From 16b93b98516df3fcc79a52847fa89fdda5b187c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20H=C3=B6gberg?= <john@erlang.org>
Date: Fri, 5 Oct 2018 10:05:59 +0200
Subject: epp: Allow user to set source name independently of input file name

Note that this does *not* affect -include()'d files or the -file()
directive.
---
 lib/stdlib/src/epp.erl | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'lib/stdlib/src')

diff --git a/lib/stdlib/src/epp.erl b/lib/stdlib/src/epp.erl
index cc34d4bdd3..181a524db6 100644
--- a/lib/stdlib/src/epp.erl
+++ b/lib/stdlib/src/epp.erl
@@ -117,6 +117,7 @@ open(Name, File, StartLocation, Path, Pdm) ->
 		  {'ok', Epp} | {'ok', Epp, Extra} | {'error', ErrorDescriptor} when
       Options :: [{'default_encoding', DefEncoding :: source_encoding()} |
 		  {'includes', IncludePath :: [DirectoryName :: file:name()]} |
+		  {'source_name', SourceName :: file:name()} |
 		  {'macros', PredefMacros :: macros()} |
 		  {'name',FileName :: file:name()} |
 		  'extra'],
@@ -248,6 +249,7 @@ parse_file(Ifile, Path, Predefs) ->
         {'ok', [Form]} | {'ok', [Form], Extra} | {error, OpenError} when
       FileName :: file:name(),
       Options :: [{'includes', IncludePath :: [DirectoryName :: file:name()]} |
+		  {'source_name', SourceName :: file:name()} |
 		  {'macros', PredefMacros :: macros()} |
 		  {'default_encoding', DefEncoding :: source_encoding()} |
 		  'extra'],
@@ -540,9 +542,10 @@ server(Pid, Name, Options, #epp{pre_opened=PreOpened}=St) ->
             init_server(Pid, Name, Options, St)
     end.
 
-init_server(Pid, Name, Options, St0) ->
+init_server(Pid, FileName, Options, St0) ->
+    SourceName = proplists:get_value(source_name, Options, FileName),
     Pdm = proplists:get_value(macros, Options, []),
-    Ms0 = predef_macros(Name),
+    Ms0 = predef_macros(FileName),
     case user_predef(Pdm, Ms0) of
 	{ok,Ms1} ->
 	    #epp{file = File, location = AtLocation} = St0,
@@ -552,14 +555,14 @@ init_server(Pid, Name, Options, St0) ->
             epp_reply(Pid, {ok,self(),Encoding}),
             %% ensure directory of current source file is
             %% first in path
-            Path = [filename:dirname(Name) |
+            Path = [filename:dirname(FileName) |
                     proplists:get_value(includes, Options, [])],
-            St = St0#epp{delta=0, name=Name, name2=Name,
+            St = St0#epp{delta=0, name=SourceName, name2=SourceName,
 			 path=Path, macs=Ms1,
 			 default_encoding=DefEncoding},
             From = wait_request(St),
             Anno = erl_anno:new(AtLocation),
-            enter_file_reply(From, file_name(Name), Anno,
+            enter_file_reply(From, file_name(SourceName), Anno,
 			     AtLocation, code),
             wait_req_scan(St);
 	{error,E} ->
-- 
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