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Use quick_main in examples

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David Tolnay 2017-05-17 10:23:04 -07:00
parent 9467df216a
commit 87da3d5766
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4 changed files with 232 additions and 117 deletions
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51
src/app.md
View file

@ -132,7 +132,8 @@ Your favorite number must be 256.
extern crate log;
extern crate env_logger;
use log::SetLoggerError;
#[macro_use]
extern crate error_chain;
mod foo {
mod bar {
@ -151,7 +152,13 @@ mod foo {
}
}
fn run() -> Result<(), SetLoggerError> {
error_chain! {
foreign_links {
SetLogger(log::SetLoggerError);
}
}
fn run() -> Result<()> {
env_logger::init()?;
warn!("[root] warn");
info!("[root] info");
@ -161,9 +168,7 @@ fn run() -> Result<(), SetLoggerError> {
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[`env_logger`][env_logger] output is controlled by [`RUST_LOG`] environmental
@ -200,7 +205,10 @@ via [`log::set_logger`]. Messages are logged to stdout.
#[macro_use]
extern crate log;
use log::{LogRecord, LogLevel, LogMetadata, LogLevelFilter, SetLoggerError};
#[macro_use]
extern crate error_chain;
use log::{LogRecord, LogLevel, LogMetadata, LogLevelFilter};
struct ConsoleLogger;
@ -216,7 +224,13 @@ impl log::Log for ConsoleLogger {
}
}
fn run() -> Result<(), SetLoggerError> {
error_chain! {
foreign_links {
SetLogger(log::SetLoggerError);
}
}
fn run() -> Result<()> {
log::set_logger(|max_log_level| {
max_log_level.set(LogLevelFilter::Info);
Box::new(ConsoleLogger)
@ -228,9 +242,7 @@ fn run() -> Result<(), SetLoggerError> {
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-log-syslog]: #ex-log-syslog
@ -246,23 +258,30 @@ with [`syslog::init`].
and `Option<&str>` holds optional application name.
```rust,no_run
#[macro_use] extern crate log;
#[macro_use]
extern crate log;
extern crate syslog;
use log::{LogLevelFilter, SetLoggerError};
#[macro_use]
extern crate error_chain;
use log::LogLevelFilter;
use syslog::Facility;
error_chain! {
foreign_links {
SetLogger(log::SetLoggerError);
}
}
fn run() -> Result<(), SetLoggerError> {
fn run() -> Result<()> {
syslog::init(Facility::LOG_USER, LogLevelFilter::Debug, Some("My app name"))?;
debug!("this is a debug {}", "message");
error!("this is an error!");
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-log-custom]: #ex-log-custom

38
src/basics.md
View file

@ -24,10 +24,19 @@ that implements [`Write`], here a [`File`]. The [`File`] is opened
for writing with [`File::create`], and reading with [`File::open`].
```rust
use std::fs::File;
use std::io::{self, Write, BufReader, BufRead};
#[macro_use]
extern crate error_chain;
fn run() -> io::Result<()> {
use std::fs::File;
use std::io::{Write, BufReader, BufRead};
error_chain! {
foreign_links {
Io(std::io::Error);
}
}
fn run() -> Result<()> {
let path = "lines.txt";
let mut output = File::create(path)?;
@ -43,9 +52,7 @@ fn run() -> io::Result<()> {
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-byteorder-le]: #ex-byteorder-le
@ -57,7 +64,8 @@ fn main() {
```rust
extern crate byteorder;
use std::io;
#[macro_use]
extern crate error_chain;
use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
@ -67,7 +75,13 @@ struct Payload {
value: u16,
}
fn run() -> io::Result<()> {
error_chain! {
foreign_links {
Io(std::io::Error);
}
}
fn run() -> Result<()> {
let original_payload = Payload::default();
let encoded_bytes = encode(&original_payload)?;
let decoded_payload = decode(&encoded_bytes)?;
@ -75,14 +89,14 @@ fn run() -> io::Result<()> {
Ok(())
}
fn encode(payload: &Payload) -> io::Result<Vec<u8>> {
fn encode(payload: &Payload) -> Result<Vec<u8>> {
let mut bytes = vec![];
bytes.write_u8(payload.kind)?;
bytes.write_u16::<LittleEndian>(payload.value)?;
Ok(bytes)
}
fn decode(mut bytes: &[u8]) -> io::Result<Payload> {
fn decode(mut bytes: &[u8]) -> Result<Payload> {
let payload = Payload {
kind: bytes.read_u8()?,
value: bytes.read_u16::<LittleEndian>()?,
@ -90,9 +104,7 @@ fn decode(mut bytes: &[u8]) -> io::Result<Payload> {
Ok(payload)
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-rand-float]: #ex-rand-float

51
src/encoding.md
View file

@ -32,9 +32,18 @@ we expect the parsed value to be. The expected value is declared using the
#[macro_use]
extern crate serde_json;
#[macro_use]
extern crate error_chain;
use serde_json::Value;
fn main() {
error_chain! {
foreign_links {
Json(serde_json::Error);
}
}
fn run() -> Result<()> {
let j = r#"{
"userid": 103609,
"verified": true,
@ -44,7 +53,7 @@ fn main() {
]
}"#;
let parsed: Value = serde_json::from_str(j).unwrap();
let parsed: Value = serde_json::from_str(j)?;
let expected = json!({
"userid": 103609,
@ -56,7 +65,11 @@ fn main() {
});
assert_eq!(parsed, expected);
Ok(())
}
quick_main!(run);
```
[ex-toml-config]: #ex-toml-config
@ -71,9 +84,18 @@ valid TOML data.
