Add CMake project to build documentation

The documentation is compiled from the markdown sources to html using
`pandoc`. In order to install `pandoc` run:

        cabal install pandoc

The documentation build is optional and if `pandoc` is not found during
cmake project configuration the documentation build is skipped.

CMakeLists.txt

@@ -24,6 +24,7 @@ add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} -C ${CMAKE_CFG_INTDIR} --
 
 add_subdirectory (compiler)
 add_subdirectory (cpp)
+add_subdirectory (doc)
 add_python_subdirectory (python)
 add_subdirectory (examples)
 

doc/.pandoc/templates/default.html

@@ -11,9 +11,10 @@ $if(date-meta)$
   <meta name="date" content="$date-meta$" />
 $endif$
   <title>$if(title-prefix)$$title-prefix$ - $endif$$if(pagetitle)$$pagetitle$$endif$</title>
-$if(highlighting-css)$
   <style type="text/css">
+$if(highlighting-css)$
 $highlighting-css$
+$endif$
   body {
       line-height: 1.5; 
       font-family: Helvetica, Arial, sans-serif; 
@@ -77,7 +78,6 @@ $highlighting-css$
   }
   }
   </style>
-$endif$
 $for(css)$
   <link rel="stylesheet" href="$css$" $if(html5)$$else$type="text/css" $endif$/>
 $endfor$

doc/CMakeLists.txt

@@ -0,0 +1,84 @@
+include (CMakeParseArguments)
+include (HaskellUtil)
+
+#
+# add_pandoc_markdown (file.md [file2.md ...] 
+#   [CODE code]
+#   [OUTPUT_DIR dir] 
+#   [OUTPUT_NAME name] 
+#   [TEMPLATE template]
+#   [OPTIONS opt [opt2 ...]])
+#
+function (add_pandoc_markdown)
+    set (flagArgs)
+    set (oneValueArgs OUTPUT_NAME OUTPUT_DIR CODE TEMPLATE)
+    set (multiValueArgs OPTIONS)
+    cmake_parse_arguments (arg "${flagArgs}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN}) 
+    set (options 
+        --standalone
+        --smart
+        --data-dir=.pandoc
+        --highlight-style tango
+        ${arg_OPTIONS})
+    if (arg_TEMPLATE)
+        list(APPEND options --template="${arg_TEMPLATE}")
+    else()
+    endif()
+    if (arg_CODE)
+        list(APPEND options --indented-code-classes="${arg_CODE}")
+    else()
+    endif()
+    set (inputs "${arg_UNPARSED_ARGUMENTS}")
+    foreach (file ${inputs})
+        get_filename_component (name ${file} NAME_WE)
+        if (arg_OUTPUT_NAME)
+            set (outputName ${arg_OUTPUT_NAME})
+        else()
+            set (outputName ${name})
+        endif()
+        set (output "${CMAKE_CURRENT_BINARY_DIR}/html/${arg_OUTPUT_DIR}/${outputName}.html")
+        list (APPEND sources ${file})
+        list (APPEND outputs ${output})
+        add_custom_command(
+            OUTPUT ${output}
+            COMMAND ${Haskell_PANDOC_EXECUTABLE} ${options} --output="${output}" "${file}"
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            DEPENDS ${file} ${PANDOC_EXECUTABLE})
+    endforeach()
+    add_custom_target ("documentation_${name}"
+        DEPENDS ${outputs}
+        SOURCES ${sources})
+    add_dependencies (documentation "documentation_${name}")
+endfunction()    
+
+find_haskell_program (pandoc)
+
+if (Haskell_PANDOC_EXECUTABLE)
+    add_custom_target (documentation)
+
+    add_pandoc_markdown (src/bond_py.md src/bond_cpp.md
+        CODE "cpp,numberLines"
+        OPTIONS --self-contained --table-of-contents
+        OUTPUT_DIR manual)
+
+    add_pandoc_markdown (src/bond_cs.md
+        CODE "cs,numberLines"
+        OPTIONS --self-contained --table-of-contents
+        OUTPUT_DIR manual)
+
+    add_pandoc_markdown (src/reference_index.md
+        CODE "cpp"
+        OPTIONS --self-contained
+        OUTPUT_NAME index
+        OUTPUT_DIR reference)
+
+    add_pandoc_markdown (../readme.md
+        TEMPLATE index.html
+        OUTPUT_NAME index
+        CODE python)
+
+    add_pandoc_markdown (src/why_bond.md
+        TEMPLATE index.html
+        CODE python)
+endif()
+