From d068e74f8f9461039f876a0a08ffd8c6105d5383 Mon Sep 17 00:00:00 2001
From: bkmartinjr <bruce@chanzuckerberg.com>
Date: Mon, 8 Feb 2021 16:17:35 -0800
Subject: [PATCH] add geneset: rename action

---
 client/src/reducers/genesets.js | 34 +++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/client/src/reducers/genesets.js b/client/src/reducers/genesets.js
index 87750dd9..bd651962 100644
--- a/client/src/reducers/genesets.js
+++ b/client/src/reducers/genesets.js
@@ -126,6 +126,40 @@ const GeneSets = (
       };
     }
 
+    /**
+     * Rename the gene set, preserving its order in the geneset collection.
+     *
+     * {
+     *    type: "geneset: rename",
+     *    name: string, // gene set current (previous) name
+     *    newName: string, // the new gene set name
+     * }
+     */
+    case "geneset: rename": {
+      const { name, newName } = action;
+      if (!state.genesets.has(name))
+        throw new Error("geneset: rename -- name does not exist.");
+      if (
+        typeof newName !== "string" ||
+        !newName.length ||
+        state.genesets.has(newName)
+      )
+        throw new Error(
+          "geneset: rename -- new name must be unique, non-null string."
+        );
+
+      // clone the map, preserving current insert order, but mapping name->newName.
+      const genesets = new Map();
+      for (const [gsName, gsGenes] of state.genesets) {
+        if (gsName === name) genesets.set(newName, gsGenes);
+        else genesets.set(gsName, gsGenes);
+      }
+      return {
+        ...state,
+        genesets,
+      };
+    }
+
     default:
       return state;
   }