5 files changed, 160 insertions, 13 deletions
diff --git a/ext/bg/js/api.js b/ext/bg/js/api.js
index da5ae4fe..93d9c155 100644
--- a/ext/bg/js/api.js
+++ b/ext/bg/js/api.js
@@ -144,24 +144,46 @@ async function apiTemplateRender(template, data, dynamic) {
     }
 }
 
-async function apiCommandExec(command) {
+async function apiCommandExec(command, params) {
     const handlers = apiCommandExec.handlers;
     if (handlers.hasOwnProperty(command)) {
         const handler = handlers[command];
-        handler();
+        handler(params);
     }
 }
 apiCommandExec.handlers = {
-    search: () => {
-        chrome.tabs.create({url: chrome.extension.getURL('/bg/search.html')});
+    search: async (params) => {
+        const url = chrome.extension.getURL('/bg/search.html');
+        if (!(params && params.newTab)) {
+            try {
+                const tab = await apiFindTab(1000, (url2) => (
+                    url2 !== null &&
+                    url2.startsWith(url) &&
+                    (url2.length === url.length || url2[url.length] === '?' || url2[url.length] === '#')
+                ));
+                if (tab !== null) {
+                    await apiFocusTab(tab);
+                    return;
+                }
+            } catch (e) {
+                // NOP
+            }
+        }
+        chrome.tabs.create({url});
     },
 
     help: () => {
         chrome.tabs.create({url: 'https://foosoft.net/projects/yomichan/'});
     },
 
-    options: () => {
-        chrome.runtime.openOptionsPage();
+    options: (params) => {
+        if (!(params && params.newTab)) {
+            chrome.runtime.openOptionsPage();
+        } else {
+            const manifest = chrome.runtime.getManifest();
+            const url = chrome.extension.getURL(manifest.options_ui.page);
+            chrome.tabs.create({url});
+        }
     },
 
     toggle: async () => {
@@ -298,3 +320,84 @@ async function apiGetBrowser() {
         return 'chrome';
     }
 }
+
+function apiGetTabUrl(tab) {
+    return new Promise((resolve) => {
+        chrome.tabs.sendMessage(tab.id, {action: 'getUrl'}, {frameId: 0}, (response) => {
+            let url = null;
+            if (!chrome.runtime.lastError) {
+                url = (response !== null && typeof response === 'object' && !Array.isArray(response) ? response.url : null);
+                if (url !== null && typeof url !== 'string') {
+                    url = null;
+                }
+            }
+            resolve({tab, url});
+        });
+    });
+}
+
+async function apiFindTab(timeout, checkUrl) {
+    // This function works around the need to have the "tabs" permission to access tab.url.
+    const tabs = await new Promise((resolve) => chrome.tabs.query({}, resolve));
+    let matchPromiseResolve = null;
+    const matchPromise = new Promise((resolve) => { matchPromiseResolve = resolve; });
+
+    const checkTabUrl = ({tab, url}) => {
+        if (checkUrl(url, tab)) {
+            matchPromiseResolve(tab);
+        }
+    };
+
+    const promises = [];
+    for (const tab of tabs) {
+        const promise = apiGetTabUrl(tab);
+        promise.then(checkTabUrl);
+        promises.push(promise);
+    }
+
+    const racePromises = [
+        matchPromise,
+        Promise.all(promises).then(() => null)
+    ];
+    if (typeof timeout === 'number') {
+        racePromises.push(new Promise((resolve) => setTimeout(() => resolve(null), timeout)));
+    }
+
+    return await Promise.race(racePromises);
+}
+
+async function apiFocusTab(tab) {
+    await new Promise((resolve, reject) => {
+        chrome.tabs.update(tab.id, {active: true}, () => {
+            const e = chrome.runtime.lastError;
+            if (e) { reject(e); }
+            else { resolve(); }
+        });
+    });
+
+    if (!(typeof chrome.windows === 'object' && chrome.windows !== null)) {
+        // Windows not supported (e.g. on Firefox mobile)
+        return;
+    }
+
+    try {
+        const tabWindow = await new Promise((resolve) => {
+            chrome.windows.get(tab.windowId, {}, (tabWindow) => {
+                const e = chrome.runtime.lastError;
+                if (e) { reject(e); }
+                else { resolve(tabWindow); }
+            });
+        });
+        if (!tabWindow.focused) {
+            await new Promise((resolve, reject) => {
+                chrome.windows.update(tab.windowId, {focused: true}, () => {
+                    const e = chrome.runtime.lastError;
+                    if (e) { reject(e); }
+                    else { resolve(); }
+                });
+            });
+        }
+    } catch (e) {
+        // Edge throws exception for no reason here.
+    }
+}
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 7560f39e..f29230a2 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -181,7 +181,7 @@ Backend.messageHandlers = {
     definitionsAddable: ({definitions, modes, optionsContext}) => apiDefinitionsAddable(definitions, modes, optionsContext),
     noteView: ({noteId}) => apiNoteView(noteId),
     templateRender: ({template, data, dynamic}) => apiTemplateRender(template, data, dynamic),
-    commandExec: ({command}) => apiCommandExec(command),
+    commandExec: ({command, params}) => apiCommandExec(command, params),
     audioGetUrl: ({definition, source, optionsContext}) => apiAudioGetUrl(definition, source, optionsContext),
     screenshotGet: ({options}, sender) => apiScreenshotGet(options, sender),
     forward: ({action, params}, sender) => apiForward(action, params, sender),
diff --git a/ext/bg/js/context.js b/ext/bg/js/context.js
index a29f7aa7..8e1dbce6 100644
--- a/ext/bg/js/context.js
+++ b/ext/bg/js/context.js
@@ -25,6 +25,26 @@ function showExtensionInfo() {
     node.textContent = `${manifest.name} v${manifest.version}`;
 }
 
