chore: update clap to v4 with derive API #37
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The settings module is updated. More info is shown in `--help`.
For example, the default value for format is now shown.
The log level stays lowercase in the config file by using a custom serializer/deserializer.
```
Usage: prux [OPTIONS]
Options:
-c, --config <CONFIGFILE>
-l, --level <LOGLEVEL>
-p, --port <LISTENER_PORT>
-u, --uri <SERVER_URI>
-i, --maxmindid <MAXMIND_ID>
-s, --maxmindpass <MAXMIND_PASSWORD>
--save-config <SAVE_CONFIG>
--format <FORMAT> [default: TOML] [possible values: TOML, YAML, JSON]
--show-config
-h, --help Print help
-V, --version Print version
```
LucFauvel
reviewed
Jul 30, 2025
Comment on lines
113
to
+150
| pub struct Settings { | ||
| pub loglevel: String, | ||
| /// The log level. | ||
| /// | ||
| /// It is saved in the configuration file as lowercase. | ||
| #[serde( | ||
| serialize_with = "ser_lowercase", | ||
| deserialize_with = "de_capitalize_first_letter" | ||
| )] | ||
| pub loglevel: LevelFilter, | ||
| pub server: Server, | ||
| pub listener: Listener, | ||
| } | ||
|
|
||
| /// Serializes a value to a lowercase string. | ||
| fn ser_lowercase<S, T>(value: &T, serializer: S) -> result::Result<S::Ok, S::Error> | ||
| where | ||
| S: Serializer, | ||
| T: fmt::Display, | ||
| { | ||
| let s = value.to_string().to_lowercase(); | ||
| serializer.serialize_str(&s) | ||
| } | ||
|
|
||
| fn de_capitalize_first_letter<'de, D, T>(deserializer: D) -> result::Result<T, D::Error> | ||
| where | ||
| D: Deserializer<'de>, | ||
| T: FromStr, | ||
| T::Err: fmt::Display, | ||
| { | ||
| let s = String::deserialize(deserializer)?; | ||
| let mut chars = s.chars(); | ||
| let normalized = match chars.next() { | ||
| Some(f) => f.to_uppercase().collect::<String>() + chars.as_str(), | ||
| None => return Err(serde::de::Error::custom("empty string")), | ||
| }; | ||
| normalized.parse().map_err(serde::de::Error::custom) | ||
| } | ||
|
|
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I'd just use a serde alias here, much simpler. https://serde.rs/field-attrs.html#alias
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It's about lowercasing the value, not the field name. The current version stores it as a lowercase string like info so I wanted to keep it the way it is.
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@allan2 In that case if you want to preserve the previous behavior while using a custom serializer, you should lowercase the rest of the string. As currently we would always toLower the whole string, you could mix and match casing it would work. This would theoretically introduce a breaking change.
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The settings module is updated. More info is shown in
--help.For example, the default value for format is now shown.
The log level stays lowercase in the config file by using a custom serializer/deserializer.