Initial release

README.md

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+# Autofilter
+![mod thumbnail](https://raw.githubusercontent.com/Wyrrrd/Autofilter/master/thumbnail.png)
+
+Description
+- When you place a filter inserter, it reads either the inventory contents or inventory filters on the input side and sets it's filter to those items.
+- Works only until the inserter filter is full (of course).
+- The mode can be changed or disabled in player mod settings on the fly as needed.

changelog.txt

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+---------------------------------------------------------------------------------------------------
+Version: 0.18.0
+Date: 22. 2. 2020
+  Changes:
+    - Initial release
+---------------------------------------------------------------------------------------------------

control.lua

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+--control.lua
+
+--functions definitions
+local function get_items_by_content(inserter,inventory)
+	local items = {}
+	for item,count in pairs(inventory.get_contents()) do
+		if #items < inserter.filter_slot_count then
+			items[#items+1] = item
+		end
+	end
+	return items
+end
+
+local function get_items_by_filter(inserter,inventory)
+	local items = {}
+	for slot = 1,#inventory,1 do
+		if #items < inserter.filter_slot_count and inventory.get_filter(slot) then
+			items[#items+1] = inventory.get_filter(slot)
+		end
+	end
+	return items
+end
+
+local function on_built_entity(event)
+	local inserter = event.created_entity
+	if inserter.filter_slot_count then
+		local inventory = inserter.surface.find_entities_filtered({position = inserter.pickup_position, limit = 1})[1].get_output_inventory()
+		if inventory then
+			local mode = game.players[event.player_index].mod_settings["Autofilter_Mode"].value
+			if mode == "content" and not inventory.is_empty() then
+				for slot,item in pairs(get_items_by_content(inserter,inventory)) do
+					inserter.set_filter(slot,item)
+				end
+			elseif mode == "filter" and inventory.is_filtered() then
+				for slot,item in pairs(get_items_by_filter(inserter,inventory)) do
+					inserter.set_filter(slot,item)
+				end
+			end
+		end
+	end
+end
+
+--event handling
+script.on_event(defines.events.on_built_entity, on_built_entity,{{filter="type", type = "inserter"}})

info.json

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+{
+	"name": "Autofilter",
+	"version": "0.18.0",
+	"title": "Autofilter",
+	"author": "Wyrrrd",
+	"dependencies": ["base >= 0.18.0"],
+	"description": "Automatically set inserter filters based on adjacent inventory.",
+	"factorio_version": "0.18"
+}

locale/de/strings.cfg

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+[mod-setting-name]
+Autofilter_Mode=Autofilter-Modus
+
+[mod-setting-description]
+Autofilter_Mode=Ändere, ob Greifarmfilter durch Inventarinhalt, Inventarfilter oder gar nicht gesetzt werden sollen.
+
+[string-mod-setting]
+Autofilter_Mode-content=Inhalt
+Autofilter_Mode-filter=Filter
+Autofilter_Mode-none=Keiner

locale/en/strings.cfg

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+[mod-setting-name]
+Autofilter_Mode=Autofilter Mode
+
+[mod-setting-description]
+Autofilter_Mode=Change if inserter filters should be set from inventory items, inventory filter or not at all.
+
+[string-mod-setting]
+Autofilter_Mode-content=Content
+Autofilter_Mode-filter=Filter
+Autofilter_Mode-none=None

settings.lua

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+data:extend({
+    {
+        type = "string-setting",
+        name = "Autofilter_Mode",
+        default_value = "content",
+        allowed_values = {"content","filter","none"},
+        setting_type = "runtime-per-user",
+        order = "a",
+    },
+})