Trailing commas in Hlist macros, more doc tests (#44)

* Add support for trailing commas in hlist! and Hlist!

* Support trailing comma pattern matches as well

* Stop ignoring doctests for LabelledGeneric and Generic

* Try tweaking travis.yml

* Core 0.0.10 release

* Derives 0.0.11 release

* 0.1.20 release

* One less kw

Author: lloydmeta

.travis.yml

@@ -15,7 +15,7 @@ script:
   - |
     travis-cargo build &&
     travis-cargo test &&
-    travis-cargo test -- -p frunk_core &&
+    cd core && travis-cargo test &&
     travis-cargo doc
 
 after_success:

Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "frunk"
-version = "0.1.19"
+version = "0.1.20"
 authors = ["Lloyd <lloydmeta@gmail.com>"]
 description = "Frunk provides developers with a number of functional programming tools like HList, Generic, LabelledGeneric, Validated, Monoid, Semigroup and friends."
 license = "MIT"
 documentation = "https://docs.rs/frunk"
 repository = "https://github.com/lloydmeta/frunk"
-keywords = ["Frunk", "HList", "Generic", "Validated", "Semigroup", "Monoid"]
+keywords = ["Frunk", "HList", "Generic", "Validated", "Monoid"]
 
 [badges]
 travis-ci = { repository = "lloydmeta/frunk" }
@@ -16,8 +16,8 @@ time = "0.1.36"
 
 [dependencies.frunk_core]
 path = "core"
-version = "0.0.9"
+version = "0.0.10"
 
 [dependencies.frunk_derives]
 path = "derives"
-version = "0.0.10"
+version = "0.0.11"

core/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "frunk_core"
-version = "0.0.9"
+version = "0.0.10"
 authors = ["Lloyd <lloydmeta@gmail.com>"]
 description = "Frunk core provides developers with HList and Generic"
 license = "MIT"
@@ -10,3 +10,7 @@ keywords = ["Frunk", "HList", "Generic", "LabelledGeneric"]
 
 [badges]
 travis-ci = { repository = "lloydmeta/frunk" }
+
+[dev-dependencies.frunk_derives]
+path = "../derives"
+version = "0.0.11"

core/src/generic.rs

@@ -8,14 +8,15 @@
 /// For the most part, you should be using the derivation that is available through
 /// frunk_derive to generate instances of this typeclass for your types.
 ///
-/// I would highly recommend you check out `derivation_tests.rs` to see how to actually use
-/// this trait in real life. Since frunk_derive depends on this trait, I can't actually
-/// pull it in as a dependency here (otherwise the dependency would be circular) and show
-/// how to use it in a proper doc test.
-///
 /// # Examples
 ///
-/// ```rust,ignore
+/// ```rust
+/// #[allow(unused_imports)]
+/// # #[macro_use] extern crate frunk_derives;
+/// # #[macro_use] extern crate frunk_core;
+/// # use frunk_core::hlist::*; fn main() {
+/// use frunk_core::hlist::*;
+/// use frunk_core::generic::*;
 /// #[derive(Generic)]
 /// struct ApiPerson<'a> {
 ///     FirstName: &'a str,
@@ -31,11 +32,12 @@
 /// }
 ///
 /// let a_person = ApiPerson {
-///     first_name: "Joe",
-///     last_name: "Blow",
-///     age: 30,
+///     FirstName: "Joe",
+///     LastName: "Blow",
+///     Age: 30,
 /// };
 /// let d_person: DomainPerson = convert_from(a_person); // done
+/// # }
 /// ```
 pub trait Generic {
     /// The generic representation type

core/src/hlist.rs

@@ -175,7 +175,13 @@ pub fn h_cons<H, T: HList>(h: H, tail: T) -> HCons<H, T> {
 /// let (h1, (h2, h3)) = h.into_tuple2();
 /// assert_eq!(h1, 13.5f32);
 /// assert_eq!(h2, "hello");
-/// assert_eq!(h3, Some(41))
+/// assert_eq!(h3, Some(41));
+///
+/// // Also works when you have trailing commas
+/// let h4 = hlist!["yo",];
+/// let h5 = hlist![13.5f32, "hello", Some(41),];
+/// assert_eq!(h4, hlist!["yo"]);
+/// assert_eq!(h5, hlist![13.5f32, "hello", Some(41)]);
 /// # }
 /// ```
 #[macro_export]
@@ -193,6 +199,16 @@ macro_rules! hlist {
         $crate::hlist::HCons { head: $first, tail: hlist!($($repeated), *)}
     };
 
+    // <-- Forwarding of trailing comma variants
+    ($first: expr, $( $repeated: expr, ) +) => {
+        hlist!($first, $($repeated),*)
+    };
+
+    ($first: expr, ) => {
+        hlist!($first)
+    };
+    // Forwarding of trailing comma variants -->
+
 }
 
