diff options
author | Matthias Beyer <mail@beyermatthias.de> | 2021-04-24 12:57:12 +0200 |
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committer | Matthias Beyer <mail@beyermatthias.de> | 2021-04-24 13:32:55 +0200 |
commit | d2c13e6f22bb5a116f189c348213e2a45e439df6 (patch) | |
tree | 48b57e5daa8b9c100b59374e5293a44a44231c96 | |
parent | 2987c24a46f3895afd85edd5f3c262776e7fa47e (diff) |
Add support for Option<T>
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
-rw-r--r-- | src/backend/dialoguer.rs | 26 | ||||
-rw-r--r-- | src/backend/mod.rs | 7 | ||||
-rw-r--r-- | src/buildable.rs | 16 | ||||
-rw-r--r-- | src/lib.rs | 7 |
4 files changed, 49 insertions, 7 deletions
diff --git a/src/backend/dialoguer.rs b/src/backend/dialoguer.rs index 11d5349..5bdebd6 100644 --- a/src/backend/dialoguer.rs +++ b/src/backend/dialoguer.rs @@ -1,7 +1,7 @@ use crate::Backend; -use crate::ValueBuilder; use crate::BuildableValue; use crate::CollectionBuilder; +use crate::ValueBuilder; pub struct DialoguerBackend; @@ -88,6 +88,9 @@ impl Backend for DialoguerBackend { Box::new(DialoguerVecBuilder::<T>(std::marker::PhantomData)) } + fn option_builder<T: 'static + BuildableValue>(&self) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = Self::Error>> { + Box::new(DialoguerOptionValueBuilder::<T>(std::marker::PhantomData)) + } } pub struct DialoguerValueBuilder<T: Sized>(std::marker::PhantomData<T>); @@ -106,6 +109,27 @@ impl<T> ValueBuilder for DialoguerValueBuilder<T> } } +pub struct DialoguerOptionValueBuilder<T: BuildableValue>(std::marker::PhantomData<T>); +impl<T: BuildableValue> CollectionBuilder for DialoguerOptionValueBuilder<T> { + type Output = Option<T>; + type Error = DialoguerBackendError; + + fn build_collection(&self, value_desc: &str) -> Result<Self::Output, Self::Error> { + let q = format!("Do you want to provide a Value for {}", value_desc); + let b = dialoguer::Input::<bool>::new() + .with_prompt(q) + .interact_text()?; + + if b { + T::builder(DialoguerBackend) + .build_value(value_desc) + .map(Some) + } else { + Ok(None) + } + } +} + pub struct DialoguerVecBuilder<T: 'static + BuildableValue>(std::marker::PhantomData<T>); impl<T> CollectionBuilder for DialoguerVecBuilder<T> diff --git a/src/backend/mod.rs b/src/backend/mod.rs index 1353a6d..3f72d66 100644 --- a/src/backend/mod.rs +++ b/src/backend/mod.rs @@ -1,8 +1,8 @@ pub mod dialoguer; -use crate::ValueBuilder; use crate::BuildableValue; use crate::CollectionBuilder; +use crate::ValueBuilder; /// A backend can be used to get builders for specific types pub trait Backend { @@ -26,9 +26,10 @@ pub trait Backend { fn char_builder(&self) -> Box<dyn ValueBuilder<Output = char, Error = Self::Error>>; fn string_builder(&self) -> Box<dyn ValueBuilder<Output = String, Error = Self::Error>>; + fn option_builder<T: 'static + BuildableValue>(&self) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = Self::Error>>; + fn vec_builder<T>(&self) -> Box<dyn CollectionBuilder<Output = Vec<T>, Error = Self::Error>> - where T: 'static + BuildableValue - ; + where T: 'static + BuildableValue; } diff --git a/src/buildable.rs b/src/buildable.rs index 95382e7..37bfc3c 100644 --- a/src/buildable.rs +++ b/src/buildable.rs @@ -1,6 +1,6 @@ -use crate::ValueBuilder; -use crate::CollectionBuilder; use crate::Backend; +use crate::CollectionBuilder; +use crate::ValueBuilder; // A value that can be built interactively, using a Backend pub trait BuildableValue: Sized { @@ -164,7 +164,6 @@ impl BuildableValue for String { } - pub trait BuildableCollection { fn builder<E, B>(backend: B) -> Box<dyn CollectionBuilder<Output = Self, Error = E>> where E: Sized, @@ -183,3 +182,14 @@ impl<T> BuildableCollection for Vec<T> } } +impl<T> BuildableCollection for Option<T> + where T: 'static + BuildableValue + Sized +{ + fn builder<E, B>(backend: B) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = E>> + where E: Sized, + B: Backend<Error = E> + { + backend.option_builder() + } +} + @@ -71,6 +71,10 @@ mod dummy_bool_test { unimplemented!() } + fn option_builder<T: 'static + BuildableValue>(&self) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = Self::Error>> { + unimplemented!() + } + fn vec_builder<T>(&self) -> Box<dyn CollectionBuilder<Output = Vec<T>, Error = Self::Error>> where T: 'static + BuildableValue { @@ -155,6 +159,9 @@ mod vec_test { fn string_builder(&self) -> Box<dyn ValueBuilder<Output = String, Error = Self::Error>> { unimplemented!() } + fn option_builder<T: 'static + BuildableValue>(&self) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = Self::Error>> { + unimplemented!() + } fn vec_builder<T>(&self) -> Box<dyn CollectionBuilder<Output = Vec<T>, Error = Self::Error>> where T: 'static + BuildableValue { |