add combine image logic (#14)

* add combine image logic

* remove unnecessary log

test/test_ngx.lua

@@ -0,0 +1,25 @@
+--local str = "form-data; name=\"files[]\"; filename=\"Song-of-joy.png\""
+--local ext = ngx.re.match(str, [[filename=".*\.(\w+)"]], "jo")
+--print(ext)
+
+local magick = "/usr/local/ImageMagick/bin/magick"
+local tmp = io.open(magick,"r")
+if tmp == nil then
+    -- in mac os
+    magick = "/usr/local/bin/magick"
+else
+    io.close(tmp)
+end
+print(magick)
+--
+--local origin = {
+--    "/Users/moicen/Music/alchemy/Song-of-joy.png",
+--    "/Users/moicen/Music/alchemy/You-and-me.png"
+--}
+--origin = table.concat(origin, " ")
+--ngx.log(ngx.ERR, origin)
+--local file = io.popen("/usr/local/bin/magick convert -append " .. origin .. " /tmp/combined.jpeg" )
+--local output = file:read("*all")
+--file:close()
+--ngx.say(output)
+

test/test_var.lua

@@ -1,8 +1,2 @@
----
---- Generated by EmmyLua(https://github.com/EmmyLua)
---- Created by moicen.
---- DateTime: 2021/9/4 12:20
----
-
 ngx.say('file dir...', ngx.var.tmp_file_dir)
 ngx.say('task server...', ngx.var.task_server)