5 files changed, 483 insertions, 0 deletions
diff --git a/src/console/completion/actions.ts b/src/console/completion/actions.ts
new file mode 100644
index 0000000..59d1a04
--- /dev/null
+++ b/src/console/completion/actions.ts
@@ -0,0 +1,76 @@
+import CompletionType from "../../shared/CompletionType";
+import Completions from "../Completions";
+
+export const INIT_COMPLETIONS = "reset.completions";
+export const SET_COMPLETION_SOURCE = "set.completion.source";
+export const SET_COMPLETIONS = "set.completions";
+export const COMPLETION_NEXT = "completion.next";
+export const COMPLETION_PREV = "completion.prev";
+
+export interface InitCompletionAction {
+  type: typeof INIT_COMPLETIONS;
+  completionTypes: CompletionType[];
+}
+
+export interface SetCompletionSourceAction {
+  type: typeof SET_COMPLETION_SOURCE;
+  completionSource: string;
+}
+
+export interface SetCompletionsAction {
+  type: typeof SET_COMPLETIONS;
+  completions: Completions;
+}
+
+export interface CompletionNextAction {
+  type: typeof COMPLETION_NEXT;
+}
+
+export interface CompletionPrevAction {
+  type: typeof COMPLETION_PREV;
+}
+
+export type CompletionAction =
+  | InitCompletionAction
+  | SetCompletionSourceAction
+  | SetCompletionsAction
+  | CompletionNextAction
+  | CompletionPrevAction;
+
+export const initCompletion = (
+  completionTypes: CompletionType[]
+): InitCompletionAction => {
+  return {
+    type: INIT_COMPLETIONS,
+    completionTypes,
+  };
+};
+export const setCompletionSource = (
+  query: string
+): SetCompletionSourceAction => {
+  return {
+    type: SET_COMPLETION_SOURCE,
+    completionSource: query,
+  };
+};
+
+export const setCompletions = (
+  completions: Completions
+): SetCompletionsAction => {
+  return {
+    type: SET_COMPLETIONS,
+    completions,
+  };
+};
+
+export const selectNext = (): CompletionNextAction => {
+  return {
+    type: COMPLETION_NEXT,
+  };
+};
+
+export const selectPrev = (): CompletionPrevAction => {
+  return {
+    type: COMPLETION_PREV,
+  };
+};
diff --git a/src/console/completion/context.ts b/src/console/completion/context.ts
new file mode 100644
index 0000000..2fafcf8
--- /dev/null
+++ b/src/console/completion/context.ts
@@ -0,0 +1,9 @@
+import React from "react";
+import { State, defaultState } from "./reducer";
+import { CompletionAction } from "./actions";
+
+export const CompletionStateContext = React.createContext<State>(defaultState);
+
+export const CompletionDispatchContext = React.createContext<
+  (action: CompletionAction) => void
+>(() => {});
diff --git a/src/console/completion/hooks.ts b/src/console/completion/hooks.ts
new file mode 100644
index 0000000..aac431b
--- /dev/null
+++ b/src/console/completion/hooks.ts
@@ -0,0 +1,277 @@
+import React from "react";
+import * as actions from "./actions";
+import { Command } from "../../shared/Command";
+import TabFlag from "../../shared/TabFlag";
+import { CompletionStateContext, CompletionDispatchContext } from "./context";
+import CompletionClient from "../clients/CompletionClient";
+import CommandLineParser, {
+  CommandLine,
+  InputPhase,
+} from "../commandline/CommandLineParser";
+import { UnknownCommandError } from "../commandline/CommandParser";
+import Completions from "../Completions";
+import CompletionType from "../../shared/CompletionType";
+
+const commandDocs = {
+  [Command.Set]: "Set a value of the property",
+  [Command.Open]: "Open a URL or search by keywords in current tab",
+  [Command.TabOpen]: "Open a URL or search by keywords in new tab",
+  [Command.WindowOpen]: "Open a URL or search by keywords in new window",
+  [Command.Buffer]: "Select tabs by matched keywords",
+  [Command.BufferDelete]: "Close a certain tab matched by keywords",
+  [Command.BuffersDelete]: "Close all tabs matched by keywords",
+  [Command.Quit]: "Close the current tab",
+  [Command.QuitAll]: "Close all tabs",
+  [Command.AddBookmark]: "Add current page to bookmarks",
+  [Command.Help]: "Open Vim Vixen help in new tab",
+};
+
+const propertyDocs: { [key: string]: string } = {
+  hintchars: "hint characters on follow mode",
+  smoothscroll: "smooth scroll",
+  complete: "which are completed at the open page",
+  colorscheme: "color scheme of the console",
+};
+
+const completionClient = new CompletionClient();
+
+const getCommandCompletions = async (query: string): Promise<Completions> => {
+  const items = Object.entries(commandDocs)
+    .filter(([name]) => name.startsWith(query))
+    .map(([name, doc]) => ({
+      caption: name,
+      content: name,
+      url: doc,
+    }));
+  return [
+    {
+      name: "Console Command",
+      items,
+    },
+  ];
+};
+
+const getOpenCompletions = async (
+  command: string,
+  query: string,
+  completionTypes: CompletionType[]
+): Promise<Completions> => {
+  const completions: Completions = [];
+  for (const type of completionTypes) {
