From ecebc72d3b036de7bf11f2c12fa13ac55a009a68 Mon Sep 17 00:00:00 2001
From: Luca <Luca@hackerspace-bamberg.de>
Date: Thu, 5 Sep 2024 14:52:59 +0200
Subject: [PATCH] style: add and apply editorconfig

---
 .editorconfig |  11 +++
 mqtt.lua      | 248 +++++++++++++++++++++++++-------------------------
 2 files changed, 135 insertions(+), 124 deletions(-)
 create mode 100644 .editorconfig

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..1956a1a
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,11 @@
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = false
+
+[*.lua]
+indent_style = space
+indent_size = 4
diff --git a/mqtt.lua b/mqtt.lua
index e0427e9..e76c89d 100644
--- a/mqtt.lua
+++ b/mqtt.lua
@@ -1,175 +1,175 @@
 local mqtt = {}
 
 local read_varint = function (conn, first_byte)
-	local b
-	if first_byte == nil then
-		b = conn:read(1)
-	else
-		b = first_byte
-	end
+    local b
+    if first_byte == nil then
+        b = conn:read(1)
+    else
+        b = first_byte
+    end
 
-	local n, s = 0, 0
-	while b ~= nil and b & 0x80 == 0x80 do
-		if s > 21 then
-			return 0, "number too large"
-		end
+    local n, s = 0, 0
+    while b ~= nil and b & 0x80 == 0x80 do
+        if s > 21 then
+            return 0, "number too large"
+        end
 
-		n = n + ((b & 0x7F) << s)
-		s = s + 7
-		b = conn:read(1)
-	end
+        n = n + ((b & 0x7F) << s)
+        s = s + 7
+        b = conn:read(1)
+    end
 
-	if b == nil then
-		return n, "eof"
-	end
+    if b == nil then
+        return n, "eof"
+    end
 
-	return n + (b << s), nil
+    return n + (b << s), nil
 end
 
 local MqttClient = {}
 
 function mqtt.open (address, port)
-	local conn = require("internet").open(address, port)
-	if conn == nil then
-		return nil, "connection failed"
-	end
+    local conn = require("internet").open(address, port)
+    if conn == nil then
+        return nil, "connection failed"
+    end
 
-	return MqttClient:new(conn), nil
+    return MqttClient:new(conn), nil
 end
 
 function MqttClient:new (conn)
-	local c = c or {}
-	setmetatable(c, self)
-	self.__index = self
+    local c = c or {}
+    setmetatable(c, self)
+    self.__index = self
 
-	conn.read_varint = read_varint
-	c.conn = conn
-	c.is_connecting = false
-	c.is_connected = false
+    conn.read_varint = read_varint
+    c.conn = conn
+    c.is_connecting = false
+    c.is_connected = false
 
-	return c
+    return c
 end
 
 function MqttClient:handle ()
-	local data = self.conn:read(2)
-	if data == nil then
-		return "eof"
-	end
+    local data = self.conn:read(2)
+    if data == nil then
+        return "eof"
+    end
 
-	local ptype, length, _ = string.unpack("B B", s)
+    local ptype, length, _ = string.unpack("B B", s)
 
-	local length, err = self.conn:read_varint(length)
-	if err ~= nil then
-		return err
-	end
+    local length, err = self.conn:read_varint(length)
+    if err ~= nil then
+        return err
+    end
 
-	if length > 0 then
-		data = self.conn:read(length)
-		if data == nil then
-			return "eof"
-		end
-	else
-		data = ""
-	end
+    if length > 0 then
+        data = self.conn:read(length)
+        if data == nil then
+            return "eof"
+        end
+    else
+        data = ""
+    end
 
-	if ptype & 0xF0 == 0x20 then -- CONNACK
-		if ptype ~= 0x20 or length < 2 then
-			self:disconnect(0x81)
-			return "malformed packet"
-		end
+    if ptype & 0xF0 == 0x20 then -- CONNACK
+        if ptype ~= 0x20 or length < 2 then
+            self:disconnect(0x81)
+            return "malformed packet"
+        end
 
-		local flags, reason, _ = string.unpack("B B", data)
+        local flags, reason, _ = string.unpack("B B", data)
 
