2 files changed, 67 insertions(+), 1 deletions(-)

M .gitignore
A run

@@ 1,4 1,8 @@
 *.cmo
 *.cmi
 
-a.out
+*.out
+*.in
+
+# contains the session cookie needed for input file download
+.cookie

@@ 0,0 1,62 @@
+#!/bin/sh -eu
+
+source .cookie
+
+usage () {
+	printf "USAGE: ./run [day_number]\n"
+	printf "If day number is provided, build and run the task for that day.\n"
+	printf "Run all implemented tasks otherwise\n"
+}
+
+
+die () {
+	printf "error: %s\n" "$1"
+	usage
+	exit 1
+}
+
+day () {
+	test -f "day_$1.in" || curl "https://adventofcode.com/2020/day/$1/input" \
+		-H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0' \
+		-H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' \
+		-H 'Accept-Language: en-US,en;q=0.5' \
+		--compressed \
+		-H 'DNT: 1' \
+		-H 'Connection: keep-alive' \
+		-H "Cookie: session=${SESSION_COOKIE}" \
+		-H 'Upgrade-Insecure-Requests: 1' \
+		-H 'Cache-Control: max-age=0' \
+		-H 'TE: Trailers' > "day_$1.in"
+
+	ocamlc "day_$1.ml" -o "day_$1"
+	./"day_$1"
+
+	printf "Day $1 task 1:\n"
+	cat "day_$1_1.out"
+
+	printf "Day $1 task 2:\n"
+	cat "day_$1_2.out"
+}
+
+if [ $# = 0 ]
+then
+	for f in day_*.ml
+	do
+		day $(basename "$f" .ml | cut -d _ -f 2)
+		printf "\n"
+	done
+	exit 0
+fi
+
+case "$1" in
+	*[[:digit:]])
+		test -f "day_$1.ml" || die "No program source for day $1"
+		day $1
+		;;
+	-u|-h|--usage|--help)
+		usage
+		;;
+	*)
+		die "$1 is not a day number"
+		;;
+esac