Struct Context 

pub struct Context<'a> {
    pub cwd: PathBuf,
    pub interactive: bool,
    pub input: &'a mut dyn BufRead,
    pub output: &'a mut dyn Write,
    pub machine: &'a dyn Machine,
}

What a command works with: where it runs, whether it may ask questions, and the machine.

Fields

cwd: PathBuf

interactive: bool

Whether a person can answer questions: a terminal, no agent, no --no-input.

input: &'a mut dyn BufRead

output: &'a mut dyn Write

Where questions and progress go: the terminal, never the result.

machine: &'a dyn Machine