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annotate rust/rhg/src/error.rs @ 46797:bcdcb4423ae3

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rhg: Add more conversions between error types This allows using the `?` operator in more places, as the next commit does. Differential Revision: https://phab.mercurial-scm.org/D10238
author Simon Sapin <simon.sapin@octobus.net>
date Fri, 19 Mar 2021 13:18:53 +0100
parents b1f2c2b336ec
children 821929d59e01
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::ui::utf8_to_local;
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2 use crate::ui::UiError;
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3 use crate::NoRepoInCwdError;
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4 use format_bytes::format_bytes;
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5 use hg::config::{ConfigError, ConfigParseError, ConfigValueParseError};
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6 use hg::errors::HgError;
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7 use hg::repo::RepoError;
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8 use hg::revlog::revlog::RevlogError;
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9 use hg::utils::files::get_bytes_from_path;
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10 use hg::{DirstateError, DirstateMapError, StatusError};
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11 use std::convert::From;
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12
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13 /// The kind of command error
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14 #[derive(Debug)]
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15 pub enum CommandError {
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16 /// Exit with an error message and "standard" failure exit code.
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17 Abort { message: Vec<u8> },
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18
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19 /// Exit with a failure exit code but no message.
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20 Unsuccessful,
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21
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22 /// Encountered something (such as a CLI argument, repository layout, …)
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23 /// not supported by this version of `rhg`. Depending on configuration
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24 /// `rhg` may attempt to silently fall back to Python-based `hg`, which
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25 /// may or may not support this feature.
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26 UnsupportedFeature { message: Vec<u8> },
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27 }
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28
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29 impl CommandError {
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30 pub fn abort(message: impl AsRef<str>) -> Self {
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31 CommandError::Abort {
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32 // TODO: bytes-based (instead of Unicode-based) formatting
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33 // of error messages to handle non-UTF-8 filenames etc:
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34 // https://www.mercurial-scm.org/wiki/EncodingStrategy#Mixing_output
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35 message: utf8_to_local(message.as_ref()).into(),
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36 }
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37 }
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38
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39 pub fn unsupported(message: impl AsRef<str>) -> Self {
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40 CommandError::UnsupportedFeature {
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41 message: utf8_to_local(message.as_ref()).into(),
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42 }
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43 }
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44 }
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45
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46 /// For now we don’t differenciate between invalid CLI args and valid for `hg`
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47 /// but not supported yet by `rhg`.
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48 impl From<clap::Error> for CommandError {
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49 fn from(error: clap::Error) -> Self {
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50 CommandError::unsupported(error.to_string())
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51 }
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52 }
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53
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54 impl From<HgError> for CommandError {
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55 fn from(error: HgError) -> Self {
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56 match error {
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57 HgError::UnsupportedFeature(message) => {
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58 CommandError::unsupported(message)
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59 }
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60 _ => CommandError::abort(error.to_string()),
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61 }
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62 }
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63 }
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64
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65 impl From<ConfigValueParseError> for CommandError {
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66 fn from(error: ConfigValueParseError) -> Self {
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67 CommandError::abort(error.to_string())
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68 }
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69 }
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70
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71 impl From<UiError> for CommandError {
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72 fn from(_error: UiError) -> Self {
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73 // If we already failed writing to stdout or stderr,
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74 // writing an error message to stderr about it would be likely to fail
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75 // too.
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76 CommandError::abort("")
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77 }
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78 }
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79
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80 impl From<RepoError> for CommandError {
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81 fn from(error: RepoError) -> Self {
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82 match error {
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83 RepoError::NotFound { at } => CommandError::Abort {
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84 message: format_bytes!(
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85 b"abort: repository {} not found",
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86 get_bytes_from_path(at)
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87 ),
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88 },
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89 RepoError::ConfigParseError(error) => error.into(),
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90 RepoError::Other(error) => error.into(),
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91 }
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92 }
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93 }
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94
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95 impl<'a> From<&'a NoRepoInCwdError> for CommandError {
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96 fn from(error: &'a NoRepoInCwdError) -> Self {
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97 let NoRepoInCwdError { cwd } = error;
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98 CommandError::Abort {
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99 message: format_bytes!(
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100 b"abort: no repository found in '{}' (.hg not found)!",
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101 get_bytes_from_path(cwd)
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102 ),
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103 }
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104 }
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105 }
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106
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107 impl From<ConfigError> for CommandError {
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108 fn from(error: ConfigError) -> Self {
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109 match error {
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110 ConfigError::Parse(error) => error.into(),
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111 ConfigError::Other(error) => error.into(),
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112 }
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113 }
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114 }
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115
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116 impl From<ConfigParseError> for CommandError {
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117 fn from(error: ConfigParseError) -> Self {
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118 let ConfigParseError {
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119 origin,
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120 line,
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121 message,
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122 } = error;
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123 let line_message = if let Some(line_number) = line {
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124 format_bytes!(b":{}", line_number.to_string().into_bytes())
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125 } else {
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126 Vec::new()
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127 };
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128 CommandError::Abort {
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129 message: format_bytes!(
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130 b"config error at {}{}: {}",
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131 origin,
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132 line_message,
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133 message
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134 ),
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135 }
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136 }
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137 }
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138
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139 impl From<(RevlogError, &str)> for CommandError {
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140 fn from((err, rev): (RevlogError, &str)) -> CommandError {
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141 match err {
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142 RevlogError::InvalidRevision => CommandError::abort(format!(
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143 "abort: invalid revision identifier: {}",
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144 rev
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145 )),
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146 RevlogError::AmbiguousPrefix => CommandError::abort(format!(
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147 "abort: ambiguous revision identifier: {}",
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148 rev
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149 )),
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150 RevlogError::Other(error) => error.into(),
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151 }
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152 }
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153 }
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154
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155 impl From<StatusError> for CommandError {
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156 fn from(error: StatusError) -> Self {
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157 CommandError::abort(format!("{}", error))
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158 }
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159 }
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160
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161 impl From<DirstateMapError> for CommandError {
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162 fn from(error: DirstateMapError) -> Self {
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163 CommandError::abort(format!("{}", error))
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164 }
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165 }
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166
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167 impl From<DirstateError> for CommandError {
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168 fn from(error: DirstateError) -> Self {
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169 match error {
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170 DirstateError::Common(error) => error.into(),
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171 DirstateError::Map(error) => error.into(),
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172 }
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173 }
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174 }