31 lines
746 B
Rust
31 lines
746 B
Rust
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pub enum MetaCommand {
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Exit,
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}
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pub enum MetaCommandParseError {
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Unrecognized { cmd: String },
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}
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impl std::fmt::Display for MetaCommandParseError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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MetaCommandParseError::Unrecognized { cmd } => {
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write!(f, "unrecognized meta-command {cmd:?}")
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}
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}
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}
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}
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impl std::str::FromStr for MetaCommand {
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type Err = MetaCommandParseError;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s.trim() {
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".exit" => Ok(MetaCommand::Exit),
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cmd => Err(MetaCommandParseError::Unrecognized {
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cmd: cmd.to_string(),
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}),
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}
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}
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}
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