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haraldh 2020-03-03 14:08:09 +00:00
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commit bc07729890
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8
ayu-highlight.css
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@ -69,3 +69,11 @@ Original by Dempfi (https://github.com/dempfi/ayu)
.hljs-strong {
font-weight: bold;
}
.hljs-addition {
color: #91b362;
}
.hljs-deletion {
color: #d96c75;
}

4
clipboard.min.js vendored
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102
css/chrome.css
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@ -8,7 +8,9 @@
::-webkit-scrollbar-thumb {
background: var(--scrollbar);
}
html {
scrollbar-color: var(--scrollbar) var(--bg);
}
#searchresults a,
.content a:link,
a:visited,
@ -43,7 +45,7 @@ a > .hljs {
position: relative;
padding: 0 8px;
z-index: 10;
line-height: 50px;
line-height: var(--menu-bar-height);
cursor: pointer;
transition: color 0.5s;
}
@ -71,7 +73,7 @@ a > .hljs {
}
html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-container {
transform: translateY(-60px);
transform: translateY(calc(-10px - var(--menu-bar-height)));
}
.left-buttons {
@ -85,8 +87,8 @@ html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-conta
.menu-title {
display: inline-block;
font-weight: 200;
font-size: 20px;
line-height: 50px;
font-size: 2rem;
line-height: var(--menu-bar-height);
text-align: center;
margin: 0;
flex: 1;
@ -124,7 +126,7 @@ html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-conta
text-decoration: none;
position: fixed;
top: 50px; /* Height of menu-bar */
top: 0;
bottom: 0;
margin: 0;
max-width: 150px;
@ -135,10 +137,14 @@ html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-conta
align-content: center;
flex-direction: column;
transition: color 0.5s;
transition: color 0.5s, background-color 0.5s;
}
.nav-chapters:hover { text-decoration: none; }
.nav-chapters:hover {
text-decoration: none;
background-color: var(--theme-hover);
transition: background-color 0.15s, color 0.15s;
}
.nav-wrapper {
margin-top: 50px;
@ -176,11 +182,14 @@ html:not(.sidebar-visible) #menu-bar:not(:hover).folded > #menu-bar-sticky-conta
/* Inline code */
:not(pre) > .hljs {
display: inline-block;
vertical-align: middle;
display: inline;
padding: 0.1em 0.3em;
border-radius: 3px;
}
:not(pre):not(a) > .hljs {
color: var(--inline-code-color);
overflow-x: initial;
}
a:hover > .hljs {
@ -301,8 +310,6 @@ ul#searchresults span.teaser em {
top: 0;
bottom: 0;
width: var(--sidebar-width);
overflow-y: auto;
padding: 10px 10px;
font-size: 0.875em;
box-sizing: border-box;
-webkit-overflow-scrolling: touch;
@ -310,12 +317,39 @@ ul#searchresults span.teaser em {
background-color: var(--sidebar-bg);
color: var(--sidebar-fg);
}
.js .sidebar {
.sidebar-resizing {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
user-select: none;
}
.js:not(.sidebar-resizing) .sidebar {
transition: transform 0.3s; /* Animation: slide away */
}
.sidebar code {
line-height: 2em;
}
.sidebar .sidebar-scrollbox {
overflow-y: auto;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
padding: 10px 10px;
}
.sidebar .sidebar-resize-handle {
position: absolute;
cursor: col-resize;
width: 0;
right: 0;
top: 0;
bottom: 0;
}
.js .sidebar .sidebar-resize-handle {
cursor: col-resize;
width: 5px;
}
.sidebar-hidden .sidebar {
transform: translateX(calc(0px - var(--sidebar-width)));
}
@ -341,22 +375,52 @@ ul#searchresults span.teaser em {
padding-left: 0;
line-height: 2.2em;
}
.chapter ol {
width: 100%;
}
.chapter li {
display: flex;
color: var(--sidebar-non-existant);
}
.chapter li a {
color: var(--sidebar-fg);
display: block;
padding: 0;
text-decoration: none;
color: var(--sidebar-fg);
}
.chapter li a:hover { text-decoration: none }
.chapter li .active,
a:hover {
/* Animate color change */
.chapter li a:hover {
color: var(--sidebar-active);
}
.chapter li a.active {
color: var(--sidebar-active);
}
.chapter li > a.toggle {
cursor: pointer;
display: block;
margin-left: auto;
padding: 0 10px;
user-select: none;
opacity: 0.68;
}
.chapter li > a.toggle div {
transition: transform 0.5s;
}
/* collapse the section */
.chapter li:not(.expanded) + li > ol {
display: none;
}
.chapter li.expanded > a.toggle div {
transform: rotate(90deg);
}
.spacer {
width: 100%;
height: 3px;
@ -382,7 +446,7 @@ a:hover {
.theme-popup {
position: absolute;
left: 10px;
top: 50px;
top: var(--menu-bar-height);
z-index: 1000;
border-radius: 4px;
font-size: 0.7em;

