvents from './LiveblogKeyEvents';
 import LiveblogBody from './LiveblogBody';
 import HeaderImage from '../shared/HeaderImage';
 import Tags from '../shared/Tags';
-import { Option } from 'types/Option';
-import { PillarStyles, PillarId, wideColumnWidth, baseMultiply } from 'styles';
-import { Series, Contributor } from '../../types/Capi';
-import { Tag, Block, BlockElement } from 'types/capi-thrift-models';
+import { PillarStyles, wideColumnWidth, baseMultiply, getPillarStyles } from 'styles';
+import { Tag } from 'types/capi-thrift-models';
 import { css, SerializedStyles } from '@emotion/core'
 import { palette, wide } from '@guardian/src-foundations'
+import { Env } from 'types/Env';
+import { Reader } from 'types/Reader';
+import { isImage } from 'components/blocks/image';
+import { fromNullable } from 'types/Option';
 
 const LiveblogArticleStyles: SerializedStyles = css`
     background: ${palette.neutral[97]};
@@ -43,62 +45,52 @@ const HeaderImageStyles = (pillarStyles: PillarStyles): SerializedStyles => css`
 `;
 
 interface LiveblogArticleProps {
-    headline: string;
-    standfirst: string;
-    bylineHtml: string;
-    webPublicationDate: string;
-    body: string;
-    tags: Tag[];
-    pillarId: PillarId;
-    mainImage: Option<BlockElement>;
-    pillarStyles: PillarStyles;
-    contributors: Contributor[];
-    series: Series;
-    bodyElements: Block[];
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    capi: any;
     isLive: boolean;
-    imageSalt: string;
 }
 
-const LiveblogArticle = ({
-    headline,
-    standfirst,
-    bylineHtml,
-    webPublicationDate,
-    pillarId,
-    tags,
-    mainImage,
-    pillarStyles,
-    contributors,
-    series,
-    bodyElements,
-    imageSalt
-}: LiveblogArticleProps): JSX.Element =>
-    <main css={LiveblogArticleStyles}>
-        <div css={BorderStyles}>
-            <LiveblogSeries series={series} pillarStyles={pillarStyles}/>
-            <LiveblogHeadline headline={headline} pillarStyles={pillarStyles}/>
-            <LiveblogStandfirst standfirst={standfirst} pillarStyles={pillarStyles}/>
-            <LiveblogByline
-                byline={bylineHtml}
-                pillarStyles={pillarStyles}
-                pillarId={pillarId}
-                publicationDate={webPublicationDate}
-                contributors={contributors}
-                imageSalt={imageSalt}
-            />
-            <HeaderImage
-                image={mainImage}
-                imageSalt={imageSalt}
-                className={HeaderImageStyles(pillarStyles)}
-            />
-            <LiveblogKeyEvents bodyElements={bodyElements} pillarStyles={pillarStyles}/>
-            <LiveblogBody
-                bodyElements={bodyElements}
-                pillarStyles={pillarStyles}
-                imageSalt={imageSalt}
-            />
-            <Tags tags={tags} background={palette.neutral[93]}/>
-        </div>
-    </main>
+const LiveblogArticle = ({ capi }: LiveblogArticleProps): Reader<Env, JSX.Element | null> => Reader.do(function* () {
+
+    const { type, fields, tags, webPublicationDate, pillarId, blocks } = capi;
+    const [series] = tags.filter((tag: Tag) => tag.type === 'series');
+    const pillarStyles = getPillarStyles(pillarId);
+    const contributors = tags.filter((tag: Tag) => tag.type === 'contributor');
+    const bodyElements = type === 'liveblog' ? blocks.body : blocks.body[0].elements;
+    const image = fromNullable(blocks.main.elements.filter(isImage)[0]);
+
+    const headerImage = yield HeaderImage({ image: image, className: HeaderImageStyles(pillarStyles) });
+    const liveblogByline = yield LiveblogByline({
+        byline: fields.bylineHtml,
+        pillarId,
+        publicationDate: webPublicationDate,
+        contributors,
+    });
+    const liveblogBody = yield LiveblogBody({ bodyElements, pillarStyles });
+
+    return Reader.of<Env, JSX.Element | null>(
+            <main css={LiveblogArticleStyles}>
+                <div css={BorderStyles}>
+                    <LiveblogSeries series={series} pillarStyles={pillarStyles}/>
+                    <LiveblogHeadline
+                        headline={fields.headline}
+                        pillarStyles={pillarStyles}
+                    />
+                    <LiveblogStandfirst
+                        standfirst={fields.standfirst}
+                        pillarStyles={pillarStyles}
+                    />
+                    { liveblogByline }
+                    { headerImage }
+                    <LiveblogKeyEvents
+                        bodyElements={bodyElements}
+                        pillarStyles={pillarStyles}
+                    />
+                    { liveblogBody }
+                    <Tags tags={tags} background={palette.neutral[93]}/>
+                </div>
+            </main>
+        );
+}());
 