+    switch (type) {
+      case CompletionType.SearchEngines: {
+        const items = await completionClient.requestSearchEngines(query);
+        if (items.length === 0) {
+          break;
+        }
+        completions.push({
+          name: "Search Engines",
+          items: items.map((key) => ({
+            caption: key.title,
+            content: command + " " + key.title,
+          })),
+        });
+        break;
+      }
+      case CompletionType.History: {
+        const items = await completionClient.requestHistory(query);
+        if (items.length === 0) {
+          break;
+        }
+        completions.push({
+          name: "History",
+          items: items.map((item) => ({
+            caption: item.title,
+            content: command + " " + item.url,
+            url: item.url,
+          })),
+        });
+        break;
+      }
+      case CompletionType.Bookmarks: {
+        const items = await completionClient.requestBookmarks(query);
+        if (items.length === 0) {
+          break;
+        }
+        completions.push({
+          name: "Bookmarks",
+          items: items.map((item) => ({
+            caption: item.title,
+            content: command + " " + item.url,
+            url: item.url,
+          })),
+        });
+        break;
+      }
+    }
+  }
+  return completions;
+};
+
+export const getTabCompletions = async (
+  command: string,
+  query: string,
+  excludePinned: boolean
+): Promise<Completions> => {
+  const items = await completionClient.requestTabs(query, excludePinned);
+  if (items.length === 0) {
+    return [];
+  }
+
+  return [
+    {
+      name: "Buffers",
+      items: items.map((item) => ({
+        content: command + " " + item.url,
+        caption: `${item.index}: ${
+          item.flag != TabFlag.None ? item.flag : " "
+        } ${item.title}`,
+        url: item.url,
+        icon: item.faviconUrl,
+      })),
+    },
+  ];
+};
+
+export const getPropertyCompletions = async (
+  command: string,
+  query: string
+): Promise<Completions> => {
+  const properties = await completionClient.getProperties();
+  const items = properties
+    .map((item) => {
+      const desc = propertyDocs[item.name] || "";
+      if (item.type === "boolean") {
+        return [
+          {
+            caption: item.name,
+            content: command + " " + item.name,
+            url: "Enable " + desc,
+          },
+          {
+            caption: "no" + item.name,
+            content: command + " no" + item.name,
+            url: "Disable " + desc,
+          },
+        ];
+      } else {
+        return [
+          {
+            caption: item.name,
+            content: command + " " + item.name,
+            url: "Set " + desc,
+          },
+        ];
+      }
+    })
+    .reduce((acc, val) => acc.concat(val), [])
+    .filter((item) => item.caption.startsWith(query));
+  return [{ name: "Properties", items }];
+};
+
+export const useCompletions = () => {
+  const state = React.useContext(CompletionStateContext);
+  const dispatch = React.useContext(CompletionDispatchContext);
+  const commandLineParser = React.useMemo(() => new CommandLineParser(), []);
+
+  const updateCompletions = React.useCallback((source: string) => {
+    dispatch(actions.setCompletionSource(source));
+  }, []);
+
+  const initCompletion = React.useCallback((source: string) => {
+    completionClient.getCompletionTypes().then((completionTypes) => {
+      dispatch(actions.initCompletion(completionTypes));
+      dispatch(actions.setCompletionSource(source));
+    });
+  }, []);
+
+  React.useEffect(() => {
+    const text = state.completionSource;
+    const phase = commandLineParser.inputPhase(text);
+    if (phase === InputPhase.OnCommand) {
+      getCommandCompletions(text).then((completions) =>
+        dispatch(actions.setCompletions(completions))
+      );
+    } else {
+      let cmd: CommandLine | null = null;
+      try {
+        cmd = commandLineParser.parse(text);
+      } catch (e) {
+        if (e instanceof UnknownCommandError) {
+          return;
+        }
+      }
+      switch (cmd?.command) {
+        case Command.Open:
+        case Command.TabOpen:
+        case Command.WindowOpen:
+          if (!state.completionTypes) {
+            initCompletion(text);
+            return;
+          }
+
+          getOpenCompletions(
+            cmd.command,
+            cmd.args,
+            state.completionTypes
+          ).then((completions) =>
+            dispatch(actions.setCompletions(completions))
+          );
+          break;
+        case Command.Buffer:
+          getTabCompletions(cmd.command, cmd.args, false).then((completions) =>
+            dispatch(actions.setCompletions(completions))
+          );
+          break;
+        case Command.BufferDelete:
