Assume packs without emoji.txt only have emoji pictures, unhardcode

unhardcode: remove hardcoded /instance/static and actually use the config option
as it is used in other places.

packs without emoji.txt: these are now assumed to have .png files that
are all emojis, their names are used as shortcodes

config/config.exs

@@ -100,8 +100,8 @@ config :pleroma, :emoji,
   shortcode_globs: ["/emoji/custom/**/*.png"],
   groups: [
     # Put groups that have higher priority than defaults here. Example in `docs/config/custom_emoji.md`
-    Finmoji: ["/finmoji/128px/*-128.png", "/instance/static/emoji/finmoji/128px/*-128.png"],
-    Custom: ["/emoji/*.png", "/emoji/custom/*.png", "/instance/static/emoji/**/*.png"]
+    Finmoji: ["/finmoji/128px/*-128.png"],
+    Custom: ["/emoji/*.png", "/emoji/custom/*.png"]
   ]
 
 config :pleroma, :uri_schemes,

lib/mix/tasks/pleroma/emoji.ex

@@ -115,11 +115,14 @@ defmodule Mix.Tasks.Pleroma.Emoji do
 
         IO.puts(IO.ANSI.format(["Writing emoji.txt for ", :bright, pack_name]))
 
+        common_pack_path = Path.join([
+          "/", Pleroma.Config.get!([:instance, :static_dir]), "emoji", pack_name
+        ])
         emoji_txt_str =
           Enum.map(
             files,
             fn {shortcode, path} ->
-              "#{shortcode}, /instance/static/emoji/#{pack_name}/#{path}"
+              "#{shortcode}, #{Path.join(common_pack_path, path)}"
             end
           )
           |> Enum.join("\n")
@@ -182,11 +185,8 @@ defmodule Mix.Tasks.Pleroma.Emoji do
         cwd: tmp_pack_dir
       )
 
-    emoji_map =
-      find_all_emoji(tmp_pack_dir, exts) |>
-      Enum.map(&Path.relative_to(&1, tmp_pack_dir)) |>
-      Enum.map(fn f -> {f |> Path.basename() |> Path.rootname(), f} end) |>
-      Enum.into(%{})
+    emoji_map = Pleroma.Emoji.make_shortcode_to_file_map(tmp_pack_dir, exts)
+
 
     File.write!(files_name, Poison.encode!(emoji_map, pretty: true))
 
@@ -219,21 +219,6 @@ defmodule Mix.Tasks.Pleroma.Emoji do
 
   end
 
-  defp find_all_emoji(dir, exts) do
-    Enum.reduce(
-      File.ls!(dir),
-      [],
-      fn f, acc ->
-        filepath = Path.join(dir, f)
-        if File.dir?(filepath) do
-          acc ++ find_all_emoji(filepath, exts)
-        else
-          acc ++ [filepath]
-        end
-      end
-    ) |> Enum.filter(fn f -> Path.extname(f) in exts end)
-  end
-
   defp fetch_manifest(from) do
     Tesla.get!(from).body |> Poison.decode!()
   end

lib/pleroma/emoji.ex

@@ -110,7 +110,7 @@ defmodule Pleroma.Emoji do
         emojis =
         (Enum.flat_map(
               packs,
-             fn pack -> load_from_file(Path.join([emoji_dir_path, pack, "emoji.txt"])) end
+              fn pack -> load_pack(Path.join(emoji_dir_path, pack)) end
             ) ++
           load_from_file("config/emoji.txt") ++
           load_from_file("config/custom_emoji.txt") ++
@@ -123,6 +123,50 @@ defmodule Pleroma.Emoji do
     :ok
   end
 
+  defp load_pack(pack_dir) do
+    pack_name = Path.basename(pack_dir)
+
+    emoji_txt = Path.join(pack_dir, "emoji.txt")
+    if File.exists?(emoji_txt) do
+      load_from_file(emoji_txt)
+    else
+      Logger.info("No emoji.txt found for pack \"#{pack_name}\", assuming all .png files are emoji")
+
+      common_pack_path = Path.join([
+        "/", Pleroma.Config.get!([:instance, :static_dir]), "emoji", pack_name
+      ])
+      make_shortcode_to_file_map(pack_dir, [".png"]) |>
+        Enum.map(fn {shortcode, rel_file} ->
+          filename = Path.join(common_pack_path, rel_file)
+
+          # If no tag matches, use the pack name as a tag
+          {shortcode, filename, to_string(match_extra(@groups, filename))}
+        end)
+    end
+  end
+
+  def make_shortcode_to_file_map(pack_dir, exts) do
+    find_all_emoji(pack_dir, exts) |>
+      Enum.map(&Path.relative_to(&1, pack_dir)) |>
+      Enum.map(fn f -> {f |> Path.basename() |> Path.rootname(), f} end) |>
+      Enum.into(%{})
+  end
+
+  def find_all_emoji(dir, exts) do
+    Enum.reduce(
+      File.ls!(dir),
+      [],
+      fn f, acc ->
+        filepath = Path.join(dir, f)
+        if File.dir?(filepath) do
+          acc ++ find_all_emoji(filepath, exts)
+        else
+          acc ++ [filepath]
+        end
+      end
+    ) |> Enum.filter(fn f -> Path.extname(f) in exts end)
+  end
+
   defp load_from_file(file) do
     if File.exists?(file) do
       load_from_file_stream(File.stream!(file))