Mercurial > hg-stable
annotate rust/rhg/src/main.rs @ 46631:80840b651721
rhg: Group values passed to every sub-command into a struct
The set of which values this is is evidently not stable yet,
so this will make changes easier. Also it is growing, and the function
signatures are getting out hand.
Differential Revision: https://phab.mercurial-scm.org/D10003
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 15 Feb 2021 20:05:32 +0100 |
parents | 21d3b40b4c0e |
children | 5ce2aa7c2ad5 |
rev | line source |
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1 extern crate log; |
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2 use crate::ui::Ui; |
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3 use clap::App; |
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4 use clap::AppSettings; |
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5 use clap::Arg; |
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6 use clap::ArgMatches; |
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7 use format_bytes::format_bytes; |
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8 use hg::config::Config; |
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9 use std::path::Path; |
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10 |
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11 mod error; |
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13 mod ui; |
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14 use error::CommandError; |
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16 fn add_global_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> { |
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17 app.arg( |
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18 Arg::with_name("repository") |
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19 .help("repository root directory") |
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20 .short("-R") |
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21 .long("--repository") |
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22 .value_name("REPO") |
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23 .takes_value(true), |
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24 ) |
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25 .arg( |
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26 Arg::with_name("config") |
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27 .help("set/override config option (use 'section.name=value')") |
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28 .long("--config") |
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29 .value_name("CONFIG") |
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30 .takes_value(true) |
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31 // Ok: `--config section.key1=val --config section.key2=val2` |
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32 .multiple(true) |
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33 // Not ok: `--config section.key1=val section.key2=val2` |
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34 .number_of_values(1), |
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35 ) |
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36 } |
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37 |
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38 fn main_with_result(ui: &ui::Ui) -> Result<(), CommandError> { |
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39 env_logger::init(); |
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40 let app = App::new("rhg") |
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41 .setting(AppSettings::AllowInvalidUtf8) |
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42 .setting(AppSettings::SubcommandRequired) |
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43 .setting(AppSettings::VersionlessSubcommands) |
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44 .version("0.0.1"); |
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45 let app = add_global_args(app); |
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46 let app = add_subcommand_args(app); |
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47 |
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48 let matches = app.clone().get_matches_safe()?; |
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49 |
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50 let (subcommand_name, subcommand_matches) = matches.subcommand(); |
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51 let run = subcommand_run_fn(subcommand_name) |
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52 .expect("unknown subcommand name from clap despite AppSettings::SubcommandRequired"); |
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53 let subcommand_args = subcommand_matches |
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54 .expect("no subcommand arguments from clap despite AppSettings::SubcommandRequired"); |
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55 |
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56 // Global arguments can be in either based on e.g. `hg -R ./foo log` v.s. |
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57 // `hg log -R ./foo` |
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58 let value_of_global_arg = |name| { |
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59 subcommand_args |
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60 .value_of_os(name) |
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61 .or_else(|| matches.value_of_os(name)) |
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62 }; |
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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 = subcommand_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 config_args = values_of_global_arg("config") |
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72 // `get_bytes_from_path` works for OsStr the same as for Path |
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73 .map(hg::utils::files::get_bytes_from_path); |
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74 let non_repo_config = &hg::config::Config::load(config_args)?; |
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75 |
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76 let repo_path = value_of_global_arg("repository").map(Path::new); |
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77 |
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78 run(&CliInvocation { |
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79 ui, |
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80 subcommand_args, |
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81 non_repo_config, |
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82 repo_path, |
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83 }) |
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84 } |
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85 |
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86 fn main() { |
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87 let ui = Ui::new(); |
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88 |
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89 let exit_code = match main_with_result(&ui) { |
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90 Ok(()) => exitcode::OK, |
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91 |
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92 // Exit with a specific code and no error message to let a potential |
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93 // wrapper script fallback to Python-based Mercurial. |
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94 Err(CommandError::Unimplemented) => exitcode::UNIMPLEMENTED, |
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95 |
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96 Err(CommandError::Abort { message }) => { |
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97 if !message.is_empty() { |
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98 // Ignore errors when writing to stderr, we’re already exiting |
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99 // with failure code so there’s not much more we can do. |
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100 let _ = |
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101 ui.write_stderr(&format_bytes!(b"abort: {}\n", message)); |
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102 } |
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103 exitcode::ABORT |
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104 } |
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105 }; |
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106 std::process::exit(exit_code) |
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108 |
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109 macro_rules! subcommands { |
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110 ($( $command: ident )+) => { |
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111 mod commands { |
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112 $( |
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113 pub mod $command; |
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114 )+ |
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115 } |
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116 |
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117 fn add_subcommand_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> { |
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118 app |
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119 $( |
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120 .subcommand(add_global_args(commands::$command::args())) |
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121 )+ |
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122 } |
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123 |
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124 pub type RunFn = fn(&CliInvocation) -> Result<(), CommandError>; |
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125 |
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126 fn subcommand_run_fn(name: &str) -> Option<RunFn> { |
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127 match name { |
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128 $( |
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129 stringify!($command) => Some(commands::$command::run), |
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130 )+ |
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131 _ => None, |
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132 } |
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133 } |
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134 }; |
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135 } |
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136 |
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137 subcommands! { |
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138 cat |
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139 debugdata |
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140 debugrequirements |
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141 files |
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142 root |
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143 config |
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144 } |
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145 pub struct CliInvocation<'a> { |
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146 ui: &'a Ui, |
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147 subcommand_args: &'a ArgMatches<'a>, |
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148 non_repo_config: &'a Config, |
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149 repo_path: Option<&'a Path>, |
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150 } |