Add Tangled as a supported source URL pattern

lib/ex_doc.ex

@@ -146,8 +146,8 @@ defmodule ExDoc do
 
     * `:source_url_pattern` - Public URL of the project for source links. This is derived
       automatically from the project's `:source_url` and `:source_ref` when using one of
-      the supported public hosting services (currently GitHub, GitLab, or Bitbucket). If
-      you are using one of those services with their default public hostname, you do not
+      the supported public hosting services (currently GitHub, GitLab, Bitbucket, or Tangled).
+      If you are using one of those services with their default public hostname, you do not
       need to set this configuration.
 
       However, if using a different solution, or self-hosting, you will need to set this

lib/ex_doc/cli.ex

@@ -254,7 +254,7 @@ defmodule ExDoc.CLI do
     ExDoc by default provides links to the source code implementation as
     long as --source-url or --source-url-pattern is provided. If you
     provide --source-url, ExDoc will inflect the url pattern automatically
-    for GitHub, GitLab, and Bitbucket URLs. For example:
+    for GitHub, GitLab, Bitbucket, and Tangled URLs. For example:
 
         --source-url "https://github.com/elixir-ecto/ecto"
 

lib/ex_doc/config.ex

@@ -207,6 +207,9 @@ defmodule ExDoc.Config do
   defp known_pattern("bitbucket.org/" <> _, ref),
     do: {:ok, "src/#{ref}/%{path}#cl-%{line}"}
 
+  defp known_pattern("tangled.org/" <> _, ref),
+    do: {:ok, "blob/#{ref}/%{path}#L%{line}"}
+
   defp known_pattern(_host_with_path, _ref),
     do: :error