Made .formatter.exs inputs relocatable (#846)

* Made .formatter.exs inputs relocatable

The .formatter.exs defined paths via a wildcard, but this would only
work if it was executed from the current directory. If it was run from
the topmost directory, none of the paths would be found, and the
inputs would only contain the `.exs` files in the current directory.

I also removed config from the glob, as this is in an umbrella
project, and umbrella apps have a centralized config which isn't in
this directory.

* Only append the formatter directory if the path is relative

* Need to make the ignores absolute paths as well

* Removed forwared slashes

Author: scohen

apps/language_server/.formatter.exs

@@ -1,6 +1,15 @@
+current_directory = Path.dirname(__ENV__.file)
+
 impossible_to_format = [
-  "test/fixtures/token_missing_error/lib/has_error.ex",
-  "test/fixtures/project_with_tests/test/error_test.exs"
+  Path.join([current_directory, "test", "fixtures", "token_missing_error", "lib", "has_error.ex"]),
+  Path.join([
+    current_directory,
+    "test",
+    "fixtures",
+    "project_with_tests",
+    "test",
+    "error_test.exs"
+  ])
 ]
 
 deps =
@@ -29,8 +38,8 @@ proto_dsl = [
   inputs:
     Enum.flat_map(
       [
-        "*.exs",
-        "{lib,test,config}/**/*.{ex,exs}"
+        Path.join(current_directory, "*.exs"),
+        Path.join(current_directory, "{lib,test}/**/*.{ex,exs}")
       ],
       &Path.wildcard(&1, match_dot: true)
     ) -- impossible_to_format

apps/language_server/lib/language_server/experimental/code_mod/format.ex

@@ -115,7 +115,13 @@ defmodule ElixirLS.LanguageServer.Experimental.CodeMod.Format do
 
     inputs_apply? =
       Enum.any?(inputs, fn input_glob ->
-        glob = Path.join(formatter_dir, input_glob)
+        glob =
+          if Path.type(input_glob) == :relative do
+            Path.join(formatter_dir, input_glob)
+          else
+            input_glob
+          end
+
         PathGlobVendored.match?(document.path, glob, match_dot: true)
       end)