1 files changed, 104 insertions, 0 deletions

diff --git a/2023/flake.nix b/2023/flake.nix
new file mode 100644
index 0000000..6f6ad62
--- /dev/null
+++ b/2023/flake.nix
@@ -0,0 +1,104 @@
+{
+  description = "Environment for the Advent of Code 2023, solved in C++";
+
+  inputs.devshell.url = "github:numtide/devshell";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  inputs.flake-compat = {
+    url = "github:edolstra/flake-compat";
+    flake = false;
+  };
+
+  outputs = { self, flake-utils, devshell, nixpkgs, ... }:
+    flake-utils.lib.eachDefaultSystem (system: {
+      devShells.default = let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ devshell.overlays.default ];
+        };
+      in pkgs.devshell.mkShell {
+
+        devshell = {
+          motd = ''
+            {bold}{3}🎄 Advent of Code 2023 🎄{reset}
+            $(for CMD in g++ make gdb clangd ; do
+              "$CMD" --version | head -n1
+            done)
+            $(type -p menu &>/dev/null && menu)
+          '';
+          interactive = {
+            prompt.text = ''
+              export PS1="\n> "
+            '';
+          };
+        };
+
+        packages = with pkgs; [
+          gcc gnumake gdb clang-tools bear
+        ];
+
+        #env = [
+        #  { name = "ENV"; value = "val"; }
+        #];
+
+        commands = [
+          {
+            category = "aoc";
+            name = "start";
+            help = "Deploy directory structure for day $1";
+            command = ''
+              BASE="$(printf %02d $1)"
+              [ -d "$BASE" ] && echo "Existing directory '$BASE'" && exit 1
+              mkdir -p "$BASE" && cd $_
+              mkdir -p src resources
+
+              cat << EOF >> src/part1.cpp
+              #include <iostream>
+              #include <fstream>
+
+              int main(void)
+              {
+                  int answer{};
+
+                  std::ifstream input{ "resources/input_small.txt" };
+                  if (input.is_open())
+                  {
+                      std::string line;
+                      while (not std::getline(input,line).eof())
+                      {
+                          /* ... */
+                      }
+                  }
+                  input.close();
+
+                  /* ... */
+
+                  std::cout << answer << std::endl;
+                  return 0;
+              }
+              EOF
+              cp src/part1.cpp src/part2.cpp
+
+              cat << EOF >> Makefile
+              CXXFLAGS := -std=c++17
+              EXE := part1 part2
+
+              .PHONY: all clean
+
+              all: \$(EXE)
+
+              %.o: %.cpp
+                \$(CXX) -c \$(CXXFLAGS) $< -o $@
+
+              clean:
+                rm -rf \$(EXE) src/*.o
+
+              %: src/%.o
+                \$(CXX) $^ -o $@
+              EOF
+            '';
+          }
+        ];
+      };
+  });
+}