feat: discogs description and bugfixes

src/sh/mb.sh

@@ -6,7 +6,7 @@ __mb_artist_cache_or_fetch() {
     __api_mb_get_artist "$1" | cache_put_artist_mb "$1"
     mbartist="$(cache_get_artist_mb "$1")"
   fi
-  echo "$mbartist"
+  printf "%s" "$mbartist"
 }
 
 # Get MusicBrainz json for artist
@@ -29,7 +29,8 @@ mb_artist_wikidata() {
     __api_wikidata_get_sitelinks "$wikidataid" | cache_put_artist_wikidata "$1"
     wikidata=$(cache_get_artist_wikidata "$1")
   fi
-  echo "$wikidata"
+  [ ! "$wikidata" ] || [ "$wikidata" != "null" ] || return
+  printf "%s" "$wikidata"
 }
 
 # Get Wikipedia (English) summary json for artist
@@ -45,12 +46,31 @@ mb_artist_enwikipedia() {
     # For obvious reasons it is recommended to link to wikidata only. So, we
     # take the second route.
     wikidata=$(mb_artist_wikidata "$1" || true)
-    wikiid=$(echo "$wikidata" |
+    wikiid=$(printf "%s" "$wikidata" |
       $JQ -r '.enwiki.url' |
       awk -F "/" '{print $NF}')
-    [ ! "$wikiid" ] || [ "$wikiid" != "null" ] || return
+    [ ! "$wikiid" ] && return || [ "$wikiid" = "null" ] && return
     __api_wikipedia_en_get_summary "$wikiid" | cache_put_artist_enwikipedia "$1"
     enwiki="$(cache_get_artist_enwikipedia "$1")"
   fi
-  [ ! "$enwiki" ] || [ "$enwiki" != "null" ] || return
+  [ ! "$enwiki" ] && return || [ "$enwiki" = "null" ] && return
+  printf "%s" "$enwiki"
+}
+
+# Get Discogs json for artist
+# @argument $1: MusicBrainz Artist ID
+mb_artist_discogs() {
+  discogs="$(cache_get_artist_discogs "$1" || true)"
+  if [ ! "$discogs" ] || [ "$discogs" = "null" ]; then
+    discogsid=$(mb_artist "$1" |
+      $JQ -r '.relations |
+      map(select(.type=="discogs")) |
+      .[0].url.resource' |
+      awk -F "/" '{print $NF}')
+    [ ! "$discogsid" ] && return || [ "$discogsid" = "null" ] && return
+    __api_discogs_get_artist "$discogsid" | cache_put_artist_discogs "$1"
+    discogs="$(cache_get_artist_discogs "$1" || true)"
+  fi
+  [ ! "$discogs" ] && return || [ "$discogs" = "null" ] && return
+  printf "%s" "$discogs"
 }