Improve autocomplete behaviour

.eslintrc

@@ -78,18 +78,26 @@
     /** react **/
 
     // bind or arrow function in props causes performance issues
-    "react/jsx-no-bind": ["error"],
+    "react/jsx-no-bind": ["error", {
+      "ignoreRefs": true
+    }],
     "react/jsx-key": ["error"],
     "react/prefer-stateless-function": ["warn"],
-    "react/sort-comp": ["warn"],
 
     /** flowtype **/
-    "flowtype/require-parameter-type": 1,
+    "flowtype/require-parameter-type": [
+      1,
+      {
+        "excludeArrowFunctions": true
+      }
+    ],
+    "flowtype/define-flow-type": 1,
     "flowtype/require-return-type": [
       1,
       "always",
       {
-        "annotateUndefined": "never"
+        "annotateUndefined": "never",
+        "excludeArrowFunctions": true
       }
     ],
     "flowtype/space-after-type-colon": [

code_style.md

@@ -158,5 +158,11 @@ React
   <Foo onClick={this.doStuff}> // Better
   <Foo onClick={this.onFooClick}> // Best, if onFooClick would do anything other than directly calling doStuff
   ```
+
+  Not doing so is acceptable in a single case; in function-refs:
+
+  ```jsx
+  <Foo ref={(self) => this.component = self}>
+  ```
 - Think about whether your component really needs state: are you duplicating
   information in component state that could be derived from the model?

package.json

@@ -62,8 +62,8 @@
     "babel-loader": "^5.4.0",
     "babel-polyfill": "^6.5.0",
     "eslint": "^2.13.1",
-    "eslint-plugin-flowtype": "^2.3.0",
-    "eslint-plugin-react": "^5.2.2",
+    "eslint-plugin-flowtype": "^2.17.0",
+    "eslint-plugin-react": "^6.2.1",
     "expect": "^1.16.0",
     "json-loader": "^0.5.3",
     "karma": "^0.13.22",

src/RichText.js

@@ -15,6 +15,7 @@ import {
 import * as sdk from  './index';
 import * as emojione from 'emojione';
 import {stateToHTML} from 'draft-js-export-html';
+import {SelectionRange} from "./autocomplete/Autocompleter";
 
 const MARKDOWN_REGEX = {
     LINK: /(?:\[([^\]]+)\]\(([^\)]+)\))|\<(\w+:\/\/[^\>]+)\>/g,
@@ -203,7 +204,7 @@ export function selectionStateToTextOffsets(selectionState: SelectionState,
     };
 }
 
-export function textOffsetsToSelectionState({start, end}: {start: number, end: number},
+export function textOffsetsToSelectionState({start, end}: SelectionRange,
                                             contentBlocks: Array<ContentBlock>): SelectionState {
     let selectionState = SelectionState.createEmpty();
 

src/SlashCommands.js

@@ -17,6 +17,8 @@ limitations under the License.
 var MatrixClientPeg = require("./MatrixClientPeg");
 var dis = require("./dispatcher");
 var Tinter = require("./Tinter");
+import sdk from './index';
+import Modal from './Modal';
 
 
 class Command {
@@ -56,6 +58,16 @@ var success = function(promise) {
 };
 
 var commands = {
+    ddg: new Command("ddg", "<query>", function(roomId, args) {
+        const ErrorDialog = sdk.getComponent('dialogs.ErrorDialog');
+        // TODO Don't explain this away, actually show a search UI here.
+        Modal.createDialog(ErrorDialog, {
+            title: "/ddg is not a command",
+            description: "To use it, just wait for autocomplete results to load and tab through them.",
+        });
+        return success();
+    }),
+
     // Change your nickname
     nick: new Command("nick", "<display_name>", function(room_id, args) {
         if (args) {

src/autocomplete/AutocompleteProvider.js

@@ -1,10 +1,10 @@
-import Q from 'q';
 import React from 'react';
+import type {Completion, SelectionRange} from './Autocompleter';
 
 export default class AutocompleteProvider {
     constructor(commandRegex?: RegExp, fuseOpts?: any) {
-        if(commandRegex) {
-            if(!commandRegex.global) {
+        if (commandRegex) {
+            if (!commandRegex.global) {
                 throw new Error('commandRegex must have global flag set');
             }
             this.commandRegex = commandRegex;
@@ -14,18 +14,23 @@ export default class AutocompleteProvider {
     /**
      * Of the matched commands in the query, returns the first that contains or is contained by the selection, or null.
      */
-    getCurrentCommand(query: string, selection: {start: number, end: number}): ?Array<string> {
-        if (this.commandRegex == null) {
+    getCurrentCommand(query: string, selection: {start: number, end: number}, force: boolean = false): ?string {
+        let commandRegex = this.commandRegex;
+
+        if (force && this.shouldForceComplete()) {
+            commandRegex = /[^\W]+/g;
+        }
+
+        if (commandRegex == null) {
             return null;
         }
 
-        this.commandRegex.lastIndex = 0;
