refactor: put top-level binding code in its own dir

meson.build

@@ -172,6 +172,7 @@ add_project_arguments(
 subdir('src/chameleon')
 subdir('src/iguana/services')
 subdir('src/iguana/algorithms')
+subdir('src/iguana/bindings')
 subdir('src/iguana/tests')
 
 # build bindings

src/chameleon/meson.build

@@ -1,6 +1,10 @@
+use_chameleon = get_option('bind_fortran')
+
 chameleon_sources = files(
   'chameleon',
   'src' / 'generator.rb',
   'src' / 'bind_c.rb',
 )
-chameleon_gen = find_program(chameleon_sources[0])
+
+ruby = find_program('ruby', version: '>=3.0.0', required: use_chameleon)
+chameleon_gen = find_program(chameleon_sources[0], required: use_chameleon)

src/chameleon/src/bind_c.rb

@@ -12,8 +12,8 @@ def initialize(out_name='', algo_name='')
 
       #{deterrence_banner 'c'}
 
-      #include "#{@algo_header}"
-      #include "Bindings.h"
+      #include "iguana/algorithms/#{@algo_header}"
+      #include "iguana/bindings/Bindings.h"
 
       namespace iguana::bindings::#{@algo_name.split('::').first} {
         extern "C" {

src/iguana/algorithms/meson.build

@@ -91,8 +91,8 @@ algo_dict = [
 ]
 
 # make lists of objects to build; inclusion depends on whether ROOT is needed or not, and if we have ROOT
-algo_sources = [ 'Algorithm.cc', 'AlgorithmFactory.cc', 'AlgorithmSequence.cc', 'Bindings.cc' ]
-algo_headers = [ 'Algorithm.h', 'AlgorithmBoilerplate.h', 'TypeDefs.h', 'AlgorithmSequence.h', 'Bindings.h' ]
+algo_sources = [ 'Algorithm.cc', 'AlgorithmFactory.cc', 'AlgorithmSequence.cc' ]
+algo_headers = [ 'Algorithm.h', 'AlgorithmBoilerplate.h', 'TypeDefs.h', 'AlgorithmSequence.h' ]
 vdor_sources = [ 'Validator.cc' ]
 vdor_headers = [ 'Validator.h' ]
 algo_configs = []
@@ -126,8 +126,8 @@ foreach algo : algo_dict
       algo_configs += algo_dir / 'Config.yaml'
     endif
 
-    # chameleon targets
-    if algo_has_action_yaml
+    # run chameleon
+    if use_chameleon and algo_has_action_yaml
       target_name = '_'.join([ 'chameleon', algo_name.split('::') ])
       tgt = custom_target(
         target_name,
@@ -195,21 +195,6 @@ vdor_lib = shared_library(
 )
 install_headers(vdor_headers, subdir: meson.project_name() / 'algorithms', preserve_path: true)
 
-# build C bindings
-if get_option('bind_fortran')
-  algo_bind_c_lib = shared_library(
-    'IguanaBindingsC',
-    algo_bind_c_sources,
-    include_directories: [ project_inc ] + ROOT_dep_inc_dirs,
-    dependencies: project_deps,
-    link_with: [ services_lib, algo_lib ],
-    link_args: ROOT_dep_link_args + ROOT_dep_link_args_for_validators,
-    install: true,
-    build_rpath: ROOT_dep_rpath,
-  )
-  project_libs += algo_bind_c_lib
-endif
-
 # install config files
 foreach algo_config : algo_configs
   install_data(algo_config, install_dir: project_etc / 'algorithms', preserve_path: true)

src/iguana/algorithms/Bindings.h → src/iguana/bindings/Bindings.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "Algorithm.h"
+#include "iguana/algorithms/Algorithm.h"
 
 namespace iguana::bindings {
   extern "C" {

src/iguana/bindings/meson.build

@@ -0,0 +1,22 @@
+if use_chameleon
+
+  algo_bind_c_sources += [ 'Bindings.cc' ]
+  algo_bind_c_headers = [ 'Bindings.h' ]
+
+  # build C bindings
+  if get_option('bind_fortran')
+    algo_bind_c_lib = shared_library(
+      'IguanaBindingsC',
+      algo_bind_c_sources,
+      include_directories: [ project_inc ] + ROOT_dep_inc_dirs,
+      dependencies: project_deps,
+      link_with: [ services_lib, algo_lib ],
+      link_args: ROOT_dep_link_args + ROOT_dep_link_args_for_validators,
+      install: true,
+      build_rpath: ROOT_dep_rpath,
+    )
+    project_libs += algo_bind_c_lib
+  endif
+  install_headers(algo_bind_c_headers, subdir: meson.project_name() / 'bindings', preserve_path: true)
+
+endif