add limit to download queue

This avoids a bunch of downloads being triggered when quickly scrolling
through a menu.

1 files changed, 12 insertions, 5 deletions

diff --git a/downloader.lua b/downloader.lua
index a8519dd..7881129 100644
--- a/downloader.lua
+++ b/downloader.lua
@@ -6,11 +6,13 @@ local downloader = {}
 local mt = {}
 mt.__index = mt
 
-function downloader.new()
-	return setmetatable({
-		pending = {},
-		running = false,
-	}, mt)
+function downloader.new(t)
+	t = setmetatable(t or {}, mt)
+
+	t.pending = {}
+	t.running = false
+
+	return t
 end
 
 function mt:exec(url, file, cb)
@@ -60,6 +62,11 @@ end
 -- likely to be used for the current display state
 function mt:schedule(...)
 	if self.running then
+		if self.limit and #self.pending >= self.limit then
+			-- remove oldest
+			table.remove(self.pending, 1)
+		end
+
 		self.pending[#self.pending+1] = {...}
 	else
 		self:exec(...)