Make default pack extensions configurable and default to png and gif

CHANGELOG.md

@@ -26,6 +26,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Federation: Support for `Question` and `Answer` objects
 - Federation: Support for reports
 - Configuration: `poll_limits` option
+- Configuration: `pack_extensions` option
 - Configuration: `safe_dm_mentions` option
 - Configuration: `link_name` option
 - Configuration: `fetch_initial_posts` option

config/config.exs

@@ -99,6 +99,7 @@
 
 config :pleroma, :emoji,
   shortcode_globs: ["/emoji/custom/**/*.png"],
+  pack_extensions: [".png", ".gif"],
   groups: [
     # Put groups that have higher priority than defaults here. Example in `docs/config/custom_emoji.md`
     Custom: ["/emoji/*.png", "/emoji/**/*.png"]

docs/config.md

@@ -604,6 +604,7 @@ Configure OAuth 2 provider capabilities:
 
 ## :emoji
 * `shortcode_globs`: Location of custom emoji files. `*` can be used as a wildcard. Example `["/emoji/custom/**/*.png"]`
+* `pack_extensions`: A list of file extensions for emojis, when no emoji.txt for a pack is present. Example `[".png", ".gif"]`
 * `groups`: Emojis are ordered in groups (tags). This is an array of key-value pairs where the key is the groupname and the value the location or array of locations. `*` can be used as a wildcard. Example `[Custom: ["/emoji/*.png", "/emoji/custom/*.png"]]`
 * `default_manifest`: Location of the JSON-manifest. This manifest contains information about the emoji-packs you can download. Currently only one manifest can be added (no arrays).
 

lib/pleroma/emoji.ex

@@ -148,11 +148,13 @@ defp load_pack(pack_dir, emoji_groups) do
     if File.exists?(emoji_txt) do
       load_from_file(emoji_txt, emoji_groups)
     else
+      extensions = Pleroma.Config.get([:emoji, :pack_extensions])
+
       Logger.info(
-        "No emoji.txt found for pack \"#{pack_name}\", assuming all .png files are emoji"
+        "No emoji.txt found for pack \"#{pack_name}\", assuming all #{Enum.join(extensions, ", ")} files are emoji"
       )
 
-      make_shortcode_to_file_map(pack_dir, [".png"])
+      make_shortcode_to_file_map(pack_dir, extensions)
       |> Enum.map(fn {shortcode, rel_file} ->
         filename = Path.join("/emoji/#{pack_name}", rel_file)