The browser that
runs your code.

-- Block trackers at the network layer, strip leftovers in every frame.
lemurx.net.addRule({
  match  = "*://*.doubleclick.net/*",
  action = "block",
})

lemurx.tabs.on("document", function(ev)
  lemurx.tabs.inject(ev.id, [[
    document.querySelectorAll('.ad, [id^="ad-"], [class*="sponsored"]')
            .forEach(function (e) { e.remove(); });
  ]], { world = "isolated", frames = "all" })
end)

-- A real button on the real toolbar, plus a persistent skin.
lemurx.theme.apply("midnight")

lemurx.ui.render("toolbar.end", {
  type = "button", text = "Reader",
  onClick = function()
    local tab = lemurx.tabs.current()
    if not tab then return end
    lemurx.tabs.inject(tab.id, [[
      document.body.style.maxWidth = "42em";
      document.body.style.margin   = "0 auto";
      document.body.style.fontSize = "1.15em";
    ]], { world = "main" })
  end,
})

-- A floating HUD built from native views, refreshed twice a second.
local h = lemurx.ui.h

lemurx.ui.render("page.float", h("column", {
  id = "hud", gravity = "end|bottom", padding = { 12, 8 }, radius = 14,
  background = "#CC0B1020",
  onClick = function() lemurx.ui.unmount("page.float") end,   -- tap to dismiss
}, {
  h("text", { id = "hud_title", text = "…", color = "#E6F1FF", size = 13, maxLines = 1, ellipsize = true }),
  h("text", { id = "hud_meta",  text = "",  color = "#2EE6D6", size = 12, font = "monospace" }),
}))

lemurx.timer.every(500, function()
  local t = lemurx.tabs.current()
  if not t then return end
  lemurx.ui.update("hud_title", { text = t.title or t.url })
  lemurx.ui.update("hud_meta", {
    text = ("%d tabs  zoom %d%%  %s"):format(
      #lemurx.tabs.list(), lemurx.tabs.getZoom(t.id), t.loading and "loading" or "idle"),
  })
end)

-- The entire Chrome DevTools Protocol, on a phone, from Lua.
local tab = lemurx.tabs.current().id

lemurx.cdp.send(tab, "Emulation.setGeolocationOverride", {
  latitude = 35.6762, longitude = 139.6503, accuracy = 1,
})
lemurx.cdp.send(tab, "Network.emulateNetworkConditions", {
  offline = false, latency = 400, downloadThroughput = 50 * 1024, uploadThroughput = 20 * 1024,
})

local dpr    = lemurx.v8.eval(tab, "innerWidth * devicePixelRatio")
local frames = lemurx.blink.frames(tab)          -- Page.getFrameTree
local a11y   = lemurx.ax.tree(tab)               -- full Blink accessibility tree, as a Lua table
print(dpr, #frames.result.frameTree.childFrames, #a11y.result.nodes)

-- The toolbar, the menu and the system dialogs are plain Android views. Rewire them.
local h = lemurx.ui.h

-- Replace the real Home button with "to top".
lemurx.ui.replace({ id = "home_button" }, h("button", {
  id = "my_home", text = "↑", background = "#FF00C853", color = "#FFFFFFFF",
  onClick = function()
    local t = lemurx.tabs.current()
    if t then lemurx.tabs.eval(t.id, "window.scrollTo({top:0,behavior:'smooth'})") end
  end,
}))

-- Take over a native click without swallowing it; restyle the drawer once it is open.
lemurx.ui.on({ id = "menu_button_wrapper" }, "click", function()
  lemurx.timer.after(400, function()
    lemurx.ui.style({ text = "History" }, { color = "#FFFF5252", once = true })
  end)
end, { consume = false })

-- Don't know the id? Ask.
print(lemurx.ui.shell().found)          -- known shell ids and whether they are still there
lemurx.ui.dump({ maxDepth = 6 })        -- every window: Activity, Dialogs, PopupWindows

-- Chromium's own services, from Lua: PrefService, content settings, feature flags, browsing data.
local p = lemurx.prefs.get("safebrowsing.enabled", "bool")
print(p.value, p.isDefault, p.managed)
lemurx.prefs.set("webkit.webprefs.default_font_size", "int", 18)

lemurx.perm.set("https://example.com", "javascript", "block")
lemurx.perm.set("https://maps.example", "geolocation", "allow")

print(lemurx.features.enabled("BackForwardCache"),
      lemurx.features.param("BackForwardCache", "cache_size"))

for _, v in ipairs(lemurx.history.query("github")) do print(v.title, v.url) end
for _, c in ipairs(lemurx.cookie.get("https://github.com")) do print(c.name, c.httpOnly) end

lemurx.data.clear({ "cache", "site_data" }, "hour")      -- BrowsingDataRemover