Add eslint-plugin-jsx-a11y (#1651)

* Add eslint-plugin-jsx-a11y.

* Fix npm script.

* Adjust npm scripts so test also runs lint.

* Fix existing lint errors.

* Don't break on a11y issues.

* Add role and tabIndex.

* Add vim and Mac files to .gitignore and .dockerignore.

* Handle htmlFor (partially), a that's actually a button.

* Fix missing tabIndex.

* Add cursor:pointer to load-more

* Revert change to load_more.

* Fixes based on review.

* Update yarn.lock.

* Don't try to install fsevents on Linux (hides warning noise).

app/assets/javascripts/components/components/autosuggest_textarea.jsx

@@ -178,7 +178,12 @@ const AutosuggestTextarea = React.createClass({
 
         <div style={{ display: (suggestions.size > 0 && !suggestionsHidden) ? 'block' : 'none' }} className='autosuggest-textarea__suggestions'>
           {suggestions.map((suggestion, i) => (
-            <div key={suggestion} className={`autosuggest-textarea__suggestions__item ${i === selectedSuggestion ? 'selected' : ''}`} onClick={this.onSuggestionClick.bind(this, suggestion)}>
+            <div
+              role='button'
+              tabIndex='0'
+              key={suggestion}
+              className={`autosuggest-textarea__suggestions__item ${i === selectedSuggestion ? 'selected' : ''}`}
+              onClick={this.onSuggestionClick.bind(this, suggestion)}>
               <AutosuggestAccountContainer id={suggestion} />
             </div>
           ))}

app/assets/javascripts/components/components/button.jsx

@@ -9,6 +9,7 @@ const Button = React.createClass({
     block: React.PropTypes.bool,
     secondary: React.PropTypes.bool,
     size: React.PropTypes.number,
+    style: React.PropTypes.object,
     children: React.PropTypes.node
   },
 

app/assets/javascripts/components/components/column_back_button.jsx

@@ -15,13 +15,13 @@ const ColumnBackButton = React.createClass({
   mixins: [PureRenderMixin],
 
   handleClick () {
-    if (window.history && window.history.length == 1) this.context.router.push("/");
+    if (window.history && window.history.length === 1) this.context.router.push("/");
     else this.context.router.goBack();
   },
 
   render () {
     return (
-      <div onClick={this.handleClick} className='column-back-button'>
+      <div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button'>
         <i className='fa fa-fw fa-chevron-left' style={iconStyle} />
         <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
       </div>

app/assets/javascripts/components/components/column_back_button_slim.jsx

@@ -31,7 +31,7 @@ const ColumnBackButtonSlim = React.createClass({
   render () {
     return (
       <div style={{ position: 'relative' }}>
-        <div style={outerStyle} onClick={this.handleClick} className='column-back-button'>
+        <div role='button' tabIndex='0' style={outerStyle} onClick={this.handleClick} className='column-back-button'>
           <i className='fa fa-fw fa-chevron-left' style={iconStyle} />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </div>

app/assets/javascripts/components/components/column_collapsable.jsx

@@ -46,7 +46,9 @@ const ColumnCollapsable = React.createClass({
 
     return (
       <div style={{ position: 'relative' }}>
-        <div title={`${title}`} style={{...iconStyle }} className={`column-icon ${collapsedClassName}`} onClick={this.handleToggleCollapsed}><i className={`fa fa-${icon}`} /></div>
+        <div role='button' tabIndex='0' title={`${title}`} style={{...iconStyle }} className={`column-icon ${collapsedClassName}`} onClick={this.handleToggleCollapsed}>
+          <i className={`fa fa-${icon}`} />
+        </div>
 
         <Motion defaultStyle={{ opacity: 0, height: 0 }} style={{ opacity: spring(collapsed ? 0 : 100), height: spring(collapsed ? 0 : fullHeight, collapsed ? undefined : { stiffness: 150, damping: 9 }) }}>
           {({ opacity, height }) =>

app/assets/javascripts/components/components/load_more.jsx

@@ -1,7 +1,7 @@
 import { FormattedMessage } from 'react-intl';
 
 const LoadMore = ({ onClick }) => (
-  <a href='#' className='load-more' onClick={onClick}>
+  <a href="#" className='load-more' role='button' onClick={onClick}>
     <FormattedMessage id='status.load_more' defaultMessage='Load more' />
   </a>
 );

