Added a lot of stdlib's to lib/ and many small fixes. (0.16.4)

lib/math.fun

@@ -0,0 +1,90 @@
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-10-01
+ */
+
+// Math helpers
+
+fun abs(x)
+  if (x < 0)
+    return -x
+  return x
+
+fun clamp(x, lo, hi)
+  v = x
+  if (v < lo) v = lo
+  if (v > hi) v = hi
+  return v
+
+fun gcd(a, b)
+  number x = abs(a)
+  number y = abs(b)
+  while y != 0
+    t = x % y
+    x = y
+    y = t
+  return x
+
+fun lcm(a, b)
+  if (a == 0) || (b == 0)
+    return 0
+  return abs(a * b) / gcd(a, b)
+
+// integer exponent (exp >= 0)
+fun powi(base, exp)
+  number e = exp
+  if (e < 0)
+    // simple fallback for negative: 0 for now (no floats)
+    return 0
+  number result = 1
+  number b = base
+  while e > 0
+    if (e % 2 == 1)
+      result = result * b
+    b = b * b
+    e = e / 2
+  return result
+
+// Min/Max over three numbers
+fun min3(a, b, c)
+  m = a
+  if (b < m) m = b
+  if (c < m) m = c
+  return m
+
+fun max3(a, b, c)
+  m = a
+  if (b > m) m = b
+  if (c > m) m = c
+  return m
+
+// Array min/max (for non-empty arrays)
+fun array_min(arr)
+  number n = len(arr)
+  if (n == 0)
+    return 0
+  m = arr[0]
+  number i = 1
+  while i < n
+    if (arr[i] < m)
+      m = arr[i]
+    i = i + 1
+  return m
+
+fun array_max(arr)
+  number n = len(arr)
+  if (n == 0)
+    return 0
+  m = arr[0]
+  number i = 1
+  while i < n
+    if (arr[i] > m)
+      m = arr[i]
+    i = i + 1
+  return m