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annotate rust/rhg/src/ui.rs @ 52760:94e2547e6f3d

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rust: move code from utils to utils::strings This moves string-related functions in hg::utils into the recently added hg::utils::strings module.
author Mitchell Kember <mkember@janestreet.com>
date Thu, 16 Jan 2025 13:15:02 -0500
parents bbf1c52252ae
children 6183949219b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use crate::color::ColorConfig;
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2 use crate::color::Effect;
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3 use crate::error::CommandError;
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4 use format_bytes::format_bytes;
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5 use format_bytes::write_bytes;
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6 use hg::config::Config;
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7 use hg::config::PlainInfo;
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8 use hg::encoding::Encoder;
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9 use hg::errors::HgError;
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10 use hg::filepatterns::PatternFileWarning;
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11 use hg::repo::Repo;
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12 use hg::sparse;
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13 use hg::utils::files::get_bytes_from_path;
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14 use std::io;
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15 use std::io::BufWriter;
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16 use std::io::IsTerminal;
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17 use std::io::StdoutLock;
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18 use std::io::{ErrorKind, Write};
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19
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20 pub struct Ui {
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21 stdout: std::io::Stdout,
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22 stderr: std::io::Stderr,
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23 colors: Option<ColorConfig>,
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24 encoder: Encoder,
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25 }
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26
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27 /// The kind of user interface error
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28 pub enum UiError {
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29 /// The standard output stream cannot be written to
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30 StdoutError(io::Error),
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31 /// The standard error stream cannot be written to
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32 StderrError(io::Error),
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33 }
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34
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35 /// The commandline user interface
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36 impl Ui {
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37 pub fn new(config: &Config) -> Result<Self, HgError> {
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38 Ok(Ui {
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39 // If using something else, also adapt `isatty()` below.
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40 stdout: std::io::stdout(),
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41
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42 stderr: std::io::stderr(),
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43 colors: ColorConfig::new(config)?,
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44 encoder: Encoder::from_env()?,
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45 })
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46 }
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47
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48 /// Default to no color if color configuration errors.
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49 ///
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50 /// Useful when we’re already handling another error.
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51 pub fn new_infallible(config: &Config) -> Self {
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52 Ui {
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53 // If using something else, also adapt `isatty()` below.
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54 stdout: std::io::stdout(),
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55
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56 stderr: std::io::stderr(),
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57 colors: ColorConfig::new(config).unwrap_or(None),
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58 encoder: Encoder::default(),
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59 }
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60 }
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61
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62 /// Returns a buffered handle on stdout for faster batch printing
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63 /// operations.
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64 pub fn stdout_buffer(&self) -> StdoutBuffer<'_, BufWriter<StdoutLock>> {
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65 StdoutBuffer {
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66 stdout: BufWriter::new(self.stdout.lock()),
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67 colors: &self.colors,
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68 }
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69 }
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70
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71 /// Write bytes to stdout
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72 pub fn write_stdout(&self, bytes: &[u8]) -> Result<(), UiError> {
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73 let mut stdout = self.stdout.lock();
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74
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75 stdout.write_all(bytes).or_else(handle_stdout_error)?;
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76
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77 stdout.flush().or_else(handle_stdout_error)
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78 }
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79
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80 /// Write bytes to stderr
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81 pub fn write_stderr(&self, bytes: &[u8]) -> Result<(), UiError> {
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82 let mut stderr = self.stderr.lock();
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83
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84 stderr.write_all(bytes).or_else(handle_stderr_error)?;
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85
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86 stderr.flush().or_else(handle_stderr_error)
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87 }
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88
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89 // TODO: use this
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90 #[allow(dead_code)]
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91 pub fn encoder(&self) -> &Encoder {
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92 &self.encoder
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93 }
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94 }
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95
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96 /// A buffered stdout writer for faster batch printing operations.
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97 pub struct StdoutBuffer<'a, W> {
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98 colors: &'a Option<ColorConfig>,
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99 stdout: W,
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100 }
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101
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102 impl<'a, W: Write> StdoutBuffer<'a, W> {
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103 /// Write bytes to stdout with the given label
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104 ///
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105 /// Like the optional `label` parameter in `mercurial/ui.py`,
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106 /// this label influences the color used for this output.
