1 files changed, 33 insertions, 0 deletions
diff --git a/trace/ctx.ha b/trace/ctx.ha
new file mode 100644
index 0000000..26a1ce6
--- /dev/null
+++ b/trace/ctx.ha
@@ -0,0 +1,33 @@
+use fmt;
+
+export type ctxtracer = struct {
+	tracer,
+	sink: *tracer,
+	fmt: str,
+	fields: []fmt::field,
+};
+
+export fn ctx(sink: *tracer, fmt: str, fields: fmt::field...) ctxtracer = {
+	return ctxtracer {
+		log = &ctx_log,
+		sink = sink,
+		fmt = fmt,
+		fields = fields,
+	};
+};
+
+fn ctx_log(
+	tr: *tracer,
+	ctx: nullable *context,
+	lvl: level,
+	fmt: str,
+	fields: fmt::field...
+) void = {
+	const tr = tr: *ctxtracer;
+	const ctx_ = context {
+		fmt = tr.fmt,
+		fields = tr.fields,
+		next = ctx,
+	};
+	log(tr.sink, &ctx_, lvl, fmt, fields...);
+};