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mod alias;
mod cd;
mod exit;
mod export;
mod source;
use crate::compose::Environment;
use crate::poem::Verse;
/// A static list of all the built-in commands
static INDEX: [&str; 7] = [
"alias", "cd", "exit", "export", "source", "unalias", "unset",
];
/// Lookup the index of a built-in command
///
/// Looks up the index of a built-in command in [INDEX], accounting for aliases.
pub fn lookup(verb: &str) -> Option<usize> {
let verb = match verb {
"quit" => "exit", // Alias 'quit' to 'exit'
"set" => "export", // Alias 'set' to 'export'
_ => verb,
};
INDEX.iter().position(|v| v.to_string() == verb)
}
/// Run a builtin command, based on its verb
///
/// Use [lookup] to check if a verb is in the anthology's index (i.e. is a
/// builtin), then call this with the current verse, the index found by
/// [lookup], and the shell's global environment state.
///
/// # Example
/// ```
/// let index = anthology::lookup(verse.verb());
/// if index.is_some() {
/// anthology::incant(&verse, index.unwrap(), env);
/// } else {
/// // Run an external command
/// ...
/// }
/// ```
pub fn incant(verse: &Verse, index: usize, env: &mut Environment) -> i32 {
let verb = INDEX[index];
match verb {
"alias" => alias::incant(verse, &mut env.aliases),
"cd" => cd::incant(verse),
"exit" => exit::incant(),
"export" => export::incant(verse),
"source" => source::incant(verse, env),
"unalias" => alias::unincant(verse, &mut env.aliases),
"unset" => export::unincant(verse),
_ => unreachable!(),
}
}
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