supplement a from_str for FmtSpan

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/log/fmt_span.rs

@@ -0,0 +1,17 @@
+use tracing_subscriber::fmt::format::FmtSpan;
+
+use crate::Result;
+
+#[inline]
+pub fn from_str(str: &str) -> Result<FmtSpan, FmtSpan> {
+	match str.to_uppercase().as_str() {
+		"ENTER" => Ok(FmtSpan::ENTER),
+		"EXIT" => Ok(FmtSpan::EXIT),
+		"NEW" => Ok(FmtSpan::NEW),
+		"CLOSE" => Ok(FmtSpan::CLOSE),
+		"ACTIVE" => Ok(FmtSpan::ACTIVE),
+		"FULL" => Ok(FmtSpan::FULL),
+		"NONE" => Ok(FmtSpan::NONE),
+		_ => Err(FmtSpan::NONE),
+	}
+}

src/core/log/mod.rs

@@ -1,6 +1,7 @@
 pub mod capture;
 pub mod color;
 pub mod fmt;
+pub mod fmt_span;
 mod reload;
 mod suppress;