rhg: add a limited `rhg files` subcommand

Differential Revision: https://phab.mercurial-scm.org/D8869

rust/rhg/src/main.rs

@@ -1,53 +1,57 b''
 use clap::App;
 use clap::AppSettings;
 use clap::SubCommand;
 
 mod commands;
 mod error;
 mod exitcode;
 mod ui;
 use commands::Command;
 
 fn main() {
     let mut app = App::new("rhg")
         .setting(AppSettings::AllowInvalidUtf8)
         .setting(AppSettings::SubcommandRequired)
         .setting(AppSettings::VersionlessSubcommands)
         .version("0.0.1")
         .subcommand(
             SubCommand::with_name("root").about(commands::root::HELP_TEXT),
+        )
+        .subcommand(
+            SubCommand::with_name("files").about(commands::files::HELP_TEXT),
         );
 
     let matches = app.clone().get_matches_safe().unwrap_or_else(|_| {
         std::process::exit(exitcode::UNIMPLEMENTED_COMMAND)
     });
 
     let ui = ui::Ui::new();
 
     let command_result = match matches.subcommand_name() {
         Some(name) => match name {
             "root" => commands::root::RootCommand::new(&ui).run(),
+            "files" => commands::files::FilesCommand::new(&ui).run(),
             _ => std::process::exit(exitcode::UNIMPLEMENTED_COMMAND),
         },
         _ => {
             match app.print_help() {
                 Ok(_) => std::process::exit(exitcode::OK),
                 Err(_) => std::process::exit(exitcode::ABORT),
             };
         }
     };
 
     match command_result {
         Ok(_) => std::process::exit(exitcode::OK),
         Err(e) => {
             let message = e.get_error_message_bytes();
             if let Some(msg) = message {
                 match ui.write_stderr(&msg) {
                     Ok(_) => (),
                     Err(_) => std::process::exit(exitcode::ABORT),
                 };
             };
             e.exit()
         }
     }
 }