From 2806ed7d55266ececb197196af2fb84ae8c3cb35 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sat, 6 Dec 2025 18:29:49 +0100
Subject: [add]: Docker and prepare day4

---
 Dockerfile           | 23 +++++++++++++++++++++++
 Makefile             | 21 ++++++++-------------
 README.md            | 40 ++++++++++++++++++++--------------------
 docker-entrypoint.sh | 26 ++++++++++++++++++++++++++
 src/Day4.asm         | 25 +++++++++++++++++++++++++
 5 files changed, 102 insertions(+), 33 deletions(-)
 create mode 100644 Dockerfile
 create mode 100644 docker-entrypoint.sh
 create mode 100644 src/Day4.asm

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..ead2a68
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,23 @@
+FROM debian:bookworm-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        make \
+        nasm \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY Makefile ./
+COPY src ./src
+COPY input ./input
+COPY README.md LICENSE ./
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh \
+    && mkdir -p build
+
+ENTRYPOINT ["docker-entrypoint.sh"]
+CMD ["list"]
+
diff --git a/Makefile b/Makefile
index b3b2f73..9faa0fb 100644
--- a/Makefile
+++ b/Makefile
@@ -7,14 +7,12 @@ BUILD_DIR := build
 NASMFLAGS ?= -f elf64
 LDFLAGS ?= -m elf_x86_64
 
-DAYS := Day1 Day2 Day3
-ASM_SRCS := $(addprefix $(SRC_DIR)/,$(addsuffix .asm,$(DAYS)))
-OBJ_FILES := $(addprefix $(BUILD_DIR)/,$(addsuffix .o,$(DAYS)))
+DAYS := Day1 Day2 Day3 Day4  Day5  Day6 \
+		Day7 Day8 Day9 Day10 Day11 Day12
 BINARIES := $(addprefix $(BUILD_DIR)/,$(DAYS))
 
-.PHONY: all clean \
-	    day1 day2 day3 \
-		list run-day%
+.PHONY: all clean list
+.PHONY: day% run-day%
 
 all: $(BINARIES)
 
@@ -22,17 +20,14 @@ $(BUILD_DIR):
 	@mkdir -p $(BUILD_DIR)
 
 $(BUILD_DIR)/Day%.o: $(SRC_DIR)/Day%.asm | $(BUILD_DIR)
-	$(NASM) $(NASMFLAGS) $< -o $@
+	@$(NASM) $(NASMFLAGS) $< -o $@
 
 $(BUILD_DIR)/Day%: $(BUILD_DIR)/Day%.o
-	$(LD) $(LDFLAGS) -o $@ $<
-
-day1: $(BUILD_DIR)/Day1
-day2: $(BUILD_DIR)/Day2
-day3: $(BUILD_DIR)/Day3
+	@$(LD) $(LDFLAGS) -o $@ $<
 
+day%: $(BUILD_DIR)/Day%
 run-day%: $(BUILD_DIR)/Day%
-	./$(BUILD_DIR)/Day$*
+	@./$<
 
 list:
 	@printf "Available days:\n"
diff --git a/README.md b/README.md
index 8a84811..f2572bf 100644
--- a/README.md
+++ b/README.md
@@ -1,37 +1,37 @@
 # Advent of Code - 2025
-yes, i started late.
-yes, i wrote it in x86_64 assembly.
-no, there is no absolutely no good reason for this.
-no, i'm not okay.
+Yes, I started late.
+Yes, I wrote it in x86_64 assembly.
+No, there is no absolutely no good reason for this.
+No, I'm not okay.
 
 ### Why assembly?
-because i was really bored and i wanted more of an excuse to procrastinate.
+Because I was really bored and I wanted more of an excuse to procrastinate.
 
 also: **aura**.
 
-## Building
-```sh
-$ make day[1-12]
-# example:
-$ make day1
-$ make day2
-```
-
-## Running
+## Building & Running
 ```sh
 $ make run-day[1-12]
 # example:
 $ make run-day1
 $ make run-day2
 ```
-or manually, after building
+If you just want to build the binaries without running them do `make day[1-12]`.
 
+## Docker
+If you do not have `nasm`/`ld` locally, build the container:
+```sh
+$ docker build -t aoc-2025 .
+```
+Run a specific puzzle directly
+```sh
+$ docker run aoc-2025 day4
+$ docker run aoc-2025 day5
+```
+Running with no arguments (`docker run aoc-2025`) will list the available targets. If you only want to build a binary, use `build-day[1-12]`.
+When you're done, delete the image:
 ```sh
-$ ./build/day[1-12]
-# example
-$ ./build/day1
-$ ./build/day2
-$ ./build/day3
+$ docker rmi aoc-2025
 ```
 
 ## License
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
new file mode 100644
index 0000000..1344e85
--- /dev/null
+++ b/docker-entrypoint.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+set -eu
+
+if [ "$#" -eq 0 ]; then
+    set -- list
+fi
+
+target="$1"
+shift
+
+case "$target" in
+    day[0-9]*)
+        target="run-$target"
+        ;;
+    build-day[0-9]*)
+        target="${target#build-}"
+        ;;
+    run-day[0-9]*)
+        ;;
+    *)
+        # allow raw make targets
+        ;;
+esac
+
+exec make "$target" "$@"
+
diff --git a/src/Day4.asm b/src/Day4.asm
new file mode 100644
index 0000000..475f2ef
--- /dev/null
+++ b/src/Day4.asm
@@ -0,0 +1,25 @@
+bits 64
+default rel
+
+global _start
+
+%define SYS_EXIT  60
+%define SYS_WRITE 1
+
+%define STDOUT 1
+
+section .data
+    message db "Hello Day 4!", 0xA
+    length  equ $-message
+
+section .text
+_start:
+    mov rax, SYS_WRITE
+    mov rdi, STDOUT
+    mov rsi, message
+    mov rdx, length
+    syscall
+
+    mov rax, SYS_EXIT
+    xor rdi, rdi
+    syscall
-- 
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