rust/rhg/src/main.rs
author Antoine Cezar <antoine.cezar@octobus.net>
Tue, 15 Sep 2020 16:51:11 +0200
changeset 45542 33ded2d3f4fc
parent 45537 2f8227a12592
child 45923 ead435aa5294
permissions -rw-r--r--
rhg: add a limited `rhg cat -r` subcommand It only supports revision specification (rev or full hash) and the list of files to cat. Differential Revision: https://phab.mercurial-scm.org/D9052
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extern crate log;
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use clap::App;
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use clap::AppSettings;
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use clap::Arg;
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use clap::ArgGroup;
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use clap::ArgMatches;
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use clap::SubCommand;
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use hg::operations::DebugDataKind;
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use std::convert::TryFrom;
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mod commands;
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mod error;
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mod exitcode;
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mod ui;
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use commands::Command;
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use error::CommandError;
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fn main() {
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    env_logger::init();
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    let app = App::new("rhg")
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        .setting(AppSettings::AllowInvalidUtf8)
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        .setting(AppSettings::SubcommandRequired)
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        .setting(AppSettings::VersionlessSubcommands)
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        .version("0.0.1")
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        .subcommand(
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            SubCommand::with_name("root").about(commands::root::HELP_TEXT),
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        )
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        .subcommand(
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            SubCommand::with_name("files")
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                .arg(
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                    Arg::with_name("rev")
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                        .help("search the repository as it is in REV")
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                        .short("-r")
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                        .long("--revision")
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                        .value_name("REV")
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                        .takes_value(true),
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                )
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                .about(commands::files::HELP_TEXT),
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        )
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        .subcommand(
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            SubCommand::with_name("cat")
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                .arg(
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                    Arg::with_name("rev")
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                        .help("search the repository as it is in REV")
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                        .short("-r")
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                        .long("--revision")
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                        .value_name("REV")
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                        .takes_value(true),
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                )
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                .arg(
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                    clap::Arg::with_name("files")
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                        .required(true)
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                        .multiple(true)
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                        .empty_values(false)
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                        .value_name("FILE")
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                        .help("Activity to start: activity@category"),
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                )
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                .about(commands::cat::HELP_TEXT),
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        )
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        .subcommand(
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            SubCommand::with_name("debugdata")
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                .about(commands::debugdata::HELP_TEXT)
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                .arg(
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                    Arg::with_name("changelog")
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                        .help("open changelog")
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                        .short("-c")
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                        .long("--changelog"),
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                )
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                .arg(
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                    Arg::with_name("manifest")
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                        .help("open manifest")
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                        .short("-m")
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                        .long("--manifest"),
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                )
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                .group(
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                    ArgGroup::with_name("")
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                        .args(&["changelog", "manifest"])
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                        .required(true),
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                )
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                .arg(
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                    Arg::with_name("rev")
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                        .help("revision")
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                        .required(true)
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                        .value_name("REV"),
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                ),
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        );
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    let matches = app.clone().get_matches_safe().unwrap_or_else(|err| {
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        let _ = ui::Ui::new().writeln_stderr_str(&err.message);
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        std::process::exit(exitcode::UNIMPLEMENTED_COMMAND)
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    });
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    let ui = ui::Ui::new();
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    let command_result = match_subcommand(matches, &ui);
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    match command_result {
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        Ok(_) => std::process::exit(exitcode::OK),
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        Err(e) => {
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            let message = e.get_error_message_bytes();
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            if let Some(msg) = message {
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                match ui.write_stderr(&msg) {
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                    Ok(_) => (),
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                    Err(_) => std::process::exit(exitcode::ABORT),
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                };
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            };
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            e.exit()
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        }
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    }
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}
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fn match_subcommand(
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    matches: ArgMatches,
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    ui: &ui::Ui,
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) -> Result<(), CommandError> {
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    match matches.subcommand() {
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        ("root", _) => commands::root::RootCommand::new().run(&ui),
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        ("files", Some(matches)) => {
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            commands::files::FilesCommand::try_from(matches)?.run(&ui)
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        }
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        ("cat", Some(matches)) => {
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            commands::cat::CatCommand::try_from(matches)?.run(&ui)
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        }
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        ("debugdata", Some(matches)) => {
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            commands::debugdata::DebugDataCommand::try_from(matches)?.run(&ui)
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        }
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        _ => unreachable!(), // Because of AppSettings::SubcommandRequired,
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    }
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}
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impl<'a> TryFrom<&'a ArgMatches<'_>> for commands::files::FilesCommand<'a> {
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    type Error = CommandError;
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    fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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        let rev = args.value_of("rev");
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        Ok(commands::files::FilesCommand::new(rev))
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    }
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}
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impl<'a> TryFrom<&'a ArgMatches<'_>> for commands::cat::CatCommand<'a> {
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    type Error = CommandError;
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    fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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        let rev = args.value_of("rev");
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        let files = match args.values_of("files") {
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            Some(files) => files.collect(),
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            None => vec![],
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        };
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        Ok(commands::cat::CatCommand::new(rev, files))
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    }
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}
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impl<'a> TryFrom<&'a ArgMatches<'_>>
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    for commands::debugdata::DebugDataCommand<'a>
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{
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    type Error = CommandError;
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   157
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    fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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        let rev = args
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            .value_of("rev")
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            .expect("rev should be a required argument");
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        let kind = match (
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            args.is_present("changelog"),
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            args.is_present("manifest"),
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        ) {
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            (true, false) => DebugDataKind::Changelog,
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            (false, true) => DebugDataKind::Manifest,
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            (true, true) => {
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                unreachable!("Should not happen since options are exclusive")
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            }
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            (false, false) => {
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                unreachable!("Should not happen since options are required")
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            }
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        };
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        Ok(commands::debugdata::DebugDataCommand::new(rev, kind))
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    }
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}