add new makefile

Makefile

 # Makefile for qrencode library for Lua
+version=0.1
 
-LIBNAME= qrencode
+name=lua-resty-qrencode
+LUA_VERSION =   5.1
 
-LUAEXE= lua
+# See http://lua-users.org/wiki/BuildingModules for platform specific
+# details.
 
-ROCKSPEC= $(shell find . -name $(LIBNAME)-*-*.rockspec)
+## Linux/BSD
+PREFIX ?=           /usr/local/openresty
+#LDFLAGS +=         -shared
 
-all: install
+## OSX (Macports)
+#PREFIX ?=          /opt/local
+LDFLAGS +=         -bundle -undefined dynamic_lookup
 
-install:
-	luarocks make $(ROCKSPEC)
+## find your luajit path
+LUA_INCLUDE_DIR ?= $(PREFIX)/luajit/include/luajit-2.1
+LUA_LIB_DIR ?=     $(PREFIX)/lualib
+
+# Some versions of Solaris are missing isinf(). Add -DMISSING_ISINF to
+# CFLAGS to work around this bug.
+
+#CFLAGS ?=          -g -Wall -pedantic -fno-inline
+CFLAGS ?=          -g -O3 -Wall -pedantic
+override CFLAGS += -fpic -I$(LUA_INCLUDE_DIR) -lpng -lqrencode
+
+INSTALL ?= install
 
-test: 
-	$(LUAEXE) test/test.lua
+.PHONY: all clean install
 
-.PHONY: all test install
+all: qrencode.so
+
+qrencode.so: qrencode.c
+	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ $^
+
+install:
+	$(INSTALL) -d $(LUA_LIB_DIR)
+	$(INSTALL) qrencode.so $(LUA_LIB_DIR)
 
+clean:
+	rm *.so

README.md

@@ -11,24 +11,39 @@ qrencode is dependent on [libqrencode](http://fukuchi.org/works/qrencode/)
 and [libpng](http://www.libpng.org/pub/png/libpng.html), so make sure these are installed
 before compile it.
 
-## Example usage
+### MacOS
 
-```lua
-qr = require "qrencode"
+```
+$ brew install libqrencode
+$ https://github.com/orangle/lua-resty-qrencode.git
+$ cd lua-resty-qrencode
+$ make
+$ make install
+```
+
+defalut openresty `PREFIX` is `/usr/local/openresty`, if you have a different path, please read `Makefile` and change the path.
+
+### Other
 
--- print PNG data stream to stdout.
+please install libqrencode and libpng, and read Makefile.
 
-print(qr.encode("is ok?"))
-print(qr:encode("is ok?"))
-print(qr("is ok?"))
 
--- print ansi char
-print(qr {text = "is ok?", ansi = true})
+## Example usage
+
+```lua
+    location /qrcode {
+        content_by_lua_block {
+            local qr = require("qrencode")
+            local args = ngx.req.get_uri_args()
+            local text = args.text
 
--- or pass a table :
+            if text == nil or text== "" then
+                ngx.say('need a text param')
+                ngx.exit(404)
+            end
 
-print(qr {
-    text="is ok?",
+            ngx.say(qr {
+                text=text,
                 level="L",
                 kanji=false,
                 ansi=true,
@@ -36,11 +51,17 @@ print(qr {
                 margin=2,
                 symversion=0,
                 dpi=78,
-    casesensitive=false,
+                casesensitive=true,
                 foreground="48AF6D",
                 background="3FAF6F"
-}
-)
+            })
+        }
+    }
+```
+
+test url like
+```
+curl 'http://127.0.0.1:8008/qrcode?text=http://orangleliu.info'
 ```
 
 when pass a table, "text" is required and other is optional.