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-# Cljlib-macros.fnl
-Macro module for Fennel Cljlib.
-
-## Metadata macros
-Metadata in Fennel is a pretty tough subject, as there's no such thing as metadata in Lua.
-Therefore, the metadata usage in Fennel is more limited compared to Clojure.
-This library provides some facilities for metadata management, which are experimental and should be used with care.
-
-There are several important gotchas about using metadata.
-
-First, note that this works only when used with Fennel, and only when `(require fennel)` works.
-For compiled Lua library this feature is turned off.
-
-Second, try to avoid using metadata with anything else than tables and functions.
-When storing function or table as a key into metatable, its address is used, while when storing string of number, the value is used.
-This, for example, may cause documentation collision, when you've set some variable holding a number value to have certain docstring, and later you've defined another variable with the same value, but different docstring.
-While this isn't a major breakage, it may confuse if someone will explore your code in the REPL with `doc`.
-
-Lastly, note that prior to Fennel 0.7.1 `import-macros` wasn't respecting `--metadata` switch.
-So if you're using Fennel < 0.7.1 this stuff will only work if you use `require-macros` instead of `import-macros`.
-
-
-### `when-meta`
-This macros is a wrapper that compiles away if metadata support was not enabled.
-What this effectively means, is that everything that is wrapped with this macro will disappear from the resulting Lua code if metadata is not enabled when compiling with `fennel --compile`.
-
-
-### `with-meta`
-Attach metadata to a value.
-
-    >> (local foo (with-meta (fn [...] (let [[x y z] [...]] (+ x y z)))
-                             {:fnl/arglist [:x :y :z :...]
-                              :fnl/docstring "sum first three values"}))
-    >> (doc foo)
-    (foo x y z ...)
-      sum first three values
-
-When metadata feature is not enabled, returns the value without additional metadata.
-
-
-### `meta`
-Get metadata table from object:
-
-    >> (meta (with-meta {} {:meta "data"}))
-    {
-        :meta "data"
-    }
-
-
-## `def` and `defonce`
-`def` is wrappers around `local` which can declare variables inside namespace, and as local at the same time:
-
-    >> (def ns {})
-    >> (def a 10)
-    >> a
-    10
-    >> (def ns.a 20)
-    >> a
-    20
-    >> ns.a
-    20
-
-Both `ns.a` and `a` refer to the same value.
-
-`defonce` ensures that the binding isn't overridden by another `defonce`:
-
-    >> (defonce ns {})
-    >> (defonce ns.a 42)
-    >> (defonce ns 10)
-    >> ns
-    {:a 42}
-    >> a
-    42
-
-Both `def` and `defonce` support literal metadata table as first argument, or a :dynamic keyword, that uses Fennel `var` instead of `local`:
-
-    >> (def {:dynamic true} a 10)
-    >> (set a 20)
-    >> a
-    20
-    >> (defonce :dynamic b 40)
-    >> (set b 42)
-    >> b
-    42
-
-Documentation string can be attached to value via `:doc` keyword.
-However it is not recommended to attach metadata to everything except tables and functions:
-
-    ;; Bad, may overlap with existing documentation for 299792458, if any
-    >> (def {:doc "The speed of light in m/s"} c 299792458)
-    >> (doc c)
-    c
-      The speed of light in m/s
-
-    ;; OK
-    >> (def {:doc "default connection options"}
-            defaults {:port 1234
-                      :host localhost})
-
-
-## `fn*`
-Clojure's `fn` equivalent.
-Returns a function of fixed amount of arguments by doing runtime dispatch based on argument count.
-Capable of producing multi-arity functions:
-
-    (fn* square "square number" [x] (^ x 2))
-
-    (square 9) ;; => 81.0
-    (square 1 2) ;; => error
-
-    (fn* range
-      "Returns increasing sequence  of numbers from `lower' to `upper'.
-    If `lower' is not provided, sequence starts from zero.
-    Accepts optional `step'"
-      ([upper] (range 0 upper 1))
-      ([lower upper] (range lower upper 1))
-      ([lower upper step]
-       (let [res []]
-         (for [i lower (- upper step) step]
-           (table.insert res i))
-         res)))
-
-    (range 10) ;; => [0 1 2 3 4 5 6 7 8 9]
-    (range -10 0) ;; => [-10 -9 -8 -7 -6 -5 -4 -3 -2 -1]
-    (range 0 1 0.2) ;; => [0.0 0.2 0.4 0.6 0.8]
-
-Both variants support up to one arity with `& more`:
-
-    (fn* vec [& xs] xs)
-
-    (vec 1 2 3) ;; => [1 2 3]
-
-    (fn* add
-      "sum two or more values"
-      ([] 0)
-      ([a] a)
-      ([a b] (+ a b))
-      ([a b & more] (add (+ a b) (unpack more))))
-
-    (add) ;; => 0
-    (add 1) ;; => 1
-    (add 1 2) ;; => 3
-    (add 1 2 3 4) ;; => 10
-
-One extra capability of `fn*` supports the same semantic as `def` regarding namespaces:
-
-    (local ns {})
-
-    (fn* ns.plus
-      ([] 0)
-      ([x] x)
-      ([x y] (+ x y))
-      ([x y & zs] (apply plus (+ x y) zs)))
-
-    ns
-
-Note, that `plus` is used without `ns` part, e.g. not `ns.plus`.