+        commandRegex.lastIndex = 0;
 
         let match;
-        while ((match = this.commandRegex.exec(query)) != null) {
+        while ((match = commandRegex.exec(query)) != null) {
             let matchStart = match.index,
                 matchEnd = matchStart + match[0].length;
-
             if (selection.start <= matchEnd && selection.end >= matchStart) {
                 return {
                     command: match,
@@ -45,8 +50,8 @@ export default class AutocompleteProvider {
         };
     }
 
-    getCompletions(query: string, selection: {start: number, end: number}) {
-        return Q.when([]);
+    async getCompletions(query: string, selection: SelectionRange, force: boolean = false): Array<Completion> {
+        return [];
     }
 
     getName(): string {
@@ -57,4 +62,9 @@ export default class AutocompleteProvider {
         console.error('stub; should be implemented in subclasses');
         return null;
     }
+
+    // Whether we should provide completions even if triggered forcefully, without a sigil.
+    shouldForceComplete(): boolean {
+        return false;
+    }
 }

src/autocomplete/Autocompleter.js

@@ -1,22 +1,63 @@
+// @flow
+
+import type {Component} from 'react';
 import CommandProvider from './CommandProvider';
 import DuckDuckGoProvider from './DuckDuckGoProvider';
 import RoomProvider from './RoomProvider';
 import UserProvider from './UserProvider';
 import EmojiProvider from './EmojiProvider';
+import Q from 'q';
+
+export type SelectionRange = {
+    start: number,
+    end: number
+};
+
+export type Completion = {
+    completion: string,
+    component: ?Component,
+    range: SelectionRange,
+    command: ?string,
+};
 
 const PROVIDERS = [
     UserProvider,
-    CommandProvider,
-    DuckDuckGoProvider,
     RoomProvider,
     EmojiProvider,
+    CommandProvider,
+    DuckDuckGoProvider,
 ].map(completer => completer.getInstance());
 
-export function getCompletions(query: string, selection: {start: number, end: number}) {
-    return PROVIDERS.map(provider => {
-        return {
-            completions: provider.getCompletions(query, selection),
-            provider,
-        };
-    });
+// Providers will get rejected if they take longer than this.
+const PROVIDER_COMPLETION_TIMEOUT = 3000;
+
+export async function getCompletions(query: string, selection: SelectionRange, force: boolean = false): Array<Completion> {
+    /* Note: That this waits for all providers to return is *intentional*
+     otherwise, we run into a condition where new completions are displayed
+     while the user is interacting with the list, which makes it difficult
+     to predict whether an action will actually do what is intended
+
+     It ends up containing a list of Q promise states, which are objects with
+     state (== "fulfilled" || "rejected") and value. */
+    const completionsList = await Q.allSettled(
+        PROVIDERS.map(provider => {
+            return Q(provider.getCompletions(query, selection, force))
+                .timeout(PROVIDER_COMPLETION_TIMEOUT);
+        })
+    );
+
+    return completionsList
+        .filter(completion => completion.state === "fulfilled")
+        .map((completionsState, i) => {
+            return {
+                completions: completionsState.value,
+                provider: PROVIDERS[i],
+
+                /* the currently matched "command" the completer tried to complete
+                 * we pass this through so that Autocomplete can figure out when to
+                 * re-show itself once hidden.
+                 */
+                command: PROVIDERS[i].getCurrentCommand(query, selection, force),
+            };
+        });
 }

src/autocomplete/CommandProvider.js

@@ -1,6 +1,5 @@
 import React from 'react';
 import AutocompleteProvider from './AutocompleteProvider';
-import Q from 'q';
 import Fuse from 'fuse.js';
 import {TextualCompletion} from './Components';
 
@@ -23,7 +22,7 @@ const COMMANDS = [
     {
         command: '/invite',
         args: '<user-id>',
-        description: 'Invites user with given id to current room'
+        description: 'Invites user with given id to current room',
     },
     {
         command: '/join',
@@ -40,6 +39,11 @@ const COMMANDS = [
         args: '<display-name>',
         description: 'Changes your display nickname',
     },
+    {
+        command: '/ddg',
+        args: '<query>',
+        description: 'Searches DuckDuckGo for results',
+    }
 ];
 
 let COMMAND_RE = /(^\/\w*)/g;
@@ -54,7 +58,7 @@ export default class CommandProvider extends AutocompleteProvider {
         });
     }
 
-    getCompletions(query: string, selection: {start: number, end: number}) {
