Pass the base url as a build option

So with SoapUI I can pass -Dbase_url=http://localhost:8080

meson_options.txt

@@ -0,0 +1 @@
+option('base_url', type: 'string', value: 'https://api.originsro.org')

src/config.hpp.in

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace duck {
+
+constexpr const char g_base_url[] = "@BASE_URL@";
+
+} //namespace duck

src/main.cpp

@@ -1,8 +1,9 @@
 #include "oro/api.hpp"
+#include "orotool_config.hpp"
 #include <iostream>
 
 int main() {
-	oro::Api oro_api("https://api.originsro.org", "RESTC_CPP", "Testing");
+	oro::Api oro_api(duck::g_base_url, "RESTC_CPP", "Testing");
 	auto ping = oro_api.ping();
 
 	std::cout << "date: " << ping.first.date << '\n';

src/meson.build

@@ -5,11 +5,25 @@ restc_cpp_dep = dependency('restc-cpp', version: '>=0.1.1',
   ],
 )
 
+base_url = get_option('base_url').strip()
+if not base_url.endswith('/')
+  base_url = base_url + '/'
+endif
+
+conf = configuration_data()
+conf.set('BASE_URL', base_url)
+project_config_file = configure_file(
+	input: 'config.hpp.in',
+	output: meson.project_name() + '_config.hpp',
+	configuration: conf,
+)
+
 executable(meson.project_name(),
   'main.cpp',
   'oro/datatypes.cpp',
   'oro/api.cpp',
   'oro/dateconv.cpp',
+  project_config_file,
   install: true,
   dependencies: [restc_cpp_dep],
   include_directories: date_incdir,

subprojects/restc-cpp/include/restc-cpp/meson.build

@@ -1,5 +1,4 @@
 conf = configuration_data()
-
 cpp = meson.get_compiler('cpp')
 
 conf.set('RESTC_CPP_WITH_UNIT_TESTS', get_option('restc_cpp_with_unit_tests') ? 1 : false)