Version 2.3.0

Pacify Luacheck.

.gitignore

@@ -1,3 +0,0 @@
-__*
-*.tmp
-*.swp

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2015, rxi
+Copyright (c) 2017 rxi
 
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of

README.md

@@ -15,10 +15,10 @@ lume = require "lume"
 
 ## Function Reference
 
-### lume.clamp(x, min, max)
+#### lume.clamp(x, min, max)
 Returns the number `x` clamped between the numbers `min` and `max`
 
-### lume.round(x [, increment])
+#### lume.round(x [, increment])
 Rounds `x` to the nearest integer; rounds away from zero if we're midway
 between two integers. If `increment` is set then the number is rounded to the
 nearest increment.
@@ -27,44 +27,50 @@ lume.round(2.3) -- Returns 2
 lume.round(123.4567, .1) -- Returns 123.5
 ```
 
-### lume.sign(x)
+#### lume.sign(x)
 Returns `1` if `x` is 0 or above, returns `-1` when `x` is negative.
 
-### lume.lerp(a, b, amount)
+#### lume.lerp(a, b, amount)
 Returns the linearly interpolated number between `a` and `b`, `amount` should
 be in the range of 0 - 1; if `amount` is outside of this range it is clamped.
 ```lua
 lume.lerp(100, 200, .5) -- Returns 150
 ```
 
-### lume.smooth(a, b, amount)
+#### lume.smooth(a, b, amount)
 Similar to `lume.lerp()` but uses cubic interpolation instead of linear
 interpolation.
 
-### lume.pingpong(x)
+#### lume.pingpong(x)
 Ping-pongs the number `x` between 0 and 1.
 
-### lume.distance(x1, y1, x2, y2 [, squared])
+#### lume.distance(x1, y1, x2, y2 [, squared])
 Returns the distance between the two points. If `squared` is true then the
 squared distance is returned -- this is faster to calculate and can still be
 used when comparing distances.
 
-### lume.angle(x1, y1, x2, y2)
+#### lume.angle(x1, y1, x2, y2)
 Returns the angle between the two points.
 
-### lume.random([a [, b]])
+#### lume.vector(angle, magnitude)
+Given an `angle` and `magnitude`, returns a vector.
+```lua
+local x, y = lume.vector(0, 10) -- Returns 10, 0
+```
+
+#### lume.random([a [, b]])
 Returns a random number between `a` and `b`. If only `a` is supplied a number
 between `0` and `a` is returned. If no arguments are supplied a random number
 between `0` and `1` is returned.
 
-### lume.randomchoice(t)
+#### lume.randomchoice(t)
 Returns a random value from array `t`. If the array is empty an error is
 raised.
 ```lua
 lume.randomchoice({true, false}) -- Returns either true or false
 ```
 
-### lume.weightedchoice(t)
+#### lume.weightedchoice(t)
 Takes the argument table `t` where the keys are the possible choices and the
 value is the choice's weight. A weight should be 0 or above, the larger the
 number the higher the probability of that choice being picked. If the table is
@@ -74,7 +80,14 @@ lume.weightedchoice({ ["cat"] = 10, ["dog"] = 5, ["frog"] = 0 })
 -- Returns either "cat" or "dog" with "cat" being twice as likely to be chosen.
 ```
 
-### lume.push(t, ...)
+#### lume.isarray(x)
+Returns `true` if `x` is an array -- the value is assumed to be an array if it
+is a table which contains a value at the index `1`. This function is used
+internally and can be overridden if you wish to use a different method to detect
+arrays.
+
+
+#### lume.push(t, ...)
 Pushes all the given values to the end of the table `t` and returns the pushed
 values. Nil values are ignored.
 ```lua
@@ -82,7 +95,7 @@ local t = { 1, 2, 3 }
 lume.push(t, 4, 5) -- `t` becomes { 1, 2, 3, 4, 5 }
 ```
 
-### lume.remove(t, x)
+#### lume.remove(t, x)
 Removes the first instance of the value `x` if it exists in the table `t`.
 Returns `x`.
 ```lua
@@ -90,7 +103,7 @@ local t = { 1, 2, 3 }
 lume.remove(t, 2) -- `t` becomes { 1, 3 }
 ```
 
