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@listochkin

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@RustUkraine

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Rust

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Modern Language

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Markdown for Comments

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Build-in Unit testing

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Tests for code in the docs

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Package manager Cargo.toml Cargo.lock Multiple Versions

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Learning by Doing

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“System”

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Drop-in replacement for C

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Rust => .so / .dylib / .dll Node / Ruby / Python

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Drivers Desktop Software Mobile Apps Servers IoT

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Adoption: Project Infrastructure IDE / Editor integration CI / CD

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Add a few lines to a Dockerfile?

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One-off Scripts

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Ad-hoc data processing

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Troubleshooting

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Custom metrics / healthchecks

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Personal Workflows

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Bash Perl Ruby / Python Node

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find … | grep … | sed … | … > result.txt

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ssh + netcat + custom UNIX sockets

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Scripts for individual steps

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/regex/

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sed => perl

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small “programs”

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$EDITOR transform.lang chmod +x transform.lang ./transform.lang

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Rust?!

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cargo new omg-how-to-name-it cd omg-how-to-name-it cargo build ...

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Many files A new repository

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Not something temporary

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Not scripting

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cargo eval

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cargo install cargo-eval $EDITOR hello.rs

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#!/usr/bin/env cargo eval -- fn main() { println!("Hello world!"); }

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chmod +x hello.rs ./hello.rs Hello world!

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OMG!

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Rust Scripting

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Cargo Eval supports Cargo modules

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#!/usr/bin/env cargo eval -- //! ```cargo //! [dependencies] //! time = "0.1.25" //! ``` extern crate time; fn main() { println!("{}", time::now().rfc822z()); }

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#!/usr/bin/env cargo eval -- //! ```cargo //! [package] //! edition = "2018" //! [dependencies] //! time = "0.1.25" //! ``` fn main() { println!("{}", time::now().rfc822z()); }

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#!/usr/bin/env cargo eval -- use std::io::*; fn main() -> Result<()> { for (n, line) in stdin().lock().lines().enumerate() { let line = line?; let line = line.trim_end(); if line.is_empty() { eprintln!("warning: empty line!"); } println!("{:>6}: {}", n, line.trim_end()) } Ok(()) }

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Text Processing

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str Strict UTF-8 not CESU-8 not Java Modified UTF-8

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str ⇔ String OsStr ⇔ OsString Path ⇔ PathBuf CStr ⇔ CString

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unicode_normalization unicode_segmentation

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let s = "a\u{30a}"; assert_eq!(s.nfc().collect::(), "å");

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let s = "a̐éö̲\r\na\u{30a}"; let g: Vec<&str> = UnicodeSegmentation::graphemes(s, true) .collect(); let b = &["a̐", "é", "ö̲", "\r\n", "a\u{30a}"]; assert_eq!(g, b);

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Case Folding

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caseless

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assert_eq!( canonical_caseless_match_str("Office", "office"), true); assert_eq!( canonical_caseless_match_str("straße", "Strasse"), true);

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regex

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Extended Syntax Unicode Named Capture Groups

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No backreferences No conditionals No subroutines No recursion

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Sad :(

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lazy_static! { static ref RE: Regex = Regex::new( r"(?xu) #US date (?P \d{2} ) # the month / (?P \d{2} ) # the day / (?P \d{4} ) # the year ", ) .unwrap(); } let before = "01/30/2018, 12/12/2019"; let after = RE.replace_all(before, "$y-$m-$d"); assert_eq!(after, "2018-01-30, 2019-12-12");

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pcre2 ?

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Running external commands

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duct

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use duct::cmd; cmd!( "osascript", "-e", "display notification \"Hello from Rust\" with title \"CLI\"" ) .run()?;

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Ergonomics

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quicli

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create_dir remove_dir_all glob read_file write_to_file

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CliResult logger CLI arguments Parallel Iterators

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Drawbacks

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So many crates!

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Rust Regexes :/

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Extra care is needed

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What’s good?

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rustfmt ./your-script.rs

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Compiler helps

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Doesn’t have to deal with Traits Borrow Checker

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Compile most deps once

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If you script often compilation time isn’t an issue

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Rust Scripting is real

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… | rust | …

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