standalone prettyprinter for solutions

solutions/aoc.nim

@@ -0,0 +1,36 @@
+import std/[strutils, os, macros, terminal]
+
+template loadInputs*(): untyped =
+  const callPath = getProjectPath()
+  const example* {.inject.} = slurp(callPath / "example.txt").strip()
+  const input* {.inject.} = slurp(callPath / "input.txt").strip()
+
+template solveInput*(input: string, p1: untyped, p2: untyped): untyped =
+  assert partOne(input) == p1
+  assert partTwo(input) == p2
+
+macro solve*(arg: untyped): untyped =
+  arg.expectKind nnkStmtList
+  result = newStmtList()
+  for stmt in arg:
+    stmt.expectKind nnkCall
+    stmt[0].expectKind nnkIdent
+    if not (stmt[0].eqIdent("example") or stmt[0].eqIdent("input")):
+      error "Invalid input identifier: " & stmt[0].strVal
+    stmt[1].expectKind nnkStmtList
+    for inputs in stmt[1]:
+      inputs.expectKind nnkCall
+      inputs[0].expectKind nnkIdent
+      inputs[1].expectKind nnkStmtList
+      let
+        part = inputs[0]
+        puzzleInput = stmt[0]
+        output = inputs[1][0]
+        msg = newLit(part.repr & "|" & puzzleInput.repr)
+      result.add quote do:
+        let color =
+          if `part`(`puzzleInput`) == `output`: fgGreen
+          else: fgRed
+        stdout.styledWriteLine(color, `msg`, fgDefault, ": ", $`output`)
+
+loadInputs()

solutions/day04/solution.nim

@@ -1,7 +1,6 @@
-import std/[math, sets, sequtils, strutils]
+import std/[math, sets, sequtils, strutils, macros]
 
-const example* = slurp("example.txt").strip()
-const input* = slurp("input.txt").strip()
+import ../aoc
 
 type
   Card = object
@@ -44,12 +43,10 @@ proc partTwo*(input: string): int =
   return winners.sum()
 
 
-when isMainModule:
-  import std/unittest
-  suite "day 4":
-    test "part one":
-      check partOne(example) == 13
-      check partOne(input) == 22674
-    test "part two":
-      check partTwo(example) == 30
-      check partTwo(input) == 5747443
+solve:
+  example:
+    partOne: 13
+    partTwo: 30
+  input:
+    partOne: 22674
+    partTwo: 5747443