dash-hy 0.1.0

A modern list library for Hy

#+TITLE: dash.hy

A mordern list library for Hy, inspired by Clojure and dash.el.

* dash

Include =dash.dash= and =dash.misc=.

** dash.strtools

str/bytes methods wrapper, such as =s.starts-with?=, =s.concats=,
=s.strip=, etc.

** dash.operator

=hy.pyops= wrapper, such as =o.add=, =o.mul=, =o.sub=, =o.eq?=, etc.

** dash.lodash

Mangled name translation for Python, such as:

- =-map=: =_map=
- =-asssoc!=: =do_assoc=
- =str?=: =is_str=
- =o.eq?=: =o_is_eq=
- =s.starts-with?=: =s_is_starts_with=

* dash.dash

Include =dash.dash.polyfill=, =dash.dash.cons= and =dash.dash.dash=.

** dash.dash.polyfill

Polyfill of Hy/Python, contains lots of simple functions/macros, such
as =identity=, =none?=, =fn?=, =str?=, =inc=, =unless=, =if-let=,
=loop=, etc.

** dash.dash.cons

Implementation of traditional Lisp cons struct and Clojure seq struct.

*** dash.dash.cons.cons

#+begin_src hy
  (cons 1)                   ; (1)
  (cons 1 2)                 ; (1 . 2)
  (cons 1 (cons 2 3))        ; (1 2 . 3)
  (cons 1 (cons 2 (cons 3))) ; (1 2 3)
#+end_src

Emacs Lisp style of =car=, =cdr=, =caar=, =cddr=, =car-safe=,
=cdr-safe=, =setcar=, =setcdr=, etc.

*** dash.dash.cons.seq

#+begin_src hy
  (seq)                 ; _
  (seq [1 2 3])         ; 1 2 3
  (seq (fn [] [1 2 3])) ; 1 2 3
  (lazy-seq [1 2 3])    ; 1 2 3
#+end_src

Clojure style lazy map:

#+begin_src hy
  (defn my-map [f coll]
    (let [s (seq coll)]
      (if (empty? s)
          (seq)
          (lazy-seq
            (cons (f (first s)) (my-map f (rest s)))))))
#+end_src

Python style lazy map:

#+begin_src hy
  (defn my-map [f coll]
    (loop [s (seq coll)]
          (unless (empty? s)
            (yield (f (first s)))
            (recur (rest s)))))
#+end_src

** dash.dash.dash

Main iter/func/coll functions/macros, start with =-= for function and
=--= for corresponding ap macro.

- threading macros: =->=, =->>=, =doto=, etc.
- reduce/map/filter: =-each=, =-dotimes=, =-reduce=, =-map=,
  =-filter=, =-mapcat=, =-any?=, =-all?=, etc.
- iter gen: =-iterate=, =-repeat=, =-repeatedly=, =-cycle=, etc.
- iter mux: =-concat=, =-zip=, =-interleave=, =-interpose=, etc.
- iter part: =-take=, =-drop=, =-last=, =-butlast=, =split=,
  =partition=, etc.
- iter op: =-count=, =-nth=, etc.
- iter misc: =-replace=, =-flatten=, =-group-by=, etc.
- func tools: =-trampoline=, =-partial=, =-notfn=, =-andfn=, =-orfn=,
  =-comp=, =-juxt=, etc.
- item tools: =-assoc=, =-assoc-in=, =-dissoc=, =-dissoc-in=,
  =-update=, =-update-in=, etc.
- dict tools: =-keys=, =-vals=, =-items=, =-merge=, etc.
- set tools: =-union=, =-difference=, =-intersection=, etc.
- coll tools: =-get=, =-get-in=, =empty=, =-into=, =conj=, =disj=,
  =-peek=, =-pop=, etc.


* dash.misc

Misc functions/macros, such as =defmain=, =parse-args=.

** dash.misc.do!

Macro for writing sync and async code parallelly.

#+begin_src hy
  (do/a!
    (defclass (name/a! Stream) []
      (defn/a! read [self]
        (wait/a! ((name/a! real-read))))
      (defn/a! write [self b]
        (wait/a! ((name/a! real-write) b)))))
#+end_src

Expands to:

#+begin_src hy
  (do
    (defclass SyncStream []
      (defn read [self]
        (sync-real-read))
      (defn write [self b]
        (sync-real-write b)))
    (defclass AsyncStream []
      (defn/a read [self]
        (await (async-real-read)))
      (defn/a write [self b]
        (await (async-real-write b)))))
#+end_src

=do/a!= expands all =/a!= forms to corresponding sync/async forms,
such as =(name/a! Stream)= expands to =SyncStream= in sync context and
=AsyncStream= in async context.