-### lume.clear(t)
+#### lume.clear(t)
 Nils all the values in the table `t`, this renders the table empty. Returns
 `t`.
 ```lua
@@ -98,7 +111,7 @@ local t = { 1, 2, 3 }
 lume.clear(t) -- `t` becomes {}
 ```
 
-### lume.extend(t, ...)
+#### lume.extend(t, ...)
 Copies all the fields from the source tables to the table `t` and returns `t`.
 If a key exists in multiple tables the right-most table's value is used.
 ```lua
@@ -106,10 +119,10 @@ local t = { a = 1, b = 2 }
 lume.extend(t, { b = 4, c = 6 }) -- `t` becomes { a = 1, b = 4, c = 6 }
 ```
 
-### lume.shuffle(t)
+#### lume.shuffle(t)
 Returns a shuffled copy of the array `t`.
 
-### lume.sort(t [, comp])
+#### lume.sort(t [, comp])
 Returns a copy of the array `t` with all its items sorted. If `comp` is a
 function it will be used to compare the items when sorting. If `comp` is a
 string it will be used as the key to sort the items by.
@@ -119,13 +132,13 @@ lume.sort({ {z=2}, {z=3}, {z=1} }, "z") -- Returns { {z=1}, {z=2}, {z=3} }
 lume.sort({ 1, 3, 2 }, function(a, b) return a > b end) -- Returns { 3, 2, 1 }
 ```
 
-### lume.array(...)
+#### lume.array(...)
 Iterates the supplied iterator and returns an array filled with the values.
 ```lua
-lume.array(pairs({a = 1, b = 2})) -- Returns {"a", "b"}
+lume.array(string.gmatch("Hello world", "%a+")) -- Returns {"Hello", "world"}
 ```
 
-### lume.each(t, fn, ...)
+#### lume.each(t, fn, ...)
 Iterates the table `t` and calls the function `fn` on each value followed by
 the supplied additional arguments; if `fn` is a string the method of that name
 is called for each value. The function returns `t` unmodified.
@@ -134,14 +147,14 @@ lume.each({1, 2, 3}, print) -- Prints "1", "2", "3" on separate lines
 lume.each({a, b, c}, "move", 10, 20) -- Does x:move(10, 20) on each value
 ```
 
-### lume.map(t, fn)
+#### lume.map(t, fn)
 Applies the function `fn` to each value in table `t` and returns a new table
 with the resulting values.
 ```lua
 lume.map({1, 2, 3}, function(x) return x * 2 end) -- Returns {2, 4, 6}
 ```
 
-### lume.all(t [, fn])
+#### lume.all(t [, fn])
 Returns true if all the values in `t` table are true. If a `fn` function is
 supplied it is called on each value, true is returned if all of the calls to
 `fn` return true.
@@ -149,7 +162,7 @@ supplied it is called on each value, true is returned if all of the calls to
 lume.all({1, 2, 1}, function(x) return x == 1 end) -- Returns false
 ```
 
-### lume.any(t [, fn])
+#### lume.any(t [, fn])
 Returns true if any of the values in `t` table are true. If a `fn` function is
 supplied it is called on each value, true is returned if any of the calls to
 `fn` return true.
@@ -157,7 +170,7 @@ supplied it is called on each value, true is returned if any of the calls to
 lume.any({1, 2, 1}, function(x) return x == 1 end) -- Returns true
 ```
 