 /// Macro for pattern-matching on HLists.
@@ -207,14 +223,19 @@ macro_rules! hlist {
 /// let hlist_pat![h1, h2, h3] = h;
 /// assert_eq!(h1, 13.5f32);
 /// assert_eq!(h2, "hello");
-/// assert_eq!(h3, Some(41))
+/// assert_eq!(h3, Some(41));
 /// # }
 /// ```
 #[macro_export]
 macro_rules! hlist_pat {
     {} => { $crate::hlist::HNil };
     { $head:pat, $($tail:tt), +} => { $crate::hlist::HCons{ head: $head, tail: hlist_pat!($($tail),*) } };
     { $head:pat } => { $crate::hlist::HCons { head: $head, tail: $crate::hlist::HNil } };
+
+    // <-- Forward trailing comma variants
+    { $head:pat, $($tail:tt,) +} => { hlist_pat!($head, $($tail),*) };
+    { $head:pat, } => { hlist_pat!($head) };
+    // Forward trailing comma variants -->
 }
 
 /// Returns a type signature for an HList of the provided types
@@ -242,6 +263,16 @@ macro_rules! Hlist {
     ($first: ty, $( $repeated: ty ), +) => {
         $crate::hlist::HCons<$first, Hlist!($($repeated), *)>
     };
+
+    // <-- Forward trailing comma variants
+    ($single: ty,) => {
+        Hlist![$single]
+    };
+
+    ($first: ty, $( $repeated: ty, ) +) => {
+        Hlist![$first, $($repeated),*]
+    };
+    // Forward trailing comma variants -->
 }
 
 impl<RHS> Add<RHS> for HNil
@@ -407,12 +438,11 @@ impl<Source> Sculptor<HNil, HNil> for Source {
 /// Indices is HCons<IndexHead, IndexTail> here because the compiler is being asked to figure out the
 /// Index for Plucking the first item of type THead out of Self and the rest (IndexTail) is for the
 /// Plucker's remainder induce.
-impl <THead, TTail, SHead, STail, IndexHead, IndexTail> Sculptor<HCons<THead, TTail>, HCons<IndexHead, IndexTail>>
-    for HCons<SHead, STail>
+impl<THead, TTail, SHead, STail, IndexHead, IndexTail> Sculptor<HCons<THead, TTail>, HCons<IndexHead, IndexTail>>
+for HCons<SHead, STail>
     where
         HCons<SHead, STail>: Plucker<THead, IndexHead>,
         <HCons<SHead, STail> as Plucker<THead, IndexHead>>::Remainder: Sculptor<TTail, IndexTail> {
-
     type Remainder = <<HCons<SHead, STail> as Plucker<THead, IndexHead>>::Remainder as Sculptor<TTail, IndexTail>>::Remainder;
 
     fn sculpt(self) -> (HCons<THead, TTail>, Self::Remainder) {
@@ -426,7 +456,6 @@ impl <THead, TTail, SHead, STail, IndexHead, IndexTail> Sculptor<HCons<THead, TT
             tail_remainder
         )
     }
-
 }
 
 
@@ -468,10 +497,10 @@ impl<H, Tail> IntoReverse for HCons<H, Tail>
 
     fn into_reverse(self) -> Self::Output {
         self.tail.into_reverse() +
-        HCons {
-            head: self.head,
-            tail: HNil,
-        }
+            HCons {
+                head: self.head,
+                tail: HNil,
+            }
     }
 }
 
@@ -624,7 +653,7 @@ impl<F, Acc> HFoldLeftable<F, Acc> for HNil {
 }
 
 impl<F, FolderHeadR, FolderTail, H, Tail, Acc> HFoldLeftable<HCons<F, FolderTail>, Acc>
-    for HCons<H, Tail>
+for HCons<H, Tail>
     where Tail: HFoldLeftable<FolderTail, FolderHeadR>,
           F: FnOnce(Acc, H) -> FolderHeadR
 {
@@ -714,16 +743,14 @@ mod tests {
 
     #[test]
     fn test_pluck() {
-
         let h = hlist![1, "hello", true, 42f32];
         let (t, r): (f32, _) = h.pluck();
         assert_eq!(t, 42f32);
         assert_eq!(r, hlist![1, "hello", true])
-
     }
 
     #[test]
-    fn test_macro() {
+    fn test_hlist_macro() {
         assert_eq!(hlist![], HNil);
         let h: Hlist
         !(i32, &str, i32) = hlist![1, "2", 3];
@@ -738,14 +765,37 @@ mod tests {
         assert_eq!(tail3, HNil);
     }
 
