35d24b51f5
glib expression is messy enough as is. Also rename the `glib-schema-to-var` argument to `schemaIdToVariableMapping` to better match Nixpkgs coding style.
71 lines
2.7 KiB
Plaintext
71 lines
2.7 KiB
Plaintext
/**
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* Since Nix does not have a standard location like /usr/share,
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* where GSettings system could look for schemas, we need to point the software to a correct location somehow.
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* For executables, we handle this using wrappers but this is not an option for libraries like e-d-s.
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* Instead, we hardcode the schema path when creating the settings.
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* A schema path (ie org.gnome.evolution) can be replaced by @EVOLUTION_SCHEMA_PATH@
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* which is then replaced at build time by substituteAll.
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* The mapping is provided in a json file ./glib-schema-to-var.json
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*/
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@initialize:python@
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@@
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import json
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cpp_constants = {}
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def register_cpp_constant(const_name, val):
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cpp_constants[const_name] = val.strip()
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def resolve_cpp_constant(const_name):
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return cpp_constants.get(const_name, const_name)
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with open("./glib-schema-to-var.json") as mapping_file:
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schema_to_var = json.load(mapping_file);
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def get_schema_directory(schema_path):
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# Sometimes the schema id is referenced using C preprocessor #define constant in the same file
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# let’s try to resolve it first.
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schema_path = resolve_cpp_constant(schema_path.strip()).strip('"')
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if schema_path in schema_to_var:
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return f'"@{schema_to_var[schema_path]}@"'
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raise Exception(f"Unknown schema path {schema_path!r}, please add it to ./glib-schema-to-var.json")
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@find_cpp_constants@
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identifier const_name;
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expression val;
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@@
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#define const_name val
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@script:python record_cpp_constants depends on find_cpp_constants@
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const_name << find_cpp_constants.const_name;
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val << find_cpp_constants.val;
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@@
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register_cpp_constant(const_name, val)
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@depends on ever record_cpp_constants || never record_cpp_constants@
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// We want to run after #define constants have been collected but even if there are no #defines.
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expression SCHEMA_PATH;
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expression settings;
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// Coccinelle does not like autocleanup macros in + sections,
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// let’s use fresh id with concatenation to produce the code as a string.
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fresh identifier schema_source_decl = "g_autoptr(GSettingsSchemaSource) " ## "schema_source";
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fresh identifier schema_decl = "g_autoptr(GSettingsSchema) " ## "schema";
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fresh identifier SCHEMA_DIRECTORY = script:python(SCHEMA_PATH) { get_schema_directory(SCHEMA_PATH) };
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@@
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-settings = g_settings_new(SCHEMA_PATH);
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+{
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+ schema_source_decl;
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+ schema_decl;
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+ schema_source = g_settings_schema_source_new_from_directory(SCHEMA_DIRECTORY,
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+ g_settings_schema_source_get_default(),
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+ TRUE,
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+ NULL);
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+ schema = g_settings_schema_source_lookup(schema_source, SCHEMA_PATH, FALSE);
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+ settings = g_settings_new_full(schema, NULL, NULL);
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+}
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