From a81515cba8b6d79513f70f5062f1c2e9c416549b Mon Sep 17 00:00:00 2001
From: Meghan Denny <hello@nektro.net>
Date: Sun, 9 Jul 2023 13:42:19 -0700
Subject: [PATCH] add LoggingReader

---
 src/lib.zig | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/lib.zig b/src/lib.zig
index 4aa8a5c66eaaae4ae6cf796105556b358ee113aa..f24e5b07325b35d9cfe36c0d8b71e2e16d5839b1 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -561,3 +561,30 @@ pub fn FieldUnion(comptime T: type) type {
         .decls = &.{},
     } });
 }
+
+pub fn LoggingReader(comptime T: type, comptime scope: @Type(.EnumLiteral)) type {
+    return struct {
+        child_stream: T,
+
+        pub const Error = T.Error;
+        pub const Reader = std.io.Reader(Self, Error, read);
+
+        const Self = @This();
+
+        pub fn init(child_stream: T) Self {
+            return .{
+                .child_stream = child_stream,
+            };
+        }
+
+        pub fn reader(self: Self) Reader {
+            return .{ .context = self };
+        }
+
+        fn read(self: Self, dest: []u8) Error!usize {
+            const n = try self.child_stream.read(dest);
+            std.log.scoped(scope).debug("{s}", .{dest[0..n]});
+            return n;
+        }
+    };
+}
-- 
2.54.0