+
+    #[test]
+    #[allow(non_snake_case)]
+    fn test_Hlist_macro() {
+        let h1: Hlist!(i32, &str, i32) = hlist![1, "2", 3];
+        let h2: Hlist!(i32, &str, i32,) = hlist![1, "2", 3];
+        let h3: Hlist!(i32) = hlist![1];
+        let h4: Hlist!(i32,) = hlist![1,];
+        assert_eq!(h1, h2);
+        assert_eq!(h3, h4);
+    }
+
     #[test]
     fn test_pattern_matching() {
+        let hlist_pat!(one1) = hlist!["one"];
+        assert_eq!(one1, "one");
+        let hlist_pat!(one2,) = hlist!["one"];
+        assert_eq!(one2, "one");
+
         let h = hlist![5, 3.2f32, true, "blue".to_owned()];
         let hlist_pat!(five, float, right, s) = h;
         assert_eq!(five, 5);
         assert_eq!(float, 3.2f32);
         assert_eq!(right, true);
         assert_eq!(s, "blue".to_owned());
+
+        let h2 = hlist![13.5f32, "hello", Some(41)];
+        let hlist_pat![a, b, c,] = h2;
+        assert_eq!(a, 13.5f32);
+        assert_eq!(b, "hello");
+        assert_eq!(c, Some(41));
     }
 
     #[test]
@@ -793,11 +843,9 @@ mod tests {
 
     #[test]
     fn test_sculpt() {
-
         let h = hlist![9000, "joe", 41f32];
         let (reshaped, remainder): (Hlist!(f32, i32), _) = h.sculpt();
         assert_eq!(reshaped, hlist![41f32, 9000]);
         assert_eq!(remainder, hlist!["joe"])
-
     }
 }

core/src/labelled.rs

@@ -30,29 +30,34 @@ use std::fmt;
 
 /// A trait that converts from a type to a labelled generic representation
 ///
+/// LabelledGenerics allow us to have completely type-safe, boilerplate free conversions
+/// between different structs.
+///
 /// For the most part, you should be using the derivation that is available through
 /// frunk_derive to generate instances of this typeclass for your types.
 ///
-/// I would highly recommend you check out `derivation_tests.rs` to see how to actually use
-/// this trait in real life. Since frunk_derive depends on this trait, I can't actually
-/// pull it in as a dependency here (otherwise the dependency would be circular) and show
-/// how to use it in a proper doc test.
-///
 /// # Examples
 ///
-/// ```rust,ignore
+/// ```rust
+/// #[allow(unused_imports)]
+/// # #[macro_use] extern crate frunk_derives;
+/// # #[macro_use] extern crate frunk_core;
+/// # use frunk_core::hlist::*; fn main() {
+/// use frunk_core::hlist::*;
+/// use frunk_core::labelled::*;
 /// #[derive(LabelledGeneric)]
 /// struct NewUser<'a> {
 ///     first_name: &'a str,
 ///     last_name: &'a str,
 ///     age: usize,
 /// }
 ///
+/// // Notice that the fields are mismatched in terms of ordering
 /// #[derive(LabelledGeneric)]
 /// struct SavedUser<'a> {
-///     first_name: &'a str,
 ///     last_name: &'a str,
 ///     age: usize,
+///     first_name: &'a str,
 /// }
 ///
 /// let n_user = NewUser {
@@ -61,8 +66,10 @@ use std::fmt;
 ///     age: 30,
 /// };
 ///
-/// let s_user = <SavedUser as LabelledGeneric>::sculpted_convert_from(n_user); // done
-/// ```
+/// // sculpted_convert_from automagically sculpts the labelled generic
+/// // representation of the source object to that of the target type
+/// let s_user: SavedUser = sculpted_convert_from(n_user); // done
+/// # }
 pub trait LabelledGeneric {
     /// The labelled generic representation type
     type Repr;

derives/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "frunk_derives"
-version = "0.0.10"
+version = "0.0.11"
 authors = ["Lloyd <lloydmeta@gmail.com>"]
 description = "frunk_derives contains the custom derivations for certain traits in Frunk."
 license = "MIT"
@@ -20,4 +20,4 @@ quote = "0.3.15"
 
 [dependencies.frunk_core]
 path = "../core"
-version = "0.0.9"
+version = "0.0.10"

derives/src/lib.rs

@@ -8,7 +8,6 @@
 //!   2. [Crates.io page](https://crates.io/crates/frunk)
 
 extern crate proc_macro;
-#[macro_use]
 extern crate frunk_core;
 #[macro_use]
 extern crate quote;

src/lib.rs

@@ -101,8 +101,10 @@
 //!   1. [Source on Github](https://github.com/lloydmeta/frunk)
 //!   2. [Crates.io page](https://crates.io/crates/frunk)
 
+#[allow(unused_imports)]
 #[macro_use]
 extern crate frunk_core;
+#[allow(unused_imports)]
 #[macro_use]
 extern crate frunk_derives;
 

tests/validated_tests.rs

@@ -1,5 +1,4 @@
 extern crate frunk;
-#[macro_use] // for the hlist macro
 extern crate frunk_core;
 
 use frunk::*; // for the Generic trait and HList