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St├ęphane Campinas
@scampi
Hi!
I am trying to reproduce a parser with awk's usage
Usage: awk [POSIX or GNU style options] -f progfile [--] file ...
Usage: awk [POSIX or GNU style options] [--] 'program' file ...
for now, i cannot manage to express that if a program is not passed in argument then -f is required
do you know if that is somehow possible ?
Cliff Dyer
@jcdyer
@phill-ridout_gitlab If you want to use raw clap, you can use matches.get("path").map(PathBuf::from). If you want more strongly typed data in general, look at the structopt crate, you can just add a path: PathBuf (or path: Option<PathBuf> field to your struct, and get what you want.
@scampi Check the documentation for ArgGroup. It looks like that may do what you want.
Hongde Liu
@enginespot
Hi , currently I am using clap , I want to log all of the commands user input , I am not sure how to do it , so can anybody help me:) Thanks.
I tried to use matches , info!("{:?}", &matches); but the output a little poor readability
Cliff Dyer
@jcdyer
If you just want the original command line invocation, you don't need clap. std::env::args() should get you the results you need.
Gabriele Bianchet-David
@Larisho
Hi! Does anyone know how to specify that an argument takes 0 or more values? This scenario isn't mentioned in the docs
Hongde Liu
@enginespot
Hi @jcdyer , I want to use clap to parse commands , and also I want to log user input , hmm... I can use std::env::args() , but the format is not very well , so if clap can format all of the command will be well:)
Benn Sundsrud
@bsundsrud
Is there a way to get a positional arg to show up after a named arg? I've got a subcommand where i've got the usage showing up as cmd subcommand <FILE> -n <SOME_VAL>
also the gitter link on https://github.com/clap-rs/clap points to non-existent gitter clap-rs/clap
in the readme
Za Wilcox
@zancas
Hi!
zancas
@zancas_gitlab
Hey folks, I was wondering what the state-of -the-art on specifying Args as enum variants? How about using StructOpt? I've looked at the blog posts, I was wondering if there were popular examples somewhere?
Justin Starry
@jstarry
Hello, thought I'd throw another question out into the wild :wink: Is there a way to specify sensitive input such as passwords via stdin somehow?
Justin Starry
@jstarry
Realized that hidden input is out of scope for a cli argument parser :) nvm!
David McNeil
@davidMcneil
I recently put together a proof-of-concept macro for easily integrating clap with a config file. I would love any feedback on the approach. It heavily relies on features in clap v3. Is there a tracking issue for the v3 release? I would love to contriute.
David McNeil
@davidMcneil
I found the v3 tracking issue clap-rs/clap#1037. However, the last update is from a while a go. Is the transition to v3 something well suited for community contribution to tackle? It would be great to get a list of outstanding issues. Thanks for the great library! I would love to help get it over the v3 milestone.
nivpgir
@nivpgir
hi
I want to use the clap with it's struct opt features

tried adding:

[dependencies]
clap = "~3.0.0-beta.1"

to my Cargo.toml
but sadly:

$ cargo build --release
warning: unused manifest key: target.armv7-unknown-linux-gnueabihf.linker
    Updating crates.io index
error: failed to select a version for the requirement `clap = "~3.0.0"`
  candidate versions found which didn't match: 2.33.0, 2.32.0, 2.31.2, ...
  location searched: crates.io index

this is what I get.
what am I doing wrong?

Denis Lisov
@tanriol
IIUC, no 3.0 preview versions have been published yet.
nivpgir
@nivpgir

so... is it ok that it's in the readme...?
I've found this issue: clap-rs/clap#1589
and in it clap is used like this:

[dependencies]
clap = { git = "https://github.com/clap-rs/clap", features = ["wrap_help"] }

which works...
but how is the readme version supposed to work if no version 3.0 is published?
I'm a rust noob so maybe there's a cargo configuration or something else I'm missing, or maybe it's not supposed to work now? and only on some future version...?

Denis Lisov
@tanriol
The readme seems to be already (partially) updated for the future beta release, but the release has not happened yet.
nivpgir
@nivpgir
OK, I understand, thanks for the patience, I'll just use it from the git for now
Ahmed Abd El Mawgood
@oddcoder
Hello world!
is there a way in clap where I can say
that this argument cannot be used with any other arguments ?
even required ones ?
something like create --help for example (not for help but something different)
Scott Mattan
@rustysys-dev

I got this error:

procyclinsur@P428Scott rediskv]$ cargo run -- -k hello
   Compiling rediskv v0.1.0 (/home/procyclinsur/rust/rediskv)
error[E0599]: no method named `value_of` found for type `std::result::Result<clap::ArgMatches<'_>, clap::Error>` in the current scope
  --> src/main.rs:26:23
   |
26 |     let key = matches.value_of("key").unwrap();
   |                       ^^^^^^^^ method not found in `std::result::Result<clap::ArgMatches<'_>, clap::Error>`

error[E0599]: no method named `value_of` found for type `std::result::Result<clap::ArgMatches<'_>, clap::Error>` in the current scope
  --> src/main.rs:27:25
   |
27 |     let value = matches.value_of("value").unwrap_or("");
   |                         ^^^^^^^^ method not found in `std::result::Result<clap::ArgMatches<'_>, clap::Error>`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0599`.
error: could not compile `rediskv`.