app/assets/javascripts/components/components/media_gallery.jsx

@@ -220,7 +220,7 @@ const MediaGallery = React.createClass({
       }
 
       children = (
-        <div style={spoilerStyle} className='media-spoiler' onClick={this.handleOpen}>
+        <div role='button' tabIndex='0' style={spoilerStyle} className='media-spoiler' onClick={this.handleOpen}>
           <span style={spoilerSpanStyle}>{warning}</span>
           <span style={spoilerSubSpanStyle}><FormattedMessage id='status.sensitive_toggle' defaultMessage='Click to view' /></span>
         </div>

app/assets/javascripts/components/components/permalink.jsx

@@ -6,7 +6,8 @@ const Permalink = React.createClass({
 
   propTypes: {
     href: React.PropTypes.string.isRequired,
-    to: React.PropTypes.string.isRequired
+    to: React.PropTypes.string.isRequired,
+    children: React.PropTypes.node.isRequired
   },
 
   handleClick (e) {

app/assets/javascripts/components/components/status_content.jsx

@@ -119,7 +119,7 @@ const StatusContent = React.createClass({
       return (
         <div className='status__content' style={{ cursor: 'pointer' }} onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp}>
           <p style={{ marginBottom: hidden && status.get('mentions').size === 0 ? '0px' : '' }} >
-            <span dangerouslySetInnerHTML={spoilerContent} />  <a className='status__content__spoiler-link' onClick={this.handleSpoilerClick}>{toggleText}</a>
+            <span dangerouslySetInnerHTML={spoilerContent} />  <a tabIndex='0' className='status__content__spoiler-link' role='button' onClick={this.handleSpoilerClick}>{toggleText}</a>
           </p>
 
           {mentionsPlaceholder}

app/assets/javascripts/components/components/video_player.jsx

@@ -194,7 +194,7 @@ const VideoPlayer = React.createClass({
     if (!this.state.visible) {
       if (sensitive) {
         return (
-          <div style={{...spoilerStyle, width: `${width}px`, height: `${height}px` }} className='media-spoiler' onClick={this.handleVisibility}>
+          <div role='button' tabIndex='0' style={{...spoilerStyle, width: `${width}px`, height: `${height}px` }} className='media-spoiler' onClick={this.handleVisibility}>
             {spoilerButton}
             <span style={spoilerSpanStyle}><FormattedMessage id='status.sensitive_warning' defaultMessage='Sensitive content' /></span>
             <span style={spoilerSubSpanStyle}><FormattedMessage id='status.sensitive_toggle' defaultMessage='Click to view' /></span>
@@ -202,7 +202,7 @@ const VideoPlayer = React.createClass({
         );
       } else {
         return (
-          <div style={{...spoilerStyle, width: `${width}px`, height: `${height}px` }} className='media-spoiler' onClick={this.handleVisibility}>
+          <div role='button' tabIndex='0' style={{...spoilerStyle, width: `${width}px`, height: `${height}px` }} className='media-spoiler' onClick={this.handleVisibility}>
             {spoilerButton}
             <span style={spoilerSpanStyle}><FormattedMessage id='status.media_hidden' defaultMessage='Media hidden' /></span>
             <span style={spoilerSubSpanStyle}><FormattedMessage id='status.sensitive_toggle' defaultMessage='Click to view' /></span>
@@ -213,7 +213,7 @@ const VideoPlayer = React.createClass({
 
     if (this.state.preview && !autoplay) {
       return (
-        <div style={{ cursor: 'pointer', position: 'relative', marginTop: '8px', width: `${width}px`, height: `${height}px`, background: `url(${media.get('preview_url')}) no-repeat center`, backgroundSize: 'cover' }} onClick={this.handleOpen}>
+        <div role='button' tabIndex='0' style={{ cursor: 'pointer', position: 'relative', marginTop: '8px', width: `${width}px`, height: `${height}px`, background: `url(${media.get('preview_url')}) no-repeat center`, backgroundSize: 'cover' }} onClick={this.handleOpen}>
           {spoilerButton}
           <div style={{ position: 'absolute', top: '50%', left: '50%', fontSize: '36px', transform: 'translate(-50%, -50%)', padding: '5px', borderRadius: '100px', color: 'rgba(255, 255, 255, 0.8)' }}><i className='fa fa-play' /></div>
         </div>
@@ -225,7 +225,7 @@ const VideoPlayer = React.createClass({
         {spoilerButton}
         {muteButton}
         {expandButton}
-        <video ref={this.setRef} src={media.get('url')} autoPlay={!isIOS()} loop={true} muted={this.state.muted} style={videoStyle} onClick={this.handleVideoClick} />
+        <video role='button' tabIndex='0' ref={this.setRef} src={media.get('url')} autoPlay={!isIOS()} loop={true} muted={this.state.muted} style={videoStyle} onClick={this.handleVideoClick} />
       </div>
     );
   }