pyrox.dev
1/**
2 * Since Nix does not have a standard location like /usr/share,
3 * where GSettings system could look for schemas, we need to point the software to a correct location somehow.
4 * For executables, we handle this using wrappers but this is not an option for libraries like e-d-s.
5 * Instead, we hardcode the schema path when creating the settings.
6 * A schema path (ie org.gnome.evolution) can be replaced by @EVOLUTION_SCHEMA_PATH@
7 * which is then replaced at build time by substituteAll.
8 * The mapping is provided in a json file ./glib-schema-to-var.json
9 */
10
11@initialize:python@
12@@
13import json
14
15cpp_constants = {}
16
17def register_cpp_constant(const_name, val):
18 cpp_constants[const_name] = val.strip()
19
20def resolve_cpp_constant(const_name):
21 return cpp_constants.get(const_name, const_name)
22
23with open("./glib-schema-to-var.json") as mapping_file:
24 schema_to_var = json.load(mapping_file);
25
26def get_schema_directory(schema_path):
27 # Sometimes the schema id is referenced using C preprocessor #define constant in the same file
28 # let’s try to resolve it first.
29 schema_path = resolve_cpp_constant(schema_path.strip()).strip('"')
30 if schema_path in schema_to_var:
31 return f'"@{schema_to_var[schema_path]}@"'
32 raise Exception(f"Unknown schema path {schema_path!r}, please add it to ./glib-schema-to-var.json")
33
34
35@find_cpp_constants@
36identifier const_name;
37expression val;
38@@
39
40#define const_name val
41
42@script:python record_cpp_constants depends on find_cpp_constants@
43const_name << find_cpp_constants.const_name;
44val << find_cpp_constants.val;
45@@
46
47register_cpp_constant(const_name, val)
48
49
50@depends on ever record_cpp_constants || never record_cpp_constants@
51// We want to run after #define constants have been collected but even if there are no #defines.
52expression SCHEMA_PATH;
53expression settings;
54// Coccinelle does not like autocleanup macros in + sections,
55// let’s use fresh id with concatenation to produce the code as a string.
56fresh identifier schema_source_decl = "g_autoptr(GSettingsSchemaSource) " ## "schema_source";
57fresh identifier schema_decl = "g_autoptr(GSettingsSchema) " ## "schema";
58fresh identifier SCHEMA_DIRECTORY = script:python(SCHEMA_PATH) { get_schema_directory(SCHEMA_PATH) };
59@@
60-settings = g_settings_new(SCHEMA_PATH);
61+{
62+ schema_source_decl;
63+ schema_decl;
64+ schema_source = g_settings_schema_source_new_from_directory(SCHEMA_DIRECTORY,
65+ g_settings_schema_source_get_default(),
66+ TRUE,
67+ NULL);
68+ schema = g_settings_schema_source_lookup(schema_source, SCHEMA_PATH, FALSE);
69+ settings = g_settings_new_full(schema, NULL, NULL);
70+}