| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `crates/rust-analyzer/src/command.rs`."><title>command.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-77263533.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="rust_analyzer" data-themes="" data-resource-suffix="" data-rustdoc-version="1.94.0 (4a4ef493e 2026-03-02)" data-channel="1.94.0" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-b897f86f.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-7bab91a1.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-ffcac47a.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">rust_analyzer/</div>command.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Utilities for running a cargo command like `cargo check` or `cargo test` in a separate thread |
| <a href=#2 id=2 data-nosnippet>2</a>//! and parse its stdout/stderr. |
| <a href=#3 id=3 data-nosnippet>3</a> |
| <a href=#4 id=4 data-nosnippet>4</a></span><span class="kw">use </span>std::{ |
| <a href=#5 id=5 data-nosnippet>5</a> ffi::OsString, |
| <a href=#6 id=6 data-nosnippet>6</a> fmt, |
| <a href=#7 id=7 data-nosnippet>7</a> io::{<span class="self">self</span>, BufWriter, Write}, |
| <a href=#8 id=8 data-nosnippet>8</a> marker::PhantomData, |
| <a href=#9 id=9 data-nosnippet>9</a> path::PathBuf, |
| <a href=#10 id=10 data-nosnippet>10</a> process::{ChildStderr, ChildStdout, Command, Stdio}, |
| <a href=#11 id=11 data-nosnippet>11</a>}; |
| <a href=#12 id=12 data-nosnippet>12</a> |
| <a href=#13 id=13 data-nosnippet>13</a><span class="kw">use </span>anyhow::Context; |
| <a href=#14 id=14 data-nosnippet>14</a><span class="kw">use </span>crossbeam_channel::Sender; |
| <a href=#15 id=15 data-nosnippet>15</a><span class="kw">use </span>paths::Utf8PathBuf; |
| <a href=#16 id=16 data-nosnippet>16</a><span class="kw">use </span>process_wrap::std::{StdChildWrapper, StdCommandWrap}; |
| <a href=#17 id=17 data-nosnippet>17</a><span class="kw">use </span>stdx::process::streaming_output; |
| <a href=#18 id=18 data-nosnippet>18</a> |
| <a href=#19 id=19 data-nosnippet>19</a><span class="doccomment">/// This trait abstracts parsing one line of JSON output into a Rust |
| <a href=#20 id=20 data-nosnippet>20</a>/// data type. |
| <a href=#21 id=21 data-nosnippet>21</a>/// |
| <a href=#22 id=22 data-nosnippet>22</a>/// This is useful for `cargo check` output, `cargo test` output, as |
| <a href=#23 id=23 data-nosnippet>23</a>/// well as custom discover commands. |
| <a href=#24 id=24 data-nosnippet>24</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>JsonLinesParser<T>: Send + <span class="lifetime">'static </span>{ |
| <a href=#25 id=25 data-nosnippet>25</a> <span class="kw">fn </span>from_line(<span class="kw-2">&</span><span class="self">self</span>, line: <span class="kw-2">&</span>str, error: <span class="kw-2">&mut </span>String) -> <span class="prelude-ty">Option</span><T>; |
| <a href=#26 id=26 data-nosnippet>26</a> <span class="kw">fn </span>from_eof(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><T>; |
| <a href=#27 id=27 data-nosnippet>27</a>} |
| <a href=#28 id=28 data-nosnippet>28</a> |
| <a href=#29 id=29 data-nosnippet>29</a><span class="kw">struct </span>CommandActor<T> { |
| <a href=#30 id=30 data-nosnippet>30</a> parser: Box<<span class="kw">dyn </span>JsonLinesParser<T>>, |
| <a href=#31 id=31 data-nosnippet>31</a> sender: Sender<T>, |
| <a href=#32 id=32 data-nosnippet>32</a> stdout: ChildStdout, |
| <a href=#33 id=33 data-nosnippet>33</a> stderr: ChildStderr, |
| <a href=#34 id=34 data-nosnippet>34</a>} |
| <a href=#35 id=35 data-nosnippet>35</a> |
| <a href=#36 id=36 data-nosnippet>36</a><span class="kw">impl</span><T: Sized + Send + <span class="lifetime">'static</span>> CommandActor<T> { |