33
css/general.css
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@ -2,6 +2,11 @@
@import 'variables.css';
:root {
/* Browser default font-size is 16px, this way 1 rem = 10px */
font-size: 62.5%;
}
html {
font-family: "Open Sans", sans-serif;
color: var(--fg);
@ -11,19 +16,20 @@ html {
body {
margin: 0;
font-size: 1rem;
font-size: 1.6rem;
overflow-x: hidden;
}
code {
font-family: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace;
font-family: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace !important;
font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
}
.left { float: left; }
.right { float: right; }
.boring { opacity: 0.6; }
.hide-boring .boring { display: none; }
.hidden { display: none; }
.play-button.hidden { display: none; }
h2, h3 { margin-top: 2.5em; }
h4, h5 { margin-top: 2em; }
@ -34,16 +40,23 @@ h4, h5 { margin-top: 2em; }
margin-top: 1em;
}
a.header:target h1:before,
a.header:target h2:before,
a.header:target h3:before,
a.header:target h4:before {
h1 a.header:target::before,
h2 a.header:target::before,
h3 a.header:target::before,
h4 a.header:target::before {
display: inline-block;
content: "»";
margin-left: -30px;
width: 30px;
}
h1 a.header:target,
h2 a.header:target,
h3 a.header:target,
h4 a.header:target {
scroll-margin-top: calc(var(--menu-bar-height) + 0.5em);
}
.page {
outline: 0;
padding: 0 var(--page-padding);
@ -51,7 +64,7 @@ a.header:target h4:before {
.page-wrapper {
box-sizing: border-box;
}
.js .page-wrapper {
.js:not(.sidebar-resizing) .page-wrapper {
transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
}
@ -92,6 +105,9 @@ table thead td {
font-weight: 700;
border: none;
}
table thead th {
padding: 3px 20px;
}
table thead tr {
border: 1px var(--table-header-bg) solid;
}
@ -141,4 +157,3 @@ blockquote {
.tooltipped .tooltiptext {
visibility: visible;
}

43
css/variables.css
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@ -5,6 +5,7 @@
--sidebar-width: 300px;
--page-padding: 15px;
--content-max-width: 750px;
--menu-bar-height: 50px;
}
/* Themes */
@ -208,3 +209,45 @@
--searchresults-li-bg: #dec2a2;
--search-mark-bg: #e69f67;
}
@media (prefers-color-scheme: dark) {
.light.no-js {
--bg: hsl(200, 7%, 8%);
--fg: #98a3ad;
--sidebar-bg: #292c2f;
--sidebar-fg: #a1adb8;
--sidebar-non-existant: #505254;
--sidebar-active: #3473ad;
--sidebar-spacer: #393939;
--scrollbar: var(--sidebar-fg);
--icons: #43484d;
--icons-hover: #b3c0cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;;
--theme-popup-bg: #141617;
--theme-popup-border: #43484d;
--theme-hover: #1f2124;
--quote-bg: hsl(234, 21%, 18%);
--quote-border: hsl(234, 21%, 23%);
--table-border-color: hsl(200, 7%, 13%);
--table-header-bg: hsl(200, 7%, 28%);
--table-alternate-bg: hsl(200, 7%, 11%);
--searchbar-border-color: #aaa;
--searchbar-bg: #b7b7b7;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #98a3ad;
--searchresults-li-bg: #2b2b2f;
--search-mark-bg: #355c7d;
}
}

