64 lines
1.7 KiB
Rust
64 lines
1.7 KiB
Rust
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//! Command line (`:`) command parsing.
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//!
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//! To add a command:
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//! 1. Add a `Command` variant.
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//! 2. Recognize it in `parse()` below.
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//! 3. Handle it in `app::cmdline` — live commands (re-evaluated on every
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//! keystroke, like search) in `apply_live`, one-shot commands in `commit`.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Command {
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/// `:/query` — realtime search over artists, releases and tracks.
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Search(String),
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Parsed {
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/// Nothing typed yet.
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Empty,
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Command(Command),
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Unknown(String),
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}
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pub fn parse(input: &str) -> Parsed {
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if input.is_empty() {
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return Parsed::Empty;
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}
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if let Some(query) = input.strip_prefix('/') {
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return Parsed::Command(Command::Search(query.trim().to_string()));
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}
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// Future word commands parse here, e.g. "volume 50" / "seek +30".
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let name = input.split_whitespace().next().unwrap_or(input);
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Parsed::Unknown(name.to_string())
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}
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/// Live commands take effect while typing; one-shot commands run on Enter.
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pub fn is_live(command: &Command) -> bool {
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matches!(command, Command::Search(_))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn parses_search() {
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assert_eq!(
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parse("/daft punk"),
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Parsed::Command(Command::Search("daft punk".to_string()))
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);
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assert_eq!(parse("/"), Parsed::Command(Command::Search(String::new())));
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}
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#[test]
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fn unknown_and_empty() {
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assert_eq!(parse(""), Parsed::Empty);
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assert_eq!(parse("volume 50"), Parsed::Unknown("volume".to_string()));
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}
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#[test]
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fn search_is_live() {
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assert!(is_live(&Command::Search("x".into())));
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}
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}
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