-### lume.reduce(t, fn [, first])
+#### lume.reduce(t, fn [, first])
 Applies `fn` on two arguments cumulative to the items of the array `t`, from
 left to right, so as to reduce the array to a single value. If a `first` value
 is specified the accumulator is initialised to this, otherwise the first value
@@ -167,13 +180,13 @@ an error is raised,
 lume.reduce({1, 2, 3}, function(a, b) return a + b end) -- Returns 6
 ```
 
-### lume.set(t)
+#### lume.set(t)
 Returns a copy of the `t` array with all the duplicate values removed.
 ```lua
 lume.set({2, 1, 2, "cat", "cat"}) -- Returns {1, 2, "cat"}
 ```
 
-### lume.filter(t, fn [, retainkeys])
+#### lume.filter(t, fn [, retainkeys])
 Calls `fn` on each value of `t` table. Returns a new table with only the values
 where `fn` returned true. If `retainkeys` is true the table is not treated as
 an array and retains its original keys.
@@ -181,7 +194,7 @@ an array and retains its original keys.
 lume.filter({1, 2, 3, 4}, function(x) return x % 2 == 0 end) -- Returns {2, 4}
 ```
 
-### lume.reject(t, fn [, retainkeys])
+#### lume.reject(t, fn [, retainkeys])
 The opposite of `lume.filter()`: Calls `fn` on each value of `t` table; returns
 a new table with only the values where `fn` returned false. If `retainkeys` is
 true the table is not treated as an array and retains its original keys.
@@ -189,34 +202,34 @@ true the table is not treated as an array and retains its original keys.
 lume.reject({1, 2, 3, 4}, function(x) return x % 2 == 0 end) -- Returns {1, 3}
 ```
 
-### lume.merge(...)
+#### lume.merge(...)
 Returns a new table with all the given tables merged together. If a key exists
 in multiple tables the right-most table's value is used.
 ```lua
 lume.merge({a=1, b=2, c=3}, {c=8, d=9}) -- Returns {a=1, b=2, c=8, d=9}
 ```
 
-### lume.concat(...)
+#### lume.concat(...)
 Returns a new array consisting of all the given arrays concatenated into one.
 ```lua
 lume.concat({1, 2}, {3, 4}, {5, 6}) -- Returns {1, 2, 3, 4, 5, 6}
 ```
 
-### lume.find(t, value)
+#### lume.find(t, value)
 Returns the index/key of `value` in `t`. Returns `nil` if that value does not
 exist in the table.
 ```lua
 lume.find({"a", "b", "c"}, "b") -- Returns 2
 ```
 
-### lume.match(t, fn)
+#### lume.match(t, fn)
 Returns the value and key of the value in table `t` which returns true when
 `fn` is called on it. Returns `nil` if no such value exists.
 ```lua
 lume.match({1, 5, 8, 7}, function(x) return x % 2 == 0 end) -- Returns 8, 3
 ```
 
-### lume.count(t [, fn])
+#### lume.count(t [, fn])
 Counts the number of values in the table `t`. If a `fn` function is supplied it
 is called on each value, the number of times it returns true is counted.
 ```lua
@@ -224,47 +237,47 @@ lume.count({a = 2, b = 3, c = 4, d = 5}) -- Returns 4
 lume.count({1, 2, 4, 6}, function(x) return x % 2 == 0 end) -- Returns 3
 ```
 
-### lume.slice(t [, i [, j]])
+#### lume.slice(t [, i [, j]])
 Mimics the behaviour of Lua's `string.sub`, but operates on an array rather
 than a string. Creates and returns a new array of the given slice.
 ```lua
 lume.slice({"a", "b", "c", "d", "e"}, 2, 4) -- Returns {"b", "c", "d"}
 ```
 
-### lume.first(t [, n])
+#### lume.first(t [, n])
 Returns the first element of an array or nil if the array is empty. If `n` is
 specificed an array of the first `n` elements is returned.
 ```lua
 lume.first({"a", "b", "c"}) -- Returns "a"
 ```
 
-### lume.last(t [, n])
+#### lume.last(t [, n])
 Returns the last element of an array or nil if the array is empty. If `n` is
 specificed an array of the last `n` elements is returned.
 ```lua
 lume.last({"a", "b", "c"}) -- Returns "c"
 ```
 
-### lume.invert(t)
+#### lume.invert(t)
 Returns a copy of the table where the keys have become the values and the
 values the keys.
 ```lua
 lume.invert({a = "x", b = "y"}) -- returns {x = "a", y = "b"}
 ```
 
-### lume.pick(t, ...)
+#### lume.pick(t, ...)
 Returns a copy of the table filtered to only contain values for the given keys.
 ```lua
 lume.pick({ a = 1, b = 2, c = 3 }, "a", "c") -- Returns { a = 1, c = 3 }
 ```
 
-### lume.keys(t)
+#### lume.keys(t)
 Returns an array containing each key of the table.
 
-### lume.clone(t)
+#### lume.clone(t)
 Returns a shallow copy of the table `t`.
 
-### lume.fn(fn, ...)
+#### lume.fn(fn, ...)
 Creates a wrapper function around function `fn`, automatically inserting the
 arguments into `fn` which will persist every time the wrapper is called. Any
 arguments which are passed to the returned function will be inserted after the
@@ -274,7 +287,7 @@ local f = lume.fn(print, "Hello")
 f("world") -- Prints "Hello world"
 ```
 
