1 files changed, 67 insertions, 0 deletions
diff --git a/tex/context/base/supp-ran.lua b/tex/context/base/supp-ran.lua
new file mode 100644
index 000000000..fe635fc7f
--- /dev/null
+++ b/tex/context/base/supp-ran.lua
@@ -0,0 +1,67 @@
+if not modules then modules = { } end modules ['supp-ran'] = {
+    version   = 1.001,
+    comment   = "companion to supp-ran.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- We cannot ask for the current seed, so we need some messy hack
+-- here.
+
+commands = commands or { }
+
+local random, randomseed, round, seed, last = math.random, math.randomseed, math.round, false, 1
+local texwrite = tex.write
+
+function math.setrandomseedi(n,comment)
+    if n <= 1 then
+        n = n*1073741823 -- maxcount
+    end
+    n = round(n)
+    if false then
+        logs.report("system","setting random seed to %s (%s)",n,comment or "normal")
+    end
+    randomseed(n)
+    last = random(0,1073741823) -- we need an initial value
+end
+
+function commands.getrandomcounta(min,max)
+    last = random(min,max)
+    texwrite(last)
+end
+
+function commands.getrandomcountb(min,max)
+    last = random(min,max)/65536
+    texwrite(last)
+end
+
+function commands.setrandomseed(n)
+    last = n
+    math.setrandomseedi(n)
+end
+
+function commands.getrandomseed(n)
+    texwrite(last)
+end
+
+-- maybe stack
+
+function commands.freezerandomseed(n)
+ -- print("<<<<",seed,last)
+    if seed == false or seed == nil then
+        seed = last
+        math.setrandomseedi(seed,"freeze",seed)
+    end
+    if n then
+        randomseed(n)
+    end
+end
+
+function commands.defrostrandomseed()
+ -- print(">>>>",seed,last)
+    if seed ~= false then
+        math.setrandomseedi(seed,"defrost",seed) -- was last (bug)
+        seed = false
+    end
+end