File 1164-stdlib-man_docs-no-longer-depends-on-ERL_TOP.patch of Package erlang

From 4274a4ce244677840e280a7172166cef7006ef92 Mon Sep 17 00:00:00 2001
From: Fredrik Frantzen <frazze@erlang.org>
Date: Mon, 24 Nov 2025 11:15:24 +0100
Subject: [PATCH] stdlib: man_docs no longer depends on ERL_TOP

fixes render_man test
test fails gracefully for modules not in OTP
---
 lib/stdlib/src/man_docs.erl          | 24 ++++++++++++++----------
 lib/stdlib/test/shell_docs_SUITE.erl | 23 ++++++++++-------------
 2 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/lib/stdlib/src/man_docs.erl b/lib/stdlib/src/man_docs.erl
index 2bcac70f1e..4b5bb45b6f 100644
--- a/lib/stdlib/src/man_docs.erl
+++ b/lib/stdlib/src/man_docs.erl
@@ -67,16 +67,7 @@ markdown_to_manpage(Markdown, Path, Section) ->
         markdown_to_manpage1(shell_docs_markdown:parse_md(Markdown), Path, Section).
 markdown_to_manpage1(MarkdownChunks, Path, Section) ->
     Path1 = filename:absname(Path),
-    App = case filename:split(string:prefix(Path1, os:getenv("ERL_TOP"))) of
-        ["/", "lib", AppStr | _] ->
-            list_to_atom(AppStr);
-        ["lib", AppStr | _] ->
-            list_to_atom(AppStr);
-        ["/", "erts" | _] ->
-            list_to_atom("erts");
-        ["nomatch"] ->
-            error("ERL_TOP environment variable doesn't match the PATH " ++ Path)
-    end,
+    App = get_app(Path1),
     Version = case application:load(App) of
         ok -> {ok,Vsn} = application:get_key(App, vsn), Vsn;
         {error, {"no such file or directory","erts.app"}} -> erlang:system_info(version);
@@ -91,6 +82,19 @@ markdown_to_manpage1(MarkdownChunks, Path, Section) ->
     I = conv(MarkdownChunks, Name),
     iolist_to_binary([Prelude|I]).
 
+get_app(Path) ->
+    case string:split(Path, "/erts/") of
+            [_, _] -> list_to_atom("erts");
+            _ -> case string:split(Path, "/lib/") of
+                [_, Rest] ->
+                    case string:split(Rest, "/") of
+                        [AppStr, _] -> list_to_atom(AppStr);
+                        _ -> error("Could not find app from path " ++ Path)
+                    end;
+                _ -> error("Could not find app from path " ++ Path)
+        end
+    end.
+
 get_name([{h1,_,[Name]}|_], _) when is_binary(Name) ->
     Name;
 get_name(_, Default) when is_binary(Default) ->
diff --git a/lib/stdlib/test/shell_docs_SUITE.erl b/lib/stdlib/test/shell_docs_SUITE.erl
index 3c163030d4..f3da18ad10 100644
--- a/lib/stdlib/test/shell_docs_SUITE.erl
+++ b/lib/stdlib/test/shell_docs_SUITE.erl
@@ -319,17 +319,16 @@ render_callback(_Config) ->
     ok.
 
 render_man(_Config) ->
-    Old_ERL_TOP = os:getenv("ERL_TOP"),
-    case Old_ERL_TOP of
-        false -> os:putenv("ERL_TOP", code:root_dir());
-        _ -> ok
-    end,
     docsmap(
         fun(Mod, #docs_v1{metadata = Metadata} = D) ->
             try
                 Path1 = case Metadata of
                     #{source_path := Path} -> Path;
-                    #{} -> proplists:get_value(source, proplists:get_value(compile, Mod:module_info()))
+                    #{} -> try
+                            proplists:get_value(source, proplists:get_value(compile, Mod:module_info()))
+                        catch _:_ ->
+                            throw({error, no_path_to_source})
+                        end
                 end,
                 man_docs:module_to_manpage(Mod, Path1, D, "3")
             catch _E:R:ST ->
@@ -338,10 +337,6 @@ render_man(_Config) ->
                 exit(R)
             end
         end),
-    case Old_ERL_TOP of
-        false -> os:unsetenv("ERL_TOP");
-        _ -> os:putenv("ERL_TOP", Old_ERL_TOP)
-    end,
     ok.
 
 docsmap(Fun) ->
@@ -365,9 +360,11 @@ docsmap(Fun) ->
                 try
                   _ = Fun(Mod, Docs),
                   {ok, self(), Mod}
-                catch E:R:ST ->
-                    io:format("Failed to render ~p~n~p:~p:~p~n",[Mod,E,R,ST]),
-                    erlang:raise(E,R,ST)
+                catch throw:{error, no_path_to_source} ->
+                        ok;
+                    E:R:ST ->
+                        io:format("Failed to render ~p~n~p:~p:~p~n",[Mod,E,R,ST]),
+                        erlang:raise(E,R,ST)
                 end
             end
       end,
-- 
2.51.0