Merge branch 'fix/991-version-generation' into 'develop'

version generation

Closes #991

See merge request pleroma/pleroma!1291

mix.exs

@@ -176,7 +176,9 @@ defp version(version) do
            ahead <- String.replace(describe, tag, "") do
         {String.replace_prefix(tag, "v", ""), if(ahead != "", do: String.trim(ahead))}
       else
-        _ -> {nil, nil}
+        _ ->
+          {commit_hash, 0} = System.cmd("git", ["rev-parse", "--short", "HEAD"])
+          {nil, "-0-g" <> String.trim(commit_hash)}
       end
 
     if git_tag && version != git_tag do
@@ -203,7 +205,17 @@ defp version(version) do
             string -> "+" <> string
           end).()
 
-    [version, git_pre_release, build]
+    branch_name =
+      with {branch_name, 0} <- System.cmd("git", ["rev-parse", "--abbrev-ref", "HEAD"]),
+           true <- branch_name != "master" do
+        branch_name =
+          String.trim(branch_name)
+          |> String.replace(~r/\W+/, "-")
+
+        "-" <> branch_name
+      end
+
+    [version, git_pre_release, branch_name, build]
     |> Enum.filter(fn string -> string && string != "" end)
     |> Enum.join()
   end