config: change default config to use toml-based configuration

toml-config/src/config/parsers/log_level.rs

@@ -0,0 +1,37 @@
+use {
+    crate::{
+        config::parser::{DataType, ParseResult, Parser, UnexpectedDataType},
+        toml::toml_span::{Span, SpannedExt},
+    },
+    jay_config::logging::LogLevel,
+    thiserror::Error,
+};
+
+pub struct LogLevelParser;
+
+#[derive(Debug, Error)]
+pub enum LogLevelParserError {
+    #[error(transparent)]
+    DataType(#[from] UnexpectedDataType),
+    #[error("Unknown log level {0}")]
+    Unknown(String),
+}
+
+impl Parser for LogLevelParser {
+    type Value = LogLevel;
+    type Error = LogLevelParserError;
+    const EXPECTED: &'static [DataType] = &[DataType::String];
+
+    fn parse_string(&mut self, span: Span, string: &str) -> ParseResult<Self> {
+        use LogLevel::*;
+        let level = match string.to_ascii_lowercase().as_str() {
+            "error" => Error,
+            "warn" | "warning" => Warn,
+            "info" => Info,
+            "debug" => Debug,
+            "trace" => Trace,
+            _ => return Err(LogLevelParserError::Unknown(string.to_string()).spanned(span)),
+        };
+        Ok(level)
+    }
+}