```rust
extern crate toml;
#[macro_use]
extern crate error_chain;
use toml::Value;
fn main() {
error_chain! {
foreign_links {
Toml(toml::de::Error);
}
}
fn run() -> Result<()> {
let toml_content = r#"
[package]
name = "your_package"
@ -84,11 +106,15 @@ fn main() {
serde = "1.0"
"#;
let package_info: Value = toml::from_str(toml_content).unwrap();
let package_info: Value = toml::from_str(toml_content)?;
assert_eq!(package_info["dependencies"]["serde"].as_str(), Some("1.0"));
assert_eq!(package_info["package"]["name"].as_str(), Some("your_package"));
Ok(())
}
quick_main!(run);
```
Parse TOML into your own structs using Serde:
@ -102,6 +128,9 @@ extern crate serde_derive;
extern crate serde;
extern crate toml;
#[macro_use]
extern crate error_chain;
use std::collections::HashMap;
#[derive(Deserialize)]
@ -117,7 +146,13 @@ struct Package {
authors: Vec<String>,
}
fn main() {
error_chain! {
foreign_links {
Toml(toml::de::Error);
}
}
fn run() -> Result<()> {
let toml_content = r#"
[package]
name = "your_package"
@ -128,13 +163,17 @@ fn main() {
serde = "1.0"
"#;
let package_info: Config = toml::from_str(toml_content).unwrap();
let package_info: Config = toml::from_str(toml_content)?;
assert_eq!(package_info.package.name, "your_package");
assert_eq!(package_info.package.version, "0.1.0");
assert_eq!(package_info.package.authors, vec!["You! <you@example.org>"]);
assert_eq!(package_info.dependencies["serde"], "1.0");
Ok(())
}
quick_main!(run);
```
<!-- Categories -->

177
src/net.md
View file

@ -31,21 +31,27 @@ URL will print a message containing an explanation of what went wrong.
```rust
extern crate url;
#[macro_use]
extern crate error_chain;
use url::Url;
fn main() {
let s = "https://github.com/rust-lang/rust/issues?labels=E-easy&state=open";
match Url::parse(s) {
Ok(url) => {
println!("Successfully parsed the URL.");
println!("The path part of the URL is: {}", url.path());
}
Err(err) => {
println!("Failed to parse the URL: {}", err);
}
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
}
fn run() -> Result<()> {
let s = "https://github.com/rust-lang/rust/issues?labels=E-easy&state=open";
let parsed = Url::parse(s)?;
println!("The path part of the URL is: {}", parsed.path());
Ok(())
}
quick_main!(run);
```
[ex-url-base]: #ex-url-base
@ -57,39 +63,35 @@ fn main() {
```rust
extern crate url;
use url::{Url, ParseError};
use url::Url;
#[macro_use]
extern crate error_chain;
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
errors {
CannotBeABase
}
foreign_links {
Parse(ParseError);
}
}
fn main() {
let s = "https://github.com/rust-lang/cargo?asdf";
fn run() -> Result<()> {
let full = "https://github.com/rust-lang/cargo?asdf";
let url = Url::parse(full)?;
let base = base_url(url)?;
match base_url(s) {
Ok(base) => {
assert_eq!(base.as_str(), "https://github.com/");
println!("The base of the URL is: {}", base);
}
Err(err) => {
println!("Failed to extract base URL: {}", err);
}
}
Ok(())
}
/// Returns the base of the given URL - the part not including any path segments
/// and query parameters.
fn base_url(full: &str) -> Result<Url> {
let mut url = Url::parse(full)?;
fn base_url(mut url: Url) -> Result<Url> {
// Clear path segments.
match url.path_segments_mut() {
Ok(mut path) => {
@ -106,6 +108,8 @@ fn base_url(full: &str) -> Result<Url> {
Ok(url)
}
quick_main!(run);
```
[ex-url-new-from-base]: #ex-url-new-from-base
@ -119,29 +123,39 @@ The [`join`] method creates a new URL from a base and relative path.
