initial version of autocomplete

src/autocomplete/AutocompleteProvider.js

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+export default class AutocompleteProvider {
+
+}

src/autocomplete/Autocompleter.js

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+import CommandProvider from './CommandProvider';
+
+const COMPLETERS = [CommandProvider].map(completer => new completer());
+
+export function getCompletions(query: String) {
+    return COMPLETERS.map(completer => completer.getCompletions(query));
+}

src/autocomplete/CommandProvider.js

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+import AutocompleteProvider from './AutocompleteProvider';
+import Q from 'q';
+import Fuse from 'fuse.js';
+
+const COMMANDS = [
+    {
+        command: '/me',
+        args: '<message>',
+        description: 'Displays action'
+    },
+    {
+        command: '/ban',
+        args: '<user-id> [reason]',
+        description: 'Bans user with given id'
+    },
+    {
+        command: '/deop'
+    },
+    {
+        command: '/encrypt'
+    },
+    {
+        command: '/invite'
+    },
+    {
+        command: '/join',
+        args: '<room-alias>',
+        description: 'Joins room with given alias'
+    },
+    {
+        command: '/kick',
+        args: '<user-id> [reason]',
+        description: 'Kicks user with given id'
+    },
+    {
+        command: '/nick',
+        args: '<display-name>',
+        description: 'Changes your display nickname'
+    }
+];
+
+export default class CommandProvider extends AutocompleteProvider {
+    constructor() {
+        super();
+        this.fuse = new Fuse(COMMANDS, {
+           keys: ['command', 'args', 'description']
+        });
+    }
+
+    getCompletions(query: String) {
+        let completions = [];
+        const matches = query.match(/(^\/\w+)/);
+        if(!!matches) {
+            const command = matches[0];
+            completions = this.fuse.search(command).map(result => {
+                return {
+                    title: result.command,
+                    subtitle: result.args,
+                    description: result.description
+                };
+            });
+        }
+        return Q.when(completions);
+    }
+}