don't crash when unable to find app for module

Author: lukaszsamson

apps/language_server/lib/language_server/doc_links.ex

@@ -29,17 +29,26 @@ defmodule ElixirLS.LanguageServer.DocLinks do
   end
 
   def hex_docs_module_link(module) do
-    {app, vsn} = get_app(module)
-    "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html"
+    case get_app(module) do
+      {app, vsn} ->
+        "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html"
+      nil -> nil
+    end
   end
 
   def hex_docs_function_link(module, function, arity) do
-    {app, vsn} = get_app(module)
-    "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html##{function}/#{arity}"
+    case get_app(module) do
+      {app, vsn} ->
+        "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html##{function}/#{arity}"
+      nil -> nil
+    end
   end
 
   def hex_docs_type_link(module, type, arity) do
-    {app, vsn} = get_app(module)
-    "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html#t:#{type}/#{arity}"
+    case get_app(module) do
+      {app, vsn} ->
+        "#{@hex_base_url}/#{app}/#{vsn}/#{inspect(module)}.html#t:#{type}/#{arity}"
+      nil -> nil
+    end
   end
 end

apps/language_server/lib/language_server/providers/hover.ex

@@ -52,23 +52,38 @@ defmodule ElixirLS.LanguageServer.Providers.Hover do
 
   defp build_module_link(module) do
     if ElixirSense.Core.Introspection.elixir_module?(module) do
-      "[View on hexdocs](#{DocLinks.hex_docs_module_link(module)})"
+      url = DocLinks.hex_docs_module_link(module)
+      if url do
+        "[View on hexdocs](#{url})\n\n"
+      else
+        ""
+      end
     else
       ""
     end
   end
 
   defp build_function_link(module, function, arity) do
     if ElixirSense.Core.Introspection.elixir_module?(module) do
-      "[View on hexdocs](#{DocLinks.hex_docs_function_link(module, function, arity)})"
+      url = DocLinks.hex_docs_function_link(module, function, arity)
+      if url do
+        "[View on hexdocs](#{url})\n\n"
+      else
+        ""
+      end
     else
       ""
     end
   end
 
   defp build_type_link(module, type, arity) do
     if module != nil and ElixirSense.Core.Introspection.elixir_module?(module) do
-      "[View on hexdocs](#{DocLinks.hex_docs_type_link(module, type, arity)})\n\n"
+      url = DocLinks.hex_docs_type_link(module, type, arity)
+      if url do
+        "[View on hexdocs](#{url})\n\n"
+      else
+        ""
+      end
     else
       ""
     end