Add a brei-proto.h generated header file

This will be needed to have access to the various disconnect reasons in
brei-shared.c.

meson.build

@@ -70,6 +70,12 @@ dep_libutil = declare_dependency(link_with: lib_util)
 
 proto_c_template = files('src/ei-proto.c.tmpl')
 proto_h_template = files('src/ei-proto.h.tmpl')
+brei_proto_h_template = files('src/brei-proto.h.tmpl')
+
+brei_proto_headers = custom_target('brei-proto-headers',
+                                   input: protocol_xml,
+                                   output: ['brei-proto.h'],
+                                   command: [scanner, '--component=brei', '--output=@OUTPUT@', '@INPUT@', brei_proto_h_template])
 
 ei_proto_headers = custom_target('ei-proto-headers',
                                  input: protocol_xml,
@@ -97,7 +103,7 @@ src_libei = files(
     'src/libei-seat.c',
     'src/libei-socket.c',
     'src/libei-touchscreen.c',
-) + [ei_proto_headers, ei_proto_sources]
+) + [brei_proto_headers, ei_proto_headers, ei_proto_sources]
 
 deps_libei = [
     dep_libutil,
@@ -151,7 +157,7 @@ src_libeis = files(
     'src/libeis-seat.c',
     'src/libeis-socket.c',
     'src/libeis-touchscreen.c',
-) + [eis_proto_headers, eis_proto_sources]
+) + [brei_proto_headers, eis_proto_headers, eis_proto_sources]
 
 lib_libeis = shared_library('eis',
     src_libeis,

proto/ei-scanner

@@ -299,7 +299,7 @@ class Interface:
 
     @classmethod
     def create(cls, name: str, version: int, mode: str = "ei") -> "Interface":
-        assert mode in ["ei", "eis"]
+        assert mode in ["ei", "eis", "brei"]
         return cls(name=name, version=version, mode=mode)
 
 
@@ -577,7 +577,7 @@ def parse(protofile: Path, component: str) -> Protocol:
 def generate_source(
     proto: Protocol, headerfile: Optional[str], template: Path, component: str
 ) -> jinja2.environment.TemplateStream:
-    assert component in ["ei", "eis"]
+    assert component in ["ei", "eis", "brei"]
 
     data = {}
     data["component"] = component
@@ -643,7 +643,7 @@ def main() -> None:
     formatter_class=argparse.RawDescriptionHelpFormatter
     )
 
-    parser.add_argument("--component", type=str, choices=["ei", "eis"], default="ei")
+    parser.add_argument("--component", type=str, choices=["ei", "eis", "brei"], default="ei")
     parser.add_argument(
         "--output", type=str, default="-", help="Output file to write to"
     )

src/brei-proto.h.tmpl

@@ -0,0 +1,46 @@
+/**
+ * GENERATED FILE, DO NOT EDIT
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+{# this is a jinja template, warning above is for the generated file
+
+   Non-obvious variables set by the scanner that are used in this template:
+   - request.fqdn/event.fqdn - the full name of a request/event with the
+     interface name prefixed, "ei_foo_request_bar" or "ei_foo_event_bar"
+   - incoming/outgoing: points to the list of requests or events, depending
+     which one is the outgoing one from the perspective of the file we're
+     generating (ei or eis)
+#}
+
+{# target: because eis is actually eis_client in the code, the target points to
+   either "ei" or "eis_client" and we need the matching get_context or
+   get_client for those. This is specific to the libei/libeis implementation
+   so it's done here in the template only. #}
+{% if component == "eis" %}
+{% set target = { "name":  "eis_client", "context": "client" }  %}
+{% else %}
+{% set target = { "name":  "ei", "context": "context" }  %}
+{% endif %}
+
+#pragma once
+
+#ifdef _cplusplus
+extern "C" {
+#endif
+
+{% for interface in interfaces %}
+{% for enum in interface.enums %}
+enum {{enum.fqdn}} {
+	{% for entry in enum.entries %}
+	{{enum.fqdn.upper()}}_{{entry.name.upper()}} = {{entry.value}},
+	{% endfor %}
+};
+{% endfor %}
+{% endfor %}
+
+#ifdef _cplusplus
+}
+#endif
+