-If we `require` this code from file in the REPL, we will see that our `ns` has single function `plus`:
-
-    >> (local ns (require :module))
-    >> ns
-    {add #<function 0xbada55code>}
-
-This is possible because `fn*` separates the namespace part from the function name, and creates a `local` variable with the same name as function, then defines the function within lexical scope of `do`, sets `namespace.foo` to it and returns the function object to the outer scope.
-
-    (local plus
-           (do (fn plus [...]
-                 ;; plus body
-                 )
-               (set ns.plus plus)
-               plus))
-
-See `core.fnl` for more examples.
-
-
-## `fn+`
-Works similarly to Fennel's `fn`, by creating ordinary function without arity semantics, except does the namespace automation like `fn*`, and has the same order of arguments as the latter:
-
-    (local ns {})
-
-    ;; module & file-local functions
-    (fn+ ns.double
-      "double the number"
-      [x]
-      (* x 2))
-
-    (fn+ ns.triple
-      [x]
-      (* x 3))
-
-    ;; no namespace, file-local function
-    (fn+ quadruple
-      [x]
-      (* x 4))
-
-    ;; anonymous file-local function
-    (fn+ [x] (* x 5))
-
-    ns
-
-See `core.fnl` for more examples.
-
-
-## `if-let` and `when-let`
-When test expression is not `nil` or `false`, evaluates the first body form with the `name` bound to the result of the expressions.
-
-    (if-let [val (test)]
-      (print val)
-      :fail)
-
-Expanded form:
-
-    (let [tmp (test)]
-      (if tmp
-          (let [val tmp]
-            (print val))
-          :fail))
-
-`when-let` is mostly the same, except doesn't have false branch and accepts any amount of forms:
-
-    (when-let [val (test)]
-      (print val)
-      val)
-
-Expanded form:
-
-    (let [tmp (test)]
-      (if tmp
-          (let [val tmp]
-            (print val)
-            val)))
-
-
-## `if-some` and `when-some`
-Much like `if-let` and `when-let`, except tests expression for not being `nil`.
-
-    (when-some [val (foo)]
-      (print (.. "val is not nil: " val))
-      val)
-
-
-## `into`
-Clojure's `into` function is implemented as macro, because Fennel has no runtime distinction between `[]` and `{}` tables, since Lua also doesn't feature this feature.
-However we can do this at compile time.
-
-    (into [1 2 3] [4 5 6]) ;; => [1 2 3 4 5 6]
-    (into [] {:a 1 :b 2 :c 3 :d 4}) ;; => [["d" 4] ["a" 1] ["b" 2] ["c" 3]]
-    (into {} [[:d 4] [:a 1] [:b 2] [:c 3]]) ;; => {:a 1 :b 2 :c 3 :d 4}
-    (into {:a 0 :e 5} {:a 1 :b 2 :c 3 :d 4}) ;; => {:a 1 :b 2 :c 3 :d 4 :e 5}
-
-Because the type check at compile time it will only respect the type when literal representation is used.
-If a variable holding the table, its type is checked at runtime.
-Empty tables default to sequential ones:
-
-    (local a [])
-    (into a {:a 1 :b 2}) ;; => [["b" 2] ["a" 1]]
-
-    (local b {})
-    (into b {:a 1 :b 2}) ;; => [["b" 2] ["a" 1]]
-
-However, if target table is not empty, its type can be deduced:
-
-    (local a {:c 3})
-    (into a {:a 1 :b 2}) ;; => {:a 1 :b 2 :c 3}
-
-    (local b [1])
-    (into b {:a 1 :b 2}) ;; => [1 ["b" 2] ["a" 1]]
-
-Note that when converting associative table into sequential table order is determined by the `pairs` function.
-Also note that if variable stores the table has both integer key 1, and other associative keys, the type will be the same as of sequential table.
-
-
-## `defmulti` and `defmethod`
-A bit more simple implementations of Clojure's `defmulti` and `defmethod`.
-`defmulti` macros returns an empty table with `__call` metamethod, that calls dispatching function on its arguments.
-Methods are defined inside `multimethods` table, which is also stored in the metatable.
-
-`defmethod` adds a new method to the metatable of given `multifn`.
-It accepts the multi-fn table as its first argument, the dispatch value as second, and Fennel's arglist followed by the body:
-
-    (defmulti fac (fn [x] x))
-
-    (defmethod fac 0 [_] 1)
-    (defmethod fac :default [x] (* x (fac (- x 1))))
-
-    (fac 4) ;; => 24
-
-`:default` is a special method which gets called when no other methods were found for given dispatch value.