-		if flags ~= 0 then
-			self:disconnect(0x81)
-			return "malformed packet"
-		end
+        if flags ~= 0 then
+            self:disconnect(0x81)
+            return "malformed packet"
+        end
 
-		if reason > 127 then
-			self.is_connecting = false
-			self.is_connected = false
-			self.conn:close()
-			self.conn = nil
-			return "connection closed by server"
-		elseif reason ~= 0 then
-			self:disconnect(0x81)
-			return "malformed packet"
-		end
+        if reason > 127 then
+            self.is_connecting = false
+            self.is_connected = false
+            self.conn:close()
+            self.conn = nil
+            return "connection closed by server"
+        elseif reason ~= 0 then
+            self:disconnect(0x81)
+            return "malformed packet"
+        end
 
-		self.is_connecting = false
-		self.is_connected = true
-	elseif ptype == 0x40 then -- PUBACK
-		-- TODO
-	elseif ptype == 0xD0 then -- PINGRESP
-		-- TODO
-	elseif ptype == 0xE0 then -- DISCONNECT
-		-- TODO
-	end
+        self.is_connecting = false
+        self.is_connected = true
+    elseif ptype == 0x40 then -- PUBACK
+        -- TODO
+    elseif ptype == 0xD0 then -- PINGRESP
+        -- TODO
+    elseif ptype == 0xE0 then -- DISCONNECT
+        -- TODO
+    end
 
-	return nil
+    return nil
 end
 
 function MqttClient:connect (username, password)
-	if self.is_connecting or self.is_connected then
-		return nil
-	end
+    if self.is_connecting or self.is_connected then
+        return nil
+    end
 
-	local length = 15
-	local flags = 1
-	if username ~= nil then
-		length = length + 2 + #username
-		flags = flags | 0x80
-	end
-	if password ~= nil then
-		length = length + 2 + #password
-		flags = flags | 0x40
-	end
+    local length = 15
+    local flags = 1
+    if username ~= nil then
+        length = length + 2 + #username
+        flags = flags | 0x80
+    end
+    if password ~= nil then
+        length = length + 2 + #password
+        flags = flags | 0x40
+    end
 
-	if length > 127 then
-		return "packet size exceeds current implementation capabilities"
-	end
+    if length > 127 then
+        return "packet size exceeds current implementation capabilities"
+    end
 
-	local data = string.pack("> B B s2 B B I2 B s2", 0x10, length, "MQTT", 5, flags, 0, 0, "")
-	if username ~= nil then
-		data = data .. string.pack("> s2", username)
-	end
-	if password ~= nil then
-		data = data .. string.pack("> s2", password)
-	end
+    local data = string.pack("> B B s2 B B I2 B s2", 0x10, length, "MQTT", 5, flags, 0, 0, "")
+    if username ~= nil then
+        data = data .. string.pack("> s2", username)
+    end
+    if password ~= nil then
+        data = data .. string.pack("> s2", password)
+    end
 
-	local _, err = self.conn:write(data)
-	if err ~= nil then
-		return err
-	end
+    local _, err = self.conn:write(data)
+    if err ~= nil then
+        return err
+    end
 
-	self.is_connecting = true
+    self.is_connecting = true
 
-	return nil
+    return nil
 end
 
 function MqttClient:disconnect (reason)
-	if not (self.is_connecting or self.is_connected) then
-		return nil
-	end
+    if not (self.is_connecting or self.is_connected) then
+        return nil
+    end
 
-	if reason == nil then
-		reason = 0
-	end
+    if reason == nil then
+        reason = 0
+    end
 
-	local data = string.pack("> B B B", 0xE0, 1, reason)
+    local data = string.pack("> B B B", 0xE0, 1, reason)
 
-	local _, err = self.conn:write(data)
-	if err ~= nil then
-		return err
-	end
+    local _, err = self.conn:write(data)
+    if err ~= nil then
+        return err
+    end
 
-	self.is_connecting = false
-	self.is_connected = false
+    self.is_connecting = false
+    self.is_connected = false
 
-	self.conn:close()
-	self.conn = nil
+    self.conn:close()
+    self.conn = nil
 
-	return nil
+    return nil
 end
 
 return mqtt