```rust
extern crate url;
use url::{Url, ParseError};
#[macro_use]
extern crate error_chain;
fn main() {
let path = "/rust-lang/cargo";
use url::Url;
match build_github_url(path) {
Ok(url) => {
assert_eq!(url.as_str(), "https://github.com/rust-lang/cargo");
println!("The joined URL is: {}", url);
}
Err(err) => {
println!("Failed to build GitHub URL: {}", err);
}
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
}
fn build_github_url(path: &str) -> Result<Url, ParseError> {
fn run() -> Result<()> {
let path = "/rust-lang/cargo";
let gh = build_github_url(path)?;
assert_eq!(gh.as_str(), "https://github.com/rust-lang/cargo");
println!("The joined URL is: {}", gh);
Ok(())
}
fn build_github_url(path: &str) -> Result<Url> {
// Hardcoded in our program. Caller's path will be joined to this.
const GITHUB: &'static str = "https://github.com";
let base = Url::parse(GITHUB).expect("hardcoded URL is known to be valid");
base.join(path)
let joined = base.join(path)?;
Ok(joined)
}
quick_main!(run);
```
[ex-url-origin]: #ex-url-origin
@ -156,23 +170,31 @@ it represents.
```rust
extern crate url;
#[macro_use]
extern crate error_chain;
use url::{Url, Host};
fn main() {
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
}
fn run() -> Result<()> {
let s = "ftp://rust-lang.org/examples";
match Url::parse(s) {
Ok(url) => {
let url = Url::parse(s)?;
assert_eq!(url.scheme(), "ftp");
assert_eq!(url.host(), Some(Host::Domain("rust-lang.org")));
assert_eq!(url.port_or_known_default(), Some(21));
println!("The origin is as expected!");
}
Err(err) => {
println!("Failed to parse the URL: {}", err);
}
}
Ok(())
}
quick_main!(run);
```
The same result can be obtained using the [`origin`] method as well.
@ -180,13 +202,22 @@ The same result can be obtained using the [`origin`] method as well.
```rust
extern crate url;
#[macro_use]
extern crate error_chain;
use url::{Url, Origin, Host};
fn main() {
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
}
fn run() -> Result<()> {
let s = "ftp://rust-lang.org/examples";
match Url::parse(s) {
Ok(url) => {
let url = Url::parse(s)?;
let expected_scheme = "ftp".to_owned();
let expected_host = Host::Domain("rust-lang.org".to_owned());
let expected_port = 21;
@ -195,12 +226,11 @@ fn main() {
let origin = url.origin();
assert_eq!(origin, expected);
println!("The origin is as expected!");
}
Err(err) => {
println!("Failed to parse the URL: {}", err);
}
}
Ok(())
}
quick_main!(run);
```
[ex-url-rm-frag]: #ex-url-rm-frag
@ -214,18 +244,25 @@ Once [`Url`] is parsed it can be sliced with [`url::Position`] to strip unneeded
```rust
extern crate url;
#[macro_use]
extern crate error_chain;
use url::{Url, Position};
fn run() -> Result<(), url::ParseError> {
error_chain! {
foreign_links {
UrlParse(url::ParseError);
}
}
fn run() -> Result<()> {
let parsed = Url::parse("https://github.com/rust-lang/rust/issues?labels=E-easy&state=open")?;
let cleaned: &str = &parsed[..Position::AfterPath];
println!("cleaned: {}", cleaned);
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-url-basic]: #ex-url-basic
@ -338,6 +375,9 @@ GitHub [stargazers API v3](https://developer.github.com/v3/activity/starring/#li
extern crate serde_derive;
extern crate reqwest;
#[macro_use]
extern crate error_chain;
#[derive(Deserialize, Debug)]
struct User {
login: String,
@ -345,7 +385,13 @@ struct User {
// remaining fields not deserialized for brevity
}
fn run() -> reqwest::Result<()> {
error_chain! {
foreign_links {
Reqwest(reqwest::Error);
}
}
fn run() -> Result<()> {
let request_url = format!("https://api.github.com/repos/{owner}/{repo}/stargazers",
owner = "brson",
repo = "rust-cookbook");
@ -357,9 +403,7 @@ fn run() -> reqwest::Result<()> {
Ok(())
}
fn main() {
run().unwrap();
}
quick_main!(run);
```
[ex-rest-post]: #ex-rest-post
@ -376,14 +420,15 @@ Request is prepared with [`Client::post`], authenticated with [`RequestBuilder::
Gist is subsequently deleted with HTTP DELETE request prepared with [`Client::delete`] and executed as before.
```rust,no_run
#[macro_use]
extern crate error_chain;
extern crate reqwest;
#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate serde_json;
#[macro_use]
extern crate error_chain;
use std::env;
error_chain! {