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use std::convert::TryFrom;
/// Represents a boolean type.
///
/// We need this newtype in order to implement `TryFrom<String>` and `TryInto<String>`.
/// The `config_key!` macro uses query_string() and update_string().
/// Therefore, boolean needs to be converted from/to String.
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Eq, PartialEq)]
#[serde(transparent)]
pub struct Flag(pub bool);
#[derive(thiserror::Error, Debug)]
#[error("Failed to parse flag: {input}. Supported values are: true, false")]
pub struct InvalidFlag {
input: String,
}
impl TryFrom<String> for Flag {
type Error = InvalidFlag;
fn try_from(input: String) -> Result<Self, Self::Error> {
match input.as_str() {
"true" => Ok(Flag(true)),
"false" => Ok(Flag(false)),
_ => Err(InvalidFlag { input }),
}
}
}
impl From<Flag> for bool {
fn from(value: Flag) -> Self {
value.0
}
}
impl From<Flag> for String {
fn from(value: Flag) -> Self {
match value {
Flag(true) => "true".to_string(),
Flag(false) => "false".to_string(),
}
}
}
impl Flag {
pub fn is_set(&self) -> bool {
self.0
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::convert::TryInto;
#[test]
fn convert_string_true_to_bool_true() {
let input = "true".to_string();
let output: bool = Flag::try_from(input).unwrap().into();
assert!(output);
}
#[test]
fn convert_string_false_to_bool_false() {
let input = "false".to_string();
let output: bool = Flag::try_from(input).unwrap().into();
assert!(!output);
}
#[test]
fn return_error_for_unexpected_string_input() {
let input = "unknown".to_string();
assert!(Flag::try_from(input).is_err());
}
#[test]
fn convert_bool_true_to_string_true() {
let input = true;
let output: String = Flag::try_into(Flag(input)).unwrap();
assert_eq!(output, "true");
}
#[test]
fn convert_bool_false_to_string_false() {
let input = false;
let output: String = Flag::try_into(Flag(input)).unwrap();
assert_eq!(output, "false");
}
}
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