| <a href=#37 id=37 data-nosnippet>37</a> <span class="kw">fn </span>new( |
| <a href=#38 id=38 data-nosnippet>38</a> parser: <span class="kw">impl </span>JsonLinesParser<T>, |
| <a href=#39 id=39 data-nosnippet>39</a> sender: Sender<T>, |
| <a href=#40 id=40 data-nosnippet>40</a> stdout: ChildStdout, |
| <a href=#41 id=41 data-nosnippet>41</a> stderr: ChildStderr, |
| <a href=#42 id=42 data-nosnippet>42</a> ) -> <span class="self">Self </span>{ |
| <a href=#43 id=43 data-nosnippet>43</a> <span class="kw">let </span>parser = Box::new(parser); |
| <a href=#44 id=44 data-nosnippet>44</a> CommandActor { parser, sender, stdout, stderr } |
| <a href=#45 id=45 data-nosnippet>45</a> } |
| <a href=#46 id=46 data-nosnippet>46</a>} |
| <a href=#47 id=47 data-nosnippet>47</a> |
| <a href=#48 id=48 data-nosnippet>48</a><span class="kw">impl</span><T: Sized + Send + <span class="lifetime">'static</span>> CommandActor<T> { |
| <a href=#49 id=49 data-nosnippet>49</a> <span class="kw">fn </span>run(<span class="self">self</span>, outfile: <span class="prelude-ty">Option</span><Utf8PathBuf>) -> io::Result<(bool, String)> { |
| <a href=#50 id=50 data-nosnippet>50</a> <span class="comment">// We manually read a line at a time, instead of using serde's |
| <a href=#51 id=51 data-nosnippet>51</a> // stream deserializers, because the deserializer cannot recover |
| <a href=#52 id=52 data-nosnippet>52</a> // from an error, resulting in it getting stuck, because we try to |
| <a href=#53 id=53 data-nosnippet>53</a> // be resilient against failures. |
| <a href=#54 id=54 data-nosnippet>54</a> // |
| <a href=#55 id=55 data-nosnippet>55</a> // Because cargo only outputs one JSON object per line, we can |
| <a href=#56 id=56 data-nosnippet>56</a> // simply skip a line if it doesn't parse, which just ignores any |
| <a href=#57 id=57 data-nosnippet>57</a> // erroneous output. |
| <a href=#58 id=58 data-nosnippet>58</a> |
| <a href=#59 id=59 data-nosnippet>59</a> </span><span class="kw">let </span><span class="kw-2">mut </span>stdout = outfile.as_ref().and_then(|path| { |
| <a href=#60 id=60 data-nosnippet>60</a> <span class="kw">_ </span>= std::fs::create_dir_all(path); |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="prelude-val">Some</span>(BufWriter::new(std::fs::File::create(path.join(<span class="string">"stdout"</span>)).ok()<span class="question-mark">?</span>)) |
| <a href=#62 id=62 data-nosnippet>62</a> }); |
| <a href=#63 id=63 data-nosnippet>63</a> <span class="kw">let </span><span class="kw-2">mut </span>stderr = outfile.as_ref().and_then(|path| { |
| <a href=#64 id=64 data-nosnippet>64</a> <span class="kw">_ </span>= std::fs::create_dir_all(path); |
| <a href=#65 id=65 data-nosnippet>65</a> <span class="prelude-val">Some</span>(BufWriter::new(std::fs::File::create(path.join(<span class="string">"stderr"</span>)).ok()<span class="question-mark">?</span>)) |
| <a href=#66 id=66 data-nosnippet>66</a> }); |
| <a href=#67 id=67 data-nosnippet>67</a> |
| <a href=#68 id=68 data-nosnippet>68</a> <span class="kw">let </span><span class="kw-2">mut </span>stdout_errors = String::new(); |
| <a href=#69 id=69 data-nosnippet>69</a> <span class="kw">let </span><span class="kw-2">mut </span>stderr_errors = String::new(); |
| <a href=#70 id=70 data-nosnippet>70</a> <span class="kw">let </span><span class="kw-2">mut </span>read_at_least_one_stdout_message = <span class="bool-val">false</span>; |
| <a href=#71 id=71 data-nosnippet>71</a> <span class="kw">let </span><span class="kw-2">mut </span>read_at_least_one_stderr_message = <span class="bool-val">false</span>; |