34
end.html
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@ -1,9 +1,11 @@
<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js">
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>The End - chainerror</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content="A tutorial for the chainerror rust crate.">
<meta name="viewport" content="width=device-width, initial-scale=1">
@ -30,11 +32,11 @@
</head>
<body class="light">
<body>
<!-- Provide site root to javascript -->
<script type="text/javascript">
var path_to_root = "";
var default_theme = "light";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
@ -58,8 +60,11 @@
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
document.body.className = theme;
document.querySelector('html').className = theme + ' js';
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
@ -75,7 +80,10 @@
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html" class="active">The End</a></li></ol>
<div id="sidebar-scrollbox" class="sidebar-scrollbox">
<ol class="chapter"><li class="expanded affix "><a href="index.html">chainerror</a></li><li class="expanded "><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li class="expanded "><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li class="expanded "><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li class="expanded "><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li class="expanded "><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li class="expanded "><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li class="expanded "><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li class="expanded "><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li class="expanded "><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li class="expanded "><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li class="expanded "><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li class="expanded "><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="expanded "><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="expanded "><a href="tutorial14.html"><strong aria-hidden="true">14.</strong> Going back to std</a></li><li class="expanded affix "><a href="end.html" class="active">The End</a></li></ol>
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
@ -140,7 +148,7 @@
<div id="content" class="content">
<main>
<a class="header" href="#the-end" id="the-end"><h1>The End</h1></a>
<h1><a class="header" href="#the-end" id="the-end">The End</a></h1>
<p>That's it for now…</p>
<p>Happy error handling!</p>
<p>To report issues, submit pull request or for the source code, examples and the book source, visit
@ -151,7 +159,7 @@ the <a href="https://github.com/haraldh/chainerror">Git Repo</a>.</p>
<nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons -->
<a rel="prev" href="tutorial13.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<a rel="prev" href="tutorial14.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
@ -165,7 +173,7 @@ the <a href="https://github.com/haraldh/chainerror">Git Repo</a>.</p>
<nav class="nav-wide-wrapper" aria-label="Page navigation">
<a href="tutorial13.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<a href="tutorial14.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
@ -182,6 +190,14 @@ the <a href="https://github.com/haraldh/chainerror">Git Repo</a>.</p>
<script type="text/javascript">
window.playpen_copyable = true;
</script>
<script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script>
<script src="mark.min.js" type="text/javascript" charset="utf-8"></script>
<script src="searcher.js" type="text/javascript" charset="utf-8"></script>

10
highlight.css
View file

@ -67,3 +67,13 @@
.hljs-strong {
font-weight: bold;
}
.hljs-addition {
color: #22863a;
background-color: #f0fff4;
}
.hljs-deletion {
color: #b31d28;
background-color: #ffeef0;
}

4
highlight.js
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File diff suppressed because one or more lines are too long

