fix: dataframe example should not build if libHipoDataFrame is not …

…installed (#171)

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ defaults:
 
 env:
   hipo_fork: c-dilks/hipo
-  hipo_ref: 4c8325bcf289c5da84f20e6e2b84f9b9ad121447 # for libHipoDataFrame in pkg-config
+  hipo_ref: 3f615258df28295d8dc3c5f02369dbf89dadb9e5 # for libHipoDataFrame in pkg-config
   # test options
   num_events: 1000
   verbose_test: 'false' # only set this to 'true' if `meson test` fails and you need more output to investigate

.gitignore

@@ -1,7 +1,6 @@
 # in-source build artifacts
 /*.ini
-/build*/
-/iguana
+/iguana*/
 /.cache
 
 # doxygen artifacts

examples/meson.build

@@ -12,7 +12,7 @@ example_sources = {
   },
   'iguana-example-02-dataframes': {
     'sources': [ 'iguana-example-02-dataframes.cc' ],
-    'needs_ROOT': true,
+    'build_this': ROOT_dep.found() and hipo_dep_dataframes_found,
   },
   'iguana-example-03-config-files': {
     'sources':   [ 'iguana-example-03-config-files.cc' ],
@@ -22,8 +22,7 @@ example_sources = {
 
 # build executables and test them
 foreach example, info : example_sources
-  example_needs_ROOT = info.get('needs_ROOT', false)
-  if (example_needs_ROOT and ROOT_dep.found()) or not example_needs_ROOT
+  if(info.get('build_this', true))
     example_exe = executable(
       example,
       sources:             info['sources'],

meson.build

@@ -90,6 +90,9 @@ endforeach
 message('Dependency library dirs = [', ', '.join(dep_lib_paths), ']')
 message('Dependency include dirs = [', ', '.join(dep_inc_paths), ']')
 
+# handle HIPO dataframes
+hipo_dep_dataframes_found = hipo_dep.get_variable(pkgconfig: 'with_dataframes', default_value: 'false').to_lower() == 'true'
+
 # handle ROOT
 ROOT_dep_inc_dirs  = []
 ROOT_dep_link_args = []