 export default LiveblogArticle;

src/components/liveblog/LiveblogBody.tsx

@@ -6,6 +6,8 @@ import { render } from 'renderBlocks';
 import { Block } from 'types/capi-thrift-models';
 
 import { css, SerializedStyles } from '@emotion/core'
+import { Reader } from 'types/Reader';
+import { Env } from 'types/Env';
 
 const LiveBodyStyles = (pillarStyles: PillarStyles): SerializedStyles => css`
     .rich-link,
@@ -25,33 +27,32 @@ const LiveBodyStyles = (pillarStyles: PillarStyles): SerializedStyles => css`
 interface LiveblogBodyProps {
     pillarStyles: PillarStyles;
     bodyElements: Block[];
-    imageSalt: string;
 }
 
-const LiveblogBody= ({ pillarStyles, bodyElements, imageSalt }: LiveblogBodyProps): JSX.Element => {
+function LiveblogBody({ pillarStyles, bodyElements }: LiveblogBodyProps): Reader<Env, JSX.Element> {
     const initialBlocks = bodyElements.slice(0, 7);
     const LoadMore = ({ total }: { total: number }): JSX.Element | null => total > 10
         ? <LiveblogLoadMore pillarStyles={pillarStyles}/> 
         : null;
 
     return (
-        <article css={LiveBodyStyles(pillarStyles)}>
-            {
-                initialBlocks.map((block: Block) => {
-                    return <LiveblogBlock
+        Reader.asks(env =>
+            <article css={LiveBodyStyles(pillarStyles)}>
+                { initialBlocks.map((block: Block) =>
+                    <LiveblogBlock
                         key={block.id}
                         pillarStyles={pillarStyles} 
                         highlighted={!!block.attributes.keyEvent}
                         title={block.title}
                         firstPublishedDate={block.firstPublishedDate}
-                        lastModifiedDate={block.lastModifiedDate}>
-                            <>{render(block.elements, imageSalt).html}</>
-                        </LiveblogBlock>
-                })
-            }
-            <LoadMore total={bodyElements.length}/>
-        </article>
-    )
+                        lastModifiedDate={block.lastModifiedDate}
+                    >
+                        <>{render(block.elements).run(env).html}</>
+                    </LiveblogBlock>
+                ) }
+                <LoadMore total={bodyElements.length}/>
+            </article>
+    ))
 }
 
 export default LiveblogBody;

src/components/liveblog/LiveblogByline.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { textSans, PillarStyles, PillarId } from '../../styles';
+import { textSans, PillarStyles, PillarId, getPillarStyles } from 'styles';
 
 import { Keyline } from '../shared/Keyline';
 
@@ -9,6 +9,8 @@ import { Contributor } from '../../types/Capi';
 import { formatDate } from 'utils/date';
 import Avatar from 'components/shared/Avatar';
 import LeftColumn from 'components/shared/LeftColumn';
+import { Env } from 'types/Env';
+import { Reader } from 'types/Reader';
 
 const LiveblogBylineStyles = ({ liveblogBackground }: PillarStyles): SerializedStyles => css`
     background: ${liveblogBackground};
@@ -46,39 +48,34 @@ const LiveblogBylineStyles = ({ liveblogBackground }: PillarStyles): SerializedS
 
 interface LiveblogBylineProps {
     byline: string;
-    pillarStyles: PillarStyles;
     publicationDate: string;
     contributors: Contributor[];
     pillarId: PillarId;
-    imageSalt: string;
 }
 
-const LiveblogByline = ({
+function LiveblogByline({
     byline,
-    pillarStyles,
     publicationDate,
     contributors,
     pillarId,
-    imageSalt
-}: LiveblogBylineProps): JSX.Element => {
-
-    return (
+}: LiveblogBylineProps): Reader<Env, JSX.Element> {
+    const pillarStyles = getPillarStyles(pillarId);
+
+    return Avatar({ contributors, bgColour: pillarStyles.featureHeadline }).map(avatar =>
+        // This is not an iterator, ESLint is confused
+        // eslint-disable-next-line react/jsx-key
         <div css={[LiveblogBylineStyles(pillarStyles)]}>
             <Keyline pillar={pillarId} type={'liveblog'}/>
             <LeftColumn>
-                <Avatar
-                    contributors={contributors}
-                    bgColour={pillarStyles.featureHeadline}
-                    imageSalt={imageSalt}
-                />
+                { avatar }
                 <div className="author">
                     <address dangerouslySetInnerHTML={{__html: byline}}></address>
                     <time className="date">{ formatDate(new Date(publicationDate)) }</time>
                     <div className="follow">Get alerts on this story</div>
                 </div>
             </LeftColumn>
         </div>
-    )
+    );
 }
 
 export default LiveblogByline;