add string split+trim functions; add a fancier command line opt-parser; allow custom user conf with "-user=conf.json"

pkg/base/client_start.lua

@@ -38,7 +38,14 @@ if not map_fname then
 	error("server should have sent map name by now")
 end
 
-user_config = common.json_load("clsave/pub/user.json")
+local loose, user_toggles, user_settings = parse_commandline_options({...})
+
+local user_config_filename = 	user_settings['user'] or 
+								"clsave/pub/user.json"
+
+-- FIXME: we don't expose documentation for valid user settings anywhere
+
+user_config = common.json_load(user_config_filename)
 print("json done!")
 print("name:", user_config.name)
 print("kick on join:", user_config.kick_on_join)

pkg/base/common.lua

@@ -341,3 +341,69 @@ end
 damage_blk = {}
 players = {max = 32, current = 1}
 intent = {}
+
+function string.split(s, sep, plain)
+	local start = 1
+	local done = false
+	local function pass(i, j, ...)
+		if i then
+			local seg = s:sub(start, i - 1)
+			start = j + 1
+			return seg, ...
+		else
+			done = true
+			return s:sub(start)
+		end
+	end
+	local result = {}
+	while not done do
+		if sep == '' then done = true result[#result+1]=s end
+		result[#result+1]=pass(s:find(sep, start, plain))
+	end
+	return result
+end
+
+-- trim the character 'sep' from the left hand side of the string
+function string.triml(s, sep)
+	sep = string.byte(sep)
+	if s == '' then return s end
+	local pos = 1
+	while string.byte(s,pos)==sep and #s<=pos do pos = pos + 1 end
+	return string.sub(s, pos+1)
+end
+
+-- trim the character 'sep' from the right hand side of the string
+function string.trimr(s, sep)
+	sep = string.byte(sep)
+	if s == '' then return s end
+	local pos = #s
+	while string.byte(s, pos)==sep and pos>=1 do pos = pos - 1 end
+	return string.sub(s, 1, pos)
+end
+
+-- trim the character 'sep' from both sides of the string
+function string.trim(s, sep)
+	return string.triml(string.trimr(s, sep), sep)
+end
+
+function parse_commandline_options(options)
+	local user_toggles = {} -- toggle options (key is name, value is position)
+	local user_settings = {} -- key-value pairs
+	local loose = {} -- loose strings, filenames, etc.
+
+	for k, v in pairs(options) do
+		local setting_pair = string.split(v, "=")
+		local first = string.byte(v,1)
+		if first==string.byte('-') then -- we are toggling an option or setting a value
+			if #setting_pair == 2 then -- we are setting a key to a value
+				user_settings[string.triml(setting_pair[1], '-')]=setting_pair[2]
+				print(string.triml(setting_pair[1], '-'),"trimmed")
+			else
+				user_toggles[string.triml(v, '-')]=k
+			end
+		else -- add to the loose values
+			loose[#loose+1] = v
+		end
+	end
+	return loose, user_toggles, user_settings
+end

pkg/base/main_server.lua

@@ -287,8 +287,12 @@ function server.hook_tick(sec_current, sec_delta)
 	return 0.005
 end
 
+-- parse arguments
+
+local loose, user_toggles, user_settings = parse_commandline_options({...})
+
 -- load map
-map_fname = ...
+map_fname = loose[1]
 map_fname = map_fname or MAP_DEFAULT
 map_loaded = common.map_load(map_fname, "auto")
 common.map_set(map_loaded)