1 files changed, 79 insertions, 0 deletions
diff --git a/bin/fetch_input b/bin/fetch_input
new file mode 100755
index 0000000..ec09328
--- /dev/null
+++ b/bin/fetch_input
@@ -0,0 +1,79 @@
+#!/bin/sh -eu
+# vim: sw=2 et
+
+COOKIES="${HOME}/.adventofcode.json"
+
+YEAR=${YEAR:-$(date +%Y)}
+DAY=${DAY:-$(TZ=EST date '+%d')}
+DEC=$(echo "${DAY}" | sed 's/^0//')
+
+MODE="wget"
+
+# https://stackoverflow.com/q/21919156/how-do-i-copy-cookies-from-chrome
+SESSION=$(jq < "${COOKIES}" '."session-cookie"')
+
+check_dependency_availability() {
+  local bin
+
+  for bin in 'elinks' \
+    'jq' \
+    'wget'
+  do
+    if ! which "${bin}" >/dev/null; then
+      echo "Missing dependency: ${bin}" >&2
+      exit 1
+    fi
+  done
+}
+
+concat() {
+  local part
+
+  for part in "$@"; do
+    printf '%s' "${part}"
+  done
+}
+
+authenticated_wget() {
+  wget \
+      --server-response \
+      --header "Cookie: session=${SESSION}" \
+      "${@}"
+}
+
+check_dependency_availability
+
+if [ "${MODE}" = 'wget' ]; then
+  cd "${YEAR}"
+  cd 'rust'
+  mkdir "day${DAY}" || :
+  cd "day${DAY}"
+
+  # https://stackoverflow.com/q/21919156/how-do-i-copy-cookies-from-chrome
+  SESSION=$(jq < "${COOKIES}" '."session-cookie"' | tr -d '"')
+
+  if [ -e "input" ]; then
+    echo 'Directory input already exists. Skipping.'
+  else
+    mkdir 'input'
+    authenticated_wget --output-document "input/page_${DEC}.html" \
+       "https://adventofcode.com/${YEAR}/day/${DEC}"
+    SETTINGS=$(authenticated_wget --output-document='-' \
+        "https://adventofcode.com/${YEAR}/settings")
+    USERNAME=$(echo "${SETTINGS}" |
+       sed -n 's#.*display_name.*checked.*<span>\(.*\)</span>.*#\1#p')
+    echo "Found username: ${USERNAME}"
+    authenticated_wget --output-document "input/${USERNAME}" \
+       "https://adventofcode.com/${YEAR}/day/${DEC}/input"
+    elinks -dump "./input/page_${DEC}.html" >"input/page_${DEC}.txt"
+    sed -n 's/^ \([^ ]\)/\1/p' <"input/page_${DEC}.txt" >"input/example.txt"
+  fi
+elif [ "${MODE}" = 'aocdl' ]; then
+  # One could possibly use the golang implemenation instead of wget:
+  # https://github.com/GreenLightning/advent-of-code-downloader
+  #
+  # It has more features, but it is always a hassle to install extra things.
+  #
+  # go get github.com/GreenLightning/advent-of-code-downloader/aocdl
+  ~/.go/bin/aocdl -output "{{.Year}}/rust/{{.Day}}"
+fi