Modified latex template to include bare minimum of packages.

Packages will be included only if they are needed, given what
is in the document.  So if you never use strikeout, you don't
need to install the ulem package.

Also moved amsmath to the top of the package list, made
\maketitle conditional on a title being present, and
adjusted spacing.

git-svn-id: https://pandoc.googlecode.com/svn/trunk@1738 788f1e2b-df1e-0410-8736-df70ead52e1b

2 files changed, 72 insertions, 19 deletions

diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index 2da632798..f66278379 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -39,16 +39,27 @@ import Control.Monad (liftM)
 import Text.PrettyPrint.HughesPJ hiding ( Str )
 
 data WriterState = 
-  WriterState { stInNote   :: Bool          -- @True@ if we're in a note
-              , stOLLevel  :: Int           -- level of ordered list nesting
-              , stOptions  :: WriterOptions -- writer options, so they don't have to be parameter 
+  WriterState { stInNote     :: Bool          -- @True@ if we're in a note
+              , stOLLevel    :: Int           -- level of ordered list nesting
+              , stOptions    :: WriterOptions -- writer options, so they don't have to be parameter 
+              , stVerbInNote :: Bool          -- true if document has verbatim text in note
+              , stEnumerate  :: Bool          -- true if document needs fancy enumerated lists
+              , stTable      :: Bool          -- true if document has a table
+              , stStrikeout  :: Bool          -- true if document has strikeout
+              , stSubscript  :: Bool          -- true if document has subscript
+              , stLink       :: Bool          -- true if document has links
+              , stUrl        :: Bool          -- true if document has visible URL link
+              , stGraphics   :: Bool          -- true if document contains images
               }
 
 -- | Convert Pandoc to LaTeX.
 writeLaTeX :: WriterOptions -> Pandoc -> String
 writeLaTeX options document = 
   evalState (pandocToLaTeX options document) $ 
-  WriterState { stInNote = False, stOLLevel = 1, stOptions = options } 
+  WriterState { stInNote = False, stOLLevel = 1, stOptions = options,
+                stVerbInNote = False, stEnumerate = False,
+                stTable = False, stStrikeout = False, stSubscript = False,
+                stLink = False, stUrl = False, stGraphics = False } 
 
