Version 2.2.0

README.md

@@ -98,6 +98,14 @@ local t = { 1, 2, 3 }
 lume.clear(t) -- `t` becomes {}
 ```
 
+### 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
+local t = { a = 1, b = 2 }
+lume.extend(t, { b = 4, c = 6 }) -- `t` becomes { a = 1, b = 4, c = 6 }
+```
+
 ### lume.shuffle(t)
 Returns a shuffled copy of the array `t`.
 
@@ -244,6 +252,12 @@ values the keys.
 lume.invert({a = "x", b = "y"}) -- returns {x = "a", y = "b"}
 ```
 
+### 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)
 Returns an array containing each key of the table.
 
@@ -404,6 +418,17 @@ for i, v in lume.ripairs({ "a", "b", "c" }) do
 end
 ```
 
+### 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.
+```lua
+lume.color("#ff0000")               -- Returns 1, 0, 0, 1
+lume.color("rgba(255, 0, 255, .5)") -- Returns 1, 0, 1, .5
+lume.color("#00ffff", 256)          -- Returns 0, 256, 256, 256
+lume.color("rgb(255, 0, 0)", 256)   -- Returns 256, 0, 0, 256
+```
+
 ### 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

lume.lua

@@ -7,7 +7,7 @@
 -- under the terms of the MIT license. See LICENSE for details.
 --
 
-local lume = { _version = "2.1.0" }
+local lume = { _version = "2.2.0" }
 
 local pairs, ipairs = pairs, ipairs
 local type, assert, unpack = type, assert, unpack or table.unpack
@@ -46,10 +46,6 @@ local isarray = function(x)
   return (type(x) == "table" and x[1] ~= nil) and true or false
 end
 
-local iternil = function()
-  return noop
-end
-
 local getiter = function(x)
   if isarray(x) then
     return ipairs
@@ -82,7 +78,7 @@ end
 
 function lume.round(x, increment)
   if increment then return lume.round(x / increment) * increment end
-  return x > 0 and math_floor(x + .5) or math_ceil(x - .5)
+  return x >= 0 and math_floor(x + .5) or math_ceil(x - .5)
 end
 
 
@@ -183,6 +179,19 @@ function lume.clear(t)
 end
 
 
+function lume.extend(t, ...)
+  for i = 1, select("#", ...) do
+    local x = select(i, ...)
+    if x then
+      for k, v in pairs(x) do
+        t[k] = v
+      end
+    end
+  end
+  return t
+end
+
+
 function lume.shuffle(t)
   local rtn = {}
   for i = 1, #t do
@@ -413,6 +422,16 @@ function lume.invert(t)
 end
 
 
+function lume.pick(t, ...)
+  local rtn = {}
+  for i = 1, select("#", ...) do
+    local k = select(i, ...)
+    rtn[k] = t[k]
+  end
+  return rtn
+end
+
+
 function lume.keys(t)
   local rtn = {}
   local iter = getiter(t)
@@ -565,20 +584,26 @@ function lume.wordwrap(str, limit)
     check = limit
   end
   local rtn = {}
-  for j, line in ipairs(lume.split(str, "\n")) do
-    local str
-    for i, word in ipairs(lume.split(line)) do
-      local s = (str and (str .. " ") or "") .. word
-      if check(s) then
-        rtn[#rtn + 1] = str
-        str = word
+  local line = ""
+  for word, spaces in str:gmatch("(%S+)(%s*)") do
+    local str = line .. word
+    if check(str) then
+      table.insert(rtn, line .. "\n")
+      line = word
+    else
+      line = str
+    end
+    for c in spaces:gmatch(".") do
+      if c == "\n" then
+        table.insert(rtn, line .. "\n")
+        line = ""
       else
-        str = s
+        line = line .. c
       end
     end
-    rtn[#rtn + 1] = str
   end
-  return table.concat(rtn, "\n")
+  table.insert(rtn, line)
+  return table.concat(rtn)
 end
 
 
@@ -663,13 +688,32 @@ local ripairs_iter = function(t, i)
 end
 
 function lume.ripairs(t)
-  if t == nil then
-    return noop
-  end
