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Expose default std.log implementation

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This allows root.log implementations to capture log messages, process them, and forward them to the default implementation if desired.
This commit is contained in:
Jonathan Marler 2021-06-24 04:11:28 -06:00
parent 31c49ad64d
commit 642f5df0ab
1 changed files with 32 additions and 19 deletions
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51
lib/std/log.zig
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@ -145,30 +145,43 @@ fn log(
if (@typeInfo(@TypeOf(root.log)) != .Fn)
@compileError("Expected root.log to be a function");
root.log(message_level, scope, format, args);
} else if (std.Target.current.os.tag == .freestanding) {
// On freestanding one must provide a log function; we do not have
// any I/O configured.
return;
} else {
const level_txt = switch (message_level) {
.emerg => "emergency",
.alert => "alert",
.crit => "critical",
.err => "error",
.warn => "warning",
.notice => "notice",
.info => "info",
.debug => "debug",
};
const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
const stderr = std.io.getStdErr().writer();
const held = std.debug.getStderrMutex().acquire();
defer held.release();
nosuspend stderr.print(level_txt ++ prefix2 ++ format ++ "\n", args) catch return;
defaultLog(message_level, scope, format, args);
}
}
}
/// The default implementation for root.log. root.log may forward log messages
/// to this function.
pub fn defaultLog(
comptime message_level: Level,
comptime scope: @Type(.EnumLiteral),
comptime format: []const u8,
args: anytype,
) void {
if (std.Target.current.os.tag == .freestanding) {
// On freestanding one must provide a log function; we do not have
// any I/O configured.
return;
}
const level_txt = switch (message_level) {
.emerg => "emergency",
.alert => "alert",
.crit => "critical",
.err => "error",
.warn => "warning",
.notice => "notice",
.info => "info",
.debug => "debug",
};
const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
const stderr = std.io.getStdErr().writer();
const held = std.debug.getStderrMutex().acquire();
defer held.release();
nosuspend stderr.print(level_txt ++ prefix2 ++ format ++ "\n", args) catch return;
}
/// Returns a scoped logging namespace that logs all messages using the scope
/// provided here.
pub fn scoped(comptime scope: @Type(.EnumLiteral)) type {