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annotate rust/rhg/src/ui.rs @ 48550:47f2a82ae3e4

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rhg: Fall back to Python if verbose status is requested by config Differential Revision: https://phab.mercurial-scm.org/D11943
author Simon Sapin <simon.sapin@octobus.net>
date Sat, 18 Dec 2021 11:47:03 +0100
parents 38deb65d4441
children 99b1dfc06571
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 /// Return whether plain mode is 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 }
45534
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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 }