Update TDEL10n module

+ Added the ability to extract strings using extractattr.
+ Added a description of using the tde_create_l10n_template macro.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 451ca41345)

modules/TDEL10n.cmake

@@ -46,6 +46,16 @@ if( NOT DEFINED EXTRACTRC_EXECUTABLE )
   endif( )
 endif( )
 
+if( NOT DEFINED EXTRACTATTR_EXECUTABLE )
+  find_program( EXTRACTATTR_EXECUTABLE
+    NAMES extractattr
+    HINTS "${TDE_PREFIX}/bin"
+  )
+  if( NOT EXTRACTATTR_EXECUTABLE )
+    tde_message_fatal( "extractattr is required but not found" )
+  endif( )
+endif( )
+
 if( NOT DEFINED XGETTEXT_EXECUTABLE )
   find_program( XGETTEXT_EXECUTABLE
     NAMES xgettext
@@ -94,6 +104,10 @@ endfunction( )
 #################################################
 #####
 ##### tde_auto_add_l10n_subdirectories
+#####
+##### The function is equivalent to tde_auto_add_subdirectories, but
+##### the CMakeL10n.txt file is used instead of CMakeLists.txt.
+#####
 
 function( tde_auto_add_l10n_subdirectories )
   file( GLOB _dirs RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/*" )
@@ -110,6 +124,35 @@ endfunction( )
 #################################################
 #####
 ##### tde_create_l10n_template
+#####
+##### Macro is used to generate a translation template - POT file.
+#####
+##### Syntax:
+#####   tde_create_l10n_template(
+#####     CATALOG file_name
+#####     [SOURCES source_spec [source_spec]]
+#####     [KEYWORDS keyword [keyword]]
+#####     [ATTRIBUTES attrib_spec [attrib_spec]]
+#####     [DESTINATION directory]
+#####   )
+#####
+##### Where:
+#####   CATALOG determines the target file name (without pot suffix).
+#####   SOURCES can be specified by several options:
+#####     a) Do not specify anything
+#####      - all usual source files will be automatically searched.
+#####     b) Enter the directory name - for example, '.' or 'src'
+#####      - all the usual source files in the specified directory
+#####        and subdirectories will be searched.
+#####     c) Enter the mask - for example '*.cpp'
+#####      - all files with the specified mask will be searched.
+#####     d) Specify the name of the individual file.
+#####     The methods from b) to d) can be combined.
+#####   KEYWORDS determines additional keywords for xgettext.
+#####   ATTRIBUTES determines files and specification for extractattr:
+#####     source_spec:element,attribute[,context]
+#####   DESTINATION determines directory to save translation template.
+#####
 
 macro( tde_create_l10n_template )
 
@@ -120,6 +163,7 @@ macro( tde_create_l10n_template )
   unset( _desktops )
   unset( _dest )
   unset( _keywords )
+  unset( _attributes )
   unset( _directive )
   unset( _var )
   unset( _pot )
@@ -154,6 +198,13 @@ macro( tde_create_l10n_template )
       set( _directive 1 )
     endif( )
 
+    # found directive "ATTRIBUTES"
+    if( "+${_arg}" STREQUAL "+ATTRIBUTES" )
+      unset( _attributes )
+      set( _var _attributes )
+      set( _directive 1 )
+    endif( )
+
     # collect data
     if( _directive )
       unset( _directive )
@@ -176,7 +227,7 @@ macro( tde_create_l10n_template )
   message( STATUS "Create translation template ${_potFilename}" )
 
   # verify sources
-  if( NOT _sources )
+  if( NOT _sources AND NOT _attributes )
     # add current directory
     list( APPEND _sources "." )
   endif( )
@@ -211,13 +262,13 @@ macro( tde_create_l10n_template )
       list( SORT _add_files )
       list( APPEND _files ${_add_files} )
 
-    # add a single file
+    # add a individual file
     elseif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${_src} )
       list( APPEND _files ${_src} )
     endif( )
 
   endforeach( )
-  if( NOT _files )
+  if( NOT _files AND NOT _attributes )
     tde_message_fatal( "no source files found" )
   endif( )
 
@@ -235,14 +286,44 @@ macro( tde_create_l10n_template )
     endif( )
   endforeach( )
 
+  # prepare extracted-rc.cpp
+  if( _rcs OR _attributes )
+    file( WRITE ${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp "" )
+    list( APPEND _files extracted-rc.cpp )
+  endif( )
+
   # process resource files
   if( _rcs )
     execute_process(
       COMMAND ${EXTRACTRC_EXECUTABLE} ${_rcs}
       WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-      OUTPUT_FILE ${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp
+      OUTPUT_VARIABLE _sources_rc
     )
-    list( APPEND _files extracted-rc.cpp )
+    file( APPEND ${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp ${_sources_rc} )
+  endif( )
+
+  # extract attributes
+  if( _attributes )
+    foreach( _attrib ${_attributes} )
+      if( ${_attrib} MATCHES "^([^:]+):(.+)$" )
+        string( REGEX REPLACE "^([^:]+):(.+)$" "\\1" _attrib_glob ${_attrib} )
+        string( REGEX REPLACE "^([^:]+):(.+)$" "\\2" _attrib_spec ${_attrib} )
+        file( GLOB_RECURSE _attrib_files
+              RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+              ${CMAKE_CURRENT_SOURCE_DIR}/${_attrib_glob}
+        )
+        if( _attrib_files )
+          list( SORT _attrib_files )
+          execute_process(
+            COMMAND ${EXTRACTATTR_EXECUTABLE}
+              --attr=${_attrib_spec} ${_attrib_files}
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            OUTPUT_VARIABLE _attrib_rc
+          )
+          file( APPEND ${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp ${_attrib_rc} )
+        endif( )
+      endif( )
+    endforeach( )
   endif( )
 
   # pick desktop files *.desktop and *.protocol
@@ -312,7 +393,7 @@ macro( tde_create_l10n_template )
   if( _pot )
 
     # update references for resources to original files and line numbers
-    if( _rcs )
+    if( _rcs OR _attributes )
       file( STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp" _extractedRC )
       list( LENGTH _extractedRC _extractedRC_len )
       set( _rcPos 0 )
@@ -346,7 +427,7 @@ macro( tde_create_l10n_template )
   endif( _pot )
 
   # cleanup
-  if( _rcs )
+  if( _rcs OR _attributes )
     file( REMOVE ${CMAKE_CURRENT_SOURCE_DIR}/extracted-rc.cpp )
   endif( )