| <a href=#72 id=72 data-nosnippet>72</a> <span class="kw">let </span>process_line = |line: <span class="kw-2">&</span>str, error: <span class="kw-2">&mut </span>String| { |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="comment">// Try to deserialize a message from Cargo or Rustc. |
| <a href=#74 id=74 data-nosnippet>74</a> </span><span class="kw">if let </span><span class="prelude-val">Some</span>(t) = <span class="self">self</span>.parser.from_line(line, error) { |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="self">self</span>.sender.send(t).unwrap(); |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="bool-val">true |
| <a href=#77 id=77 data-nosnippet>77</a> </span>} <span class="kw">else </span>{ |
| <a href=#78 id=78 data-nosnippet>78</a> <span class="bool-val">false |
| <a href=#79 id=79 data-nosnippet>79</a> </span>} |
| <a href=#80 id=80 data-nosnippet>80</a> }; |
| <a href=#81 id=81 data-nosnippet>81</a> <span class="kw">let </span>output = streaming_output( |
| <a href=#82 id=82 data-nosnippet>82</a> <span class="self">self</span>.stdout, |
| <a href=#83 id=83 data-nosnippet>83</a> <span class="self">self</span>.stderr, |
| <a href=#84 id=84 data-nosnippet>84</a> <span class="kw-2">&mut </span>|line| { |
| <a href=#85 id=85 data-nosnippet>85</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(stdout) = <span class="kw-2">&mut </span>stdout { |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="kw">_ </span>= stdout.write_all(line.as_bytes()); |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="kw">_ </span>= stdout.write_all(<span class="string">b"\n"</span>); |
| <a href=#88 id=88 data-nosnippet>88</a> } |
| <a href=#89 id=89 data-nosnippet>89</a> <span class="kw">if </span>process_line(line, <span class="kw-2">&mut </span>stdout_errors) { |
| <a href=#90 id=90 data-nosnippet>90</a> read_at_least_one_stdout_message = <span class="bool-val">true</span>; |
| <a href=#91 id=91 data-nosnippet>91</a> } |
| <a href=#92 id=92 data-nosnippet>92</a> }, |
| <a href=#93 id=93 data-nosnippet>93</a> <span class="kw-2">&mut </span>|line| { |
| <a href=#94 id=94 data-nosnippet>94</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(stderr) = <span class="kw-2">&mut </span>stderr { |
| <a href=#95 id=95 data-nosnippet>95</a> <span class="kw">_ </span>= stderr.write_all(line.as_bytes()); |
| <a href=#96 id=96 data-nosnippet>96</a> <span class="kw">_ </span>= stderr.write_all(<span class="string">b"\n"</span>); |
| <a href=#97 id=97 data-nosnippet>97</a> } |
| <a href=#98 id=98 data-nosnippet>98</a> <span class="kw">if </span>process_line(line, <span class="kw-2">&mut </span>stderr_errors) { |
| <a href=#99 id=99 data-nosnippet>99</a> read_at_least_one_stderr_message = <span class="bool-val">true</span>; |
| <a href=#100 id=100 data-nosnippet>100</a> } |
| <a href=#101 id=101 data-nosnippet>101</a> }, |
| <a href=#102 id=102 data-nosnippet>102</a> <span class="kw-2">&mut </span>|| { |
| <a href=#103 id=103 data-nosnippet>103</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(t) = <span class="self">self</span>.parser.from_eof() { |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="self">self</span>.sender.send(t).unwrap(); |
| <a href=#105 id=105 data-nosnippet>105</a> } |
| <a href=#106 id=106 data-nosnippet>106</a> }, |
| <a href=#107 id=107 data-nosnippet>107</a> ); |
| <a href=#108 id=108 data-nosnippet>108</a> |
| <a href=#109 id=109 data-nosnippet>109</a> <span class="kw">let </span>read_at_least_one_message = |
| <a href=#110 id=110 data-nosnippet>110</a> read_at_least_one_stdout_message || read_at_least_one_stderr_message; |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="kw">let </span><span class="kw-2">mut </span>error = stdout_errors; |