46
index.html
View file

@ -1,9 +1,11 @@
<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js">
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>chainerror - chainerror</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content="A tutorial for the chainerror rust crate.">
<meta name="viewport" content="width=device-width, initial-scale=1">
@ -30,11 +32,11 @@
</head>
<body class="light">
<body>
<!-- Provide site root to javascript -->
<script type="text/javascript">
var path_to_root = "";
var default_theme = "light";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
@ -58,8 +60,11 @@
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
document.body.className = theme;
document.querySelector('html').className = theme + ' js';
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
@ -75,7 +80,10 @@
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
<div id="sidebar-scrollbox" class="sidebar-scrollbox">
<ol class="chapter"><li class="expanded affix "><a href="index.html" class="active">chainerror</a></li><li class="expanded "><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li class="expanded "><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li class="expanded "><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li class="expanded "><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li class="expanded "><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li class="expanded "><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li class="expanded "><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li class="expanded "><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li class="expanded "><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li class="expanded "><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li class="expanded "><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li class="expanded "><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="expanded "><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="expanded "><a href="tutorial14.html"><strong aria-hidden="true">14.</strong> Going back to std</a></li><li class="expanded affix "><a href="end.html">The End</a></li></ol>
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
@ -140,7 +148,7 @@
<div id="content" class="content">
<main>
<a class="header" href="#chainerror" id="chainerror"><h1>chainerror</h1></a>
<h1><a class="header" href="#chainerror" id="chainerror">chainerror</a></h1>
<p><a href="https://travis-ci.org/haraldh/chainerror"><img src="https://travis-ci.org/haraldh/chainerror.svg?branch=master" alt="Build Status" /></a>
<a href="https://crates.io/crates/chainerror"><img src="https://img.shields.io/crates/v/chainerror.svg" alt="Crate" /></a>
<a href="https://docs.rs/chainerror/"><img src="https://img.shields.io/badge/api-rustdoc-blue.svg" alt="Rust Documentation" /></a></p>
@ -153,7 +161,7 @@ It encapsulates all types, which have <code>Display + Debug</code> and can store
<p>Debug information is worth it!</p>
<p>Now continue reading the
<a href="https://haraldh.github.io/chainerror/tutorial1.html">Tutorial</a></p>
<a class="header" href="#example" id="example"><h2>Example:</h2></a>
<h2><a class="header" href="#example" id="example">Example:</a></h2>
<p>Output:</p>
<pre><code>$ cargo run -q --example example
Main Error Report: func1 error calling func2
@ -178,12 +186,12 @@ use std::error::Error;
use std::io;
use std::result::Result;
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
Err(io::Error::from(io::ErrorKind::NotFound))?;
Ok(())
}
fn func3() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn func3() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
let filename = &quot;foo.txt&quot;;
do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
Ok(())
@ -246,7 +254,7 @@ fn main() {
}
</code></pre>
<a class="header" href="#features" id="features"><h2>Features</h2></a>
<h2><a class="header" href="#features" id="features">Features</a></h2>
<p><code>no-fileline</code>
: completely turn off storing filename and line</p>
<p><code>display-cause</code>
@ -261,6 +269,10 @@ fn main() {
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@ -271,6 +283,10 @@ fn main() {
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@ -140,7 +148,7 @@
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<main>
<a class="header" href="#simple-string-errors" id="simple-string-errors"><h1>Simple String Errors</h1></a>
<h1><a class="header" href="#simple-string-errors" id="simple-string-errors">Simple String Errors</a></h1>
<p>An easy way of doing error handling in rust is by returning <code>String</code> as a <code>Box&lt;std::error::Error&gt;</code>.</p>
<p>If the rust <code>main</code> function returns an <code>Err()</code>, this <code>Err()</code> will be displayed with <code>std::fmt::Debug</code>.</p>
<p>As you can see by running the example (by pressing the &quot;Play&quot; button in upper right of the code block),
@ -158,29 +166,28 @@ and improves inspecting the sources of an error.</p>
use std::io;
use std::result::Result;
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
Err(io::Error::from(io::ErrorKind::NotFound))?;
Ok(())
}
fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn func2() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
if let Err(_) = do_some_io() {
Err(&quot;func2 error&quot;)?;
}
Ok(())
}
fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn func1() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
