Tracker: move "IssueStatus" enum into model (#1449)

Signed-off-by: Sergei Ogorelkov <sergei.ogorelkov@xored.com>

plugins/tracker/src/utils.ts

@@ -0,0 +1,44 @@
+//
+// Copyright © 2022 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import { LexoRank, LexoDecimal, LexoNumeralSystem36 } from 'lexorank'
+import LexoRankBucket from 'lexorank/lib/lexoRank/lexoRankBucket'
+
+/**
+ * @public
+ */
+export const genRanks = (count: number): Generator<string, void, unknown> =>
+  (function * () {
+    const sys = new LexoNumeralSystem36()
+    const base = 36
+    const max = base ** 6
+    const gap = LexoDecimal.parse(Math.trunc(max / (count + 2)).toString(base), sys)
+    let cur = LexoDecimal.parse('0', sys)
+
+    for (let i = 0; i < count; i++) {
+      cur = cur.add(gap)
+      yield new LexoRank(LexoRankBucket.BUCKET_0, cur).toString()
+    }
+  })()
+
+/**
+ * @public
+ */
+export const calcRank = (prev?: { rank: string }, next?: { rank: string }): string => {
+  const a = prev?.rank !== undefined ? LexoRank.parse(prev.rank) : LexoRank.min()
+  const b = next?.rank !== undefined ? LexoRank.parse(next.rank) : LexoRank.max()
+
+  return a.between(b).toString()
+}