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|
const std = @import("std");
const assert = std.debug.assert;
const Level = std.log.Level;
const unscoped = scoped("");
pub const fatal = unscoped.fatal;
pub const err = unscoped.err;
pub const warn = unscoped.warn;
pub const info = unscoped.info;
pub const debug = unscoped.debug;
pub fn scoped(comptime name: []const u8) type {
const prefix = if (name.len == 0) "" else name ++ ": ";
return struct {
pub fn fatal(comptime msg: []const u8, details: anytype) noreturn {
@branchHint(.cold);
log_structured("FAT", msg, details);
std.process.exit(1);
}
pub fn err(comptime msg: []const u8, details: anytype) void {
@branchHint(.cold);
log(.err, prefix ++ msg, details);
}
pub inline fn warn(comptime msg: []const u8, details: anytype) void {
log(.warn, prefix ++ msg, details);
}
pub inline fn info(comptime msg: []const u8, details: anytype) void {
log(.info, prefix ++ msg, details);
}
pub inline fn debug(comptime msg: []const u8, details: anytype) void {
log(.debug, prefix ++ msg, details);
}
};
}
inline fn log(
comptime level: Level,
comptime msg: []const u8,
details: anytype,
) void {
if (comptime std.log.defaultLogEnabled(level)) {
const level_text = switch (level) {
.err => "ERR",
.warn => "WRN",
.info => "INF",
.debug => "DBG",
};
log_structured(level_text, msg, details);
}
}
fn log_structured(
comptime level: []const u8,
comptime msg: []const u8,
details: anytype,
) void {
comptime {
if (std.mem.indexOfScalar(u8, msg, '"') != null) {
@compileError("double quotation marks not allowed in log message");
}
}
// <level> "a formatted message" {key=val, ...}
const stderr = std.io.getStdErr().writer();
nosuspend {
const message = level ++ " \"" ++ msg ++ "\"";
if (@typeInfo(@TypeOf(details)).@"struct".fields.len > 0) {
stderr.print(message ++ " {}\n", .{structured(details)}) catch return;
} else {
stderr.print(message ++ "\n", .{}) catch return;
}
}
}
fn Structured(comptime T: type) type {
comptime {
assert(@typeInfo(T) == .@"struct");
assert(@typeInfo(T).@"struct".fields.len > 0);
for (@typeInfo(T).@"struct".fields) |field| {
for (field.name) |ch| {
switch (ch) {
'a'...'z', 'A'...'Z', '0'...'9', '_' => {},
else => @compileError("invalid key '" ++ field.name ++ "' in log details"),
}
}
}
}
return struct {
val: T,
inline fn init(val: T) @This() {
return .{ .val = val };
}
pub inline fn format(self: @This(), comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype) !void {
_ = fmt;
_ = options;
try format_structured_struct(self.val, writer);
}
};
}
inline fn structured(value: anytype) Structured(@TypeOf(value)) {
return Structured(@TypeOf(value)).init(value);
}
inline fn format_structured_any(value: anytype, writer: anytype) !void {
const T = @TypeOf(value);
switch (@typeInfo(T)) {
.void => {
try writer.writeAll("void");
},
.bool => {
try writer.writeAll(if (value) "true" else "false");
},
.int => {
try std.fmt.formatIntValue(value, "d", .{}, writer);
},
.float => {
try std.fmt.formatFloatValue(value, "e", .{}, writer);
},
.pointer => |pointer| {
if (pointer.size != .slice) @compileError("cannot log pointers (only slices allowed)");
if (pointer.child == u8) {
try format_structured_string(value, writer);
} else {
try format_structured_sequence(value, writer);
}
},
.array => |array| {
if (array.child == u8) {
try format_structured_string(value, writer);
} else {
try format_structured_sequence(value, writer);
}
},
.@"struct" => {
try format_structured_struct(value, writer);
},
.null => {
try writer.writeAll("null");
},
.optional => {
if (value) |v| {
try format_structured_any(v, writer);
} else {
try writer.writeAll("null");
}
},
.error_set => {
try writer.writeAll(@errorName(value));
},
.@"enum" => {
try format_structured_enum(value, writer);
},
.@"union" => {
try format_structured_union(value, writer);
},
else => @compileError("cannot log type " ++ @typeName(T)),
}
}
fn format_structured_string(value: []const u8, writer: anytype) !void {
try writer.writeAll("\"");
try writer.writeAll(value);
try writer.writeAll("\"");
}
fn format_structured_sequence(value: anytype, writer: anytype) !void {
if (value.len == 0) {
try writer.writeAll("[]");
} else {
try writer.writeAll("[");
try format_structured_any(value[0], writer);
for (value[1..]) |v| {
try writer.writeAll(", ");
try format_structured_any(v, writer);
}
try writer.writeAll("]");
}
}
fn format_structured_struct(value: anytype, writer: anytype) !void {
const struct_info = @typeInfo(@TypeOf(value)).@"struct";
if (struct_info.fields.len == 0) {
try writer.writeAll("{}");
} else {
try writer.writeAll("{ " ++ struct_info.fields[0].name ++ "=");
try format_structured_any(@field(value, struct_info.fields[0].name), writer);
inline for (struct_info.fields[1..]) |field| {
try writer.writeAll(", " ++ field.name ++ "=");
try format_structured_any(@field(value, field.name), writer);
}
try writer.writeAll(" }");
}
}
inline fn format_structured_enum(value: anytype, writer: anytype) !void {
const E = @TypeOf(value);
if (std.meta.hasMethod(E, "format")) {
try value.format("", .{}, writer);
} else if (@typeInfo(E).Enum.is_exhaustive) {
try writer.writeAll(@tagName(value));
} else {
try std.fmt.formatIntValue(@intFromEnum(value), "d", .{}, writer);
}
}
inline fn format_structured_union(value: anytype, writer: anytype) !void {
const U = @TypeOf(value);
if (std.meta.hasMethod(U, "format")) {
try value.format("", .{}, writer);
} else {
@compileError("cannot log union " ++ @typeName(U));
}
}
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