 pandocToLaTeX :: WriterOptions -> Pandoc -> State WriterState String
 pandocToLaTeX options (Pandoc (Meta title authors date) blocks) = do
@@ -63,12 +74,22 @@ pandocToLaTeX options (Pandoc (Meta title authors date) blocks) = do
                  then empty
                  else text $ writerIncludeAfter options
   let main = render $ before $$ body $$ after
+  st <- get
   let context  = writerVariables options ++
                  [ ("toc", if writerTableOfContents options then "yes" else "")
                  , ("body", main)
                  , ("title", titletext)
                  , ("date", dateText) ] ++
-                 [ ("author", a) | a <- authorsText ]
+                 [ ("author", a) | a <- authorsText ] ++
+                 [ ("xetex", "yes") | writerXeTeX options ] ++
+                 [ ("verbatim-in-note", "yes") | stVerbInNote st ] ++
+                 [ ("fancy-enums", "yes") | stEnumerate st ] ++
+                 [ ("tables", "yes") | stTable st ] ++
+                 [ ("strikeout", "yes") | stStrikeout st ] ++
+                 [ ("subscript", "yes") | stSubscript st ] ++
+                 [ ("links", "yes") | stLink st ] ++
+                 [ ("url", "yes") | stUrl st ] ++
+                 [ ("graphics", "yes") | stGraphics st ]
   return $ if writerStandalone options
               then renderTemplate context $ writerTemplate options
               else main
@@ -117,12 +138,14 @@ blockToLaTeX (BlockQuote lst) = do
   return $ text "\\begin{quote}" $$ contents $$ text "\\end{quote}"
 blockToLaTeX (CodeBlock (_,classes,_) str) = do
   st <- get
-  let env = if writerLiterateHaskell (stOptions st) && "haskell" `elem` classes &&
+  env <- if writerLiterateHaskell (stOptions st) && "haskell" `elem` classes &&
                     "literate" `elem` classes
-               then "code"
-               else if stInNote st
-                       then "Verbatim"
-                       else "verbatim"
+            then return "code"
+            else if stInNote st
+                    then do
+                      modify $ \s -> s{ stVerbInNote = True }
+                      return "Verbatim"
+                    else return "verbatim"
   return $ text ("\\begin{" ++ env ++ "}\n") <> text str <> 
            text ("\n\\end{" ++ env ++ "}")
 blockToLaTeX (RawHtml _) = return empty
@@ -135,11 +158,13 @@ blockToLaTeX (OrderedList (start, numstyle, numdelim) lst) = do
   put $ st {stOLLevel = oldlevel + 1}
   items <- mapM listItemToLaTeX lst
   modify (\s -> s {stOLLevel = oldlevel})
-  let exemplar = if numstyle /= DefaultStyle || numdelim /= DefaultDelim
-                    then char '[' <> 
-                          text (head (orderedListMarkers (1, numstyle,
-                               numdelim))) <> char ']'
-                    else empty
+  exemplar <- if numstyle /= DefaultStyle || numdelim /= DefaultDelim
+                 then do
+                   modify $ \s -> s{ stEnumerate = True }
+                   return $ char '[' <> 
+                       text (head (orderedListMarkers (1, numstyle,
+                            numdelim))) <> char ']'
+                 else return empty
   let resetcounter = if start /= 1 && oldlevel <= 4
                         then text $ "\\setcounter{enum" ++ 
                              map toLower (toRomanNumeral oldlevel) ++
@@ -179,6 +204,7 @@ blockToLaTeX (Table caption aligns widths heads rows) = do
                   headers $$ text "\\hline" $$ vcat rows' $$ 
                   text "\\end{tabular}" 
   let centered txt = text "\\begin{center}" $$ txt $$ text "\\end{center}"
+  modify $ \s -> s{ stTable = True }
   return $ if isEmpty captionText
               then centered tableBody <> char '\n'
               else text "\\begin{table}[h]" $$ centered tableBody $$ 
@@ -237,10 +263,12 @@ inlineToLaTeX (Strong lst) =
   inlineListToLaTeX (deVerb lst) >>= return . inCmd "textbf" 
 inlineToLaTeX (Strikeout lst) = do
   contents <- inlineListToLaTeX $ deVerb lst
+  modify $ \s -> s{ stStrikeout = True }
   return $ inCmd "sout" contents
-inlineToLaTeX (Superscript lst) = 
+inlineToLaTeX (Superscript lst) =
   inlineListToLaTeX (deVerb lst) >>= return . inCmd "textsuperscript"
 inlineToLaTeX (Subscript lst) = do
+  modify $ \s -> s{ stSubscript = True }
   contents <- inlineListToLaTeX $ deVerb lst
   -- oddly, latex includes \textsuperscript but not \textsubscript
   -- so we have to define it (using a different name so as not to conflict with memoir class):
@@ -250,6 +278,8 @@ inlineToLaTeX (SmallCaps lst) =
 inlineToLaTeX (Cite _ lst) =
   inlineListToLaTeX lst
 inlineToLaTeX (Code str) = do
+  st <- get
+  when (stInNote st) $ modify $ \s -> s{ stVerbInNote = True }
   let chr = ((enumFromTo '!' '~') \\ str) !! 0
   return $ text $ "\\verb" ++ [chr] ++ str ++ [chr]
 inlineToLaTeX (Quoted SingleQuote lst) = do
@@ -282,13 +312,16 @@ inlineToLaTeX (HtmlInline _) = return empty
 inlineToLaTeX (LineBreak) = return $ text "\\\\" 
 inlineToLaTeX Space = return $ char ' '
 inlineToLaTeX (Link txt (src, _)) = do
+  modify $ \s -> s{ stLink = True }
   case txt of
         [Code x] | x == src ->  -- autolink
-             do return $ text $ "\\url{" ++ x ++ "}"
+             do modify $ \s -> s{ stUrl = True }
+                return $ text $ "\\url{" ++ x ++ "}"
         _ -> do contents <- inlineListToLaTeX $ deVerb txt
                 return $ text ("\\href{" ++ src ++ "}{") <> contents <> 
                          char '}'
-inlineToLaTeX (Image _ (source, _)) =
+inlineToLaTeX (Image _ (source, _)) = do
+  modify $ \s -> s{ stGraphics = True }
   return $ text $ "\\includegraphics{" ++ source ++ "}" 
 inlineToLaTeX (Note contents) = do
   st <- get
diff --git a/templates/latex.template b/templates/latex.template
index 121537ef5..5441694cf 100644
--- a/templates/latex.template
+++ b/templates/latex.template
@@ -14,22 +14,40 @@ $endif$
 \setlength{\parindent}{0pt}
 \setlength{\parskip}{6pt plus 2pt minus 1pt}
 $endif$
+$if(verbatim-in-note)$
 \usepackage{fancyvrb}
+$endif$
+$if(fancy-enums)$
 \usepackage{enumerate}
+$endif$
+$if(tables)$
 \usepackage{array}
 % This is needed because raggedright in table elements redefines \\:
 \newcommand{\PreserveBackslash}[1]{\let\temp=\\#1\let\\=\temp}
 \let\PBS=\PreserveBackslash
+$endif$
+$if(strikeout)$
 \usepackage[normalem]{ulem}
+$endif$
+$if(subscript)$
 \newcommand{\textsubscr}[1]{\ensuremath{_{\scriptsize\textrm{#1}}}}
+$endif$
+$if(links)$
 \usepackage[breaklinks=true]{hyperref}
+$endif$
+$if(url)$
 \usepackage{url}
+$endif$
+$if(graphics)$
 \usepackage{graphicx}
-\VerbatimFootnotes % allows verbatim text in footnotes
+$endif$
 $if(numbersections)$
 $else$
 \setcounter{secnumdepth}{0}
 $endif$
+$if(verbatim-in-note)$
+\VerbatimFootnotes % allows verbatim text in footnotes
+$endif$
 $for(header-includes)$
 $header-includes$
 $endfor$
@@ -43,7 +61,9 @@ $if(date)$
 $endif$
 
 \begin{document}
+$if(title)$
 \maketitle
+$endif$
 
 $if(toc)$
 \tableofcontents