-### lume.once(fn, ...)
+#### lume.once(fn, ...)
 Returns a wrapper function to `fn` which takes the supplied arguments. The
 wrapper function will call `fn` on the first call and do nothing on any
 subsequent calls.
@@ -284,7 +297,7 @@ f() -- Prints "Hello"
 f() -- Does nothing
 ```
 
-### lume.memoize(fn)
+#### lume.memoize(fn)
 Returns a wrapper function to `fn` where the results for any given set of
 arguments are cached. `lume.memoize()` is useful when used on functions with
 slow-running computations.
@@ -292,7 +305,7 @@ slow-running computations.
 fib = lume.memoize(function(n) return n < 2 and n or fib(n-1) + fib(n-2) end)
 ```
 
-### lume.combine(...)
+#### lume.combine(...)
 Creates a wrapper function which calls each supplied argument in the order they
 were passed to `lume.combine()`; nil arguments are ignored. The wrapper
 function passes its own arguments to each of its wrapped functions when it is
@@ -303,21 +316,21 @@ local f = lume.combine(function(a, b) print(a + b) end,
 f(3, 4) -- Prints "7" then "12" on a new line
 ```
 
-### lume.call(fn, ...)
+#### lume.call(fn, ...)
 Calls the given function with the provided arguments and returns its values. If
 `fn` is `nil` then no action is performed and the function returns `nil`.
 ```lua
 lume.call(print, "Hello world") -- Prints "Hello world"
 ```
 
-### lume.time(fn, ...)
+#### lume.time(fn, ...)
 Inserts the arguments into function `fn` and calls it. Returns the time in
 seconds the function `fn` took to execute followed by `fn`'s returned values.
 ```lua
 lume.time(function(x) return x end, "hello") -- Returns 0, "hello"
 ```
 
-### lume.lambda(str)
+#### lume.lambda(str)
 Takes a string lambda and returns a function. `str` should be a list of
 comma-separated parameters, followed by `->`, followed by the expression which
 will be evaluated and returned.
@@ -326,24 +339,24 @@ local f = lume.lambda "x,y -> 2*x+y"
 f(10, 5) -- Returns 25
 ```
 
-### lume.serialize(x)
+#### lume.serialize(x)
 Serializes the argument `x` into a string which can be loaded again using
 `lume.deserialize()`. Only booleans, numbers, tables and strings can be
-serialized. Circular references are not handled; all nested tables are
+serialized. Circular references will result in an error; all nested tables are
 serialized as unique tables.
 ```lua
 lume.serialize({a = "test", b = {1, 2, 3}, false})
 -- Returns "{[1]=false,["a"]="test",["b"]={[1]=1,[2]=2,[3]=3,},}"
 ```
 
-### lume.deserialize(str)
+#### lume.deserialize(str)
 Deserializes a string created by `lume.serialize()` and returns the resulting
 value. This function should not be run on an untrusted string.
 ```lua
 lume.deserialize("{1, 2, 3}") -- Returns {1, 2, 3}
 ```
 
