Mercurial > public > mercurial-scm > hg

annotate rust/rhg/src/ui.rs @ 48674:f7086f6173f8 stable

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dirstate-v2: rename the configuration to enable the format The rename of the old experimental name was overlooked before the 6.0 release. We rename everything to use the new name (and keep the released name as an alias for compatibility). Differential Revision: https://phab.mercurial-scm.org/D12129
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 01 Feb 2022 16:36:20 +0100
parents 38deb65d4441
children 47f2a82ae3e4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use format_bytes::format_bytes;
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2 use std::borrow::Cow;
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3 use std::env;
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4 use std::io;
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5 use std::io::{ErrorKind, Write};
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6
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7 #[derive(Debug)]
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8 pub struct Ui {
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9 stdout: std::io::Stdout,
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10 stderr: std::io::Stderr,
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11 }
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12
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13 /// The kind of user interface error
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14 pub enum UiError {
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15 /// The standard output stream cannot be written to
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16 StdoutError(io::Error),
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17 /// The standard error stream cannot be written to
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18 StderrError(io::Error),
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19 }
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20
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21 /// The commandline user interface
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22 impl Ui {
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23 pub fn new() -> Self {
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24 Ui {
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25 stdout: std::io::stdout(),
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26 stderr: std::io::stderr(),
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27 }
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28 }
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29
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30 /// Returns a buffered handle on stdout for faster batch printing
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31 /// operations.
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32 pub fn stdout_buffer(&self) -> StdoutBuffer<std::io::StdoutLock> {
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33 StdoutBuffer::new(self.stdout.lock())
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34 }
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35
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36 /// Write bytes to stdout
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37 pub fn write_stdout(&self, bytes: &[u8]) -> Result<(), UiError> {
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38 let mut stdout = self.stdout.lock();
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39
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40 stdout.write_all(bytes).or_else(handle_stdout_error)?;
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41
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42 stdout.flush().or_else(handle_stdout_error)
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43 }
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44
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45 /// Write bytes to stderr
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46 pub fn write_stderr(&self, bytes: &[u8]) -> Result<(), UiError> {
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47 let mut stderr = self.stderr.lock();
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48
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49 stderr.write_all(bytes).or_else(handle_stderr_error)?;
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50
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51 stderr.flush().or_else(handle_stderr_error)
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52 }
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53
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54 /// is plain mode active
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55 ///
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56 /// Plain mode means that all configuration variables which affect
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57 /// the behavior and output of Mercurial should be
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58 /// ignored. Additionally, the output should be stable,
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59 /// reproducible and suitable for use in scripts or applications.
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60 ///
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61 /// The only way to trigger plain mode is by setting either the
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62 /// `HGPLAIN' or `HGPLAINEXCEPT' environment variables.
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63 ///
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64 /// The return value can either be
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65 /// - False if HGPLAIN is not set, or feature is in HGPLAINEXCEPT
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66 /// - False if feature is disabled by default and not included in HGPLAIN
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67 /// - True otherwise
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68 pub fn plain(&self) -> bool {
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69 // TODO: add support for HGPLAINEXCEPT
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70 env::var_os("HGPLAIN").is_some()
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71 }
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72 }
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73
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74 /// A buffered stdout writer for faster batch printing operations.
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75 pub struct StdoutBuffer<W: Write> {
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76 buf: io::BufWriter<W>,
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77 }
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78
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79 impl<W: Write> StdoutBuffer<W> {
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80 pub fn new(writer: W) -> Self {
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81 let buf = io::BufWriter::new(writer);
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82 Self { buf }
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83 }
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84
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85 /// Write bytes to stdout buffer
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86 pub fn write_all(&mut self, bytes: &[u8]) -> Result<(), UiError> {
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87 self.buf.write_all(bytes).or_else(handle_stdout_error)
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88 }
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89
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90 /// Flush bytes to stdout
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91 pub fn flush(&mut self) -> Result<(), UiError> {
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92 self.buf.flush().or_else(handle_stdout_error)
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93 }
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94 }
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95
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96 /// Sometimes writing to stdout is not possible, try writing to stderr to
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97 /// signal that failure, otherwise just bail.
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98 fn handle_stdout_error(error: io::Error) -> Result<(), UiError> {
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99 if let ErrorKind::BrokenPipe = error.kind() {
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100 // This makes `| head` work for example
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101 return Ok(());
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102 }
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103 let mut stderr = io::stderr();
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104
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105 stderr
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106 .write_all(&format_bytes!(
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107 b"abort: {}\n",
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108 error.to_string().as_bytes()
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109 ))
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110 .map_err(UiError::StderrError)?;
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111
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112 stderr.flush().map_err(UiError::StderrError)?;
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113
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114 Err(UiError::StdoutError(error))
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115 }
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116
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117 /// Sometimes writing to stderr is not possible.
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118 fn handle_stderr_error(error: io::Error) -> Result<(), UiError> {
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119 // A broken pipe should not result in a error
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120 // like with `| head` for example
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121 if let ErrorKind::BrokenPipe = error.kind() {
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122 return Ok(());
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123 }
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124 Err(UiError::StdoutError(error))
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125 }
45528
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126
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127 /// Encode rust strings according to the user system.
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128 pub fn utf8_to_local(s: &str) -> Cow<[u8]> {
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129 // TODO encode for the user's system //
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130 let bytes = s.as_bytes();
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131 Cow::Borrowed(bytes)
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132 }