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annotate rust/rhg/src/ui.rs @ 45530:b1cea0dc9db0

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rhg: Add debug timing Differential Revision: https://phab.mercurial-scm.org/D8962
author Antoine Cezar <antoine.cezar@octobus.net>
date Wed, 23 Sep 2020 12:26:16 +0200
parents 66756b34c06e
children fada33872b5b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
45528
66756b34c06e rhg: add a `DebugData` `Command` to prepare the `rhg debugdata` subcommand
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1 use std::borrow::Cow;
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2 use std::io;
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3 use std::io::{ErrorKind, Write};
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4
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5 #[derive(Debug)]
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6 pub struct Ui {
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7 stdout: std::io::Stdout,
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8 stderr: std::io::Stderr,
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9 }
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10
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11 /// The kind of user interface error
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12 pub enum UiError {
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13 /// The standard output stream cannot be written to
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14 StdoutError(io::Error),
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15 /// The standard error stream cannot be written to
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16 StderrError(io::Error),
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17 }
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18
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19 /// The commandline user interface
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20 impl Ui {
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21 pub fn new() -> Self {
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22 Ui {
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23 stdout: std::io::stdout(),
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24 stderr: std::io::stderr(),
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25 }
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26 }
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27
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28 /// Returns a buffered handle on stdout for faster batch printing
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29 /// operations.
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30 pub fn stdout_buffer(&self) -> StdoutBuffer<std::io::StdoutLock> {
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31 StdoutBuffer::new(self.stdout.lock())
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32 }
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33
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34 /// Write bytes to stdout
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35 pub fn write_stdout(&self, bytes: &[u8]) -> Result<(), UiError> {
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36 let mut stdout = self.stdout.lock();
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37
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38 stdout.write_all(bytes).or_else(handle_stdout_error)?;
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39
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40 stdout.flush().or_else(handle_stdout_error)
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41 }
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42
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43 /// Write bytes to stderr
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44 pub fn write_stderr(&self, bytes: &[u8]) -> Result<(), UiError> {
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45 let mut stderr = self.stderr.lock();
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46
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47 stderr.write_all(bytes).or_else(handle_stderr_error)?;
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48
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49 stderr.flush().or_else(handle_stderr_error)
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50 }
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51
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52 /// Write string line to stderr
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53 pub fn writeln_stderr_str(&self, s: &str) -> Result<(), UiError> {
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54 self.write_stderr(&format!("{}\n", s).as_bytes())
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55 }
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56 }
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57
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58 /// A buffered stdout writer for faster batch printing operations.
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59 pub struct StdoutBuffer<W: Write> {
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60 buf: io::BufWriter<W>,
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61 }
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62
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63 impl<W: Write> StdoutBuffer<W> {
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64 pub fn new(writer: W) -> Self {
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65 let buf = io::BufWriter::new(writer);
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66 Self { buf }
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67 }
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68
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69 /// Write bytes to stdout buffer
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70 pub fn write_all(&mut self, bytes: &[u8]) -> Result<(), UiError> {
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71 self.buf.write_all(bytes).or_else(handle_stdout_error)
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72 }
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73
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74 /// Flush bytes to stdout
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75 pub fn flush(&mut self) -> Result<(), UiError> {
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76 self.buf.flush().or_else(handle_stdout_error)
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77 }
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78 }
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79
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80 /// Sometimes writing to stdout is not possible, try writing to stderr to
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81 /// signal that failure, otherwise just bail.
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82 fn handle_stdout_error(error: io::Error) -> Result<(), UiError> {
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83 if let ErrorKind::BrokenPipe = error.kind() {
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84 // This makes `| head` work for example
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85 return Ok(());
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86 }
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87 let mut stderr = io::stderr();
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88
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89 stderr
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90 .write_all(&[b"abort: ", error.to_string().as_bytes(), b"\n"].concat())
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91 .map_err(UiError::StderrError)?;
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92
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93 stderr.flush().map_err(UiError::StderrError)?;
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94
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95 Err(UiError::StdoutError(error))
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96 }
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97
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98 /// Sometimes writing to stderr is not possible.
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99 fn handle_stderr_error(error: io::Error) -> Result<(), UiError> {
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100 // A broken pipe should not result in a error
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101 // like with `| head` for example
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102 if let ErrorKind::BrokenPipe = error.kind() {
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103 return Ok(());
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104 }
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105 Err(UiError::StdoutError(error))
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106 }
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107
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108 /// Encode rust strings according to the user system.
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109 pub fn utf8_to_local(s: &str) -> Cow<[u8]> {
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110 // TODO encode for the user's system //
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111 let bytes = s.as_bytes();
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112 Cow::Borrowed(bytes)
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113 }