comparison rust/rhg/src/commands/debugrequirements.rs @ 45924:a2eda1ff22aa

requirements: move loading to hg-core and add parsing

No functional change, checking comes later.

Differential Revision: https://phab.mercurial-scm.org/D9398

45923:ead435aa5294

use crate::commands::Command;
use crate::error::{CommandError, CommandErrorKind};
use crate::ui::Ui;
use hg::operations::FindRoot;

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

}

impl Command for DebugRequirementsCommand {
    fn run(&self, ui: &Ui) -> Result<(), CommandError> {
        let root = FindRoot::new().run()?;
        let requires = root.join(".hg").join("requires");
        let requirements = match std::fs::read(requires) {
            Ok(bytes) => bytes,

            // Treat a missing file the same as an empty file.
            // From `mercurial/localrepo.py`:
            // > requires file contains a newline-delimited list of
            // > features/capabilities the opener (us) must have in order to use
            // > the repository. This file was introduced in Mercurial 0.9.2,
            // > which means very old repositories may not have one. We assume
            // > a missing file translates to no requirements.
            Err(error) if error.kind() == std::io::ErrorKind::NotFound => Vec::new(),

            Err(error) => Err(CommandErrorKind::FileError(error))?,
        };

        ui.write_stdout(&requirements)?;
        Ok(())
    }
}

45924:a2eda1ff22aa

use crate::commands::Command;
use crate::error::CommandError;
use crate::ui::Ui;
use hg::operations::FindRoot;
use hg::requirements;

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

}

impl Command for DebugRequirementsCommand {
    fn run(&self, ui: &Ui) -> Result<(), CommandError> {
        let root = FindRoot::new().run()?;
        let mut output = String::new();
        for req in requirements::load(&root)? {
            output.push_str(&req);
            output.push('\n');
        }
        ui.write_stdout(output.as_bytes())?;
        Ok(())
    }
}