1 files changed, 46 insertions, 0 deletions
diff --git a/day8.py b/day8.py
new file mode 100644
index 0000000..868aeb1
--- /dev/null
+++ b/day8.py
@@ -0,0 +1,46 @@
+import numpy as np
+import re
+
+def parse_line(line: str):
+    '''
+    rect/rotate = 0/1
+    row/col = 0/1
+    dims = int/int
+    '''
+    splitline = line.strip().split()
+    if splitline[0] == 'rect':
+        col, row = map(int, splitline[-1].split('x'))
+        return (0, -1, col, row)
+    else:
+        dim, offset = map(int, re.findall(r'\d+', line))
+        if splitline[1] == 'row':
+            return (1, 0, dim, offset)
+        else:
+            return (1, 1, dim, offset)
+
+with open('day8.txt') as data:
+    insts = [parse_line(line) for line in data]
+
+def part1(instructions):
+    grid = np.zeros((6, 50), dtype=bool)
+    for inst in instructions:
+        match inst:
+            case 0, _, col, row:
+                grid[0:row, 0:col] = True
+            case 1, axis, dim, offset:
+                if axis == 0:
+                    grid[dim] = np.roll(grid[dim], offset)
+                else:
+                    grid[:, dim] = np.roll(grid[:, dim], offset)
+    return grid
+
+def part2(instructions):
+    grid = part1(instructions)
+    printable = np.zeros_like(grid, dtype=str)
+    printable[grid] = "*"
+    printable[~grid] = " "
+    for line in printable:
+        print("".join(char for char in line))
+
+print(np.count_nonzero(part1(insts)))
+part2(insts)
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