Copy more code from Minetest

diff --git a/init.lua b/init.lua
index 38b4b23852a2c398bb6f9d6e6984c8642b3fd96f..257767b286ade08a5762a6f8392ccfce561c8108 100644 (file)
--- a/init.lua
+++ b/init.lua
@@ -1,7 +1,3 @@
-function math.clamp(min, max, v)
-       return math.max(max, math.min(min, v))
-end
-
 function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
        delim = delim or ","
        max_splits = max_splits or -2
@@ -26,6 +22,57 @@ function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
        return items
 end
 
+function table.indexof(list, val)
+       for i, v in ipairs(list) do
+               if v == val then
+                       return i
+               end
+       end
+       return -1
+end
+
+function string:trim()
+       return (self:gsub("^%s*(.-)%s*$", "%1"))
+end
+
+function math.hypot(x, y)
+       return math.sqrt(x * x + y * y)
+end
+
+function math.sign(x, tolerance)
+       tolerance = tolerance or 0
+       if x > tolerance then
+               return 1
+       elseif x < -tolerance then
+               return -1
+       end
+       return 0
+end
+
+function math.factorial(x)
+       assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer")
+       if x >= 171 then
+               -- 171! is greater than the biggest double, no need to calculate
+               return math.huge
+       end
+       local v = 1
+       for k = 2, x do
+               v = v * k
+       end
+       return v
+end
+
+function math.round(x)
+       if x >= 0 then
+               return math.floor(x + 0.5)
+       end
+       return math.ceil(x - 0.5)
+end
+
+function math.clamp(min, max, v)
+       return math.max(max, math.min(min, v))
+end
+
 function table.copy(t, seen)
        local n = {}
        seen = seen or {}
@@ -36,3 +83,31 @@ function table.copy(t, seen)
        end
        return n
 end
+
+function table.insert_all(t, other)
+       for i=1, #other do
+               t[#t + 1] = other[i]
+       end
+       return t
+end
+
+function table.key_value_swap(t)
+       local ti = {}
+       for k,v in pairs(t) do
+               ti[v] = k
+       end
+       return ti
+end
+
+function table.shuffle(t, from, to, random)
+       from = from or 1
+       to = to or #t
+       random = random or math.random
+       local n = to - from + 1
+       while n > 1 do
+               local r = from + n-1
+               local l = from + random(0, n-1)
+               t[l], t[r] = t[r], t[l]
+               n = n-1
+       end
+end