if let Err(_) = func2() {
Err(&quot;func1 error&quot;)?;
}
Ok(())
}
fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
fn main() -&gt; Result&lt;(), Box&lt;Error + Send + Sync&gt;&gt; {
func1()
}
</code></pre></pre>
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@ -227,6 +234,14 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
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<h1><a class="header" href="#going-back-to-std" id="going-back-to-std">Going back to std</a></h1>
<p>Not using <code>chainerror</code> and going full <code>std</code> would look like this:</p>
<p>Btw, the code size is bigger than using <code>chainerror</code> :-)</p>
<pre><pre class="playpen"><code class="language-rust">pub mod mycrate {
use std::error::Error as StdError;
use func2mod::{do_some_io, func2};
pub mod func2mod {
use std::error::Error as StdError;
use std::io;
pub enum ErrorKind {
IO(String),
}
impl std::fmt::Display for ErrorKind {
fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; std::fmt::Result {
match self {
ErrorKind::IO(s) =&gt; std::fmt::Display::fmt(s, f),
}
}
}
impl std::fmt::Debug for ErrorKind {
fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; std::fmt::Result {
match self {
ErrorKind::IO(s) =&gt; std::fmt::Display::fmt(s, f),
}
}
}
macro_rules! mcherr {
( $k:expr ) =&gt; {{
|e| {
Error(
$k,
Some(Box::from(e)),
Some(concat!(file!(), &quot;:&quot;, line!(), &quot;: &quot;)),
)
}
}};
}
pub struct Error(
ErrorKind,
Option&lt;Box&lt;dyn std::error::Error + 'static&gt;&gt;,
Option&lt;&amp;'static str&gt;,
);
impl Error {
pub fn kind(&amp;self) -&gt; &amp;ErrorKind {
&amp;self.0
}
}
impl From&lt;ErrorKind&gt; for Error {
fn from(e: ErrorKind) -&gt; Self {
Error(e, None, None)
}
}
impl std::error::Error for Error {
fn source(&amp;self) -&gt; Option&lt;&amp;(dyn std::error::Error + 'static)&gt; {
self.1.as_ref().map(|e| e.as_ref())
}
}
impl std::fmt::Display for Error {
fn fmt(&amp;self, f: &amp;mut std::fmt::Formatter) -&gt; std::fmt::Result {
std::fmt::Display::fmt(&amp;self.0, f)
}
}
impl std::fmt::Debug for Error {
fn fmt(&amp;self, f: &amp;mut std::fmt::Formatter) -&gt; std::fmt::Result {
if let Some(ref o) = self.2 {
std::fmt::Display::fmt(o, f)?;
}
std::fmt::Debug::fmt(&amp;self.0, f)?;
if let Some(e) = self.source() {
std::fmt::Display::fmt(&quot;\nCaused by:\n&quot;, f)?;
std::fmt::Debug::fmt(&amp;e, f)?;
}
Ok(())
}
}
pub fn do_some_io() -&gt; std::result::Result&lt;(), Box&lt;dyn std::error::Error&gt;&gt; {
Err(io::Error::from(io::ErrorKind::NotFound))?;
Ok(())
}
pub fn func2() -&gt; std::result::Result&lt;(), Error&gt; {
let filename = &quot;foo.txt&quot;;
do_some_io().map_err(mcherr!(ErrorKind::IO(format!(
&quot;Error reading '{}'&quot;,
filename
))))?;
Ok(())
}
}
#[derive(Debug)]
pub enum ErrorKind {
Func2,
IO(String),
}
impl std::fmt::Display for ErrorKind {
fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; std::fmt::Result {
match self {
ErrorKind::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
ErrorKind::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
}
}
}
macro_rules! mcherr {
( $k:expr ) =&gt; {{
|e| {
Error(
$k,
Some(Box::from(e)),
Some(concat!(file!(), &quot;:&quot;, line!(), &quot;: &quot;)),
)
}
}};
}
pub struct Error(
ErrorKind,
Option&lt;Box&lt;dyn std::error::Error + 'static&gt;&gt;,
Option&lt;&amp;'static str&gt;,
);
impl Error {
pub fn kind(&amp;self) -&gt; &amp;ErrorKind {
&amp;self.0
}
}
impl From&lt;ErrorKind&gt; for Error {
fn from(e: ErrorKind) -&gt; Self {
Error(e, None, None)
}
}
impl std::error::Error for Error {
fn source(&amp;self) -&gt; Option&lt;&amp;(dyn std::error::Error + 'static)&gt; {
self.1.as_ref().map(|e| e.as_ref())
}
}
impl std::fmt::Display for Error {
fn fmt(&amp;self, f: &amp;mut std::fmt::Formatter) -&gt; std::fmt::Result {
std::fmt::Display::fmt(&amp;self.0, f)
}
}
impl std::fmt::Debug for Error {
fn fmt(&amp;self, f: &amp;mut std::fmt::Formatter) -&gt; std::fmt::Result {
if let Some(ref o) = self.2 {
std::fmt::Display::fmt(o, f)?;
}
std::fmt::Debug::fmt(&amp;self.0, f)?;
if let Some(e) = self.source() {
std::fmt::Display::fmt(&quot;\nCaused by:\n&quot;, f)?;
std::fmt::Debug::fmt(&amp;e, f)?;
}
Ok(())
}
}
pub type Result&lt;T&gt; = std::result::Result&lt;T, Error&gt;;
pub fn func1() -&gt; Result&lt;()&gt; {
func2().map_err(mcherr!(ErrorKind::Func2))?;
let filename = String::from(&quot;bar.txt&quot;);
do_some_io().map_err(mcherr!(ErrorKind::IO(filename)))?;
Ok(())
}
}
fn main() -&gt; Result&lt;(), Box&lt;std::error::Error + Send + Sync&gt;&gt; {
use mycrate::func1;
use mycrate::ErrorKind;
use std::error::Error;
use std::io;
if let Err(e) = func1() {
match e.kind() {
ErrorKind::Func2 =&gt; eprintln!(&quot;Main Error Report: func1 error calling func2&quot;),
ErrorKind::IO(ref filename) =&gt; {
eprintln!(&quot;Main Error Report: func1 error reading '{}'&quot;, filename)
}
}
eprintln!();
let mut s: &amp;Error = &amp;e;
while let Some(c) = s.source() {
if let Some(ioerror) = c.downcast_ref::&lt;io::Error&gt;() {
eprintln!(&quot;caused by: std::io::Error: {}&quot;, ioerror);
match ioerror.kind() {
io::ErrorKind::NotFound =&gt; eprintln!(&quot;of kind: std::io::ErrorKind::NotFound&quot;),
_ =&gt; {}
}
} else {
eprintln!(&quot;caused by: {}&quot;, c);
}
s = c;
}
eprintln!(&quot;\nDebug Error:\n{:?}&quot;, e);
}
Ok(())
}
</code></pre></pre>
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