annotate rust/rhg/src/main.rs @ 46557:a25033eb43b5

rhg: add limited support for the `config` sub-command Only with one argument and no flag. This is mostly for testing. Differential Revision: https://phab.mercurial-scm.org/D9972
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 08 Feb 2021 23:41:58 +0100
parents 2e5dd18d6dc3
children 21d3b40b4c0e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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::ArgMatches;
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6 use format_bytes::format_bytes;
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7 use std::path::Path;
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8
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9 mod error;
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10 mod exitcode;
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11 mod ui;
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12 use error::CommandError;
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13
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14 fn add_global_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
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15 app.arg(
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16 Arg::with_name("repository")
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17 .help("repository root directory")
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18 .short("-R")
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19 .long("--repository")
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20 .value_name("REPO")
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21 .takes_value(true),
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22 )
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23 .arg(
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24 Arg::with_name("config")
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25 .help("set/override config option (use 'section.name=value')")
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26 .long("--config")
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27 .value_name("CONFIG")
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28 .takes_value(true)
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29 // Ok: `--config section.key1=val --config section.key2=val2`
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30 .multiple(true)
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31 // Not ok: `--config section.key1=val section.key2=val2`
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32 .number_of_values(1),
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33 )
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34 }
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35
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36 fn main() {
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37 env_logger::init();
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38 let app = App::new("rhg")
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39 .setting(AppSettings::AllowInvalidUtf8)
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40 .setting(AppSettings::SubcommandRequired)
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41 .setting(AppSettings::VersionlessSubcommands)
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42 .version("0.0.1");
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43 let app = add_global_args(app);
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44 let app = add_subcommand_args(app);
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45
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46 let ui = ui::Ui::new();
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47
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48 let matches = app.clone().get_matches_safe().unwrap_or_else(|err| {
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49 let _ = ui.writeln_stderr_str(&err.message);
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50 std::process::exit(exitcode::UNIMPLEMENTED)
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51 });
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52
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53 let (subcommand_name, subcommand_matches) = matches.subcommand();
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54 let run = subcommand_run_fn(subcommand_name)
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55 .expect("unknown subcommand name from clap despite AppSettings::SubcommandRequired");
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56 let args = subcommand_matches
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57 .expect("no subcommand arguments from clap despite AppSettings::SubcommandRequired");
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58
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59 // Global arguments can be in either based on e.g. `hg -R ./foo log` v.s.
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60 // `hg log -R ./foo`
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61 let value_of_global_arg =
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62 |name| args.value_of_os(name).or_else(|| matches.value_of_os(name));
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63 // For arguments where multiple occurences are allowed, return a
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64 // possibly-iterator of all values.
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65 let values_of_global_arg = |name: &str| {
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66 let a = matches.values_of_os(name).into_iter().flatten();
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67 let b = args.values_of_os(name).into_iter().flatten();
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68 a.chain(b)
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69 };
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70
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71 let repo_path = value_of_global_arg("repository").map(Path::new);
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72 let result = (|| -> Result<(), CommandError> {
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73 let config_args = values_of_global_arg("config")
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74 // `get_bytes_from_path` works for OsStr the same as for Path
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75 .map(hg::utils::files::get_bytes_from_path);
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76 let config = hg::config::Config::load(config_args)?;
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77 run(&ui, &config, repo_path, args)
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78 })();
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79
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80 let exit_code = match result {
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81 Ok(_) => exitcode::OK,
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82
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83 // Exit with a specific code and no error message to let a potential
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84 // wrapper script fallback to Python-based Mercurial.
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85 Err(CommandError::Unimplemented) => exitcode::UNIMPLEMENTED,
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86
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87 Err(CommandError::Abort { message }) => {
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88 if !message.is_empty() {
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89 // Ignore errors when writing to stderr, we’re already exiting
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90 // with failure code so there’s not much more we can do.
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91 let _ =
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92 ui.write_stderr(&format_bytes!(b"abort: {}\n", message));
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93 }
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94 exitcode::ABORT
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95 }
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96 };
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97 std::process::exit(exit_code)
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98 }
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99
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100 macro_rules! subcommands {
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101 ($( $command: ident )+) => {
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102 mod commands {
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103 $(
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104 pub mod $command;
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105 )+
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106 }
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107
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108 fn add_subcommand_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
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109 app
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110 $(
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111 .subcommand(add_global_args(commands::$command::args()))
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112 )+
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113 }
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114
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115 fn subcommand_run_fn(name: &str) -> Option<fn(
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116 &ui::Ui,
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117 &hg::config::Config,
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118 Option<&Path>,
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119 &ArgMatches,
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120 ) -> Result<(), CommandError>> {
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121 match name {
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122 $(
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123 stringify!($command) => Some(commands::$command::run),
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124 )+
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125 _ => None,
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126 }
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127 }
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128 };
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129 }
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130
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131 subcommands! {
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132 cat
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133 debugdata
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134 debugrequirements
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135 files
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136 root
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137 config
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138 }