Support COMMAND DOCS

packages/client/lib/commands/COMMAND_DOCS.spec.ts

@@ -0,0 +1,30 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { transformArguments } from './COMMAND_DOCS';
+
+describe('COMMAND DOCS', () => {
+    testUtils.isVersionGreaterThanHook([7, 0]);
+    
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('SORT'),
+            ['COMMAND', 'DOCS', 'SORT']
+        );
+    });
+
+    testUtils.testWithClient('client.commandDocs', async client => {
+        assert.deepEqual(
+            await client.commandDocs('sort'),
+            [[
+                'sort', 
+                {
+                    summary: 'Sort the elements in a list, set or sorted set',
+                    since: '1.0.0',
+                    group: 'generic',
+                    complexity: 'O(N+M*log(M)) where N is the number of elements in the list or set to sort, and M the number of returned elements. When the elements are not sorted, complexity is O(N).',
+                    history: null
+                }
+            ]]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});

packages/client/lib/commands/COMMAND_DOCS.ts

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+import { RedisCommandArguments } from '.';
+import { pushVerdictArguments } from './generic-transformers';
+
+export const IS_READ_ONLY = true;
+
+export function transformArguments(keys: string | Array<string>): RedisCommandArguments {
+    return pushVerdictArguments(['COMMAND', 'DOCS'], keys);
+}
+
+type CommandDocumentation = {
+    summary: string;
+    since: string;
+    group: string;
+    complexity: string;
+    history?: Array<string>;
+};
+
+type CommandDocsReply = Array<[CommandName: string, CommandDocumentation: CommandDocumentation]>;
+
+export function transformReply(rawReply: Array<any>): CommandDocsReply {
+    const replyArray:CommandDocsReply = []
+
+    for (let i = 0; i < rawReply.length; i++) {
+        
+        replyArray.push([
+            rawReply[i++], // The name of the command
+            {
+                summary: rawReply[i][1],
+                since: rawReply[i][3],
+                group: rawReply[i][5],
+                complexity: rawReply[i][7],
+                history: rawReply[i][8] == 'history' ? rawReply[i][9] : null
+            }
+        ]);
+    }
+
+    return replyArray;
+}