| <a href=#112 id=112 data-nosnippet>112</a> error.push_str(<span class="kw-2">&</span>stderr_errors); |
| <a href=#113 id=113 data-nosnippet>113</a> <span class="kw">match </span>output { |
| <a href=#114 id=114 data-nosnippet>114</a> <span class="prelude-val">Ok</span>(<span class="kw">_</span>) => <span class="prelude-val">Ok</span>((read_at_least_one_message, error)), |
| <a href=#115 id=115 data-nosnippet>115</a> <span class="prelude-val">Err</span>(e) => <span class="prelude-val">Err</span>(io::Error::new(e.kind(), <span class="macro">format!</span>(<span class="string">"{e:?}: {error}"</span>))), |
| <a href=#116 id=116 data-nosnippet>116</a> } |
| <a href=#117 id=117 data-nosnippet>117</a> } |
| <a href=#118 id=118 data-nosnippet>118</a>} |
| <a href=#119 id=119 data-nosnippet>119</a> |
| <a href=#120 id=120 data-nosnippet>120</a><span class="doccomment">/// 'Join On Drop' wrapper for a child process. |
| <a href=#121 id=121 data-nosnippet>121</a>/// |
| <a href=#122 id=122 data-nosnippet>122</a>/// This wrapper kills the process when the wrapper is dropped. |
| <a href=#123 id=123 data-nosnippet>123</a></span><span class="kw">struct </span>JodGroupChild(Box<<span class="kw">dyn </span>StdChildWrapper>); |
| <a href=#124 id=124 data-nosnippet>124</a> |
| <a href=#125 id=125 data-nosnippet>125</a><span class="kw">impl </span>Drop <span class="kw">for </span>JodGroupChild { |
| <a href=#126 id=126 data-nosnippet>126</a> <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#127 id=127 data-nosnippet>127</a> <span class="kw">_ </span>= <span class="self">self</span>.<span class="number">0</span>.kill(); |
| <a href=#128 id=128 data-nosnippet>128</a> <span class="kw">_ </span>= <span class="self">self</span>.<span class="number">0</span>.wait(); |
| <a href=#129 id=129 data-nosnippet>129</a> } |
| <a href=#130 id=130 data-nosnippet>130</a>} |
| <a href=#131 id=131 data-nosnippet>131</a> |
| <a href=#132 id=132 data-nosnippet>132</a><span class="doccomment">/// A handle to a shell command, such as cargo for diagnostics (flycheck). |
| <a href=#133 id=133 data-nosnippet>133</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>CommandHandle<T> { |
| <a href=#134 id=134 data-nosnippet>134</a> <span class="doccomment">/// The handle to the actual child process. As we cannot cancel directly from with |
| <a href=#135 id=135 data-nosnippet>135</a> /// a read syscall dropping and therefore terminating the process is our best option. |
| <a href=#136 id=136 data-nosnippet>136</a> </span>child: JodGroupChild, |
| <a href=#137 id=137 data-nosnippet>137</a> thread: stdx::thread::JoinHandle<io::Result<(bool, String)>>, |
| <a href=#138 id=138 data-nosnippet>138</a> program: OsString, |
| <a href=#139 id=139 data-nosnippet>139</a> arguments: Vec<OsString>, |
| <a href=#140 id=140 data-nosnippet>140</a> current_dir: <span class="prelude-ty">Option</span><PathBuf>, |
| <a href=#141 id=141 data-nosnippet>141</a> _phantom: PhantomData<T>, |
| <a href=#142 id=142 data-nosnippet>142</a>} |
| <a href=#143 id=143 data-nosnippet>143</a> |
| <a href=#144 id=144 data-nosnippet>144</a><span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>CommandHandle<T> { |
| <a href=#145 id=145 data-nosnippet>145</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#146 id=146 data-nosnippet>146</a> f.debug_struct(<span class="string">"CommandHandle"</span>) |
| <a href=#147 id=147 data-nosnippet>147</a> .field(<span class="string">"program"</span>, <span class="kw-2">&</span><span class="self">self</span>.program) |
| <a href=#148 id=148 data-nosnippet>148</a> .field(<span class="string">"arguments"</span>, <span class="kw-2">&</span><span class="self">self</span>.arguments) |
