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annotate rust/rhg/src/main.rs @ 46445:ca3f73cc3cf4

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rhg: Simplify CommandError based on its use Differential Revision: https://phab.mercurial-scm.org/D9905
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 28 Jan 2021 19:13:55 +0100
parents ead435aa5294
children a6e4e4650bac
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 extern crate log;
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2 use clap::App;
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3 use clap::AppSettings;
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4 use clap::Arg;
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5 use clap::ArgGroup;
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6 use clap::ArgMatches;
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7 use clap::SubCommand;
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8 use format_bytes::format_bytes;
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9 use hg::operations::DebugDataKind;
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10 use std::convert::TryFrom;
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11
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12 mod commands;
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13 mod error;
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14 mod exitcode;
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15 mod ui;
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16 use commands::Command;
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17 use error::CommandError;
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18
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19 fn main() {
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20 env_logger::init();
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21 let app = App::new("rhg")
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22 .setting(AppSettings::AllowInvalidUtf8)
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23 .setting(AppSettings::SubcommandRequired)
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24 .setting(AppSettings::VersionlessSubcommands)
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25 .version("0.0.1")
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26 .subcommand(
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27 SubCommand::with_name("root").about(commands::root::HELP_TEXT),
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28 )
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29 .subcommand(
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30 SubCommand::with_name("files")
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31 .arg(
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32 Arg::with_name("rev")
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33 .help("search the repository as it is in REV")
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34 .short("-r")
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35 .long("--revision")
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36 .value_name("REV")
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37 .takes_value(true),
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38 )
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39 .about(commands::files::HELP_TEXT),
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40 )
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41 .subcommand(
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42 SubCommand::with_name("cat")
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43 .arg(
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44 Arg::with_name("rev")
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45 .help("search the repository as it is in REV")
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46 .short("-r")
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47 .long("--revision")
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48 .value_name("REV")
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49 .takes_value(true),
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50 )
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51 .arg(
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52 clap::Arg::with_name("files")
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53 .required(true)
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54 .multiple(true)
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55 .empty_values(false)
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56 .value_name("FILE")
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57 .help("Activity to start: activity@category"),
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58 )
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59 .about(commands::cat::HELP_TEXT),
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60 )
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61 .subcommand(
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62 SubCommand::with_name("debugdata")
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63 .about(commands::debugdata::HELP_TEXT)
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64 .arg(
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65 Arg::with_name("changelog")
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66 .help("open changelog")
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67 .short("-c")
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68 .long("--changelog"),
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69 )
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70 .arg(
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71 Arg::with_name("manifest")
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72 .help("open manifest")
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73 .short("-m")
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74 .long("--manifest"),
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75 )
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76 .group(
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77 ArgGroup::with_name("")
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78 .args(&["changelog", "manifest"])
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79 .required(true),
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80 )
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81 .arg(
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82 Arg::with_name("rev")
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83 .help("revision")
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84 .required(true)
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85 .value_name("REV"),
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86 ),
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87 )
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88 .subcommand(
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89 SubCommand::with_name("debugrequirements")
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90 .about(commands::debugrequirements::HELP_TEXT),
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91 );
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92
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93 let matches = app.clone().get_matches_safe().unwrap_or_else(|err| {
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94 let _ = ui::Ui::new().writeln_stderr_str(&err.message);
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95 std::process::exit(exitcode::UNIMPLEMENTED)
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96 });
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97
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98 let ui = ui::Ui::new();
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99
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100 let command_result = match_subcommand(matches, &ui);
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101
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102 let exit_code = match command_result {
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103 Ok(_) => exitcode::OK,
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104
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105 // Exit with a specific code and no error message to let a potential
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106 // wrapper script fallback to Python-based Mercurial.
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107 Err(CommandError::Unimplemented) => exitcode::UNIMPLEMENTED,
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108
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109 Err(CommandError::Abort { message }) => {
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110 if !message.is_empty() {
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111 // Ignore errors when writing to stderr, we’re already exiting
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112 // with failure code so there’s not much more we can do.
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113 let _ =
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114 ui.write_stderr(&format_bytes!(b"abort: {}\n", message));
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115 }
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116 exitcode::ABORT
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117 }
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118 };
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119 std::process::exit(exit_code)
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120 }
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121
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122 fn match_subcommand(
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123 matches: ArgMatches,
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124 ui: &ui::Ui,
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125 ) -> Result<(), CommandError> {
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126 match matches.subcommand() {
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127 ("root", _) => commands::root::RootCommand::new().run(&ui),
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128 ("files", Some(matches)) => {
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129 commands::files::FilesCommand::try_from(matches)?.run(&ui)
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130 }
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131 ("cat", Some(matches)) => {
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132 commands::cat::CatCommand::try_from(matches)?.run(&ui)
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133 }
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134 ("debugdata", Some(matches)) => {
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135 commands::debugdata::DebugDataCommand::try_from(matches)?.run(&ui)
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136 }
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137 ("debugrequirements", _) => {
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138 commands::debugrequirements::DebugRequirementsCommand::new()
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139 .run(&ui)
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140 }
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141 _ => unreachable!(), // Because of AppSettings::SubcommandRequired,
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142 }
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143 }
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144
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145 impl<'a> TryFrom<&'a ArgMatches<'_>> for commands::files::FilesCommand<'a> {
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146 type Error = CommandError;
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147
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148 fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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149 let rev = args.value_of("rev");
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150 Ok(commands::files::FilesCommand::new(rev))
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151 }
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152 }
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153
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154 impl<'a> TryFrom<&'a ArgMatches<'_>> for commands::cat::CatCommand<'a> {
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155 type Error = CommandError;
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156
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157 fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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158 let rev = args.value_of("rev");
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159 let files = match args.values_of("files") {
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160 Some(files) => files.collect(),
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161 None => vec![],
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162 };
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163 Ok(commands::cat::CatCommand::new(rev, files))
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164 }
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165 }
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166
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167 impl<'a> TryFrom<&'a ArgMatches<'_>>
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168 for commands::debugdata::DebugDataCommand<'a>
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169 {
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170 type Error = CommandError;
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171
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172 fn try_from(args: &'a ArgMatches) -> Result<Self, Self::Error> {
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173 let rev = args
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174 .value_of("rev")
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175 .expect("rev should be a required argument");
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176 let kind = match (
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177 args.is_present("changelog"),
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178 args.is_present("manifest"),
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179 ) {
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180 (true, false) => DebugDataKind::Changelog,
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181 (false, true) => DebugDataKind::Manifest,
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182 (true, true) => {
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183 unreachable!("Should not happen since options are exclusive")
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184 }
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185 (false, false) => {
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186 unreachable!("Should not happen since options are required")
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187 }
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188 };
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189 Ok(commands::debugdata::DebugDataCommand::new(rev, kind))
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190 }
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191 }