+        case Command.BuffersDelete:
+          getTabCompletions(cmd.command, cmd.args, true).then((completions) =>
+            dispatch(actions.setCompletions(completions))
+          );
+          break;
+        case Command.BufferDeleteForce:
+        case Command.BuffersDeleteForce:
+          getTabCompletions(cmd.command, cmd.args, false).then((completions) =>
+            dispatch(actions.setCompletions(completions))
+          );
+          break;
+        case Command.Set:
+          getPropertyCompletions(cmd.command, cmd.args).then((completions) =>
+            dispatch(actions.setCompletions(completions))
+          );
+          break;
+      }
+    }
+  }, [state.completionSource, state.completionTypes]);
+
+  return {
+    completions: state.completions,
+    updateCompletions,
+    initCompletion,
+  };
+};
+
+export const useSelectCompletion = () => {
+  const state = React.useContext(CompletionStateContext);
+  const dispatch = React.useContext(CompletionDispatchContext);
+  const next = React.useCallback(() => dispatch(actions.selectNext()), [
+    dispatch,
+  ]);
+  const prev = React.useCallback(() => dispatch(actions.selectPrev()), [
+    dispatch,
+  ]);
+  const currentValue = React.useMemo(() => {
+    if (state.select < 0) {
+      return state.completionSource;
+    }
+    const items = state.completions.map((g) => g.items).flat();
+    return items[state.select]?.content || "";
+  }, [state.completionSource, state.select]);
+
+  return {
+    select: state.select,
+    currentValue,
+    selectNext: next,
+    selectPrev: prev,
+  };
+};
diff --git a/src/console/completion/provider.tsx b/src/console/completion/provider.tsx
new file mode 100644
index 0000000..c0de250
--- /dev/null
+++ b/src/console/completion/provider.tsx
@@ -0,0 +1,25 @@
+import reducer, { defaultState } from "./reducer";
+import React from "react";
+import { CompletionDispatchContext, CompletionStateContext } from "./context";
+
+interface Props {
+  initialInputValue: string;
+}
+
+export const CompletionProvider: React.FC<Props> = ({
+  initialInputValue,
+  children,
+}) => {
+  const initialState = {
+    ...defaultState,
+    completionSource: initialInputValue,
+  };
+  const [state, dispatch] = React.useReducer(reducer, initialState);
+  return (
+    <CompletionStateContext.Provider value={state}>
+      <CompletionDispatchContext.Provider value={dispatch}>
+        {children}
+      </CompletionDispatchContext.Provider>
+    </CompletionStateContext.Provider>
+  );
+};
diff --git a/src/console/completion/reducer.ts b/src/console/completion/reducer.ts
new file mode 100644
index 0000000..905451f
--- /dev/null
+++ b/src/console/completion/reducer.ts
@@ -0,0 +1,96 @@
+import Completions from "../Completions";
+import CompletionType from "../../shared/CompletionType";
+import {
+  INIT_COMPLETIONS,
+  SET_COMPLETION_SOURCE,
+  SET_COMPLETIONS,
+  COMPLETION_NEXT,
+  COMPLETION_PREV,
+  CompletionAction,
+} from "./actions";
+
+export interface State {
+  completionTypes?: CompletionType[];
+  completionSource: string;
+  completions: Completions;
+  select: number;
+}
+
+export const defaultState = {
+  completionTypes: undefined,
+  completionSource: "",
+  completions: [],
+  select: -1,
+};
+
+const nextSelection = (state: State): number => {
+  const length = state.completions
+    .map((g) => g.items.length)
+    .reduce((x, y) => x + y, 0);
+  if (length === 0) {
+    return -1;
+  }
+  if (state.select < 0) {
+    return 0;
+  }
+  if (state.select + 1 < length) {
+    return state.select + 1;
+  }
+  return -1;
+};
+
+const prevSelection = (state: State): number => {
+  if (state.completions.length === 0) {
+    return -1;
+  }
+  const length = state.completions
+    .map((g) => g.items.length)
+    .reduce((x, y) => x + y);
+  if (state.select < 0) {
+    return length - 1;
+  }
+  return state.select - 1;
+};
+
+// eslint-disable-next-line max-lines-per-function
+export default function reducer(
+  state: State = defaultState,
+  action: CompletionAction
+): State {
+  switch (action.type) {
+    case INIT_COMPLETIONS:
+      return {
+        ...state,
+        completionTypes: action.completionTypes,
+        completions: [],
+        select: -1,
+      };
+    case SET_COMPLETION_SOURCE:
+      return {
+        ...state,
+        completionSource: action.completionSource,
+        select: -1,
+      };
+    case SET_COMPLETIONS:
+      return {
+        ...state,
+        completions: action.completions,
+      };
+    case COMPLETION_NEXT: {
+      const select = nextSelection(state);
+      return {
+        ...state,
+        select: select,
+      };
+    }
+    case COMPLETION_PREV: {
+      const select = prevSelection(state);
+      return {
+        ...state,
+        select: select,
+      };
+    }
+    default:
+      return state;
+  }
+}