mobilizon.chapril.org-mobil.../lib/service/formatter/formatter.ex
Thomas Citharel 6d80bf43ea
Refactor adding tags to an event
Also refactor extracting tags from content, now uses Pleroma's Formatter

Signed-off-by: Thomas Citharel <tcit@tcit.fr>
2019-07-26 12:06:26 +02:00

115 lines
3.8 KiB
Elixir

# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/formatter.ex
defmodule Mobilizon.Service.Formatter do
@moduledoc """
Formats input text to structured data, extracts mentions and hashtags
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Actors
@link_regex ~r"((?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+)|[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+"ui
@markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
@auto_linker_config hashtag: true,
hashtag_handler: &Mobilizon.Service.Formatter.hashtag_handler/4,
mention: true,
mention_handler: &Mobilizon.Service.Formatter.mention_handler/4
def escape_mention_handler("@" <> nickname = mention, buffer, _, _) do
case Mobilizon.Actors.get_actor_by_name(nickname) do
%Actor{} ->
# escape markdown characters with `\\`
# (we don't want something like @user__name to be parsed by markdown)
String.replace(mention, @markdown_characters_regex, "\\\\\\1")
_ ->
buffer
end
end
def mention_handler("@" <> nickname, buffer, _opts, acc) do
case Actors.get_actor_by_name(nickname) do
%Actor{id: id, url: url, preferred_username: preferred_username} = actor ->
link =
"<span class='h-card'><a data-user='#{id}' class='u-url mention' href='#{url}'>@<span>#{
preferred_username
}</span></a></span>"
{link, %{acc | mentions: MapSet.put(acc.mentions, {"@" <> nickname, actor})}}
_ ->
{buffer, acc}
end
end
def hashtag_handler("#" <> tag = tag_text, _buffer, _opts, acc) do
tag = String.downcase(tag)
url = "#{MobilizonWeb.Endpoint.url()}/tag/#{tag}"
link = "<a class='hashtag' data-tag='#{tag}' href='#{url}' rel='tag'>#{tag_text}</a>"
{link, %{acc | tags: MapSet.put(acc.tags, {tag_text, tag})}}
end
@doc """
Parses a text and replace plain text links with HTML. Returns a tuple with a result text, mentions, and hashtags.
If the 'safe_mention' option is given, only consecutive mentions at the start the post are actually mentioned.
"""
@spec linkify(String.t(), keyword()) ::
{String.t(), [{String.t(), Actor.t()}], [{String.t(), String.t()}]}
def linkify(text, options \\ []) do
options = options ++ @auto_linker_config
acc = %{mentions: MapSet.new(), tags: MapSet.new()}
{text, %{mentions: mentions, tags: tags}} = AutoLinker.link_map(text, acc, options)
{text, MapSet.to_list(mentions), MapSet.to_list(tags)}
end
@doc """
Escapes a special characters in mention names.
"""
def mentions_escape(text, options \\ []) do
options =
Keyword.merge(options,
mention: true,
url: false,
mention_handler: &escape_mention_handler/4
)
AutoLinker.link(text, options)
end
def html_escape({text, mentions, hashtags}, type) do
{html_escape(text, type), mentions, hashtags}
end
def html_escape(_text, "text/html") do
# HTML.filter_tags(text)
end
def html_escape(text, "text/plain") do
Regex.split(@link_regex, text, include_captures: true)
|> Enum.map_every(2, fn chunk ->
{:safe, part} = Phoenix.HTML.html_escape(chunk)
part
end)
|> Enum.join("")
end
def truncate(text, max_length \\ 200, omission \\ "...") do
# Remove trailing whitespace
text = Regex.replace(~r/([^ \t\r\n])([ \t]+$)/u, text, "\\g{1}")
if String.length(text) < max_length do
text
else
length_with_omission = max_length - String.length(omission)
String.slice(text, 0, length_with_omission) <> omission
end
end
end