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//! Failures and exit codes.
//!
//! The DX pillar splits the audience in two, and this is the agent's half: a
//! quiet, scriptable CLI with a different exit code per reason. A script has
//! to be able to tell "cannot close yet" from "you typed the command wrong"
//! without reading the prose.
use crate::redact::Finding;
pub enum Failure {
/// The model refuses the operation. There is only one such rule today:
/// closing with open blockers. `MODEL.md` ยง7.
Model(String),
/// The command is malformed.
Usage(String),
/// The redaction guard. Security pillar.
Redaction(Box<Finding>),
/// There is no `.vivac/` here or further up.
NoStore,
Io(std::io::Error),
}
pub type R = Result<(), Failure>;
impl Failure {
pub fn code(&self) -> i32 {
match self {
Failure::Model(_) => 1,
Failure::Usage(_) => 2,
Failure::Redaction(_) => 3,
Failure::NoStore => 4,
Failure::Io(_) => 5,
}
}
pub fn print_to_stderr(&self) {
eprintln!();
match self {
Failure::Model(m) | Failure::Usage(m) => eprintln!("{m}"),
Failure::Redaction(h) => eprintln!("{h}"),
Failure::NoStore => {
eprintln!(" No .vivac/ here or further up.");
eprintln!();
eprintln!(" Plant the tree: vivac init");
}
Failure::Io(e) => eprintln!(" Input/output error: {e}"),
}
eprintln!();
}
pub fn usage(m: impl Into<String>) -> Failure {
Failure::Usage(format!(" {}", m.into()))
}
}
impl From<std::io::Error> for Failure {
fn from(e: std::io::Error) -> Failure {
Failure::Io(e)
}
}