From 350a4291ce52270e19ee68bb1e711d892e77c4c9 Mon Sep 17 00:00:00 2001
From: Slávek Banko <slavek.banko@axis.cz>
Date: Wed, 27 May 2020 18:49:05 +0200
Subject: tde_create_handbook: Add an optional SOURCE_BASEDIR argument.
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Using the optional SOURCE_BASEDIR argument, it is possible to use
tde_create_handbook in CMakeLists.txt from a folder other than the
folder containing the documentation itself.

This will allow the creation of common rules for generating documentation
for all languages that are currently available, without the need to
create CMakeLists.txt in the directory of each individual language.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit f7a3d5c3e272cbb059f96b90a2555506c9a6b454)
---
 modules/TDEMacros.cmake | 49 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 7 deletions(-)

diff --git a/modules/TDEMacros.cmake b/modules/TDEMacros.cmake
index c750856..81dd62a 100644
--- a/modules/TDEMacros.cmake
+++ b/modules/TDEMacros.cmake
@@ -1957,12 +1957,20 @@ macro( tde_create_handbook )
   unset( _extra )
   unset( _srcdir )
 
+  get_filename_component( _source_basedir "${CMAKE_CURRENT_SOURCE_DIR}" ABSOLUTE )
   set( _lang en )
   set( _first_arg 1 )
   set( _var _target )
 
   foreach( _arg ${ARGN} )
 
+    # found directive "SOURCE_BASEDIR"
+    if( "+${_arg}" STREQUAL "+SOURCE_BASEDIR" )
+      unset( _source_basedir )
+      set( _var _source_basedir )
+      set( _directive 1 )
+    endif()
+
     # found directive "NOINDEX"
     if( "+${_arg}" STREQUAL "+NOINDEX" )
       set( _noindex 1 )
@@ -2019,6 +2027,16 @@ macro( tde_create_handbook )
 
   endforeach()
 
+  # if source_basedir is relative, complete the path to absolute
+  if( NOT IS_ABSOLUTE ${_source_basedir} )
+    get_filename_component( _source_basedir "${_source_basedir}" ABSOLUTE )
+  endif()
+
+  # prepare the binary directory according to source_basedir
+  file( RELATIVE_PATH _binary_basedir "${CMAKE_CURRENT_SOURCE_DIR}" "${_source_basedir}" )
+  set( _binary_basedir "${CMAKE_CURRENT_BINARY_DIR}/${_binary_basedir}" )
+  file( MAKE_DIRECTORY "${_binary_basedir}" )
+
   # if no target specified, try to guess it from DESTINATION
   if( NOT _target )
     if( NOT _dest )
@@ -2029,9 +2047,24 @@ macro( tde_create_handbook )
 
   set( _target "${_target}-${_lang}-handbook" )
 
+  # if sources are listed, complete the path to absolute
+  if( _srcs )
+    foreach( _src ${_srcs} )
+      if( NOT IS_ABSOLUTE ${_src} )
+        list( REMOVE_ITEM _srcs ${_src} )
+        get_filename_component( _src "${_source_basedir}/${_src}" ABSOLUTE )
+        list( APPEND _srcs ${_src} )
+      endif()
+    endforeach()
+  endif()
+
   # if no file specified, include all docbooks, stylesheets and images
   if( NOT _srcs )
-    file( GLOB _srcs RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.docbook *.css *.png  )
+    file( GLOB _srcs
+      ${_source_basedir}/*.docbook
+      ${_source_basedir}/*.css
+      ${_source_basedir}/*.png
+    )
   endif()
 
   # if no destination specified, defaulting to HTML_INSTALL_DIR
@@ -2050,7 +2083,7 @@ macro( tde_create_handbook )
   if( NOT _noindex )
 
     # check for index.docbook
-    list( FIND _srcs "index.docbook" _find_index )
+    list( FIND _srcs "${_source_basedir}/index.docbook" _find_index )
     if( -1 EQUAL _find_index )
       tde_message_fatal( "missing index.docbook file" )
     endif()
@@ -2061,14 +2094,16 @@ macro( tde_create_handbook )
     endif()
 
     add_custom_command(
-      OUTPUT index.cache.bz2
-      COMMAND ${KDE3_MEINPROC_EXECUTABLE} ${_srcdir} --check --cache index.cache.bz2 ${CMAKE_CURRENT_SOURCE_DIR}/index.docbook
+      OUTPUT ${_binary_basedir}/index.cache.bz2
+      COMMAND ${KDE3_MEINPROC_EXECUTABLE} ${_srcdir} --check --cache index.cache.bz2 ${_source_basedir}/index.docbook
       COMMENT "Generating ${_target}"
-      DEPENDS ${_srcs} )
+      DEPENDS ${_srcs}
+      WORKING_DIRECTORY "${_binary_basedir}"
+    )
 
-    add_custom_target( ${_target} ALL DEPENDS index.cache.bz2 )
+    add_custom_target( ${_target} ALL DEPENDS ${_binary_basedir}/index.cache.bz2 )
 
-    list( APPEND _srcs ${CMAKE_CURRENT_BINARY_DIR}/index.cache.bz2 )
+    list( APPEND _srcs ${_binary_basedir}/index.cache.bz2 )
 
     if( NOT TDE_HTML_DIR )
       set( TDE_HTML_DIR ${HTML_INSTALL_DIR} )
-- 
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