+function setupButtonEvents(selector, command, url) {
+    const node = $(selector);
+    node.on('click', (e) => {
+        if (e.button !== 0) { return; }
+        apiCommandExec(command, {newTab: e.ctrlKey});
+        e.preventDefault();
+    })
+    .on('auxclick', (e) => {
+        if (e.button !== 1) { return; }
+        apiCommandExec(command, {newTab: true});
+        e.preventDefault();
+    });
+
+    if (typeof url === 'string') {
+        node.attr('href', url);
+        node.attr('target', '_blank');
+        node.attr('rel', 'noopener');
+    }
+}
+
 $(document).ready(utilAsync(() => {
     showExtensionInfo();
 
@@ -33,9 +53,11 @@ $(document).ready(utilAsync(() => {
         document.documentElement.dataset.mode = (browser === 'firefox-mobile' ? 'full' : 'mini');
     });
 
-    $('.action-open-search').click(() => apiCommandExec('search'));
-    $('.action-open-options').click(() => apiCommandExec('options'));
-    $('.action-open-help').click(() => apiCommandExec('help'));
+    const manifest = chrome.runtime.getManifest();
+
+    setupButtonEvents('.action-open-search', 'search', chrome.extension.getURL('/bg/search.html'));
+    setupButtonEvents('.action-open-options', 'options', chrome.extension.getURL(manifest.options_ui.page));
+    setupButtonEvents('.action-open-help', 'help');
 
     const optionsContext = {
         depth: 0,
diff --git a/ext/bg/js/search.js b/ext/bg/js/search.js
index a5a815cf..431478c9 100644
--- a/ext/bg/js/search.js
+++ b/ext/bg/js/search.js
@@ -114,6 +114,17 @@ class DisplaySearch extends Display {
         }
     }
 
+    onRuntimeMessage({action, params}, sender, callback) {
+        const handlers = DisplaySearch.runtimeMessageHandlers;
+        if (handlers.hasOwnProperty(action)) {
+            const handler = handlers[action];
+            const result = handler(this, params);
+            callback(result);
+        } else {
+            return super.onRuntimeMessage({action, params}, sender, callback);
+        }
+    }
+
     getOptionsContext() {
         return this.optionsContext;
     }
@@ -188,4 +199,10 @@ class DisplaySearch extends Display {
     }
 }
 
+DisplaySearch.runtimeMessageHandlers = {
+    getUrl: () => {
+        return {url: window.location.href};
+    }
+};
+
 window.yomichan_search = DisplaySearch.create();
diff --git a/ext/bg/js/settings.js b/ext/bg/js/settings.js
index 2c77a0ed..05a0604a 100644
--- a/ext/bg/js/settings.js
+++ b/ext/bg/js/settings.js
@@ -430,9 +430,14 @@ async function onOptionsUpdate({source}) {
     await formWrite(options);
 }
 
-function onMessage({action, params}) {
-    if (action === 'optionsUpdate') {
-        onOptionsUpdate(params);
+function onMessage({action, params}, sender, callback) {
+    switch (action) {
+        case 'optionsUpdate':
+            onOptionsUpdate(params);
+            break;
+        case 'getUrl':
+            callback({url: window.location.href});
+            break;
     }
 }