Improve installation of documentation files

- Install info version of ledger documentation instead of the original
  texinfo sources

- Install html version of ledger documentation when BUILD_WEB_DOCS is ON

- Enable installation of documentation files from --output directory

acprep

@@ -875,6 +875,9 @@ class PrepareBuild(CommandLineApp):
         if self.options.boost_include:
             conf_args.append('-DBOOST_INCLUDEDIR=%s' %
                              self.options.boost_include)
+        if self.options.build_dir:
+            conf_args.append('-DBUILD_DIR=%s' %
+                             self.options.build_dir)
 
         if self.prefix_directory():
             conf_args.append('-DCMAKE_INSTALL_PREFIX=%s' % self.prefix_directory())

doc/CMakeLists.txt

@@ -120,8 +120,19 @@ endif(CMAKE_INSTALL_MANDIR)
 foreach(file ${info_files})
   get_filename_component(file_base ${file} NAME_WE)
 
-  install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${file}
+  if (CMAKE_SOURCE_DIR STREQUAL BUILD_DIR)
+    set(doc_dir CMAKE_CURRENT_SOURCE_DIR)
+  else()
+    get_filename_component(dir_base ${CMAKE_CURRENT_SOURCE_DIR} NAME_WE)
+    set(doc_dir "${CMAKE_SOURCE_DIR}/${BUILD_DIR}/${dir_base}")
+  endif()
+
+  install(FILES ${doc_dir}/${file_base}.info
     DESTINATION ${CMAKE_INSTALL_INFODIR} COMPONENT doc)
-  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${file_base}.pdf
+  install(FILES ${doc_dir}/${file_base}.pdf
     DESTINATION ${CMAKE_INSTALL_DOCDIR} COMPONENT doc OPTIONAL)
+  if (BUILD_WEB_DOCS)
+    install(FILES ${doc_dir}/${file_base}.html
+      DESTINATION ${CMAKE_INSTALL_DOCDIR} COMPONENT doc)
+  endif(BUILD_WEB_DOCS)
 endforeach()