Allows heading separator in IO.ANSI.Docs to not to have spaces around "|" (#9616)

This is supported by GFM (GitHub Flavored Markdown).

2 files changed, 20 insertions, 2 deletions

diff --git a/lib/elixir/lib/io/ansi/docs.ex b/lib/elixir/lib/io/ansi/docs.ex
index 3320d7472..4d9534271 100644
--- a/lib/elixir/lib/io/ansi/docs.ex
+++ b/lib/elixir/lib/io/ansi/docs.ex
@@ -348,8 +348,9 @@ defmodule IO.ANSI.Docs do
 
   defp split_into_columns(line, options) do
     line
+    |> String.trim(" ")
     |> String.trim("|")
-    |> String.split(" | ")
+    |> String.split("|")
     |> Enum.map(&render_column(&1, options))
   end
 
@@ -449,7 +450,7 @@ defmodule IO.ANSI.Docs do
   end
 
   defp table_line?(line) do
-    line =~ " | "
+    line =~ ~r/[:\ -]\|[:\ -]/
   end
 
   ## Helpers
diff --git a/lib/elixir/test/elixir/io/ansi/docs_test.exs b/lib/elixir/test/elixir/io/ansi/docs_test.exs
index cd6e606bb..6b20858cb 100644
--- a/lib/elixir/test/elixir/io/ansi/docs_test.exs
+++ b/lib/elixir/test/elixir/io/ansi/docs_test.exs
@@ -369,6 +369,23 @@ defmodule IO.ANSI.DocsTest do
       assert format(table) == expected
     end
 
+    test "table with heading alignment and no space around \"|\"" do
+      table = """
+      | Value | Encoding | Value | Encoding |
+      |------:|:---------|------:|:---------|
+      |     0 | A        |    17 | R        |
+      |     1 | B        |    18 | S        |
+      """
+
+      expected =
+        "\e[7m" <>
+          "Value | Encoding | Value | Encoding\e[0m\n" <>
+          "    0 | A        |    17 | R       \n" <>
+          "    1 | B        |    18 | S       \n\e[0m"
+
+      assert format(table) == expected
+    end
+
     test "table with formatting in cells" do
       assert format("`a` | _b_\nc | d") == "\e[36ma\e[0m | \e[4mb\e[0m\nc | d\n\e[0m"
       assert format("`abc` | d \n`e` | f") == "\e[36mabc\e[0m | d\n\e[36me\e[0m   | f\n\e[0m"