Splice ./universe directory into ./

Manually merging:
- README.md: I added the description from universe/README.md into the heading of
  dotfiles/README.md.
- .envrc: dotfiles/.envrc was a superset of universe/.envrc
- .gitignore: Adding some of the ignored patterns from universe/.gitignore to
  dotfiles/.gitignore

Everything else here should be a simple rename.

1 files changed, 170 insertions, 0 deletions

diff --git a/advent-of-code/day_5.py b/advent-of-code/day_5.py
new file mode 100644
index 000000000000..3d82846e6126
--- /dev/null
+++ b/advent-of-code/day_5.py
@@ -0,0 +1,170 @@
+x = [
+    3, 225, 1, 225, 6, 6, 1100, 1, 238, 225, 104, 0, 1102, 31, 68, 225, 1001,
+    13, 87, 224, 1001, 224, -118, 224, 4, 224, 102, 8, 223, 223, 1001, 224, 7,
+    224, 1, 223, 224, 223, 1, 174, 110, 224, 1001, 224, -46, 224, 4, 224, 102,
+    8, 223, 223, 101, 2, 224, 224, 1, 223, 224, 223, 1101, 13, 60, 224, 101,
+    -73, 224, 224, 4, 224, 102, 8, 223, 223, 101, 6, 224, 224, 1, 224, 223,
+    223, 1101, 87, 72, 225, 101, 47, 84, 224, 101, -119, 224, 224, 4, 224,
+    1002, 223, 8, 223, 1001, 224, 6, 224, 1, 223, 224, 223, 1101, 76, 31, 225,
+    1102, 60, 43, 225, 1102, 45, 31, 225, 1102, 63, 9, 225, 2, 170, 122, 224,
+    1001, 224, -486, 224, 4, 224, 102, 8, 223, 223, 101, 2, 224, 224, 1, 223,
+    224, 223, 1102, 29, 17, 224, 101, -493, 224, 224, 4, 224, 102, 8, 223, 223,
+    101, 1, 224, 224, 1, 223, 224, 223, 1102, 52, 54, 225, 1102, 27, 15, 225,
+    102, 26, 113, 224, 1001, 224, -1560, 224, 4, 224, 102, 8, 223, 223, 101, 7,
+    224, 224, 1, 223, 224, 223, 1002, 117, 81, 224, 101, -3645, 224, 224, 4,
+    224, 1002, 223, 8, 223, 101, 6, 224, 224, 1, 223, 224, 223, 4, 223, 99, 0,
+    0, 0, 677, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1105, 0, 99999, 1105, 227, 247,
+    1105, 1, 99999, 1005, 227, 99999, 1005, 0, 256, 1105, 1, 99999, 1106, 227,
+    99999, 1106, 0, 265, 1105, 1, 99999, 1006, 0, 99999, 1006, 227, 274, 1105,
+    1, 99999, 1105, 1, 280, 1105, 1, 99999, 1, 225, 225, 225, 1101, 294, 0, 0,
+    105, 1, 0, 1105, 1, 99999, 1106, 0, 300, 1105, 1, 99999, 1, 225, 225, 225,
+    1101, 314, 0, 0, 106, 0, 0, 1105, 1, 99999, 8, 226, 677, 224, 102, 2, 223,
+    223, 1005, 224, 329, 1001, 223, 1, 223, 1108, 677, 226, 224, 102, 2, 223,
+    223, 1006, 224, 344, 101, 1, 223, 223, 108, 677, 226, 224, 102, 2, 223,
+    223, 1006, 224, 359, 101, 1, 223, 223, 7, 677, 226, 224, 102, 2, 223, 223,
+    1005, 224, 374, 101, 1, 223, 223, 1007, 226, 677, 224, 102, 2, 223, 223,
+    1005, 224, 389, 101, 1, 223, 223, 8, 677, 677, 224, 102, 2, 223, 223, 1006,
+    224, 404, 1001, 223, 1, 223, 1007, 677, 677, 224, 1002, 223, 2, 223, 1006,
+    224, 419, 101, 1, 223, 223, 1108, 677, 677, 224, 1002, 223, 2, 223, 1005,
+    224, 434, 1001, 223, 1, 223, 1107, 226, 677, 224, 102, 2, 223, 223, 1005,
+    224, 449, 101, 1, 223, 223, 107, 226, 226, 224, 102, 2, 223, 223, 1006,
+    224, 464, 101, 1, 223, 223, 1108, 226, 677, 224, 1002, 223, 2, 223, 1005,
+    224, 479, 1001, 223, 1, 223, 7, 677, 677, 224, 102, 2, 223, 223, 1006, 224,
+    494, 1001, 223, 1, 223, 1107, 677, 226, 224, 102, 2, 223, 223, 1005, 224,
+    509, 101, 1, 223, 223, 107, 677, 677, 224, 1002, 223, 2, 223, 1006, 224,
+    524, 101, 1, 223, 223, 1008, 677, 677, 224, 1002, 223, 2, 223, 1006, 224,
+    539, 101, 1, 223, 223, 7, 226, 677, 224, 1002, 223, 2, 223, 1005, 224, 554,
+    101, 1, 223, 223, 108, 226, 226, 224, 1002, 223, 2, 223, 1006, 224, 569,
+    101, 1, 223, 223, 1008, 226, 677, 224, 102, 2, 223, 223, 1005, 224, 584,
+    101, 1, 223, 223, 8, 677, 226, 224, 1002, 223, 2, 223, 1005, 224, 599, 101,
+    1, 223, 223, 1007, 226, 226, 224, 1002, 223, 2, 223, 1005, 224, 614, 101,
+    1, 223, 223, 1107, 226, 226, 224, 1002, 223, 2, 223, 1006, 224, 629, 101,
+    1, 223, 223, 107, 677, 226, 224, 1002, 223, 2, 223, 1005, 224, 644, 1001,
+    223, 1, 223, 1008, 226, 226, 224, 1002, 223, 2, 223, 1006, 224, 659, 101,
+    1, 223, 223, 108, 677, 677, 224, 1002, 223, 2, 223, 1005, 224, 674, 1001,
+    223, 1, 223, 4, 223, 99, 226
+]
+
+# Interpretter spec:
+# Op-code width: 2
