make server exception for the latest Node.js (v0.12.0)

[weixsong]

I'm using the latest Node.js (v0.12.0) to run the unit test cases by make server, but it report an exception, then I changed to Node.js (v0.10.0), when using make server, it still report an exception.

The following is detailed information.

1. When using Node.js v0.10.0:
   make server run, but when open the link by browser it will report an excepiton.

songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ node -v
v0.10.0
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make test
Starting test server at http://localhost:32423
Took 74ms to run 301 tests. 301 passed, 0 failed.
songwei@songwei-ThinkPad-T410:~/WeiSONG/work/lunr.js/lunr.js$ make server
/usr/local/bin/node server.js 3000

Server listening on 3000

GET /test
/home/songwei/WeiSONG/work/lunr.js/lunr.js/server.js:32
exists(path, function(exists){
^
TypeError: undefined is not a function
at Server. (/home/songwei/WeiSONG/work/lunr.js/lunr.js/server.js:32:3)
at Server.emit (events.js:110:17)
at HTTPParser.parserOnIncoming as onIncoming
at HTTPParser.parserOnHeadersComplete (_http_common.js:111:23)
at Socket.socketOnData (_http_server.js:343:22)
at Socket.emit (events.js:107:17)
at readableAddChunk (_stream_readable.js:163:16)
at Socket.Readable.push (_stream_readable.js:126:10)
at TCP.onread (net.js:529:20)
make: *** [server] Error 1

1. Then I changed to Node.js v0.12.0, make server runs, but when open the link in browser, it report an exception:
   songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ nvm use system
   Now using system version of node: v0.12.0.
   songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ node -v
   v0.12.0
   songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make test
   Starting test server at http://localhost:32423
   Took 74ms to run 301 tests. 301 passed, 0 failed.
   songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make server
   /usr/local/bin/node server.js 3000

   Server listening on 3000

   GET /test
   /home/songwei/WeiSONG/work/lunr.js/lunr.js/server.js:32
   exists(path, function(exists){
   ^
   TypeError: undefined is not a function
   at Server. (/home/songwei/WeiSONG/work/lunr.js/lunr.js/server.js:32:3)
   at Server.emit (events.js:110:17)
   at HTTPParser.parserOnIncoming as onIncoming
   at HTTPParser.parserOnHeadersComplete (_http_common.js:111:23)
   at Socket.socketOnData (_http_server.js:343:22)
   at Socket.emit (events.js:107:17)
   at readableAddChunk (_stream_readable.js:163:16)
   at Socket.Readable.push (_stream_readable.js:126:10)
   at TCP.onread (net.js:529:20)
   make: *** [server] Error 1

Then, I looked the documents of Node.js, it seems that from some specified version, 'exists' function is remove from 'path' module, and moved to 'file' module.
Then, I modified the code in "server.js", it works for Node.js v0.12.0:
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ node -v
v0.12.0
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make server
/usr/local/bin/node server.js 3000

Server listening on 3000

GET /test
GET /test/env/jquery.js
GET /test/env/augment.min.js
GET /test/env/qunit.js
GET /test/env/qunit.css
GET /lib/lunr.js
GET /lib/utils.js
GET /lib/tokenizer.js
GET /lib/pipeline.js
GET /lib/vector.js
GET /lib/sorted_set.js
GET /lib/event_emitter.js
.....

And, it alsl work in Node.js v0.10.0:

songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ nvm use 0.10.0
Now using node v0.10.0
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ node -v
v0.10.0
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make test
Starting test server at http://localhost:32423
Took 74ms to run 301 tests. 301 passed, 0 failed.
songwei@songwei-ThinkPad-T410:/WeiSONG/work/lunr.js/lunr.js$ make server
/usr/local/bin/node server.js 3000

Server listening on 3000

GET /test
GET /test/env/jquery.js
GET /test/env/augment.min.js
GET /test/env/qunit.js
GET /test/env/qunit.css
GET /lib/lunr.js
GET /lib/utils.js
GET /lib/tokenizer.js

[olivernn]

fixed and released in 0.5.8, let me know if there are any further issues.