diff --git a/app/crawler/main.sh b/app/crawler/main.sh
index 46f5f68..7a0243f 100644
--- a/app/crawler/main.sh
+++ b/app/crawler/main.sh
@@ -1,122 +1,122 @@
 #! /bin/bash
 
 main() {
-   config
-   for id in $(ids); do
-      crawl "$id"
-   done
-   for id in $(ids); do
-      rewrite "$id"
-   done
+	config
+	for id in $(ids); do
+		crawl "$id"
+	done
+	for id in $(ids); do
+		rewrite "$id"
+	done
 }
 
 config() {
-   set -o pipefail
-   set -e
-   export CACHE="${CACHE:-"$(mktemp -d)"}"
-   mkdir -p "$CACHE"
-   export CACHE_DURATION=$((60*50))
-   export NOTES_ADDR="${NOTES_ADDR:-"http://localhost:3004"}"
-   export GITLAB_PAT="$GITLAB_PAT"
-   source ./gitlab.sh
-   source ./cache.sh
-   source ./notes.sh
+	set -o pipefail
+	set -e
+	export CACHE="${CACHE:-"$(mktemp -d)"}"
+	mkdir -p "$CACHE"
+	export CACHE_DURATION=$((60*50))
+	export NOTES_ADDR="${NOTES_ADDR:-"http://localhost:3004"}"
+	export GITLAB_PAT="$GITLAB_PAT"
+	source ./gitlab.sh
+	source ./cache.sh
+	source ./notes.sh
 }
 
 log() {
-   echo "$(echo "$(date +%H:%M:%S)> $*" | tr '\n' ' ')" >&2
+	echo "$(echo "$(date +%H:%M:%S)> $*" | tr '\n' ' ')" >&2
 }
 
 ids() {
-   notes ids
+	notes ids
 }
 
 crawl() {
-   local cache_key="crawled $*"
+	local cache_key="crawled $*"
 	# TODO
-   if false && cache get "$cache_key"; then
-      return
-   fi
-   _crawl "$@" | cache put "$cache_key"
+	if false && cache get "$cache_key"; then
+		return
+	fi
+	_crawl "$@" | cache put "$cache_key"
 }
 
 _crawl() {
-   log "crawling $*"
-   local id="$1"
-   local content="$(notes get "$id")"
+	log "crawling $*"
+	local id="$1"
+	local content="$(notes get "$id")"
 	local json="$(
 		printf '{"content": %s, "id": "%s"}' \
 			"$(echo "$content" | jq -Rs)" \
 			"$id"
 	)"
-   if ! is_crawlable "$content"; then
-      log "not crawlable: '${content:0:20}'..."
-      return 0
-   fi
-   local crawlable_source="$(extract_crawlable_source "$content")"
-   for backend in gitlab; do
-      if $backend is "$crawlable_source"; then
-         crawl_with $backend "$json"
-         return $?
-      fi
-   done
-   log "unknown backend for $crawlable_source"
-   return 1
+	if ! is_crawlable "$content"; then
+		log "not crawlable: '${content:0:20}'..."
+		return 0
+	fi
+	local crawlable_source="$(extract_crawlable_source "$content")"
+	for backend in gitlab; do
+		if $backend is "$crawlable_source"; then
+			crawl_with $backend "$json"
+			return $?
+		fi
+	done
+	log "unknown backend for $crawlable_source"
+	return 1
 }
 
 extract_crawlable_source() {
-   echo "$*" | head -n 1 | awk '{print $NF}' | sed 's/^<//' | sed 's/>$//'
+	echo "$*" | head -n 1 | awk '{print $NF}' | sed 's/^<//' | sed 's/>$//'
 }
 
 crawl_with() {
-   local backend="$1"
-   local json="$2"
+	local backend="$1"
+	local json="$2"
 
-   local content="$(echo "$json" | jq -r .content)"
-   local crawlable_source="$(extract_crawlable_source "$content")"
+	local content="$(echo "$json" | jq -r .content)"
+	local crawlable_source="$(extract_crawlable_source "$content")"
 
-   local expanded=($($backend expand "$crawlable_source"))
-   log expand $crawlable_source:
+	local expanded=($($backend expand "$crawlable_source"))
+	log expand $crawlable_source:
 	one() {
 		local i="$1"
-      export TITLE="$(
+		export TITLE="$(
 			echo "$i" | base64 --decode
 		)"
-      export CONTENT="$(
+		export CONTENT="$(
 			$backend get "$crawlable_source" "$i"
 		)"
-      export ID="$(
+		export ID="$(
 			echo "$crawlable_source/$TITLE" | base64 | md5sum | awk '{print $1}'
 		)"
-      export PID="$(
+		export PID="$(
 			echo $json | jq -r .id
 		)"
-      log "   $PID/$ID ($TITLE): ${#CONTENT}"
-      push_crawled "$PID/$ID" "$TITLE" "$CONTENT"
+		log "	$PID/$ID ($TITLE): ${#CONTENT}"
+		push_crawled "$PID/$ID" "$TITLE" "$CONTENT"
 	}
-   for i in $(seq 1 $(("${#expanded[@]}"-1))); do
+	for i in $(seq 1 $(("${#expanded[@]}"-1))); do
 		one "${expanded[i]}"
-   done
+	done
 }
 
 push_crawled() {
-   notes put "$@"
+	notes put "$@"
 }
 
 is_crawlable() {
-   local crawlable_source="$(extract_crawlable_source "$*")"
-   # https://unix.stackexchange.com/questions/181254/how-to-use-grep-and-cut-in-script-to-obtain-website-urls-from-an-html-file
-   local url_pattern="(http|https)://[a-zA-Z0-9./?=_%:-]*"
-   echo "$crawlable_source" | grep -q -E "^[ ]*$url_pattern[ ]*$"
+	local crawlable_source="$(extract_crawlable_source "$*")"
+	# https://unix.stackexchange.com/questions/181254/how-to-use-grep-and-cut-in-script-to-obtain-website-urls-from-an-html-file
+	local url_pattern="(http|https)://[a-zA-Z0-9./?=_%:-]*"
+	echo "$crawlable_source" | grep -q -E "^[ ]*$url_pattern[ ]*$"
 }
 
 rewrite() {
-   log not impl: rewrite "#abc-def" to "#h-abc-def"
-   log not impl: rewrite "./asdf" to "./zyxw" or "absolute.com/asdf"
-   log not impl rewrite, change images
-   return 1
+	log not impl: rewrite "#abc-def" to "#h-abc-def"
+	log not impl: rewrite "./asdf" to "./zyxw" or "absolute.com/asdf"
+	log not impl rewrite, change images
+	return 1
 }
 
 if [ "$0" == "$BASH_SOURCE" ]; then
-   main "$@"
+	main "$@"
 fi