feat(shell-api): make db/coll autocompletions case-insensitive MONGOSH-847 (#1128)

Author: addaleax

packages/shell-api/src/integration.spec.ts

@@ -2146,8 +2146,10 @@ describe('Shell API (integration)', function() {
         expect(params.connectionInfo().is_localhost).to.equal(true);
         expect(await database._getCollectionNames()).to.deep.equal(['docs']);
         expect(await params.getCollectionCompletionsForCurrentDb('d')).to.deep.equal(['docs']);
+        expect(await params.getCollectionCompletionsForCurrentDb('D')).to.deep.equal(['docs']);
         expect(await params.getCollectionCompletionsForCurrentDb('e')).to.deep.equal([]);
         expect(await params.getDatabaseCompletions('test-')).to.deep.equal([database.getName()]);
+        expect(await params.getDatabaseCompletions('TEST-')).to.deep.equal([database.getName()]);
       });
     });
   });

packages/shell-api/src/shell-instance-state.ts

@@ -342,7 +342,8 @@ export default class ShellInstanceState {
       getCollectionCompletionsForCurrentDb: async(collName: string): Promise<string[]> => {
         try {
           const collectionNames = await this.currentDb._getCollectionNamesForCompletion();
-          return collectionNames.filter((name) => name.startsWith(collName));
+          return collectionNames.filter((name) =>
+            name.toLowerCase().startsWith(collName.toLowerCase()));
         } catch (err) {
           if (
             err.code === ShellApiErrors.NotConnected ||
@@ -356,7 +357,8 @@ export default class ShellInstanceState {
       getDatabaseCompletions: async(dbName: string): Promise<string[]> => {
         try {
           const dbNames = await this.currentDb._mongo._getDatabaseNamesForCompletion();
-          return dbNames.filter((name) => name.startsWith(dbName));
+          return dbNames.filter((name) =>
+            name.toLowerCase().startsWith(dbName.toLowerCase()));
         } catch (err) {
           if (
             err.code === ShellApiErrors.NotConnected ||