correct calculation of ppppp-record purpose range

lib/index.js

@@ -3,6 +3,7 @@ const Obz = require('obz')
 
 /**
  * @typedef {ReturnType<import('ppppp-db').init>} PPPPPDB
+ * @typedef {ReturnType<import('ppppp-record').init>} PPPPPRecord
  * @typedef {import('ppppp-db').RecPresent} RecPresent
  * @typedef {import('ppppp-db').Tangle} Tangle
  * @typedef {ReturnType<PPPPPDB['getTangle']>} DBTangle
@@ -33,6 +34,14 @@ function assertDBExists(peer) {
   if (!peer.db) throw new Error('goals plugin requires ppppp-db plugin')
 }
 
+/**
+ * @param {{ record: PPPPPRecord | null }} peer
+ * @returns {asserts peer is { record: PPPPPRecord }}
+ */
+function assertRecordExists(peer) {
+  if (!peer.record) throw new Error('goals plugin requires ppppp-record plugin')
+}
+
 /**
  * @implements {Goal}
  */
@@ -102,7 +111,7 @@ class GoalImpl {
 }
 
 /**
- * @param {{ db: PPPPPDB | null }} peer
+ * @param {{ db: PPPPPDB | null, record: PPPPPRecord | null }} peer
  * @param {unknown} config
  */
 function initGoals(peer, config) {
@@ -127,8 +136,11 @@ function initGoals(peer, config) {
         return EMPTY_RANGE
       case 'all':
       case 'set':
-      case 'record':
         return [0, maxDepth]
+      case 'record':
+        assertRecordExists(peer)
+        const minDepth = peer.record.getMinRequiredDepth(goal.id)
+        return [minDepth, maxDepth]
       case 'newest':
         const start = Math.max(0, maxDepth - goal.count + 1)
         return [start, maxDepth]

package.json

@@ -33,6 +33,7 @@
     "ppppp-db": "github:staltz/ppppp-db",
     "ppppp-caps": "github:staltz/ppppp-caps",
     "ppppp-keypair": "github:staltz/ppppp-keypair",
+    "ppppp-record": "github:staltz/ppppp-record",
     "prettier": "^2.6.2",
     "pretty-quick": "^3.1.3",
     "rimraf": "^4.4.0",