add suggested subreddits for search pages (ref #104)

inc/processSearchResults.js

@@ -15,6 +15,15 @@ module.exports = function() {
           search_firstpage = true
         }
         
+        let suggested_subreddits = false        
+        if(json.suggested_subreddits) {
+          if(json.suggested_subreddits.data) {
+            if(json.suggested_subreddits.data.children.length > 0) {
+              suggested_subreddits = json.suggested_subreddits.data.children
+            }
+          }
+        }
+        
         if(json.data.children) {
           let view_more_posts = false
           let posts_limit = 25
@@ -90,7 +99,8 @@ module.exports = function() {
           search_firstpage: search_firstpage,
           before: before,
           after: after,
-          posts: posts
+          posts: posts,
+          suggested_subreddits: suggested_subreddits,
         }
 
         resolve(obj)

routes.js

@@ -916,28 +916,43 @@ module.exports = (app, redis, fetch, RedditAPI) => {
           if(result.status === 200) {
             result.json()
             .then(json => {
-              redis.setex(key, config.setexs.searches, JSON.stringify(json), (error) => {
-                if(error) {
-                  console.error('Error setting the searches key to redis.', error)
-                  return res.render('index', { json: null, user_preferences: req.cookies })
-                } else {
-                  console.log('Fetched search results from Reddit.');
-                  (async () => {
-                    let processed_json = await processSearchResults(json, true, after, before, req.cookies)
-                    return res.render('search', {
-                      no_query: false,
-                      json: processed_json,
-                      q: q,
-                      restrict_sr: restrict_sr,
-                      nsfw: nsfw,
-                      subreddit: subreddit,
-                      sortby: sortby,
-                      past: past,
-                      user_preferences: req.cookies
-                    })
-                  })()
+              (async () => {
+                /**
+                * Fetch suggested subreddits when the restrict_sr option is
+                * turned off ("limit my search to") and we are on the first search
+                * page (just like in Reddit).
+                */
+                json.suggested_subreddits = {}
+                if(restrict_sr === 'off' && before == '' && after == '') {
+                  let url = `https://reddit.com/subreddits/search.json?q=${q}&include_over_18=${nsfw}&limit=3`
+                  const response = await fetch(url)
+                  const data = await response.json()
+                  json.suggested_subreddits = data
                 }
-              })
+              
+                redis.setex(key, config.setexs.searches, JSON.stringify(json), (error) => {
+                  if(error) {
+                    console.error('Error setting the searches key to redis.', error)
+                    return res.render('index', { json: null, user_preferences: req.cookies })
+                  } else {
+                    console.log('Fetched search results from Reddit.');
+                    (async () => {
+                      let processed_json = await processSearchResults(json, true, after, before, req.cookies)
+                      return res.render('search', {
+                        no_query: false,
+                        json: processed_json,
+                        q: q,
+                        restrict_sr: restrict_sr,
+                        nsfw: nsfw,
+                        subreddit: subreddit,
+                        sortby: sortby,
+                        past: past,
+                        user_preferences: req.cookies
+                      })
+                    })()
+                  }
+                })
+              })()
             })
           } else {
             console.error(`Something went wrong while fetching data from Reddit. ${result.status} – ${result.statusText}`)

static/css/styles.css

@@ -1228,6 +1228,23 @@ a.sub-to-subreddit.gray {
   border-radius: 0;
   margin-bottom: 11px;
 }
+/* SUGGESTED SUBREDDITS ON SEARCH PAGES */
+.suggested-subreddits {
+  margin: 0px 0px 30px 1%;
+}
+.suggested-subreddits h3 {
+  border-bottom: 1px solid #7d7d7d;
+  max-width: 820px;
+  margin: 0px 0px 16px 10px;
+  padding: 0px 0px 5px 0px;
+  font-size: 0.9rem;
+}
+.suggested-subreddits .sub-button {
+  margin: 0px 0px 7px 0px;
+}
+.suggested-subreddits .description {
+  font-size: 0.8rem;
+}
 /* REDDIT STYLES */
 .md .md-spoiler-text {
   border-radius:2px;

views/search.pug

@@ -100,6 +100,40 @@ html
       if json.posts.length === 0 && !no_query
         p no results
       else
+        if json.suggested_subreddits
+          .suggested-subreddits
+            h3 suggested subreddits
+            each suggested_subreddit in json.suggested_subreddits
+              .link
+                .entry
+                  -
+                    let subbed_to_this_subreddit = false
+                    let subbed = []
+                    if(user_preferences.subbed_subreddits && Array.isArray(user_preferences.subbed_subreddits))
+                      subbed = user_preferences.subbed_subreddits
+                    for(let i = 0; i < subbed.length; i++) {
+                      if(subbed[i].toLowerCase() === suggested_subreddit.data.display_name.toLowerCase())
+                        subbed_to_this_subreddit = true
+                    }
+                  .content
+                    .title
+                      a(href="" + suggested_subreddit.data.url + "", rel="noopener noreferrer")
+                        h2 #{suggested_subreddit.data.display_name_prefixed}: #{cleanTitle(suggested_subreddit.data.title)}
+                    .sub-button
+                      if subbed_to_this_subreddit
+                        a(href="/unsubscribe/" + suggested_subreddit.data.display_name + "?b=/r/" + subreddit + "?q=" + q + "§nsfw=" + nsfw + "", class="sub-to-subreddit gray", title="subscriptions are saved in your browser's cookies") unsubscribe
+                      else
+                        a(href="/subscribe/" + suggested_subreddit.data.display_name + "?b=/r/" + subreddit + "?q=" + q + "§nsfw=" + nsfw + "", class="sub-to-subreddit", title="subscriptions are saved in your browser's cookies") subscribe
+                    .description
+                      p #{cleanTitle(suggested_subreddit.data.public_description)}
+                    .meta
+                      p.subscribers #{kFormatter(suggested_subreddit.data.subscribers)} subscribers,
+                      p.submitted &nbsp; created
+                        span(title="" + toUTCString(suggested_subreddit.data.created) +  "") #{timeDifference(suggested_subreddit.data.created)}
+                      .links
+                        if suggested_subreddit.data.over_18
+                          span.tag.nsfw NSFW
+            a(href="/subreddits/search?q="+ q +"", class="btn") show more similar subreddits
         each link in json.posts
           .link
             .upvotes