| <a href=#149 id=149 data-nosnippet>149</a> .field(<span class="string">"current_dir"</span>, <span class="kw-2">&</span><span class="self">self</span>.current_dir) |
| <a href=#150 id=150 data-nosnippet>150</a> .finish() |
| <a href=#151 id=151 data-nosnippet>151</a> } |
| <a href=#152 id=152 data-nosnippet>152</a>} |
| <a href=#153 id=153 data-nosnippet>153</a> |
| <a href=#154 id=154 data-nosnippet>154</a><span class="kw">impl</span><T: Sized + Send + <span class="lifetime">'static</span>> CommandHandle<T> { |
| <a href=#155 id=155 data-nosnippet>155</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>spawn( |
| <a href=#156 id=156 data-nosnippet>156</a> <span class="kw-2">mut </span>command: Command, |
| <a href=#157 id=157 data-nosnippet>157</a> parser: <span class="kw">impl </span>JsonLinesParser<T>, |
| <a href=#158 id=158 data-nosnippet>158</a> sender: Sender<T>, |
| <a href=#159 id=159 data-nosnippet>159</a> out_file: <span class="prelude-ty">Option</span><Utf8PathBuf>, |
| <a href=#160 id=160 data-nosnippet>160</a> ) -> anyhow::Result<<span class="self">Self</span>> { |
| <a href=#161 id=161 data-nosnippet>161</a> command.stdout(Stdio::piped()).stderr(Stdio::piped()).stdin(Stdio::null()); |
| <a href=#162 id=162 data-nosnippet>162</a> |
| <a href=#163 id=163 data-nosnippet>163</a> <span class="kw">let </span>program = command.get_program().into(); |
| <a href=#164 id=164 data-nosnippet>164</a> <span class="kw">let </span>arguments = command.get_args().map(|arg| arg.into()).collect::<Vec<OsString>>(); |
| <a href=#165 id=165 data-nosnippet>165</a> <span class="kw">let </span>current_dir = command.get_current_dir().map(|arg| arg.to_path_buf()); |
| <a href=#166 id=166 data-nosnippet>166</a> |
| <a href=#167 id=167 data-nosnippet>167</a> <span class="kw">let </span><span class="kw-2">mut </span>child = StdCommandWrap::from(command); |
| <a href=#168 id=168 data-nosnippet>168</a> <span class="attr">#[cfg(unix)] |
| <a href=#169 id=169 data-nosnippet>169</a> </span>child.wrap(process_wrap::std::ProcessSession); |
| <a href=#170 id=170 data-nosnippet>170</a> <span class="attr">#[cfg(windows)] |
| <a href=#171 id=171 data-nosnippet>171</a> </span>child.wrap(process_wrap::std::JobObject); |
| <a href=#172 id=172 data-nosnippet>172</a> <span class="kw">let </span><span class="kw-2">mut </span>child = child |
| <a href=#173 id=173 data-nosnippet>173</a> .spawn() |
| <a href=#174 id=174 data-nosnippet>174</a> .map(JodGroupChild) |
| <a href=#175 id=175 data-nosnippet>175</a> .with_context(|| <span class="string">"Failed to spawn command: {child:?}"</span>)<span class="question-mark">?</span>; |
| <a href=#176 id=176 data-nosnippet>176</a> |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw">let </span>stdout = child.<span class="number">0</span>.stdout().take().unwrap(); |
| <a href=#178 id=178 data-nosnippet>178</a> <span class="kw">let </span>stderr = child.<span class="number">0</span>.stderr().take().unwrap(); |
| <a href=#179 id=179 data-nosnippet>179</a> |
| <a href=#180 id=180 data-nosnippet>180</a> <span class="kw">let </span>actor = CommandActor::<T>::new(parser, sender, stdout, stderr); |
| <a href=#181 id=181 data-nosnippet>181</a> <span class="kw">let </span>thread = |
| <a href=#182 id=182 data-nosnippet>182</a> stdx::thread::Builder::new(stdx::thread::ThreadIntent::Worker, <span class="string">"CommandHandle"</span>) |
| <a href=#183 id=183 data-nosnippet>183</a> .spawn(<span class="kw">move </span>|| actor.run(out_file)) |
| <a href=#184 id=184 data-nosnippet>184</a> .expect(<span class="string">"failed to spawn thread"</span>); |
| <a href=#185 id=185 data-nosnippet>185</a> <span class="prelude-val">Ok</span>(CommandHandle { program, arguments, current_dir, child, thread, _phantom: PhantomData }) |
