use crate::commands::Command;
use crate::error::CommandError;
use crate::ui::Ui;
use hg::config::Config;
use hg::repo::Repo;

pub const HELP_TEXT: &str = "
Print the current repo requirements.
";

pub struct DebugRequirementsCommand {}

impl DebugRequirementsCommand {
    pub fn new() -> Self {
        DebugRequirementsCommand {}
    }
}

impl Command for DebugRequirementsCommand {
    fn run(&self, ui: &Ui, config: &Config) -> Result<(), CommandError> {
        let repo = Repo::find(config)?;
        let mut output = String::new();
        let mut requirements: Vec<_> = repo.requirements().iter().collect();
        requirements.sort();
        for req in requirements {
            output.push_str(req);
            output.push('\n');
        }
        ui.write_stdout(output.as_bytes())?;
        Ok(())
    }
}