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Better documentation for --("hyphenated-name") longs with clap_app! macro #919

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robotmay opened this issue Mar 28, 2017 · 1 comment
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Better documentation for --("hyphenated-name") longs with clap_app! macro #919

robotmay opened this issue Mar 28, 2017 · 1 comment
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A-docs Area: documentation, including docs.rs, readme, examples, etc... C-enhancement Category: Raise on the bar on expectations

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@robotmay
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robotmay commented Mar 28, 2017 •
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Rust Version

1.15.0

Affected Version of clap

2.22.1

Expected Behavior Summary

Adding options with similar but unique names separated by hyphens should not throw an error.

Actual Behavior Summary

Adding multiple options with similar names, like in the example below, causes numerous issues with duplicate long/short flags.

Sample Code or Link to Sample Code

(@arg power_on_value: -o --power-on-value +takes_value "Value for the pins when power should be on")
(@arg power_off_value: -f --power-off-value +takes_value "Value for the pins when power should be off")

Debug output

Here's the output from the definitions as above:

    Finished debug [unoptimized + debuginfo] target(s) in 2.15 secs
     Running `target/debug/lightship --pins 18 --http http://www.google.com/teapot`
thread 'main' panicked at 'Argument long must be unique

        --power is already in use', /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:125
stack backtrace:
   1:     0x5624e7c9caba - std::sys::imp::backtrace::tracing::imp::write::h3188f035833a2635
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42
   2:     0x5624e7c9f37f - std::panicking::default_hook::{{closure}}::h6385b6959a2dd25b
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:349
   3:     0x5624e7c9ef7e - std::panicking::default_hook::he4f3b61755d7fa95
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:365
   4:     0x5624e7c9f827 - std::panicking::rust_panic_with_hook::hf00b8130f73095ec
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:553
   5:     0x5624e7c9f664 - std::panicking::begin_panic::h6227f62cb2cdaeb4
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:515
   6:     0x5624e7c9f5d9 - std::panicking::begin_panic_fmt::h173eadd80ae64bec
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:499
   7:     0x5624e79f14f3 - clap::app::parser::Parser::debug_asserts::h5e3927975f9767bb
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:125
   8:     0x5624e79f2372 - clap::app::parser::Parser::add_arg::h03b60cbb45075aa5
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:217
   9:     0x5624e78e8844 - clap::app::App::arg::he7712f3aae28dd64
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/mod.rs:709
  10:     0x5624e78f9590 - lightship::main::h9a983c637a63540d
                        at /home/robotmay/Development/piratestudios/lightship/src/main.rs:82
  11:     0x5624e7ca674a - __rust_maybe_catch_panic
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  12:     0x5624e7c9ff66 - std::rt::lang_start::h65647f6e36cffdae
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:434
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panic.rs:351
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/rt.rs:57
  13:     0x5624e78fa692 - main
  14:     0x7fc54017082f - __libc_start_main
  15:     0x5624e78e4758 - _start
  16:                0x0 - <unknown>

Here's the output if you modify the two options to be --poweron-value and --poweroff-value:

    Finished debug [unoptimized + debuginfo] target(s) in 2.20 secs
     Running `target/debug/lightship --pins 18 --http http://www.google.com/teapot`
thread 'main' panicked at 'Argument short must be unique

        -v is already in use', /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:130
stack backtrace:
   1:     0x557b8d9a5a7a - std::sys::imp::backtrace::tracing::imp::write::h3188f035833a2635
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42
   2:     0x557b8d9a833f - std::panicking::default_hook::{{closure}}::h6385b6959a2dd25b
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:349
   3:     0x557b8d9a7f3e - std::panicking::default_hook::he4f3b61755d7fa95
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:365
   4:     0x557b8d9a87e7 - std::panicking::rust_panic_with_hook::hf00b8130f73095ec
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:553
   5:     0x557b8d9a8624 - std::panicking::begin_panic::h6227f62cb2cdaeb4
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:515
   6:     0x557b8d9a8599 - std::panicking::begin_panic_fmt::h173eadd80ae64bec
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:499
   7:     0x557b8d6fa5dc - clap::app::parser::Parser::debug_asserts::h5e3927975f9767bb
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:130
   8:     0x557b8d6fb332 - clap::app::parser::Parser::add_arg::h03b60cbb45075aa5
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/parser.rs:217
   9:     0x557b8d5f1844 - clap::app::App::arg::he7712f3aae28dd64
                        at /home/robotmay/.cargo/registry/src/github.com-1ecc6299db9ec823/clap-2.22.1/src/app/mod.rs:709
  10:     0x557b8d60254a - lightship::main::h9a983c637a63540d
                        at /home/robotmay/Development/piratestudios/lightship/src/main.rs:82
  11:     0x557b8d9af70a - __rust_maybe_catch_panic
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  12:     0x557b8d9a8f26 - std::rt::lang_start::h65647f6e36cffdae
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panicking.rs:434
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/panic.rs:351
                        at /buildslave/rust-buildbot/slave/stable-dist-rustc-linux/build/src/libstd/rt.rs:57
  13:     0x557b8d603652 - main
  14:     0x7f0b5227582f - __libc_start_main
  15:     0x557b8d5ed758 - _start
  16:                0x0 - <unknown>

It compiles fine if you swap them both to poweronvalue and poweroffvalue.

I hope this info helps. I think it's a bug, but I'm not familiar enough with the repo to fix it myself at the moment :)
@kbknapp
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kbknapp commented Mar 28, 2017

This is because to use hyphenated longs with the macro, you must use --("some-hyphenated-name") due to limitations of the Rust macro system.

I'll keep this open as a docs issue though, as that limitation should be clearly articulated.

@kbknapp kbknapp added A-docs Area: documentation, including docs.rs, readme, examples, etc... C: macros C-enhancement Category: Raise on the bar on expectations labels Mar 28, 2017
@kbknapp kbknapp changed the title Issue with similar, but unique, hyphenated options Better documentation for --("hyphenated-name") longs with clap_app! macro Mar 28, 2017
@homu homu closed this as completed in bc08ef3 Apr 5, 2017
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