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Defaults fail to load #182

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Jengamon opened this issue Apr 25, 2016 · 7 comments
Open

Defaults fail to load #182

Jengamon opened this issue Apr 25, 2016 · 7 comments

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@Jengamon
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I have this usage string here, nearly verbatim:

Validates and packages a ***** project folder.

Usage:
    *******-packer <folder> [--output=FILE]
    *******-packer (--help | --version)
Options:
    --help          # Display this help message.
    --version       # Displays the program version.
    --output=<file> # Specifies a output name [default: game.grav].

Whenever I run it using this struct:

#[derive(RustcDecodable)]
struct Args {
    arg_folder: Option<String>,
    flag_output: String,
    flag_help: bool,
    flag_version: bool
}

and I use the command line: *******-packer game, it gives me "" for flag_output, even though I specified a default. Is there anything I'm doing wrong?
@BurntSushi
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Could you please provide source code that I can compile and run? I can't reproduce your problem.

My src/main.rs:

extern crate docopt;
extern crate rustc_serialize;

use docopt::Docopt;

const USAGE: &'static str = "
Usage:
    prog <folder> [--output=FILE]
    prog (--help | --version)
Options:
    --help           # Display this help message.
    --version        # Displays the program version.
    --output=<file>  # Specifies a output name [default: game.grav].
";

#[derive(Debug, RustcDecodable)]
struct Args {
    arg_folder: Option<String>,
    flag_output: String,
    flag_help: bool,
    flag_version: bool,
}

fn main() {
    let args: Args = Docopt::new(USAGE).and_then(|d| d.decode())
                                       .unwrap_or_else(|e| e.exit());
    println!("{:?}", args);
}

My Cargo.toml:

[package]
name = "docopt-182"
version = "0.1.0"
authors = ["Andrew Gallant <[email protected]>"]

[dependencies]
docopt = "0.6"
rustc-serialize = "0.3"

And running it:

$ cargo build
$ ./target/debug/docopt-182 game
Args { arg_folder: Some("game"), flag_output: "game.grav", flag_help: false, flag_version: false }

Which shows that flag_output gets the correct default value of "game.grav".

@Jengamon
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Jengamon commented Apr 25, 2016 •
edited
Loading

My main.rs:

extern crate tar;
extern crate bzip2;
extern crate base64;
extern crate docopt;
extern crate rustc_serialize;

const USAGE: &'static str = "
Validates and packages a Gravity project folder.

Usage:
    gravity-packer <folder> [--output=FILE]
    gravity-packer (--help | --version)
Options:
    --help          # Display this help message.
    --version       # Displays the program version.
    --output=FILE   # Specifies a output name [default: game.grav].
";

#[derive(Debug, RustcDecodable)]
struct Args {
    arg_folder: Option<String>,
    flag_output: String,
    flag_help: bool,
    flag_version: bool
}

use docopt::Docopt;

fn main() {
    let args: Args = Docopt::new(USAGE)
                            .and_then(|d| d.decode())
                            .unwrap_or_else(|e| e.exit());
    println!("{:?}", args);
    if args.arg_folder.is_some() {
        // Read folder w/ output
        println!("Output to {}?", args.flag_output);
    } else if args.flag_help {
        println!("{}", USAGE)
    } else if args.flag_version {
        println!("Version {}", option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"))
    }
}

My Cargo.toml:

[package]
name = "gravity-packer"
version = "0.1.0"
authors = ["Bobhostern <[email protected]>"]

[dependencies]
base64 = "0.1"
bzip2 = "0.3"
tar = "0.4"
docopt = "0.6"
rustc-serialize = "0.3"
walkdir = "0.1"

When I run the program with cargo run -- game, I get:

Compiling gravity-packer v0.1.0 (file:///C:/Users/Bobho_000/Documents/Rust/gravity/packer)
     Running `target\debug\gravity-packer.exe game`
Args { arg_folder: Some("game"), flag_output: "", flag_help: false, flag_version: false }
Output to ?

Using windows cmd.exe, and even your example produces no flag_output. 😖 I dunno what's going on.

@BurntSushi
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@Bobhostern Can you show your Cargo.lock file?

@Jengamon
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Cargo.lock:

[root]
name = "gravity-packer"
version = "0.1.0"
dependencies = [
 "base64 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "bzip2 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "docopt 0.6.80 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 "tar 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "walkdir 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "aho-corasick"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "base64"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "bzip2"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "bzip2-sys 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "bzip2-sys"
version = "0.1.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "gcc 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "docopt"
version = "0.6.80"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "regex 0.1.68 (registry+https://github.com/rust-lang/crates.io-index)",
 "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
 "strsim 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "filetime"
version = "0.1.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "gcc"
version = "0.3.27"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "kernel32-sys"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "libc"
version = "0.2.10"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "memchr"
version = "0.1.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "regex"
version = "0.1.68"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "aho-corasick 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "regex-syntax 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "thread_local 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 "utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "regex-syntax"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "rustc-serialize"
version = "0.3.19"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "strsim"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "tar"
version = "0.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "thread-id"
version = "2.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "thread_local"
version = "0.2.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "utf8-ranges"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "walkdir"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
 "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
]

[[package]]
name = "winapi"
version = "0.2.6"
source = "registry+https://github.com/rust-lang/crates.io-index"

[[package]]
name = "winapi-build"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"

@BurntSushi
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Member

I'm unfortunately not sure. If you're still getting the problem even with my code, then maybe there is a Windows bug lurking somewhere? I'll investigate eventually, but it might be a bit. Sorry. :-(

@nixpulvis
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Contributor

FWIW, I can also seem to replicate this with the following (taken from @BurntSushi's example):

extern crate docopt;

use docopt::Docopt;

const USAGE: &'static str = "
Usage:
    prog <folder> [--output=FILE]
    prog (--help | --version)
Options:
    --help           # Display this help message.
    --version        # Displays the program version.
    --output=<file>  # Specifies a output name [default: game.grav].
";

fn main() {
    let args = Docopt::new(USAGE).and_then(|d| d.parse())
                           .unwrap_or_else(|e| e.exit());
    println!("{:?}", args);
}

@theronic
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Can corroborate that defaults are not loading for an ARMv6 Raspbian build.

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4 participants
@BurntSushi @nixpulvis @theronic @Jengamon