feat: add --year flag for download script

bin/download

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+set -e;
+
+if ! command -v 'aoc' &> /dev/null
+then
+    echo "command \`aoc\` not found. Try running \`cargo install aoc-cli\` to install it."
+    exit 1
+fi
+
+POSITIONAL=()
+while [[ $# -gt 0 ]]; do
+  key="$1"
+
+  case $key in
+    -y|--year)
+      year="$2"
+      shift
+      shift
+      ;;
+    *)
+      POSITIONAL+=("$1")
+      shift
+      ;;
+  esac
+done
+
+set -- "${POSITIONAL[@]}"
+
+if [ -z "$1" ]; then
+    >&2 echo "Argument is required for day."
+    exit 1
+fi
+
+day=$(echo "$1" | sed 's/^0*//');
+day_padded=$(printf %02d "$day");
+
+filename="$day_padded";
+input_path="src/inputs/$filename.txt";
+
+tmp_dir=$(mktemp -d);
+tmp_file_path="$tmp_dir/input";
+
+if [[ "$year" != "" ]]
+then
+aoc download --day "$day" --year "$year" --file "$tmp_file_path";
+else
+aoc download --day "$day" --file "$tmp_file_path";
+fi
+
+cat "$tmp_file_path" > "$input_path";
+echo "---"
+echo "🎄 Successfully wrote input to \"$input_path\"!"
+
+trap "exit 1"            HUP INT PIPE QUIT TERM
+trap 'rm -rf "$tmp_dir"' EXIT