For this code:

extern crate clap;
use clap::{App, Arg, ErrorKind};

fn main() {
    let matches = App::new("rediskv")
        .version("v1.0-beta")
        .author("Scott Mattan <xxxxx@gmail.com>")
        .about("Reads and writes values from redis")
        .arg(Arg::with_name("key")
             .short("k")
             .required(true)
             .value_name("KEY_NAME")
             .help("Redis Key Name")
             .takes_value(true))
        .arg(Arg::with_name("value")
             .short("i")
             .value_name("VALUE")
             .help("Redis Key Value")
             .takes_value(true))
        .get_matches_from_safe(vec![
                               "rediskv"
        ]);

    assert!(matches.is_err());
    assert_eq!(matches.unwrap_err().kind, ErrorKind::MissingRequiredArgument);
    let key = matches.value_of("key").unwrap();
    let value = matches.value_of("value").unwrap_or("");
    println!("Key: {}", key);
    println!("Value: {}", value);
}

When ArgMatches contains the method in question.

Not sure what I am doing wrong, has anyone seen this?

Denis Lisov
@tanriol
The return value of get_matches_from_safe is a Result, which is an enum containing either an ArgMatches struct or an error. You cannot use value_of unless the arguments parse successfully (and you check for that or at least unwrap).
Scott Mattan
@rustysys-dev
@tanriol Thanks for your reply!, I apologize for my delay in responding, you were right, and it I was able to get it working to some extent by treating it as an enum, but thigs didn't work correctly... I think using get_matches_from_safe was incorrect for my current usecase.. I think I should have used get_matches_safe or get_matches.
Scott Mattan
@rustysys-dev

Is there anyway to have subcommands accept args from a parent command so that I do not have to redefine them multiple times?

for example:

let matches = App::new("rediskv")
        .version("v1.0-beta")
        .author("Scott Mattan")
        .about("Reads and writes values from redis")
        .arg(Arg::with_name("key")
             .short("k")
             .value_name("KEY_NAME")
             .required(true)
             .help("Redis Key Name")
             .takes_value(true))
        .arg(Arg::with_name("value")
             .short("i")
             .value_name("VALUE")
             .help("Redis Key Value")
             .takes_value(true))
        .subcommand(SubCommand::with_name("insert") 
                    .about("inserts data into redis")
                    .version("v1.0-beta")
                    .author("Scott Mattan")
                    .args(["key", "value"]))
        .subcommand(SubCommand::with_name("get") 
                    .about("inserts data into redis")
                    .version("v1.0-beta")
                    .author("Scott Mattan")
                    .args(["key"]))
        .get_matches();

Or in this case should I create the Arg::with_name() separately and then just add them.

Denis Lisov
@tanriol
Scott Mattan
@rustysys-dev

@tanriol After looking around, it doesn't seem like there is a required_if subcommand which would be nice since a global arg doesn't seem to be requireable

That being said, thank you!!

Jean Manguy
@jeanmanguy
hi, sorry I am getting started with rust and clap my question might be stupid, how should I proceed if I want to store the the matches of a subcommand in a struct? Different subcommand matches would be stored in different structs, for different use etc. It gets weird with lifetimes, I'm not sure I'm heading on the right direction. Any examples out there ?
Denis Lisov
@tanriol
Have you looked at structopt?
Jean Manguy
@jeanmanguy
I know about it, but I discarded it because I already had clap working before, but maybe it can help
Matthew Pocock
@drdozer
hi - I am using clap 3 beta and the Clap annotation on a struct
I would like to match on the struct, and print out help if some branches of the match are hit -- is there a way to programatically print out the help?
Matthew Pocock
@drdozer
I see .print_help() but I can't see how to call it with my #[derive(Clap)] struct Opts
Denis Lisov
@tanriol
Opts::into_app()?
Matthew Pocock
@drdozer
Ah - I think that's it - I hadn't got the IntoApp trait imported
Matthew Pocock
@drdozer
so I have a sub-crate that isolates my diesel code - it has an autogenerated schema.rs, and a hand-rolled model.rs containing various querieables and insertables.
I have some "business logic" (a phrase I really don't like) that ensures that the raw data objects honour my application requirements e.g. hashed passwords are hashed
does that go into models.rs, or into some separate business logic file? This is really the API that should be used external to the crate
or does it just go direct into lib.rs?