Find and sort migration files

assets/.init.lua

@@ -1,5 +1,9 @@
 -- LaunchBrowser()
 
+local migrate = require "migrate"
+
+migrate.migrate()
+
 fm = require "fullmoon"
 fm.setTemplate("hello", "Hello, {%& name %}")
 fm.setRoute("/hello/:name", function(r)

assets/.lua/migrate.lua

@@ -0,0 +1,35 @@
+local re = require "re"
+local path = require "path"
+
+local filenameRegex = re.compile([=[^([0-9]+).*\.sql$]=])
+
+local function migrate()
+	local migrations = {}
+	local seqnums = {}
+	local paths = GetZipPaths("/migrations/")
+	for _, p in ipairs(paths) do
+		-- basename -> sequence number
+		-- check that sequence number doesn't already exist
+		local basename = path.basename(p)
+		local _, seqnum = filenameRegex:search(basename)
+		seqnum = tonumber(seqnum)
+		if seqnum and not seqnums[seqnum] then
+			table.insert(seqnums, seqnum)
+			table.insert(migrations, {
+				filename = p,
+				seqnum = seqnum,
+			})
+		else
+			print(string.format("found weird migration name: %s", p))
+		end
+	end
+	
+	table.sort(migrations, function(a, b) return a.seqnum < b.seqnum end)
+	for i,mig in ipairs(migrations) do
+		print(string.format("%d: %s", i, mig.filename))
+	end
+end
+
+return {
+	migrate = migrate,
+}