Created
August 23, 2024 18:24
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zig scoped logging poc using the type system
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| const std = @import("std"); | |
| pub fn main() void { | |
| const logger: Logger = .{}; | |
| logger.log("starting the app"); | |
| const stuff = Stuff.init(logger); | |
| stuff.doStuff(); | |
| } | |
| const Stuff = struct { | |
| logger: ScopedLogger("stuff"), | |
| pub fn init(logger: Logger) @This() { | |
| return .{ .logger = logger.withScope("stuff") }; | |
| } | |
| pub fn doStuff(self: @This()) void { | |
| self.logger.log("doing stuff"); | |
| const child = StuffChild.init(self.logger.unscoped()); | |
| child.doStuffDetails(); | |
| } | |
| }; | |
| const StuffChild = struct { | |
| logger: ScopedLogger("stuff-child"), | |
| pub fn init(logger: Logger) @This() { | |
| return .{ .logger = logger.withScope("stuff-child") }; | |
| } | |
| pub fn doStuffDetails(self: @This()) void { | |
| self.logger.log("doing stuff details"); | |
| } | |
| }; | |
| const Logger = ScopedLogger(null); | |
| fn ScopedLogger(scope: ?[]const u8) type { | |
| return struct { | |
| fn unscoped(_: @This()) Logger { | |
| return .{}; | |
| } | |
| fn withScope(_: @This(), comptime new_scope: anytype) ScopedLogger(new_scope) { | |
| return .{}; | |
| } | |
| fn log(_: @This(), message: []const u8) void { | |
| if (scope) |scope_str| { | |
| std.debug.print("{s} - {s}\n", .{ scope_str, message }); | |
| } else { | |
| std.debug.print("{s}\n", .{message}); | |
| } | |
| } | |
| }; | |
| } |
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