start building doxygen documentation

doc/meson.build

@@ -0,0 +1,16 @@
+cdata.set('TOP_SRCDIR', meson.source_root())
+cdata.set('TOP_BUILDDIR', meson.build_root())
+
+doxyfile = configure_file(input: 'doxygen.conf.in',
+                          output: 'doxygen.conf',
+                          configuration: cdata,
+                          install: false)
+
+datadir = join_paths(get_option('datadir'), 'doc', 'obelisk')
+
+html_target = custom_target('obelisk-docs',
+                            input: doxyfile,
+                            output: 'html',
+                            command: [doxygen, doxyfile],
+                            install: true,
+                            install_dir: datadir)

meson.build

@@ -8,4 +8,20 @@ project('obelisk',
     ]
 )
 
+doxygen = find_program('doxygen', required : false)
+if not doxygen.found()
+    error('MESON_SKIP_TEST doxygen not found.')
+endif
+
+cdata = configuration_data()
+cdata.set('VERSION', meson.project_version())
+
+if find_program('dot', required : false).found()
+    cdata.set('HAVE_DOT', 'YES')
+else
+    cdata.set('HAVE_DOT', 'NO')
+endif
+
+subdir('doc')
+
 subdir('src')