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annotate rust/rhg/src/ui.rs @ 45440:a6a000ab135b

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rhg: print error message when argument parsing fails Differential Revision: https://phab.mercurial-scm.org/D8956
author Antoine Cezar <antoine.cezar@octobus.net>
date Mon, 17 Aug 2020 16:55:43 +0200
parents fbc373b7cbc3
children 66756b34c06e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use std::io;
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2 use std::io::{ErrorKind, Write};
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3
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4 #[derive(Debug)]
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5 pub struct Ui {
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6 stdout: std::io::Stdout,
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7 stderr: std::io::Stderr,
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8 }
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9
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10 /// The kind of user interface error
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11 pub enum UiError {
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12 /// The standard output stream cannot be written to
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13 StdoutError(io::Error),
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14 /// The standard error stream cannot be written to
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15 StderrError(io::Error),
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16 }
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17
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18 /// The commandline user interface
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19 impl Ui {
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20 pub fn new() -> Self {
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21 Ui {
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22 stdout: std::io::stdout(),
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23 stderr: std::io::stderr(),
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24 }
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25 }
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26
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27 /// Returns a buffered handle on stdout for faster batch printing
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28 /// operations.
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29 pub fn stdout_buffer(&self) -> StdoutBuffer<std::io::StdoutLock> {
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30 StdoutBuffer::new(self.stdout.lock())
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31 }
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32
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33 /// Write bytes to stdout
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34 pub fn write_stdout(&self, bytes: &[u8]) -> Result<(), UiError> {
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35 let mut stdout = self.stdout.lock();
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36
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37 stdout.write_all(bytes).or_else(handle_stdout_error)?;
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38
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39 stdout.flush().or_else(handle_stdout_error)
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40 }
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41
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42 /// Write bytes to stderr
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43 pub fn write_stderr(&self, bytes: &[u8]) -> Result<(), UiError> {
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44 let mut stderr = self.stderr.lock();
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45
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46 stderr.write_all(bytes).or_else(handle_stderr_error)?;
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47
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48 stderr.flush().or_else(handle_stderr_error)
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49 }
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50
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51 /// Write string line to stderr
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52 pub fn writeln_stderr_str(&self, s: &str) -> Result<(), UiError> {
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53 self.write_stderr(&format!("{}\n", s).as_bytes())
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54 }
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55 }
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56
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57 /// A buffered stdout writer for faster batch printing operations.
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58 pub struct StdoutBuffer<W: Write> {
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59 buf: io::BufWriter<W>,
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60 }
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61
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62 impl<W: Write> StdoutBuffer<W> {
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63 pub fn new(writer: W) -> Self {
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64 let buf = io::BufWriter::new(writer);
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65 Self { buf }
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66 }
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67
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68 /// Write bytes to stdout buffer
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69 pub fn write_all(&mut self, bytes: &[u8]) -> Result<(), UiError> {
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70 self.buf.write_all(bytes).or_else(handle_stdout_error)
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71 }
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72
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73 /// Flush bytes to stdout
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74 pub fn flush(&mut self) -> Result<(), UiError> {
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75 self.buf.flush().or_else(handle_stdout_error)
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76 }
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77 }
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78
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79 /// Sometimes writing to stdout is not possible, try writing to stderr to
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80 /// signal that failure, otherwise just bail.
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81 fn handle_stdout_error(error: io::Error) -> Result<(), UiError> {
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82 if let ErrorKind::BrokenPipe = error.kind() {
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83 // This makes `| head` work for example
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84 return Ok(());
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85 }
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86 let mut stderr = io::stderr();
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87
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88 stderr
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89 .write_all(&[b"abort: ", error.to_string().as_bytes(), b"\n"].concat())
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90 .map_err(UiError::StderrError)?;
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91
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92 stderr.flush().map_err(UiError::StderrError)?;
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93
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94 Err(UiError::StdoutError(error))
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95 }
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96
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97 /// Sometimes writing to stderr is not possible.
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98 fn handle_stderr_error(error: io::Error) -> Result<(), UiError> {
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99 // A broken pipe should not result in a error
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100 // like with `| head` for example
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101 if let ErrorKind::BrokenPipe = error.kind() {
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102 return Ok(());
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103 }
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104 Err(UiError::StdoutError(error))
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105 }