add search directory support for bsb, so that user can run bsb in any subdirectory of the project

Author: bobzhang

bin/bsb

@@ -2,5 +2,25 @@
 "use strict";
 
 var child_process = require('child_process')
+var fs = require('fs')
+var bsconfig = 'bsconfig.json'
+var bsb_exe = __filename + ".exe"
+var delegate_args = process.argv.slice(2)
 
-child_process.execFileSync(__filename + ".exe", process.argv.slice(2), {stdio:[0,1,2]})
+if(fs.existsSync(bsconfig)){
+    child_process.execFileSync(bsb_exe, delegate_args, {stdio:'inherit'})
+} else {
+    var path = require('path')
+    var last_dir = process.cwd()
+    var search_dir = last_dir 
+    do{
+        last_dir = search_dir
+        search_dir = path.dirname(last_dir)        
+    }while(!fs.existsSync(path.join(search_dir,bsconfig)) && (search_dir.length !== search_dir.length))
+    if(search_dir.length === last_dir.length){
+        console.error('bsconfig.json not found in current directory and its parent')
+        process.exit(2)
+    }else{
+        child_process.execFileSync(bsb_exe, delegate_args, {stdio:'inherit', cwd: search_dir} )
+    } 
+}