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107 pub fn write_stdout_labelled(
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108 &mut self,
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109 bytes: &[u8],
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110 label: &str,
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111 ) -> Result<(), UiError> {
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112 if let Some(colors) = &self.colors {
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113 if let Some(effects) = colors.styles.get(label.as_bytes()) {
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114 if !effects.is_empty() {
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115 return self
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116 .write_stdout_with_effects(bytes, effects)
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117 .or_else(handle_stdout_error);
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118 }
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119 }
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120 }
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121 self.write_all(bytes)
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122 }
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123
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124 fn write_stdout_with_effects(
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125 &mut self,
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126 bytes: &[u8],
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127 effects: &[Effect],
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128 ) -> io::Result<()> {
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129 let stdout = &mut self.stdout;
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130 let mut write_line = |line: &[u8], first: bool| {
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131 // `line` does not include the newline delimiter
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132 if !first {
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133 stdout.write_all(b"\n")?;
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134 }
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135 if line.is_empty() {
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136 return Ok(());
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137 }
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138 /// 0x1B == 27 == 0o33
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139 const ASCII_ESCAPE: &[u8] = b"\x1b";
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140 write_bytes!(stdout, b"{}[0", ASCII_ESCAPE)?;
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141 for effect in effects {
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142 write_bytes!(stdout, b";{}", effect)?;
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143 }
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144 write_bytes!(stdout, b"m")?;
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145 stdout.write_all(line)?;
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146 write_bytes!(stdout, b"{}[0m", ASCII_ESCAPE)
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147 };
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148 let mut lines = bytes.split(|&byte| byte == b'\n');
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149 if let Some(first) = lines.next() {
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150 write_line(first, true)?;
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151 for line in lines {
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152 write_line(line, false)?
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153 }
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154 }
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155 Ok(())
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156 }
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157
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158 /// Write bytes to stdout buffer
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159 pub fn write_all(&mut self, bytes: &[u8]) -> Result<(), UiError> {
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160 self.stdout.write_all(bytes).or_else(handle_stdout_error)
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161 }
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162
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163 /// Flush bytes to stdout
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164 pub fn flush(&mut self) -> Result<(), UiError> {
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165 self.stdout.flush().or_else(handle_stdout_error)
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166 }
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167 }
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168
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169 // TODO: pass the PlainInfo to call sites directly and
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170 // delete this function
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171 pub fn plain(opt_feature: Option<&str>) -> bool {
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172 let plain_info = PlainInfo::from_env();
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173 match opt_feature {
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174 None => plain_info.is_plain(),
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175 Some(feature) => plain_info.is_feature_plain(feature),
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176 }
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parents:
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177 }
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178
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179 /// Sometimes writing to stdout is not possible, try writing to stderr to
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180 /// signal that failure, otherwise just bail.
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181 fn handle_stdout_error(error: io::Error) -> Result<(), UiError> {
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182 if let ErrorKind::BrokenPipe = error.kind() {
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183 // This makes `| head` work for example
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184 return Ok(());
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185 }
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186 let mut stderr = io::stderr();
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187
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188 stderr
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189 .write_all(&format_bytes!(
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190 b"abort: {}\n",
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191 error.to_string().as_bytes()
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192 ))
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193 .map_err(UiError::StderrError)?;
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194
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195 stderr.flush().map_err(UiError::StderrError)?;
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196
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197 Err(UiError::StdoutError(error))
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198 }
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199
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200 /// Sometimes writing to stderr is not possible.
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201 fn handle_stderr_error(error: io::Error) -> Result<(), UiError> {
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202 // A broken pipe should not result in a error
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203 // like with `| head` for example
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diff changeset
204 if let ErrorKind::BrokenPipe = error.kind() {
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205 return Ok(());
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206 }
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diff changeset
207 Err(UiError::StdoutError(error))
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208 }
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66756b34c06e rhg: add a `DebugData` `Command` to prepare the `rhg debugdata` subcommand
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209
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210 /// Should formatted output be used?
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211 ///
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212 /// Note: rhg does not have the formatter mechanism yet,
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213 /// but this is also used when deciding whether to use color.
