Re: broken ..epigraph in XeTeX?

On 2017-02-04, Alan G. Isaac wrote:
> On 2/4/2017 11:51 AM, Matěj Cepl wrote:
>>     \begin{quote}
>>     \DUrole{epigraph}{
>>     Co je nejvyšším cílem člověka?

>>     Nejvyšším cílem člověka je oslavovat Boha a věčně se z Něj
>>     radovat.
>>     \nopagebreak

>>     \raggedleft —Westminsterský katechismus, 1647
>>     }
>>     \end{quote}



> Is this another abuse of the ``quote`` environment
> to accomplish indentation?

No. See the description of the "epigraph" directive.

Docutils converts it to 

    <block_quote classes="epigraph">

and currently handling of block-quotes and some other environments with
classes is broken. 

This will be fixed soon.

> If so, this again compromises the ability to separately style quotes
> and other content (in this case, epigraphs).

Not if the class arguments are handled correctly.

> Note that the ``changepage`` package provides ``adjustwidth``.
> E.g., one could define
> \newenvironment{DUepigraph}%
> {\begin{adjustwidth}{2cm}{}}%
> {\end{adjustwidth}}

> Other default formatting could be added as desired.
> This approach would allow authors to readily modify
> the ``epigraph`` environment (with ``renewenvironment``)
> without interfering with other environments.

> The ``quote`` environment is for (one paragraph) quotes.
> It is not a general indentation facility.
> https://en.wikibooks.org/wiki/LaTeX/Paragraph_Formatting#Quoting_text

Both "quote" and "quotation" provide for multiple paragraphs.
(Just try it.)

The error originates in the \DUrole definition with \providecommand*,
the star makes this check for paragraph breaks in the argument.


Patch attached.

Günter

Dir: docutils-svn/docutils/docutils/writers/latex2e/

Index: __init__.py
===================================================================
--- __init__.py	(Revision 8020)
+++ __init__.py	(Arbeitskopie)
@@ -494,6 +494,7 @@
 PreambleCmds.align_center = r"""
 \makeatletter
 \@namedef{DUrolealign-center}{\centering}
+\@namedef{DUclassalign-center}{\centering}
 \makeatother
 """
 
@@ -512,6 +513,15 @@
 % dedication topic
 \providecommand{\DUtopicdedication}[1]{\begin{center}#1\end{center}}"""
 
+PreambleCmds.DUclass = r"""
+% class handling for environments (block-level elements)
+% \DUclass{#1} tries \DUrole#1
+\providecommand{\DUclass}[1]{%
+  \ifcsname DUclass#1\endcsname%
+    \csname DUclass#1\endcsname%
+  \fi%
+}"""
+
 PreambleCmds.error = r"""
 % error admonition title
 \providecommand*{\DUtitleerror}[1]{\DUtitle{\color{red}#1}}"""
@@ -1568,6 +1578,19 @@
             labels.insert(0, '\\phantomsection')
         return labels
 
+    def insert_DUclass_macros(self, node):
+        for cls in node['classes']:
+            if cls == 'align-center':
+                self.fallbacks['align-center'] = PreambleCmds.align_center
+            if cls.startswith('language-'):
+                language = self.babel.language_name(cls[9:])
+                if language:
+                    self.babel.otherlanguages[language] = True
+                    self.out.append('\\selectlanguage{%s}%\n' % language)
+            else:
+                self.fallbacks['DUclass'] = PreambleCmds.DUclass
+                self.out.append('\\DUclass{%s}%%\n' % cls)
+
     def push_output_collector(self, new_out):
         self.out_stack.append(self.out)
         self.out = new_out
@@ -1631,12 +1654,9 @@
 
     def visit_block_quote(self, node):
         self.out.append( '%\n\\begin{quote}\n')
-        if node['classes']:
-            self.visit_inline(node)
+        self.insert_DUclass_macros(node)
 
     def depart_block_quote(self, node):
-        if node['classes']:
-            self.depart_inline(node)
         self.out.append( '\n\\end{quote}\n')
 
     def visit_bullet_list(self, node):
@@ -1644,12 +1664,9 @@
             self.out.append( '%\n\\begin{list}{}{}\n' )
         else:
             self.out.append( '%\n\\begin{itemize}\n' )
-        # if node['classes']:
-        #     self.visit_inline(node)
+        self.insert_DUclass_macros(node)
 
     def depart_bullet_list(self, node):
-        # if node['classes']:
-        #     self.depart_inline(node)
         if self.is_toc_list:
             self.out.append( '\n\\end{list}\n' )
         else:
@@ -1813,6 +1830,7 @@
 
     def visit_definition_list(self, node):
         self.out.append( '%\n\\begin{description}\n' )
+        self.insert_DUclass_macros(node)
 
     def depart_definition_list(self, node):
         self.out.append( '\\end{description}\n' )
@@ -2093,11 +2111,11 @@
         if 'start' in node:
             self.out.append('\\setcounter{%s}{%d}\n' %
                             (counter_name,node['start']-1))
+        self.insert_DUclass_macros(node)
         #     ## set rightmargin equal to leftmargin
         #     self.out.append('\\setlength{\\rightmargin}{\\leftmargin}\n')
 
 
-
     def depart_enumerated_list(self, node):
         if len(self._enumeration_counters) <= 4:
             self.out.append('\\end{enumerate}\n')
@@ -2130,6 +2148,7 @@
         if self.out is not self.docinfo:
             self.fallbacks['fieldlist'] = PreambleCmds.fieldlist
             self.out.append('%\n\\begin{DUfieldlist}\n')
+        self.insert_DUclass_macros(node)
 
     def depart_field_list(self, node):
         if self.out is not self.docinfo:
@@ -2163,6 +2182,7 @@
             self.out.append('\n\\begin{figure}\n')
         if node.get('ids'):
             self.out += self.ids_to_labels(node) + ['\n']
+        self.insert_DUclass_macros(node)
 
     def depart_figure(self, node):
         self.out.append('\\end{figure}\n')
@@ -2391,14 +2411,9 @@
                              '\\begin{DUlineblock}{\\DUlineblockindent}\n')
         else:
             self.out.append('\n\\begin{DUlineblock}{0em}\n')
-        if node['classes']:
-            self.visit_inline(node)
-            self.out.append('\n')
+        self.insert_DUclass_macros(node)
 
     def depart_line_block(self, node):
-        if node['classes']:
-            self.depart_inline(node)
-            self.out.append('\n')
         self.out.append('\\end{DUlineblock}\n')
 
     def visit_list_item(self, node):
@@ -2576,6 +2591,7 @@
         self.fallbacks['_providelength'] = PreambleCmds.providelength
         self.fallbacks['optionlist'] = PreambleCmds.optionlist
         self.out.append('%\n\\begin{DUoptionlist}\n')
+        self.insert_DUclass_macros(node)
 
     def depart_option_list(self, node):
         self.out.append('\n\\end{DUoptionlist}\n')
@@ -2731,6 +2747,7 @@
         self.requirements['color'] = PreambleCmds.color
         self.fallbacks['sidebar'] = PreambleCmds.sidebar
         self.out.append('\n\\DUsidebar{\n')
+        self.insert_DUclass_macros(node)
 
     def depart_sidebar(self, node):
         self.out.append('}\n')


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