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use thiserror::Error;
#[derive(Error, Debug)]
pub enum RoadmapError {
#[error("roadmap has no goals, must have exactly one")]
NoGoals,
#[error("too many goals, must have exactly one: found {count:}: {}", .names.join(", "))]
ManyGoals { count: usize, names: Vec<String> },
#[error("step {name:} depends on missing {missing:}")]
MissingDep { name: String, missing: String },
#[error("step is not a mapping")]
StepNotMapping,
#[error("'depends' must be a list of step names")]
DependsNotNames,
#[error("unknown status: {0}")]
UnknownStatus(String),
#[error(transparent)]
SerdeError(#[from] serde_yaml::Error),
}