   return ripairs_iter, t, (#t + 1)
 end
 
 
+function lume.color(str, mul)
+  mul = mul or 1
+  local r, g, b, a
+  r, g, b = str:match("#(%x%x)(%x%x)(%x%x)")
+  if r then
+    r = tonumber(r, 16) / 0xff
+    g = tonumber(g, 16) / 0xff
+    b = tonumber(b, 16) / 0xff
+    a = 1
+  elseif str:match("rgba?%s*%([%d%s%.,]+%)") then
+    local f = str:gmatch("[%d.]+")
+    r = (f() or 0) / 0xff
+    g = (f() or 0) / 0xff
+    b = (f() or 0) / 0xff
+    a = f() or 1
+  else
+    error(("bad color string '%s'"):format(str))
+  end
+  return r * mul, g * mul, b * mul, a * mul
+end
+
+
 function lume.rgba(color)
   local a = math_floor((color / 16777216) % 256)
   local r = math_floor((color /    65536) % 256)

test/test_lume.lua

@@ -145,6 +145,16 @@ tests["lume.clear"] = function()
   testeq( lume.clear(t) == t, true )
 end
 
+-- lume.extend
+tests["lume.extend"] = function()
+  local t = { a = 10, b = 20, c = 30 }
+  testeq( lume.extend(t) == t, true )
+  lume.extend(t, { d = 40 }, { e = 50 })
+  testeq( t, { a = 10, b = 20, c = 30, d = 40, e = 50 } )
+  lume.extend(t, { a = "cat", b = "dog" }, { b = "owl", c = "fox" })
+  testeq( t, { a = "cat", b = "owl", c = "fox", d = 40, e = 50 } )
+end
+
 -- lume.shuffle
 tests["lume.shuffle"] = function()
   local t = {1, 2, 3, 4, 5}
@@ -363,6 +373,15 @@ tests["lume.invert"] = function()
   testeq( lume.invert(lume.invert{a = 1, b = 2}), {a = 1, b = 2}      )
 end
 
+-- lume.pick
+tests["lume.pick"] = function()
+  local t = { cat = 10, dog = 20, fox = 30, owl = 40 }
+  testeq( lume.pick(t, "cat", "dog"), { cat = 10, dog = 20 } )
+  testeq( lume.pick(t, "fox", "owl"), { fox = 30, owl = 40 } )
+  testeq( lume.pick(t, "owl"), { owl = 40 } )
+  testeq( lume.pick(t), {} )
+end
+
 -- lume.keys
 tests["lume.keys"] = function()
   testeq( lume.keys({}), {} )
@@ -491,8 +510,8 @@ end
 
 -- lume.wordwrap
 tests["lume.wordwrap"] = function()
-  local str = "A small string with some words and then some more words"
-  local b = "A small string with\nsome words and then\nsome more words"
+  local str = "A small string with some words and then some more   words"
+  local b = "A small string with \nsome words and then \nsome more   words"
   local fn = function(str) return #str >= 20 end
   testeq( lume.wordwrap(str),     str )
   testeq( lume.wordwrap(str, 20), b   )
@@ -552,8 +571,24 @@ tests["lume.ripairs"] = function()
     table.insert(r, { i, v })
   end
   testeq( r, { { 3, "c" }, { 2, "b" }, { 1, "a" } })
-  for i, v in lume.ripairs(nil) do
-  end
+  tester.test.error(lume.ripairs, nil)
+end
+
+-- lume.color
+tests["lume.color"] = function()
+  testeq({ lume.color("#ff0000") },                   { 1, 0, 0, 1 }  )
+  testeq({ lume.color("#00ff00") },                   { 0, 1, 0, 1 }  )
+  testeq({ lume.color("#0000ff") },                   { 0, 0, 1, 1 }  )
+  testeq({ lume.color("rgb( 255, 255, 255 )") },      { 1, 1, 1, 1 }  )
+  testeq({ lume.color("rgb (0, 0, 0)") },             { 0, 0, 0, 1 }  )
+  testeq({ lume.color("rgba(255, 255, 255, .5)") },   { 1, 1, 1, .5 } )
+  testeq({ lume.color("#ffffff", 2) },                { 2, 2, 2, 2 }  )
+  testeq({ lume.color("rgba(255, 255, 255, 1)", 3) }, { 3, 3, 3, 3 }  )
+  tester.test.error(lume.color, "#ff00f")
+  tester.test.error(lume.color, "#xyzxyz")
+  tester.test.error(lume.color, "rgba(hello)")
+  tester.test.error(lume.color, "rgba()")
+  tester.test.error(lume.color, "rgba(1, 1, 1, 1")
 end
 
 -- lume.rgba