Fix #3370: the caption of code-block is not picked up for translation

CHANGES

@@ -13,6 +13,8 @@ Features added
 Bugs fixed
 ----------
 
+* #3370: the caption of code-block is not picked up for translation
+
 Testing
 --------
 

sphinx/directives/code.py

@@ -73,8 +73,8 @@ def container_wrapper(directive, literal_node, caption):
         raise ValueError(parsed[0])
     caption_node = nodes.caption(parsed[0].rawsource, '',
                                  *parsed[0].children)
-    caption_node.source = parsed[0].source
+    caption_node.source = literal_node.source
-    caption_node.line = parsed[0].line
+    caption_node.line = literal_node.line
     container_node += caption_node
     container_node += literal_node
     return container_node

tests/roots/test-intl/literalblock.po

@@ -28,6 +28,9 @@ msgstr "MISSING LITERAL BLOCK::"
 msgid "That's all."
 msgstr "THAT'S ALL."
 
+msgid "included raw.txt"
+msgstr "INCLUDED RAW.TXT"
+
 msgid "code blocks"
 msgstr "CODE-BLOCKS"
 
@@ -40,6 +43,9 @@ msgstr ""
 "   'RESULT'\n"
 "end"
 
+msgid "example of C language"
+msgstr "EXAMPLE OF C LANGUAGE"
+
 msgid ""
 "#include <stdlib.h>\n"
 "int main(int argc, char** argv)\n"

tests/roots/test-intl/literalblock.txt

@@ -12,6 +12,9 @@ Missing literal block::
 
 That's all.
 
+.. literalinclude:: raw.txt
+   :caption: included raw.txt
+
 code blocks
 ==============
 
@@ -32,6 +35,7 @@ code blocks
    }
 
 .. code-block:: c
+   :caption: example of C language
 
    #include <stdio.h>
    int main(int argc, char** argv)

tests/test_intl.py

@@ -452,6 +452,22 @@ def test_gettext_glossary_term_inconsistencies(app):
         assert expect_msg.id in [m.id for m in actual if m.id]
 
 
+@sphinx_intl
+@pytest.mark.sphinx('gettext')
+@pytest.mark.test_params(shared_result='test_intl_gettext')
+def test_gettext_literalblock(app):
+    app.build()
+    # --- gettext builder always ignores ``only`` directive
+    expect = read_po(app.srcdir / 'literalblock.po')
+    actual = read_po(app.outdir / 'literalblock.pot')
+    for expect_msg in [m for m in expect if m.id]:
+        if len(expect_msg.id.splitlines()) == 1:
+            # compare tranlsations only labels
+            assert expect_msg.id in [m.id for m in actual if m.id]
+        else:
+            pass  # skip code-blocks and literalblocks
+
+
 @sphinx_intl
 @pytest.mark.sphinx('gettext')
 @pytest.mark.test_params(shared_result='test_intl_gettext')