Consider offering a way to specify command line arguments

[intendo]

I want to test command line argument parsing. How do you supply command line arguments or environment variables to playground?

[shepmaster]

supply command line arguments

You cannot currently. I've changed this issue to track that as a possible enhancement.

or environment variables

std::env::set_var

test command line argument parsing

I'd pass a string or an iterator of strings to the parsing code. See how clap does something similar

[intendo]

This could be a candidate for an FAQ and not really a bug or extra feature. I was able to get it working with your suggestion. Thanks! The only things I changed from the clap exampl<https://github.com/clap-rs/clap#quick-example>e are highlighted in bold in the code below. ------------------------------------------------------------------------------------------ extern crate clap; use clap::{App, Arg, SubCommand}; fn main() { let arg_vec = vec![ "my_prog", "input_file", "--config", "args", "-v", "-v", "-v", "test", ]; let matches = App::new("My Super Program") .version("1.0") .author("Kevin K. <kbknapp@gmail.com>") .about("Does awesome things") .arg( Arg::with_name("config") .short("c") .long("config") .value_name("FILE") .help("Sets a custom config file") .takes_value(true), ).arg( Arg::with_name("INPUT") .help("Sets the input file to use") .required(true) .index(1), ).arg( Arg::with_name("v") .short("v") .multiple(true) .help("Sets the level of verbosity"), ).subcommand( SubCommand::with_name("test") .about("controls testing features") .version("1.3") .author("Someone E. <someone_else@other.com>") .arg( Arg::with_name("debug") .short("d") .help("print debug information verbosely"), ), ).get_matches_from(arg_vec); // Gets a value for config if supplied by user, or defaults to "default.conf" let config = matches.value_of("config").unwrap_or("default.conf"); println!("Value for config: {}", config); // Calling .unwrap() is safe here because "INPUT" is required (if "INPUT" wasn't // required we could have used an 'if let' to conditionally get the value) println!("Using input file: {}", matches.value_of("INPUT").unwrap()); // Vary the output based on how many times the user used the "verbose" flag // (i.e. 'myprog -v -v -v' or 'myprog -vvv' vs 'myprog -v' match matches.occurrences_of("v") { 0 => println!("No verbose info"), 1 => println!("Some verbose info"), 2 => println!("Tons of verbose info"), 3 | _ => println!("Don't be crazy"), } // You can handle information about subcommands by requesting their matches by name // (as below), requesting just the name used, or both at the same time if let Some(matches) = matches.subcommand_matches("test") { if matches.is_present("debug") { println!("Printing debug info..."); } else { println!("Printing normally..."); } } // more program logic goes here... } ------------------------------------------------------------------------------------------ From: Jake Goulding <notifications@github.com> Reply-To: integer32llc/rust-playground <reply@reply.github.com> Date: Wednesday, August 1, 2018 at 4:28 PM To: integer32llc/rust-playground <rust-playground@noreply.github.com> Cc: "Curtis, Darren S" <Darren.Curtis@pnnl.gov>, Author <author@noreply.github.com> Subject: Re: [integer32llc/rust-playground] Consider offering a way to specify standard input (#371) supply command line arguments You cannot currently. I've changed this issue to track that as a possible enhancement. or environment variables std::env::set_var<https://doc.rust-lang.org/std/env/fn.set_var.html> test command line argument parsing I'd pass a string or an iterator of strings to the parsing code. See how clap does something similar<https://docs.rs/clap/2.32.0/clap/struct.App.html#method.get_matches_from> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#371 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AGRGsLBBdadullqCWX4TCBQB5I9YxS6sks5uMjlcgaJpZM4VrFLN>.