-### lume.split(str [, sep])
+#### lume.split(str [, sep])
 Returns an array of the words in the string `str`. If `sep` is provided it is
 used as the delimiter, consecutive delimiters are not grouped together and will
 delimit empty strings.
@@ -352,7 +365,7 @@ lume.split("One two three") -- Returns {"One", "two", "three"}
 lume.split("a,b,,c", ",") -- Returns {"a", "b", "", "c"}
 ```
 
-### lume.trim(str [, chars])
+#### lume.trim(str [, chars])
 Trims the whitespace from the start and end of the string `str` and returns the
 new string. If a `chars` value is set the characters in `chars` are trimmed
 instead of whitespace.
@@ -360,7 +373,7 @@ instead of whitespace.
 lume.trim("  Hello  ") -- Returns "Hello"
 ```
 
-### lume.wordwrap(str [, limit])
+#### lume.wordwrap(str [, limit])
 Returns `str` wrapped to `limit` number of characters per line, by default
 `limit` is `72`. `limit` can also be a function which when passed a string,
 returns `true` if it is too long for a single line.
@@ -369,7 +382,7 @@ returns `true` if it is too long for a single line.
 lume.wordwrap("Hello world. This is a short string", 14)
 ```
 
-### lume.format(str [, vars])
+#### lume.format(str [, vars])
 Returns a formatted string. The values of keys in the table `vars` can be
 inserted into the string by using the form `"{key}"` in `str`; numerical keys
 can also be used.
@@ -378,25 +391,25 @@ lume.format("{b} hi {a}", {a = "mark", b = "Oh"}) -- Returns "Oh hi mark"
 lume.format("Hello {1}!", {"world"}) -- Returns "Hello world!"
 ```
 
-### lume.trace(...)
+#### lume.trace(...)
 Prints the current filename and line number followed by each argument separated
 by a space.
 ```lua
 -- Assuming the file is called "example.lua" and the next line is 12:
-lume.trace("hello", 1234) -- Prints "[example.lua:12] hello 1234"
+lume.trace("hello", 1234) -- Prints "example.lua:12: hello 1234"
 ```
 
-### lume.dostring(str)
+#### lume.dostring(str)
 Executes the lua code inside `str`.
 ```lua
 lume.dostring("print('Hello!')") -- Prints "Hello!"
 ```
 
-### lume.uuid()
+#### lume.uuid()
 Generates a random UUID string; version 4 as specified in
 [RFC 4122](http://www.ietf.org/rfc/rfc4122.txt).
 
-### lume.hotswap(modname)
+#### lume.hotswap(modname)
 Reloads an already loaded module in place, allowing you to immediately see the
 effects of code changes without having to restart the program. `modname` should
 be the same string used when loading the module with require(). In the case of
@@ -407,7 +420,7 @@ lume.hotswap("lume") -- Reloads the lume module
 assert(lume.hotswap("inexistant_module")) -- Raises an error
 ```
 
-### lume.ripairs(t)
+#### lume.ripairs(t)
 Performs the same function as `ipairs()` but iterates in reverse; this allows
 the removal of items from the table during iteration without any items being
 skipped.
@@ -418,7 +431,7 @@ for i, v in lume.ripairs({ "a", "b", "c" }) do
 end
 ```
 
-### lume.color(str [, mul])
+#### lume.color(str [, mul])
 Takes color string `str` and returns 4 values, one for each color channel (`r`,
 `g`, `b` and `a`). By default the returned values are between 0 and 1; the
 values are multiplied by the number `mul` if it is provided.
@@ -429,7 +442,7 @@ lume.color("#00ffff", 256)          -- Returns 0, 256, 256, 256
 lume.color("rgb(255, 0, 0)", 256)   -- Returns 256, 0, 0, 256
 ```
 
-### lume.rgba(color)
+#### lume.rgba(color)
 Takes the 32bit integer `color` argument and returns 4 numbers, one for each
 channel, with a range of 0 - 255. The returned values can be used as the
 arguments to [LÖVE](http://love2d.org)'s setColor() function.
@@ -437,7 +450,7 @@ arguments to [LÖVE](http://love2d.org)'s setColor() function.
 lume.rgba(0xFF304050) -- Returns 48, 64, 80, 255
 ```
 
