Add initial implementation of /tabs/create-reuse

1 files changed, 30 insertions, 0 deletions

diff --git a/extension/background.js b/extension/background.js
index 0d95b95..411930c 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -215,6 +215,36 @@ Routes["/tabs/create"] = {
   async truncate() { return {}; }
 };
 
+Routes["/tabs/create-reuse"] = {
+  description: 'Open a URL, reusing existing tabs where it makes sense.',
+  usage: 'echo "https://en.wikipedia.org/wiki/HTTP#History" > $0',
+  async write({buf}) {
+    const CURRENT = browser.windows.WINDOW_ID_CURRENT
+    const url = buf.trim();
+
+    let tabs = await browser.tabs.query({url}),
+        tab, t
+    // algorithm improvements welcome
+    if (t = tabs.find(t => t.active && t.windowId == CURRENT))
+      tab = t
+    else if (t = tabs.find(t => t.windowId == CURRENT))
+      tab = t
+    else
+      tab = tabs[0]
+    if (!tab) tab = await browser.tabs.create({url})
+
+    let nurl = new URL(url),
+        ourl = new URL(tab.url)
+    if (ourl.hash != nurl.hash) {
+      ourl.hash = nurl.hash
+      tab.url = ourl.toString()
+    }
+
+    return {size: stringToUtf8Array(buf).length};
+  },
+  async truncate() { return {}; }
+};
+
 Routes["/tabs/by-title"] = {
   description: 'Open tabs, organized by title; each subfolder represents an open tab.',
   usage: 'ls $0',