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/**
* Since Nix does not have a standard location like /usr/share,
* where GSettings system could look for schemas, we need to point the software to a correct location somehow.
* For executables, we handle this using wrappers but this is not an option for libraries like e-d-s.
* Instead, we hardcode the schema path when creating the settings.
* A schema path (ie org.gnome.evolution) can be replaced by @EVOLUTION_SCHEMA_PATH@
* which is then replaced at build time by substituteAll.
* The mapping is provided in a json file ./glib-schema-to-var.json
*/
@initialize:python@
@@
import json
cpp_constants = {}
def register_cpp_constant(const_name, val):
cpp_constants[const_name] = val.strip()
def resolve_cpp_constant(const_name):
return cpp_constants.get(const_name, const_name)
with open("./glib-schema-to-var.json") as mapping_file:
schema_to_var = json.load(mapping_file);
def get_schema_directory(schema_path):
# Sometimes the schema id is referenced using C preprocessor #define constant in the same file
# let’s try to resolve it first.
schema_path = resolve_cpp_constant(schema_path.strip()).strip('"')
if schema_path in schema_to_var:
return f'"@{schema_to_var[schema_path]}@"'
raise Exception(f"Unknown schema path {schema_path!r}, please add it to ./glib-schema-to-var.json")
@find_cpp_constants@
identifier const_name;
expression val;
@@
#define const_name val
@script:python record_cpp_constants depends on find_cpp_constants@
const_name << find_cpp_constants.const_name;
val << find_cpp_constants.val;
@@
register_cpp_constant(const_name, val)
@depends on ever record_cpp_constants || never record_cpp_constants@
// We want to run after #define constants have been collected but even if there are no #defines.
expression SCHEMA_PATH;
expression settings;
// Coccinelle does not like autocleanup macros in + sections,
// let’s use fresh id with concatenation to produce the code as a string.
fresh identifier schema_source_decl = "g_autoptr(GSettingsSchemaSource) " ## "schema_source";
fresh identifier schema_decl = "g_autoptr(GSettingsSchema) " ## "schema";
fresh identifier SCHEMA_DIRECTORY = script:python(SCHEMA_PATH) { get_schema_directory(SCHEMA_PATH) };
@@
-settings = g_settings_new(SCHEMA_PATH);
+{
+ schema_source_decl;
+ schema_decl;
+ schema_source = g_settings_schema_source_new_from_directory(SCHEMA_DIRECTORY,
+ g_settings_schema_source_get_default(),
+ TRUE,
+ NULL);
+ schema = g_settings_schema_source_lookup(schema_source, SCHEMA_PATH, FALSE);
+ settings = g_settings_new_full(schema, NULL, NULL);
+}
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