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File 2451-erl_docgen-Add-since-attribute-to-XML-taglist-tag.patch of Package erlang (Revision db1acd30fa2136b2cf32ed954074cb8e)

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From a3e60ee38fada03c31f3120dc1d925511903b713 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Sun, 5 Mar 2023 22:41:18 +0100
Subject: [PATCH 1/4] erl_docgen: Add "since" attribute to XML taglist/tag

Usable to indicate OTP version when a particular option
was introduced.
---
 lib/erl_docgen/priv/dtd/common.dtd         |  1 +
 lib/erl_docgen/priv/xsl/db_html.xsl        |  7 ++++++-
 lib/erl_docgen/src/docgen_xml_to_chunk.erl | 14 ++++++++++++--
 lib/stdlib/src/shell_docs.erl              | 10 ++++++++--
 4 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/lib/erl_docgen/priv/dtd/common.dtd b/lib/erl_docgen/priv/dtd/common.dtd
index b8fc0e3af4..9825e9e9b9 100644
--- a/lib/erl_docgen/priv/dtd/common.dtd
+++ b/lib/erl_docgen/priv/dtd/common.dtd
@@ -54,6 +54,7 @@
 <!ATTLIST list                 type (ordered|bulleted) "bulleted" >
 <!ELEMENT taglist             (tag,item+)+ >
 <!ELEMENT tag                 (#PCDATA|c|i|em|br|%refs;|marker|anno)* >
+<!ATTLIST tag                 since CDATA #IMPLIED>
 <!ELEMENT item                (%inline;|%block;|warning|note|change|dont|do|quote|table)* >
 
 
diff --git a/lib/erl_docgen/priv/xsl/db_html.xsl b/lib/erl_docgen/priv/xsl/db_html.xsl
index caed4219ef..77b301347a 100644
--- a/lib/erl_docgen/priv/xsl/db_html.xsl
+++ b/lib/erl_docgen/priv/xsl/db_html.xsl
@@ -1251,10 +1251,15 @@
 
   <xsl:template match="taglist/tag">
     <xsl:param name="chapnum"/>
-    <dt>
+    <dt class="title-link">
       <strong>
         <xsl:apply-templates/>
       </strong>
+      <xsl:if test="string-length(@since) > 0">
+	<div class="title-since since">
+	  <xsl:value-of select="@since"/>
+	</div>
+      </xsl:if>
     </dt>
   </xsl:template>
 
diff --git a/lib/erl_docgen/src/docgen_xml_to_chunk.erl b/lib/erl_docgen/src/docgen_xml_to_chunk.erl
index a795b205c2..d607a09b17 100644
--- a/lib/erl_docgen/src/docgen_xml_to_chunk.erl
+++ b/lib/erl_docgen/src/docgen_xml_to_chunk.erl
@@ -485,13 +485,23 @@ transform_types(Dom,Acc) ->
 
 transform_taglist(Attr,Content) ->
     Items =
-        lists:map(fun({tag,A,C}) ->
-                          {dt,A,C};
+        lists:map(fun({tag,_A,_C}=Tag) ->
+                          transform_tag(Tag);
                      ({item,A,C}) ->
                           {dd,A,C}
                   end, Content),
     {dl,Attr,Items}.
 
+transform_tag({tag, Attr0, C}) ->
+    Attr1 = lists:map(fun({since,Vsn}) ->
+                              {since,
+                               unicode:characters_to_binary(Vsn)};
+                         (A) ->
+                              A
+                      end,
+                      Attr0),
+    {dt,Attr1,C}.
+
 %% if we have {func,[],[{name,...},{name,....},...]}
 %% we convert it to one {func,[],[{name,...}] per arity lowest first.
 transform_funcs([Func|T],Acc) ->
diff --git a/lib/stdlib/src/shell_docs.erl b/lib/stdlib/src/shell_docs.erl
index 51e1272eb3..d9959c473e 100644
--- a/lib/stdlib/src/shell_docs.erl
+++ b/lib/stdlib/src/shell_docs.erl
@@ -872,10 +872,16 @@ render_element({li,[],Content},[l | _] = State, Pos, Ind,D) ->
 
 render_element({dl,_,Content},State,Pos,Ind,D) ->
     render_docs(Content, [dl|State], Pos, Ind,D);
-render_element({dt,_,Content},[dl | _] = State,Pos,Ind,D) ->
+render_element({dt,Since,Content},[dl | _] = State,Pos,Ind,D) ->
+    Suffix = case Since of
+                 [{since, Vsn}] ->
+                     ":     (since " ++ unicode:characters_to_list(Vsn) ++ ")\n";
+                 _ ->
+                     ":\n"
+             end,
     Underline = sansi(underline),
     {Docs, _NewPos} = render_docs(Content, [li | State], Pos, Ind, D),
-    {[Underline,Docs,ransi(underline),":","\n"], 0};
+    {[Underline,Docs,ransi(underline),Suffix], 0};
 render_element({dd,_,Content},[dl | _] = State,Pos,Ind,D) ->
     trimnlnl(render_docs(Content, [li | State], Pos, Ind + 2, D));
 
-- 
2.35.3

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