[!300] Allow grid analysis with custom analyzing executable

Merge branch 'feature/enhanced-analyze-grid' into 'master'

ref:extensions/dune-codegen @rhess You might want to have a look. I changed
the naming scheme of the csv file as well to make sure it is always written to
the build directory.

See merge request [extensions/dune-codegen!300]

  [extensions/dune-codegen!300]: gitlab.dune-project.org/extensions/dune-codegen/merge_requests/300

cmake/modules/DuneCodegenMacros.cmake

@@ -45,6 +45,27 @@
 #       Set this option, if you do not want the target to be automatically
 #       built. This option is forwarded to the builtin command add_executable.
 #
+#    .. cmake_param:: ANALYZE_GRID
+#       :option:
+#
+#       Set this option to enable code generation time grid analysis.
+#       This is useful to reduce the variety of sum factorization kernels
+#       in unstructured grids. Note that the grid analysis tool needs to
+#       be able to construct your grid from the given inifile. If you have
+#       a custom grid construction method, you can use ANALYZE_GRID_COMMAND
+#       instead.
+#
+#    .. cmake_param:: ANALYZE_GRID_COMMAND
+#       :multi:
+#       :argname command:
+#
+#       Use this to pass a custom grid analysis command. This is necessary
+#       if you use a custom grid generation methdod. The inifile and the
+#       outputfile will be appended to this command. You can use the analysis code in
+#       dune/codegen/sumfact/analyzegrid.hh to write your own tool.
+#       Specifying this option will automatically set ANALYZE_GRID.
+#
+#
 #    Add an executable to the project that gets automatically
 #    generated at configure time with the form compiler uf2pdelab.
 #    Regeneration is triggered correctly if the UFL file or the
@@ -73,7 +94,7 @@ file(GLOB_RECURSE UFL2PDELAB_SOURCES ${UFL2PDELAB_GLOB_PATTERN})
 function(add_generated_executable)
   set(OPTIONS EXCLUDE_FROM_ALL ANALYZE_GRID)
   set(SINGLE TARGET SOURCE UFLFILE INIFILE)
-  set(MULTI FORM_COMPILER_ARGS DEPENDS)
+  set(MULTI FORM_COMPILER_ARGS DEPENDS ANALYZE_GRID_COMMAND)
   include(CMakeParseArguments)
   cmake_parse_arguments(GEN "${OPTIONS}" "${SINGLE}" "${MULTI}" ${ARGN})
 
@@ -114,6 +135,12 @@ function(add_generated_executable)
   else()
     set(GEN_EXCLUDE_FROM_ALL "")
   endif()
+  if(GEN_ANALYZE_GRID_COMMAND)
+    set(GEN_ANALYZE_GRID 1)
+  else()
+    dune_module_path(MODULE dune-codegen RESULT codegenbin BUILD_DIR)
+    set(GEN_ANALYZE_GRID_COMMAND ${codegenbin}/bin/analyzegrid/analyze_grid)
+  endif()
 
   # Process analyze grid option
   set(ANALYZE_GRID_FILE)
@@ -122,10 +149,10 @@ function(add_generated_executable)
     if(NOT consistent-edge-orientation_FOUND)
       message(FATAL_ERROR "Asked for grid analysis, but the module consistent-edge-orientation was not found!")
     endif()
-    set(ANALYZE_GRID_FILE "${GEN_INIFILE}.csv")
+    set(ANALYZE_GRID_FILE "${CMAKE_CURRENT_BINARY_DIR}/${GEN_TARGET}.csv")
     set(ANALYZE_GRID_OPTION "--grid-info=${ANALYZE_GRID_FILE}")
     add_custom_command(OUTPUT ${ANALYZE_GRID_FILE}
-                       COMMAND ${CMAKE_BINARY_DIR}/bin/analyzegrid/analyze_grid ${GEN_INIFILE} ${ANALYZE_GRID_FILE}
+                       COMMAND ${GEN_ANALYZE_GRID_COMMAND} ${GEN_INIFILE} ${ANALYZE_GRID_FILE}
                        COMMENT "Analyzing the grid for target ${GEN_TARGET}..."
                        )
   endif()

dune/codegen/sumfact/analyzegrid.hh

 #ifndef DUNE_CODEGEN_SUMFACT_ANALYZEGRID_HH
 #define DUNE_CODEGEN_SUMFACT_ANALYZEGRID_HH
 
+#include<fstream>
+#include<set>
+#include<string>
 
 #include <dune/pdelab/common/intersectiontype.hh>