From f6d8a80361a2fba1ce069101ff52efdcc982be1d Mon Sep 17 00:00:00 2001
From: Tanner Linsley <tannerlinsley@gmail.com>
Date: Thu, 18 Feb 2021 10:42:55 -0700
Subject: [PATCH] feat: support custom sorter

---
 README.md              | 26 ++++++++++++++++++++++++++
 src/__tests__/index.ts | 12 ++++++++++++
 src/index.ts           | 11 ++++++++---
 3 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 612197f..14f6eae 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,7 @@ Feedback welcome!
   - [threshold: `number`](#threshold-number)
   - [keepDiacritics: `boolean`](#keepdiacritics-boolean)
   - [baseSort: `function(itemA, itemB): -1 | 0 | 1`](#basesort-functionitema-itemb--1--0--1)
+  - [sorter: `function(rankedItems): rankedItems`](#sorter-functionrankeditems-rankeditems)
 - [Recipes](#recipes)
   - [Match PascalCase, camelCase, snake_case, or kebab-case as words](#match-pascalcase-camelcase-snake_case-or-kebab-case-as-words)
   - [Match many words across multiple fields (table filtering)](#match-many-words-across-multiple-fields-table-filtering)
@@ -344,6 +345,31 @@ matchSorter(list, 'apple', {baseSort: (a, b) => (a.index < b.index ? -1 : 1)})
 // ['C apple', 'B apple', 'A apple']
 ```
 
+### sorter: `function(rankedItems): rankedItems`
+
+_Default:
+`matchedItems => matchedItems.sort((a, b) => sortRankedValues(a, b, baseSort))`_
+
+By default, match-sorter uses an internal `sortRankedValues` function to sort
+items after matching them.
+
+_You can customize the core sorting behavior by specifying a custom `sorter`
+function:_
+
+Disable sorting entirely:
+```javascript
+const list = ['appl', 'C apple', 'B apple', 'A apple', 'app', 'applebutter']
+matchSorter(list, 'apple', {sorter: rankedItems => rankedItems})
+// ['C apple', 'B apple', 'A apple', 'applebutter']
+```
+
+Return the unsorted rankedItems, but in reverse order:
+```javascript
+const list = ['appl', 'C apple', 'B apple', 'A apple', 'app', 'applebutter']
+matchSorter(list, 'apple', {sorter: rankedItems => [...rankedItems].reverse()})
+// ['applebutter', 'A apple', 'B apple', 'C apple']
+```
+
 ## Recipes
 
 ### Match PascalCase, camelCase, snake_case, or kebab-case as words
diff --git a/src/__tests__/index.ts b/src/__tests__/index.ts
index 5e73372..dd795dd 100644
--- a/src/__tests__/index.ts
+++ b/src/__tests__/index.ts
@@ -495,6 +495,18 @@ const tests: Record<string, TestCase> = {
     ],
     output: [{name: 'Jen_Smith'}, {name: 'Janice_Kurtis'}],
   },
+  'support a custom sortRankedValues function to overriding all sorting functionality': {
+    input: [
+      ['appl', 'C apple', 'B apple', 'A apple', 'app', 'applebutter'],
+      '',
+      {
+        sorter: rankedItems => {
+          return [...rankedItems].reverse()
+        },
+      },
+    ],
+    output: ['applebutter', 'app', 'A apple', 'B apple', 'C apple', 'appl'],
+  },
 }
 
 for (const [
diff --git a/src/index.ts b/src/index.ts
index 086983e..b5e4dbb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -31,6 +31,10 @@ interface BaseSorter<ItemType> {
   (a: RankedItem<ItemType>, b: RankedItem<ItemType>): number
 }
 
+interface Sorter<ItemType> {
+  (matchItems: Array<RankedItem<ItemType>>): Array<RankedItem<ItemType>>
+}
+
 interface KeyAttributesOptions<ItemType> {
   key?: string | ValueGetterKey<ItemType>
   threshold?: Ranking
@@ -48,6 +52,7 @@ interface MatchSorterOptions<ItemType = unknown> {
   threshold?: Ranking
   baseSort?: BaseSorter<ItemType>
   keepDiacritics?: boolean
+  sorter?: Sorter<ItemType>
 }
 type IndexableByString = Record<string, unknown>
 
@@ -85,11 +90,11 @@ function matchSorter<ItemType = string>(
     keys,
     threshold = rankings.MATCHES,
     baseSort = defaultBaseSortFn,
+    sorter = matchedItems =>
+      matchedItems.sort((a, b) => sortRankedValues(a, b, baseSort)),
   } = options
   const matchedItems = items.reduce(reduceItemsToRanked, [])
-  return matchedItems
-    .sort((a, b) => sortRankedValues(a, b, baseSort))
-    .map(({item}) => item)
+  return sorter(matchedItems).map(({item}) => item)
 
   function reduceItemsToRanked(
     matches: Array<RankedItem<ItemType>>,