fixed checkout scripts

checkout.bat

@@ -1,11 +1,45 @@
+echo off
 
-git clone https://bitbucket.org/%1/i399 .\.tmp
+set USER=%1
+set TAG=%2
+set TMP=./.tmp
+set SUB_DIR=
 
-cd .\.tmp
+if "%1" == "" (
+  echo Usage: %0 user_name tag
+  exit /b 1
+)
 
-git checkout %2
+if "%TAG%" == "hw3" (
+  echo hw3 not implemented yet
+  exit /b 1
+)
 
-if %errorlevel% neq 0 exit /b %errorlevel%
+if "%TAG%" == "hw4" (
+  echo hw4 not implemented yet
+  exit /b 1
+)
+
+if "%TAG%" == "hw2" (
+  set SUB_DIR=ng1
+)
+
+if "%SUB_DIR%" == "" (
+  echo unknown tag
+  exit /b 1
+)
+
+git clone https://bitbucket.org/%USER%/i399 %TMP%
+
+if %errorlevel% neq 0 exit /b 1
+
+cd %TMP%
+
+git checkout %TAG%
+
+if %errorlevel% neq 0 exit /b 1
+
+cd %SUB_DIR%
 
 call npm install
 

checkout.sh

@@ -2,6 +2,30 @@
 
 set -e
 
-git clone https://bitbucket.org/$1/i399 ./.tmp
+USER=$1
+TAG=$2
+TMP="./.tmp"
+SUB_DIR=""
 
-(cd ./.tmp && git checkout $2 && npm install && npm start)
+if [ $# -eq 0 ];then
+  echo "Usage: $0 <user_name> <tag>"
+  exit 1
+fi
+
+if [ $TAG == "hw3" ] || [ $TAG == "hw4" ]; then
+  echo 'not implemented yet'
+  exit 1
+fi
+
+if [ $TAG == "hw2" ]; then
+  SUB_DIR="ng1"
+fi
+
+if [ -z $SUB_DIR ]; then
+  echo 'unknown tag'
+  exit 1
+fi
+
+git clone https://bitbucket.org/$USER/i399 $TMP
+
+(cd "$TMP" && git checkout $TAG && cd "$SUB_DIR" && npm install && npm start)