+    async getCompletions(query: string, selection: {start: number, end: number}) {
         let completions = [];
         let {command, range} = this.getCurrentCommand(query, selection);
         if (command) {
@@ -70,7 +74,7 @@ export default class CommandProvider extends AutocompleteProvider {
                 };
             });
         }
-        return Q.when(completions);
+        return completions;
     }
 
     getName() {

src/autocomplete/DuckDuckGoProvider.js

@@ -1,6 +1,5 @@
 import React from 'react';
 import AutocompleteProvider from './AutocompleteProvider';
-import Q from 'q';
 import 'whatwg-fetch';
 
 import {TextualCompletion} from './Components';
@@ -20,61 +19,59 @@ export default class DuckDuckGoProvider extends AutocompleteProvider {
          + `&format=json&no_redirect=1&no_html=1&t=${encodeURIComponent(REFERRER)}`;
     }
 
-    getCompletions(query: string, selection: {start: number, end: number}) {
+    async getCompletions(query: string, selection: {start: number, end: number}) {
         let {command, range} = this.getCurrentCommand(query, selection);
         if (!query || !command) {
-            return Q.when([]);
+            return [];
         }
 
-        return fetch(DuckDuckGoProvider.getQueryUri(command[1]), {
+        const response = await fetch(DuckDuckGoProvider.getQueryUri(command[1]), {
             method: 'GET',
-        })
-            .then(response => response.json())
-            .then(json => {
-                let results = json.Results.map(result => {
-                    return {
-                        completion: result.Text,
-                        component: (
-                            <TextualCompletion
-                                title={result.Text}
-                                description={result.Result} />
-                        ),
-                        range,
-                    };
-                });
-                if (json.Answer) {
-                    results.unshift({
-                        completion: json.Answer,
-                        component: (
-                            <TextualCompletion
-                                title={json.Answer}
-                                description={json.AnswerType} />
-                        ),
-                        range,
-                    });
-                }
-                if (json.RelatedTopics && json.RelatedTopics.length > 0) {
-                    results.unshift({
-                        completion: json.RelatedTopics[0].Text,
-                        component: (
-                            <TextualCompletion
-                                title={json.RelatedTopics[0].Text} />
-                        ),
-                        range,
-                    });
-                }
-                if (json.AbstractText) {
-                    results.unshift({
-                        completion: json.AbstractText,
-                        component: (
-                            <TextualCompletion
-                                title={json.AbstractText} />
-                        ),
-                        range,
-                    });
-                }
-                return results;
+        });
+        const json = await response.json();
+        let results = json.Results.map(result => {
+            return {
+                completion: result.Text,
+                component: (
+                    <TextualCompletion
+                        title={result.Text}
+                        description={result.Result} />
+                ),
+                range,
+            };
+        });
+        if (json.Answer) {
+            results.unshift({
+                completion: json.Answer,
+                component: (
+                    <TextualCompletion
+                        title={json.Answer}
+                        description={json.AnswerType} />
+                ),
+                range,
             });
+        }
+        if (json.RelatedTopics && json.RelatedTopics.length > 0) {
+            results.unshift({
+                completion: json.RelatedTopics[0].Text,
+                component: (
+                    <TextualCompletion
+                        title={json.RelatedTopics[0].Text} />
+                ),
+                range,
+            });
+        }
+        if (json.AbstractText) {
+            results.unshift({
+                completion: json.AbstractText,
+                component: (
+                    <TextualCompletion
+                        title={json.AbstractText} />
+                ),
+                range,
+            });
+        }
+        return results;
     }
 
     getName() {