+# ABCDE
+# A:  Mode of 3rd parameter
+# B:  Mode of 2rd parameter
+# C:  Mode of 1st parameter
+# DE: 2-digit op-code
+#
+# Not every op-code has the same arity.
+#
+# Parameter modes:
+# - positional: index of memory. 0
+# - immediate: raw value. 1
+# Assert that you never attempt to write to an "immediate value"
+
+# Parameter modes
+POS = '0'  # positional parameter mode
+VAL = '1'  # immediate parameter mode
+
+
+# Pasted from day-2.py
+# interpretter :: Int -> [Int] -> [Int] -> IO ()
+def interpret(i, x, argv=[], outs=[]):
+    """Values in `argv` will be applied to any `input` fields."""
+    # The widest op-code we'll see is 3 + 2 = 5 for either addition or
+    # multiplication since each of those is a 3-arity function with a two-digit
+    # op-code.
+    instruction = '{:05d}'.format(x[i])
+    op = instruction[-2:]
+
+    if op == '01':
+        a, b, out = x[i + 1], x[i + 2], x[i + 3]
+        mode_a, mode_b, mode_out = instruction[2], instruction[1], instruction[
+            0]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        assert mode_out == POS
+        x[out] = a + b
+        return interpret(i + 4, x, argv=argv, outs=outs)
+    elif op == '02':
+        a, b, out = x[i + 1], x[i + 2], x[i + 3]
+        mode_a, mode_b, mode_out = instruction[2], instruction[1], instruction[
+            0]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        assert mode_out == POS
+        x[out] = a * b
+        return interpret(i + 4, x, argv=argv, outs=outs)
+    # input
+    elif op == '03':
+        a = x[i + 1]
+        mode_a = instruction[2]
+        assert mode_a == POS
+        # What's the pythonic way to defensively get this value?
+        if len(argv) and argv[0] is not None:
+            x[a] = argv[0]
+            return interpret(i + 2, x, argv=argv[1:], outs=outs)
+        elif len(outs) and outs[-1] is not None:
+            x[a] = outs[-1]
+            return interpret(i + 2, x, argv=argv, outs=outs)
+        else:
+            # Here we want to block until the user applies input. This could be
+            # done easily with message passing for something similar.
+            x[a] = int(input('Enter: '))
+            return interpret(i + 2, x, argv=argv)
+    # output
+    elif op == '04':
+        a = x[i + 1]
+        mode_a = instruction[2]
+        a = a if mode_a == VAL else x[a]
+        outs.append(a)
+        return interpret(i + 2, x, argv=argv, outs=outs)
+    # jump-if-true
+    elif op == '05':
+        a, b = x[i + 1], x[i + 2]
+        mode_a, mode_b = instruction[2], instruction[1]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        if a != 0:
+            return interpret(b, x, argv=argv, outs=outs)
+        else:
+            return interpret(i + 3, x, argv=argv, outs=outs)
+    # jump-if-false
+    elif op == '06':
+        a, b = x[i + 1], x[i + 2]
+        mode_a, mode_b = instruction[2], instruction[1]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        if a == 0:
+            return interpret(b, x, argv=argv, outs=outs)
+        else:
+            return interpret(i + 3, x, argv=argv, outs=outs)
+        pass
+    # less than
+    elif op == '07':
+        a, b, out = x[i + 1], x[i + 2], x[i + 3]
+        mode_a, mode_b, mode_out = instruction[2], instruction[1], instruction[
+            0]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        assert mode_out == POS
+        if a < b:
+            x[out] = 1
+        else:
+            x[out] = 0
+        return interpret(i + 4, x, argv=argv, outs=outs)
+    # equals
+    elif op == '08':
+        a, b, out = x[i + 1], x[i + 2], x[i + 3]
+        mode_a, mode_b, mode_out = instruction[2], instruction[1], instruction[
+            0]
+        a = a if mode_a == VAL else x[a]
+        b = b if mode_b == VAL else x[b]
+        assert mode_out == POS
+        if a == b:
+            x[out] = 1
+        else:
+            x[out] = 0
+        return interpret(i + 4, x, argv=argv, outs=outs)
+    elif op == '99':
+        return x[0]
+    else:
+        raise Exception('Unsupported opcode: {}.'.format(op))