From 9feca9b0b90a107ece6be1b4d197e08020a40690 Mon Sep 17 00:00:00 2001
From: Omar Rizwan <omar@omar.website>
Date: Sun, 13 Dec 2020 22:02:29 -0800
Subject: Add unlink support. Make by-title/ writable. Add . and .. entries.

Still haven't added the unlink handler to by-title/, though.
---
 README.md               |  6 +++++-
 extension/background.js | 21 ++++++++++++++-------
 fs/tabfs.c              | 13 ++++++++++++-
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 0fd6c42..fc13381 100644
--- a/README.md
+++ b/README.md
@@ -54,12 +54,16 @@ $ echo remove | tee -a mnt/tabs/by-title/*Stack_Overflow*/control
 $ cat mnt/tabs/by-id/*/text > text.txt
 ```
 
+### TODO: Manage tabs in Emacs dired
+
+I do this
+
 ## Setup
 
 **disclaimer**: security, functionality. In some sense, the whole
 point of this extension is to create a gigantic new surface area of
 communication between stuff inside your browser and the rest of your
-computer.
+computer. permissions
 
 First, install the browser extension.
 
diff --git a/extension/background.js b/extension/background.js
index 964e210..a233f27 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -156,7 +156,7 @@ const defineFile = (getData, setData) => ({
 router["/tabs/by-id"] = {  
   async readdir() {
     const tabs = await browser.tabs.query({});
-    return { entries: tabs.map(tab => String(tab.id)) };
+    return { entries: [".", "..", ...tabs.map(tab => String(tab.id))] };
   }
 };
 // (should these have .txt extensions?)
@@ -169,7 +169,7 @@ router["/tabs/by-id"] = {
 // TODO: mem (?)
 // TODO: cpu (?)
 
-// screenshot.png (TODO: when unfocused?)
+// screenshot.png (FIXME: how to keep from blocking when unfocused?)
 // TODO: archive.mhtml ?
 // TODO: printed.pdf
 // control
@@ -203,7 +203,7 @@ router["/tabs/by-id/*/resources"] = {
     const tabId = parseInt(pathComponent(path, -2));
     await TabManager.debugTab(tabId); await TabManager.enableDomainForTab(tabId, "Page");
     const {frameTree} = await sendDebuggerCommand(tabId, "Page.getResourceTree", {});
-    return { entries: frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200))) };
+    return { entries: [".", "..", ...frameTree.resources.map(r => sanitize(String(r.url).slice(0, 200)))] };
   }
 };
 router["/tabs/by-id/*/resources/*"] = defineFile(async path => {
@@ -232,7 +232,7 @@ router["/tabs/by-id/*/scripts"] = {
   },
   async readdir({path}) {
     const tabId = parseInt(pathComponent(path, -2));
-    return { entries: BrowserState.scriptsForTab[tabId].map(params => sanitize(params.url).slice(0, 200) + "_" + params.scriptId) };
+    return { entries: [".", "..", ...BrowserState.scriptsForTab[tabId].map(params => sanitize(params.url).slice(0, 200) + "_" + params.scriptId)] };
   }
 };
 router["/tabs/by-id/*/scripts/*"] = defineFile(async path => {
@@ -265,9 +265,16 @@ router["/tabs/by-id/*/control"] = {
 };
 
 router["/tabs/by-title"] = {
+  getattr() { 
+    return {
+      st_mode: unix.S_IFDIR | 0777,
+      st_nlink: 3,
+      st_size: 0,
+    };
+  },
   async readdir() {
     const tabs = await browser.tabs.query({});
-    return { entries: tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id)) };
+    return { entries: [".", "..", ...tabs.map(tab => sanitize(String(tab.title).slice(0, 200)) + "_" + String(tab.id))] };
   }
 };
 router["/tabs/by-title/*"] = {
@@ -304,7 +311,7 @@ for (let key in router) {
                                       (k.match(/\//g) || []).length ===
                                         (path.match(/\//g) || []).length + 1)
                            .map(k => k.substr((path === '/' ? 0 : path.length) + 1).split('/')[0]);
-      children = [...new Set(children)];
+      children = [".", "..", ...new Set(children)];
 
       router[path] = { readdir() { return { entries: children }; } };
     }
@@ -342,7 +349,7 @@ for (let key in router) {
   } else if (router[key].readlink) {
     router[key] = {
       async getattr({path}) {
-        const st_size = (await this.readlink({path})).length + 1;
+        const st_size = (await this.readlink({path})).buf.length + 1;
         return {
           st_mode: unix.S_IFLNK | 0444,
           st_nlink: 1,
diff --git a/fs/tabfs.c b/fs/tabfs.c
index 13cd7ee..803d6c2 100644
--- a/fs/tabfs.c
+++ b/fs/tabfs.c
@@ -225,9 +225,18 @@ tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
     /* }); */
 }
 
+static int tabfs_unlink(const char *path) {
+    send_request("{op: %Q, path: %Q}", "unlink", path);
+
+    receive_response("{}", NULL);
+
+    return 0;
+}
+
 static struct fuse_operations tabfs_filesystem_operations = {
     .getattr  = tabfs_getattr, /* To provide size, permissions, etc. */
     .readlink = tabfs_readlink,
+
     .open     = tabfs_open,    /* To enforce read-only access.       */
     .read     = tabfs_read,    /* To provide file content.           */
     .write    = tabfs_write,
@@ -235,7 +244,9 @@ static struct fuse_operations tabfs_filesystem_operations = {
 
     .opendir  = tabfs_opendir,
     .readdir  = tabfs_readdir, /* To provide directory listing.      */
-    .releasedir = tabfs_releasedir
+    .releasedir = tabfs_releasedir,
+
+    .unlink = tabfs_unlink
 };
 
 int main(int argc, char **argv) {
-- 
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