Add prefix (le_) for man pages

This will:
- avoid overlapping (since there is util.h.3 page)
- group everything under some prefix (man le_<TAB><TAB> will show everything)

Fixes: #1099

cmake/RenameDoxygen.cmake

@@ -0,0 +1,17 @@
+# Add prefix "le_" for manual pages
+
+message(STATUS "Rename man pages in ${CMAKE_BINARY_DIR}")
+
+# Remove old pages to avoid stalled copies
+file(GLOB LIBEVENT_MAN_PAGES RELATIVE ${CMAKE_BINARY_DIR} le_*)
+list(LENGTH LIBEVENT_MAN_PAGES LEN)
+if (${LEN} GREATER 0)
+    file(REMOVE ${LIBEVENT_MAN_PAGES})
+endif()
+
+# Create new
+file(GLOB LIBEVENT_MAN_PAGES RELATIVE ${CMAKE_BINARY_DIR} *)
+list(FILTER LIBEVENT_MAN_PAGES EXCLUDE REGEX ^le_.*$)
+foreach(MAN_PAGE ${LIBEVENT_MAN_PAGES})
+  file(RENAME ${CMAKE_BINARY_DIR}/${MAN_PAGE} ${CMAKE_BINARY_DIR}/le_${MAN_PAGE})
+endforeach()

cmake/UseDoxygen.cmake

@@ -95,10 +95,17 @@ macro(UseDoxygen)
         )
       endif()
 
-      # Install manual into <prefix>/share/man/man3
       if ("${DOXYGEN_GENERATE_MAN}" STREQUAL "YES")
+        set(MAN_PAGES_DIR ${PROJECT_BINARY_DIR}/${DOXYGEN_OUTPUT_DIRECTORY}/man/man3)
+        # Add prefix "le_" for manual pages
+        add_custom_target(doxygen-rename-man-pages ALL
+          COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/RenameDoxygen.cmake
+          DEPENDS doxygen
+          WORKING_DIRECTORY ${MAN_PAGES_DIR})
+
+        # Install manual into <prefix>/share/man/man3
         install(DIRECTORY
-          ${PROJECT_BINARY_DIR}/${DOXYGEN_OUTPUT_DIRECTORY}/man/man3
+          ${MAN_PAGES_DIR}
           DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man
           COMPONENT doc
         )

doxygen.am

@@ -18,9 +18,31 @@ clean-local:
 	-rm -rf $(DX_CLEANFILES)
 
 if ENABLE_DOXYGEN_MAN
+man3_MAN_DIR = @DX_DOCDIR@/man/man3
+
+# add "le_" prefix for man pages
+#
+# XXX: we cannot clean old man pages here since
+# doxygen-rename-man-pages will be called twice:
+# - for make
+# - for make install
+# (cmake works differently)
+#
+# Once this will be solved add the following to the target:
+#
+#     -rm -fr $(man3_MAN_DIR)/le_*
+doxygen-rename-man-pages: doxygen-doc
+	echo "Rename man pages in $(man3_MAN_DIR)"
+	@for p in $(man3_MAN_DIR)/*; do \
+	  p=`basename $$p`; \
+	  p_strip=$${p/le_/}; \
+	  if [ ! "$$p_strip" = "$$p" ]; then continue; fi; \
+	  mv '$(man3_MAN_DIR)/'$$p '$(man3_MAN_DIR)/'le_$$p; \
+	done
+
 # integrate doxygen with automake targets
-man3_MANS = @DX_DOCDIR@/man/man3/*
+man3_MANS = $(man3_MAN_DIR)/*
-$(man3_MANS): doxygen-doc
+$(man3_MANS): doxygen-doc doxygen-rename-man-pages
 endif ENABLE_DOXYGEN_MAN
 
 # Docs will be installed. It may be one or more docs supported