[add]: Docker and prepare day4

5 files changed, 102 insertions, 33 deletions

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