mirror of
https://github.com/clap-rs/clap
synced 2025-01-22 17:34:59 +00:00
7f08773a5a
Before, partial command lines would panic at runtime. Now it'll be a
compile error
For example:
```
pub enum Opt {
Daemon(DaemonCommand),
}
pub enum DaemonCommand {
Start,
Stop,
}
```
Gives:
```
error[E0277]: the trait bound `DaemonCommand: clap::Args` is not satisfied
--> clap_derive/tests/subcommands.rs:297:16
|
297 | Daemon(DaemonCommand),
| ^^^^^^^^^^^^^ the trait `clap::Args` is not implemented for `DaemonCommand`
|
= note: required by `augment_args`
```
To nest this, you currently need `enum -> struct -> enum`. A later
change will make it so you can use the `subcommand` attribute within
enums to cover this case.
This is a part of #2005
82 lines
2.2 KiB
Rust
82 lines
2.2 KiB
Rust
//! Dummy implementations that we emit along with an error.
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use proc_macro2::Ident;
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use proc_macro_error::append_dummy;
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use quote::quote;
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pub fn clap_struct(name: &Ident) {
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into_app(name);
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args(name);
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append_dummy(quote!( impl clap::Clap for #name {} ));
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}
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pub fn clap_enum(name: &Ident) {
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into_app(name);
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subcommand(name);
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append_dummy(quote!( impl clap::Clap for #name {} ));
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}
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pub fn into_app(name: &Ident) {
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append_dummy(quote! {
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impl clap::IntoApp for #name {
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fn into_app<'b>() -> clap::App<'b> {
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unimplemented!()
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}
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fn into_app_for_update<'b>() -> clap::App<'b> {
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unimplemented!()
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}
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}
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});
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}
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pub fn from_arg_matches(name: &Ident) {
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append_dummy(quote! {
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impl clap::FromArgMatches for #name {
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fn from_arg_matches(_m: &clap::ArgMatches) -> Option<Self> {
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unimplemented!()
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}
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fn update_from_arg_matches(&mut self, matches: &clap::ArgMatches) {
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unimplemented!()
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}
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}
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});
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}
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pub fn subcommand(name: &Ident) {
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from_arg_matches(name);
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append_dummy(quote! {
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impl clap::Subcommand for #name {
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fn augment_subcommands(_app: clap::App<'_>) -> clap::App<'_> {
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unimplemented!()
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}
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fn augment_subcommands_for_update(_app: clap::App<'_>) -> clap::App<'_> {
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unimplemented!()
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}
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}
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});
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}
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pub fn args(name: &Ident) {
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from_arg_matches(name);
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append_dummy(quote! {
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impl clap::Args for #name {
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fn augment_args(_app: clap::App<'_>) -> clap::App<'_> {
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unimplemented!()
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}
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fn augment_args_for_update(_app: clap::App<'_>) -> clap::App<'_> {
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unimplemented!()
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}
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}
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});
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}
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pub fn arg_enum(name: &Ident) {
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append_dummy(quote! {
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impl clap::ArgEnum for #name {
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const VARIANTS: &'static [&'static str] = &[];
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fn from_str(_input: &str, _case_insensitive: bool) -> Result<Self, String> {
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unimplemented!()
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}
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}
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})
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}
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