From 70876b475dd724aa9cb1b5d32843e2807ef2146d Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Sun, 20 Oct 2019 02:12:15 +0900
Subject: [PATCH] Fix #6743: i18n: rst_prolog breaks the translation

---
 CHANGES                   |  1 +
 sphinx/transforms/i18n.py | 35 +++++++++++++++++++++--------------
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/CHANGES b/CHANGES
index 26ea1afb6..de9c8aa3b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -32,6 +32,7 @@ Bugs fixed
 * #6655: image URLs containing ``data:`` causes gettext builder crashed
 * #6584: i18n: Error when compiling message catalogs on Hindi
 * #6718: i18n: KeyError is raised if section title and table title are same
+* #6743: i18n: :confval:`rst_prolog` breaks the translation
 * #6708: mathbase: Some deprecated functions have removed
 * #6709: autodoc: mock object does not work as a class decorator
 * #6712: Allow not to install sphinx.testing as runtime (mainly for ALT Linux)
diff --git a/sphinx/transforms/i18n.py b/sphinx/transforms/i18n.py
index 8435d4b7a..6512fd43d 100644
--- a/sphinx/transforms/i18n.py
+++ b/sphinx/transforms/i18n.py
@@ -53,21 +53,28 @@ def publish_msgstr(app: "Sphinx", source: str, source_path: str, source_line: in
     :return: document
     :rtype: docutils.nodes.document
     """
-    from sphinx.io import SphinxI18nReader
-    reader = SphinxI18nReader()
-    reader.setup(app)
-    parser = app.registry.create_source_parser(app, 'restructuredtext')
-    doc = reader.read(
-        source=StringInput(source=source,
-                           source_path="%s:%s:<translated>" % (source_path, source_line)),
-        parser=parser,
-        settings=settings,
-    )
     try:
-        doc = doc[0]  # type: ignore
-    except IndexError:  # empty node
-        pass
-    return doc
+        # clear rst_prolog temporarily
+        rst_prolog = config.rst_prolog
+        config.rst_prolog = None  # type: ignore
+
+        from sphinx.io import SphinxI18nReader
+        reader = SphinxI18nReader()
+        reader.setup(app)
+        parser = app.registry.create_source_parser(app, 'restructuredtext')
+        doc = reader.read(
+            source=StringInput(source=source,
+                               source_path="%s:%s:<translated>" % (source_path, source_line)),
+            parser=parser,
+            settings=settings,
+        )
+        try:
+            doc = doc[0]  # type: ignore
+        except IndexError:  # empty node
+            pass
+        return doc
+    finally:
+        config.rst_prolog = rst_prolog  # type: ignore
 
 
 class PreserveTranslatableMessages(SphinxTransform):