From e18625310d9e71a1297634e46ea60bde8a782d44 Mon Sep 17 00:00:00 2001
From: rebecca <ubq323@ubq323.website>
Date: Sat, 26 Sep 2026 21:48:19 +0100
Subject: add load_config which might work but its untested sleepycode so maybe
 not

---
 main.lua | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/main.lua b/main.lua
index 103a18c..1df9730 100644
--- a/main.lua
+++ b/main.lua
@@ -1,6 +1,7 @@
 local cqueues = require'cqueues'
 local signal = require'cqueues.signal'
 local class = require'r.class'
+local rtable = require'r.table'
 local pprint = require'pprint'
 
 local config = require'config'
@@ -57,6 +58,41 @@ function Wilson.add_channels_for(self, pylon)
 				pylon:add_channel(channel)
 end end end end
 
+function Wilson.load_config(self, conf)
+	local pneed,phave = rtable.keydiff(conf.pylon, self.pylons)
+	if next(phave) then error"don't know how to remove pylons yet" end
+
+	for pname,p in pairs(conf.pylons) do if self.pylons[pname] then
+		for k,v in pairs(p) do if v ~= self.pylons[pname][k] then
+			error("different field "..k.." on "..pname) end end end end
+
+	-- loop thru buses, form list of channels we need to care about
+	-- don't know how to remove channels yet
+	-- then for pylons need to be constructed, pass them the list of channels to connect to
+	-- verify pylon names are valid here too
+	local ch4p = {} for k in pairs(conf.pylon) do ch4p[k] = {} end
+	for busname,b in pairs(conf.bus) do for i,item in ipairs(b) do
+		local pname,cid = item[1],item[2]
+		if not ch4p[pname] then error("no such pylon "..pname) end
+		table.insert(ch4p[pname], cid) end end
+
+	for pname,p in pairs(conf.pylon) do
+		p.name = pname
+		if self.pylons[pname] then
+			self.pylons[pname]:sync_channels(ch4p[pname])
+		else
+			local cls = assert(pylon_class[p.type], "no such pylon type "..p.type)
+			self.pylon[name] = cls(self, p, ch4p[pname])
+		end
+	end
+
+end
+
+
+	
+
+
+-- find bus containing given channel
 function Wilson._find_bus(self, channel)
 	for name, bus in pairs(self.busses) do
 		for _, q in ipairs(bus) do if q == channel then return bus end end
-- 
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