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214 pub fn formatted(config: &Config) -> Result<bool, HgError> {
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diff changeset
215 if let Some(formatted) = config.get_option(b"ui", b"formatted")? {
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diff changeset
216 Ok(formatted)
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diff changeset
217 } else {
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diff changeset
218 isatty(config)
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diff changeset
219 }
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diff changeset
220 }
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diff changeset
221
50536
74e4dbb0fcd5 rhg: make `rhg files` work if `ui.relative-files=true` is specified
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diff changeset
222 pub enum RelativePaths {
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diff changeset
223 Legacy,
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diff changeset
224 Bool(bool),
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diff changeset
225 }
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diff changeset
226
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diff changeset
227 pub fn relative_paths(config: &Config) -> Result<RelativePaths, HgError> {
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diff changeset
228 Ok(match config.get(b"ui", b"relative-paths") {
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diff changeset
229 None | Some(b"legacy") => RelativePaths::Legacy,
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diff changeset
230 _ => RelativePaths::Bool(config.get_bool(b"ui", b"relative-paths")?),
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diff changeset
231 })
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diff changeset
232 }
74e4dbb0fcd5 rhg: make `rhg files` work if `ui.relative-files=true` is specified
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diff changeset
233
48733
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diff changeset
234 fn isatty(config: &Config) -> Result<bool, HgError> {
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diff changeset
235 Ok(if config.get_bool(b"ui", b"nontty")? {
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diff changeset
236 false
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diff changeset
237 } else {
52309
56e8841a454c rust: remove `atty` dependency
Rapha?l Gom?s <rgomes@octobus.net>
parents: 52303
diff changeset
238 std::io::stdout().is_terminal()
48733
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diff changeset
239 })
39c447e03dbc rhg: Add support for colored output
Simon Sapin <simon.sapin@octobus.net>
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diff changeset
240 }
49981
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
241
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
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diff changeset
242 /// Return the formatted bytestring corresponding to a pattern file warning,
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
243 /// as expected by the CLI.
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
244 pub(crate) fn format_pattern_file_warning(
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Rapha?l Gom?s <rgomes@octobus.net>
parents: 49513
diff changeset
245 warning: &PatternFileWarning,
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
246 repo: &Repo,
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
247 ) -> Vec<u8> {
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
248 match warning {
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
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diff changeset
249 PatternFileWarning::InvalidSyntax(path, syntax) => format_bytes!(
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49513
diff changeset
250 b"{}: ignoring invalid syntax '{}'\n",
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49513
diff changeset
251 get_bytes_from_path(path),
51117
532e74ad3ff6 rust: run a clippy pass with the latest stable version
Rapha?l Gom?s <rgomes@octobus.net>
parents: 50536
diff changeset
252 syntax
49981
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49513
diff changeset
253 ),
364e78389653 rust-ui: refactor ui code for printing narrow/sparse warnings
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49513
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254 PatternFileWarning::NoSuchFile(path) => {
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255 let path = if let Ok(relative) =
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256 path.strip_prefix(repo.working_directory_path())
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257 {
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258 relative
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259 } else {
51117
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260 path
49981
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261 };
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262 format_bytes!(
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263 b"skipping unreadable pattern file '{}': \
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264 No such file or directory\n",
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265 get_bytes_from_path(path),
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266 )
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267 }
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268 }
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269 }
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270
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271 /// Print with `Ui` the formatted bytestring corresponding to a
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272 /// sparse/narrow warning, as expected by the CLI.
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273 pub(crate) fn print_narrow_sparse_warnings(
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274 narrow_warnings: &[sparse::SparseWarning],
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275 sparse_warnings: &[sparse::SparseWarning],
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276 ui: &Ui,
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277 repo: &Repo,
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278 ) -> Result<(), CommandError> {
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279 for warning in narrow_warnings.iter().chain(sparse_warnings) {
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280 match &warning {
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281 sparse::SparseWarning::RootWarning { context, line } => {
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282 let msg = format_bytes!(
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283 b"warning: {} profile cannot use paths \"
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284 starting with /, ignoring {}\n",
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285 context,
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286 line
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287 );
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288 ui.write_stderr(&msg)?;
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289 }
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290 sparse::SparseWarning::ProfileNotFound { profile, rev } => {
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291 let msg = format_bytes!(
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292 b"warning: sparse profile '{}' not found \"
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293 in rev {} - ignoring it\n",
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294 profile,
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295 rev
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296 );
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297 ui.write_stderr(&msg)?;
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298 }
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299 sparse::SparseWarning::Pattern(e) => {
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300 ui.write_stderr(&format_pattern_file_warning(e, repo))?;
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301 }
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302 }
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303 }
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304 Ok(())
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305 }