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@ -1,18 +1,26 @@ |
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use crate::error::ShellError;
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use crate::error::ShellError;
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use once_cell::unsync::Lazy;
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mod cd;
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mod cd;
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mod exit;
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mod exit;
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const BUILTINS: &[&str] = &["exit", "cd"];
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trait Builtin: Sync + Send {
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fn execute(&mut self, args: Vec<String>) -> Result<(), ShellError>;
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}
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const BUILTINS: Lazy<Vec<(&str, Box<dyn Builtin>)>> =
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Lazy::new(|| vec![("cd", Box::new(cd::Cd)), ("exit", Box::new(exit::Exit))]);
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pub fn is_builtin(keyword: &str) -> bool {
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pub fn is_builtin(keyword: &str) -> bool {
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BUILTINS.contains(&keyword)
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BUILTINS.iter().find(|(k, _)| k == &keyword).is_some()
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}
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}
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#[allow(const_item_mutation)]
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pub fn execute_builtin(keyword: &str, args: Vec<String>) -> Result<(), ShellError> {
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pub fn execute_builtin(keyword: &str, args: Vec<String>) -> Result<(), ShellError> {
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match keyword {
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"exit" => exit::run()?,
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"cd" => cd::run(args)?,
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_ => {}
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if let Some(builtin) = BUILTINS
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.iter_mut()
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.find_map(|(k, c)| if k == &keyword { Some(c) } else { None })
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{
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builtin.execute(args)?
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}
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}
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Ok(())
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Ok(())
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}
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}
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