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export default function suggest (data) {
return input => {
const firstChar = input[0]
if (firstChar === ':' && data.emoji) {
return suggestEmoji(data.emoji)(input)
}
if (firstChar === '@' && data.users) {
return suggestUsers(data.users)(input)
}
return []
}
}
function suggestEmoji (emojis) {
return 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 += Number(!!a.imageUrl) * 10
bScore += Number(!!b.imageUrl) * 10
// Sort alphabetically
const alphabetically = a.displayText > b.displayText ? 1 : -1
return bScore - aScore + alphabetically
})
}
}
function suggestUsers (users) {
return input => {
const noPrefix = input.toLowerCase().substr(1)
return users.filter(
user =>
user.screen_name.toLowerCase().startsWith(noPrefix) ||
user.name.toLowerCase().startsWith(noPrefix)
/* eslint-disable camelcase */
).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
bScore += b.screen_name.toLowerCase().startsWith(noPrefix) * 2
// Matches on name takes second priority
aScore += a.name.toLowerCase().startsWith(noPrefix)
bScore += b.name.toLowerCase().startsWith(noPrefix)
const diff = bScore * 10 - 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
}).map(({ screen_name, name, profile_image_url_original }) => ({
displayText: screen_name,
detailText: name,
imageUrl: profile_image_url_original,
replacement: '@' + screen_name
}))
/* eslint-enable camelcase */
}
}
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