-### lume.chain(value)
+#### lume.chain(value)
 Returns a wrapped object which allows chaining of lume functions. The function
 result() should be called at the end of the chain to return the resulting
 value.
@@ -488,4 +501,3 @@ lume.count(t, { age = 10 }) -- returns 2
 
 This library is free software; you can redistribute it and/or modify it under
 the terms of the MIT license. See [LICENSE](LICENSE) for details.
-

lume.lua

@@ -1,25 +1,22 @@
 --
 -- lume
 --
--- Copyright (c) 2015 rxi
+-- Copyright (c) 2017 rxi
 --
 -- This library is free software; you can redistribute it and/or modify it
 -- under the terms of the MIT license. See LICENSE for details.
 --
 
-local lume = { _version = "2.2.0" }
+local lume = { _version = "2.3.0" }
 
 local pairs, ipairs = pairs, ipairs
 local type, assert, unpack = type, assert, unpack or table.unpack
 local tostring, tonumber = tostring, tonumber
 local math_floor = math.floor
 local math_ceil = math.ceil
-local math_random = math.random
-local math_cos = math.cos
 local math_atan2 = math.atan2 or math.atan
 local math_sqrt = math.sqrt
 local math_abs = math.abs
-local math_pi = math.pi
 
 local noop = function()
 end
@@ -42,12 +39,8 @@ local iscallable = function(x)
   return mt and mt.__call ~= nil
 end
 
-local isarray = function(x)
-  return (type(x) == "table" and x[1] ~= nil) and true or false
-end
-
 local getiter = function(x)
-  if isarray(x) then
+  if lume.isarray(x) then
     return ipairs
   elseif type(x) == "table" then
     return pairs
@@ -117,21 +110,26 @@ function lume.angle(x1, y1, x2, y2)
 end
 
 
+function lume.vector(angle, magnitude)
+  return math.cos(angle) * magnitude, math.sin(angle) * magnitude
+end
+
+
 function lume.random(a, b)
   if not a then a, b = 0, 1 end
   if not b then b = 0 end
-  return a + math_random() * (b - a)
+  return a + math.random() * (b - a)
 end
 
 
 function lume.randomchoice(t)
-  return t[math_random(#t)]
+  return t[math.random(#t)]
 end
 
 
 function lume.weightedchoice(t)
   local sum = 0
-  for k, v in pairs(t) do
+  for _, v in pairs(t) do
     assert(v >= 0, "weight value less than zero")
     sum = sum + v
   end
@@ -144,6 +142,11 @@ function lume.weightedchoice(t)
 end
 
 
+function lume.isarray(x)
+  return (type(x) == "table" and x[1] ~= nil) and true or false
+end
+
+
 function lume.push(t, ...)
   local n = select("#", ...)
   for i = 1, n do
@@ -157,7 +160,7 @@ function lume.remove(t, x)
   local iter = getiter(t)
   for i, v in iter(t) do
     if v == x then
-      if isarray(t) then
+      if lume.isarray(t) then
         table.remove(t, i)
         break
       else
@@ -172,7 +175,7 @@ end
 
 function lume.clear(t)
   local iter = getiter(t)
-  for k, v in iter(t) do
+  for k in iter(t) do
     t[k] = nil
   end
   return t
@@ -195,7 +198,7 @@ end
 function lume.shuffle(t)
   local rtn = {}
   for i = 1, #t do
-    local r = math_random(i)
+    local r = math.random(i)
     if r ~= i then
       rtn[i] = rtn[r]
     end
@@ -250,7 +253,7 @@ end
 function lume.all(t, fn)
   fn = iteratee(fn)
   local iter = getiter(t)
-  for k, v in iter(t) do
+  for _, v in iter(t) do
     if not fn(v) then return false end
   end
   return true
@@ -260,7 +263,7 @@ end
 function lume.any(t, fn)
   fn = iteratee(fn)
   local iter = getiter(t)
-  for k, v in iter(t) do
+  for _, v in iter(t) do
     if fn(v) then return true end
   end
   return false
@@ -271,7 +274,7 @@ function lume.reduce(t, fn, first)
   local acc = first
   local started = first and true or false
   local iter = getiter(t)
-  for k, v in iter(t) do
+  for _, v in iter(t) do
     if started then
       acc = fn(acc, v)
     else
@@ -286,7 +289,7 @@ end
 