| <a href=#186 id=186 data-nosnippet>186</a> } |
| <a href=#187 id=187 data-nosnippet>187</a> |
| <a href=#188 id=188 data-nosnippet>188</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>cancel(<span class="kw-2">mut </span><span class="self">self</span>) { |
| <a href=#189 id=189 data-nosnippet>189</a> <span class="kw">let _ </span>= <span class="self">self</span>.child.<span class="number">0</span>.kill(); |
| <a href=#190 id=190 data-nosnippet>190</a> <span class="kw">let _ </span>= <span class="self">self</span>.child.<span class="number">0</span>.wait(); |
| <a href=#191 id=191 data-nosnippet>191</a> } |
| <a href=#192 id=192 data-nosnippet>192</a> |
| <a href=#193 id=193 data-nosnippet>193</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>join(<span class="kw-2">mut </span><span class="self">self</span>) -> io::Result<()> { |
| <a href=#194 id=194 data-nosnippet>194</a> <span class="kw">let </span>exit_status = <span class="self">self</span>.child.<span class="number">0</span>.wait()<span class="question-mark">?</span>; |
| <a href=#195 id=195 data-nosnippet>195</a> <span class="kw">let </span>(read_at_least_one_message, error) = <span class="self">self</span>.thread.join()<span class="question-mark">?</span>; |
| <a href=#196 id=196 data-nosnippet>196</a> <span class="kw">if </span>read_at_least_one_message || exit_status.success() { |
| <a href=#197 id=197 data-nosnippet>197</a> <span class="prelude-val">Ok</span>(()) |
| <a href=#198 id=198 data-nosnippet>198</a> } <span class="kw">else </span>{ |
| <a href=#199 id=199 data-nosnippet>199</a> <span class="prelude-val">Err</span>(io::Error::other(<span class="macro">format!</span>( |
| <a href=#200 id=200 data-nosnippet>200</a> <span class="string">"Cargo watcher failed, the command produced no valid metadata (exit code: {exit_status:?}):\n{error}" |
| <a href=#201 id=201 data-nosnippet>201</a> </span>))) |
| <a href=#202 id=202 data-nosnippet>202</a> } |
| <a href=#203 id=203 data-nosnippet>203</a> } |
| <a href=#204 id=204 data-nosnippet>204</a> |
| <a href=#205 id=205 data-nosnippet>205</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>has_exited(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <a href=#206 id=206 data-nosnippet>206</a> <span class="kw">match </span><span class="self">self</span>.child.<span class="number">0</span>.try_wait() { |
| <a href=#207 id=207 data-nosnippet>207</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(_exit_code)) => { |
| <a href=#208 id=208 data-nosnippet>208</a> <span class="comment">// We have an exit code. |
| <a href=#209 id=209 data-nosnippet>209</a> </span><span class="bool-val">true |
| <a href=#210 id=210 data-nosnippet>210</a> </span>} |
| <a href=#211 id=211 data-nosnippet>211</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) => { |
| <a href=#212 id=212 data-nosnippet>212</a> <span class="comment">// Hasn't exited yet. |
| <a href=#213 id=213 data-nosnippet>213</a> </span><span class="bool-val">false |
| <a href=#214 id=214 data-nosnippet>214</a> </span>} |
| <a href=#215 id=215 data-nosnippet>215</a> <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <a href=#216 id=216 data-nosnippet>216</a> <span class="comment">// Couldn't get an exit code. Assume that we've |
| <a href=#217 id=217 data-nosnippet>217</a> // exited. |
| <a href=#218 id=218 data-nosnippet>218</a> </span><span class="bool-val">true |
| <a href=#219 id=219 data-nosnippet>219</a> </span>} |
| <a href=#220 id=220 data-nosnippet>220</a> } |
| <a href=#221 id=221 data-nosnippet>221</a> } |
| <a href=#222 id=222 data-nosnippet>222</a>} |
| </code></pre></div></section></main></body></html> |
