Merge remote-tracking branch 'upstream/develop' into docs

* upstream/develop: (193 commits)
  fix user avatar fallback logic
  remove dead code
  make bio textarea resizable vertically only
  remove dead code
  remove dead code
  fix crazy watch logic in conversation
  show three dot button only if needed
  hide mute conversation button to guests
  update keyBy
  generate idObj at timeline level
  fix pin showing logic in conversation
  Show a message when JS is disabled
  Initialize chat only if user is logged in and it wasn't initialized before
  i18n/Update Japanese
  i18n/Update pedantic Japanese
  sync profile tab state with location query
  refactor TabSwitcher
  use better name of controlled prop
  fix potential bug to render active tab in controlled way
  remove unused param
  ...

1 files changed, 94 insertions, 0 deletions

diff --git a/src/components/emoji-input/suggestor.js b/src/components/emoji-input/suggestor.js
new file mode 100644
index 00000000..aec5c39d
--- /dev/null
+++ b/src/components/emoji-input/suggestor.js
@@ -0,0 +1,94 @@
+import { debounce } from 'lodash'
+/**
+ * suggest - generates a suggestor function to be used by emoji-input
+ * data: object providing source information for specific types of suggestions:
+ * data.emoji - optional, an array of all emoji available i.e.
+ *   (state.instance.emoji + state.instance.customEmoji)
+ * data.users - optional, an array of all known users
+ * updateUsersList - optional, a function to search and append to users
+ *
+ * Depending on data present one or both (or none) can be present, so if field
+ * doesn't support user linking you can just provide only emoji.
+ */
+
+const debounceUserSearch = debounce((data, input) => {
+  data.updateUsersList(input)
+}, 500, { leading: true, trailing: false })
+
+export default data => input => {
+  const firstChar = input[0]
+  if (firstChar === ':' && data.emoji) {
+    return suggestEmoji(data.emoji)(input)
+  }
+  if (firstChar === '@' && data.users) {
+    return suggestUsers(data)(input)
+  }
+  return []
+}
+
+export const suggestEmoji = emojis => input => {
+  const noPrefix = input.toLowerCase().substr(1)
+  return emojis
+    .filter(({ displayText }) => displayText.toLowerCase().startsWith(noPrefix))
+    .sort((a, b) => {
+      let aScore = 0
+      let bScore = 0
+
+      // Make custom emojis a priority
+      aScore += a.imageUrl ? 10 : 0
+      bScore += b.imageUrl ? 10 : 0
+
+      // Sort alphabetically
+      const alphabetically = a.displayText > b.displayText ? 1 : -1
+
+      return bScore - aScore + alphabetically
+    })
+}
+
+export const suggestUsers = data => input => {
+  const noPrefix = input.toLowerCase().substr(1)
+  const users = data.users
+
+  const newUsers = users.filter(
+    user =>
+      user.screen_name.toLowerCase().startsWith(noPrefix) ||
+      user.name.toLowerCase().startsWith(noPrefix)
+
+    /* taking only 20 results so that sorting is a bit cheaper, we display
+     * only 5 anyway. could be inaccurate, but we ideally we should query
+     * backend anyway
+     */
+  ).slice(0, 20).sort((a, b) => {
+    let aScore = 0
+    let bScore = 0
+
+    // Matches on screen name (i.e. user@instance) makes a priority
+    aScore += a.screen_name.toLowerCase().startsWith(noPrefix) ? 2 : 0
+    bScore += b.screen_name.toLowerCase().startsWith(noPrefix) ? 2 : 0
+
+    // Matches on name takes second priority
+    aScore += a.name.toLowerCase().startsWith(noPrefix) ? 1 : 0
+    bScore += b.name.toLowerCase().startsWith(noPrefix) ? 1 : 0
+
+    const diff = (bScore - aScore) * 10
+
+    // Then sort alphabetically
+    const nameAlphabetically = a.name > b.name ? 1 : -1
+    const screenNameAlphabetically = a.screen_name > b.screen_name ? 1 : -1
+
+    return diff + nameAlphabetically + screenNameAlphabetically
+    /* eslint-disable camelcase */
+  }).map(({ screen_name, name, profile_image_url_original }) => ({
+    displayText: screen_name,
+    detailText: name,
+    imageUrl: profile_image_url_original,
+    replacement: '@' + screen_name + ' '
+  }))
+
+  // BE search users if there are no matches
+  if (newUsers.length === 0 && data.updateUsersList) {
+    debounceUserSearch(data, noPrefix)
+  }
+  return newUsers
+  /* eslint-enable camelcase */
+}