 function lume.set(t)
   local rtn = {}
-  for k, v in pairs(lume.invert(t)) do
+  for k in pairs(lume.invert(t)) do
     rtn[#rtn + 1] = k
   end
   return rtn
@@ -302,7 +305,7 @@ function lume.filter(t, fn, retainkeys)
       if fn(v) then rtn[k] = v end
     end
   else
-    for k, v in iter(t) do
+    for _, v in iter(t) do
       if fn(v) then rtn[#rtn + 1] = v end
     end
   end
@@ -319,7 +322,7 @@ function lume.reject(t, fn, retainkeys)
       if not fn(v) then rtn[k] = v end
     end
   else
-    for k, v in iter(t) do
+    for _, v in iter(t) do
       if not fn(v) then rtn[#rtn + 1] = v end
     end
   end
@@ -346,7 +349,7 @@ function lume.concat(...)
     local t = select(i, ...)
     if t ~= nil then
       local iter = getiter(t)
-      for k, v in iter(t) do
+      for _, v in iter(t) do
         rtn[#rtn + 1] = v
       end
     end
@@ -379,14 +382,14 @@ function lume.count(t, fn)
   local iter = getiter(t)
   if fn then
     fn = iteratee(fn)
-    for k, v in iter(t) do
+    for _, v in iter(t) do
       if fn(v) then count = count + 1 end
     end
   else
-    if isarray(t) then
+    if lume.isarray(t) then
       return #t
     end
-    for k in iter(t) do count = count + 1 end
+    for _ in iter(t) do count = count + 1 end
   end
   return count
 end
@@ -435,7 +438,7 @@ end
 function lume.keys(t)
   local rtn = {}
   local iter = getiter(t)
-  for k, v in iter(t) do rtn[#rtn + 1] = k end
+  for k in iter(t) do rtn[#rtn + 1] = k end
   return rtn
 end
 
@@ -458,12 +461,12 @@ end
 
 
 function lume.once(fn, ...)
-  local fn = lume.fn(fn, ...)
+  local f = lume.fn(fn, ...)
   local done = false
   return function(...)
     if done then return end
     done = true
-    return fn(...)
+    return f(...)
   end
 end
 
@@ -536,19 +539,41 @@ function lume.lambda(str)
 end
 
 
-function lume.serialize(x)
-  local f = { string = function(v) return string.format("%q", v) end,
-              number = tostring, boolean = tostring }
-  f.table = function(t)
+local serialize
+
+local serialize_map = {
+  [ "boolean" ] = tostring,
+  [ "nil"     ] = tostring,
+  [ "string"  ] = function(v) return string.format("%q", v) end,
+  [ "number"  ] = function(v)
+    if      v ~=  v     then return  "0/0"      --  nan
+    elseif  v ==  1 / 0 then return  "1/0"      --  inf
+    elseif  v == -1 / 0 then return "-1/0" end  -- -inf
+    return tostring(v)
+  end,
+  [ "table"   ] = function(t, stk)
+    stk = stk or {}
+    if stk[t] then error("circular reference") end
     local rtn = {}
+    stk[t] = true
     for k, v in pairs(t) do
-      rtn[#rtn + 1] = "[" .. f[type(k)](k) .. "]=" .. f[type(v)](v) .. ","
+      rtn[#rtn + 1] = "[" .. serialize(k, stk) .. "]=" .. serialize(v, stk)
     end
-    return "{" .. table.concat(rtn) .. "}"
+    stk[t] = nil
+    return "{" .. table.concat(rtn, ",") .. "}"
   end
-  local err = function(t,k) error("unsupported serialize type: " .. k) end
-  setmetatable(f, { __index = err })
-  return f[type(x)](x)
+}
+
+setmetatable(serialize_map, {
+  __index = function(_, k) error("unsupported serialize type: " .. k) end
+})
+
+serialize = function(x, stk)
+  return serialize_map[type(x)](x, stk)
+end
+
+function lume.serialize(x)
+  return serialize(x)
 end
 
 
@@ -579,19 +604,19 @@ function lume.wordwrap(str, limit)
   limit = limit or 72
   local check
   if type(limit) == "number" then
-    check = function(str) return #str >= limit end
+    check = function(s) return #s >= limit end
   else
     check = limit
   end
   local rtn = {}
   local line = ""
   for word, spaces in str:gmatch("(%S+)(%s*)") do
-    local str = line .. word
-    if check(str) then
+    local s = line .. word
+    if check(s) then
       table.insert(rtn, line .. "\n")
       line = word
     else
-      line = str
+      line = s
     end
     for c in spaces:gmatch(".") do
       if c == "\n" then
@@ -618,7 +643,7 @@ end
 
 function lume.trace(...)
   local info = debug.getinfo(2, "Sl")
-  local t = { "[" .. info.short_src .. ":" .. info.currentline .. "]" }
+  local t = { info.short_src .. ":" .. info.currentline .. ":" }
   for i = 1, select("#", ...) do
     local x = select(i, ...)
     if type(x) == "number" then
@@ -637,7 +662,7 @@ end
 
 function lume.uuid()
   local fn = function(x)
-    local r = math_random(16) - 1
+    local r = math.random(16) - 1
     r = (x == "x") and (r + 1) or (r % 4) + 9
     return ("0123456789abcdef"):sub(r, r)
   end
@@ -659,7 +684,7 @@ function lume.hotswap(modname)
   end
   local err = nil
   local function onerror(e)
-    for k, v in pairs(_G) do _G[k] = oldglobal[k] end
+    for k in pairs(_G) do _G[k] = oldglobal[k] end
     err = lume.trim(e)
   end
   local ok, oldmod = pcall(require, modname)
@@ -738,7 +763,7 @@ function lume.chain(value)
 end
 
 setmetatable(lume,  {
-  __call = function(t, ...)
+  __call = function(_, ...)
     return lume.chain(...)
   end
 })

test/test.lua

@@ -1,4 +1,4 @@
-local tester = require "tester"
+local tester = require "util.tester"
 
 package.path = "../?.lua;" .. package.path
 
@@ -80,6 +80,18 @@ tests["lume.angle"] = function()
   testeq( lume.angle(10, 10, 10, 30), math.rad(90)  )
 end
 
+-- lume.vector
+tests["lume.vector"] = function()
+  local function cmp(a, b) return math.abs(a - b) < 10e-6 end
+  local x, y
+  x, y = lume.vector(0, 10)
+  testeq( cmp(x, 10) and cmp(y, 0), true )
+  x, y = lume.vector(math.pi, 100)
+  testeq( cmp(x, -100) and cmp(y, 0), true )
+  x, y = lume.vector(math.pi * 0.25, 100)
+  testeq( cmp(x, 70.71067811865476) and cmp(y, 70.71067811865476), true )
+end
+
 -- lume.random
 tests["lume.random"] = function()
   testeq( type(lume.random()),      "number" )
@@ -484,6 +496,10 @@ tests["lume.serialize, lume.deserialize"] = function()
   local t = { 1, 2, 3, 4, true, false, "cat", "dog", {1, 2, 3} }
   local s = lume.serialize(t)
   testeq( lume.deserialize(s), t )
+  testeq( lume.deserialize(lume.serialize(math.huge)), math.huge )
+  testeq( lume.deserialize(lume.serialize(-math.huge)), -math.huge )
+  local x = lume.deserialize(lume.serialize(0 / 0)) -- nan
+  testeq( x ~= x, true )
 end
 
 -- lume.split
@@ -535,7 +551,7 @@ tests["lume.trace"] = function()
   local oldprint = print
   local file, line, msg
   print = function(x)
-    file, line, msg = x:match("%[(.-):(.-)%] (.*)")
+    file, line, msg = x:match("(.-):(.-): (.*)")
   end
   lume.trace("Hi world", 123.456, 1, nil)
   print = oldprint
@@ -613,4 +629,3 @@ end
 tester.dotests(tests)
 tester.test.global()
 tester.printresults()
-