support powershell env

emsdk

@@ -31,6 +31,8 @@ binaryen_git_repo = 'https://github.com/WebAssembly/binaryen.git'
 # Enable this to do very verbose printing about the different steps that are being run. Useful for debugging.
 VERBOSE = bool(os.getenv('EMSDK_VERBOSE')) if os.getenv('EMSDK_VERBOSE') != None else False
 
+POWERSHELL = bool(os.getenv('EMSDK_POWERSHELL'))
+
 WINDOWS = False
 if os.name == 'nt' or (os.getenv('SYSTEMROOT') != None and 'WINDOWS' in os.getenv('SYSTEMROOT')) or (os.getenv('COMSPEC') != None and 'WINDOWS' in os.getenv('COMSPEC')):
   WINDOWS = True
@@ -80,7 +82,7 @@ emscripten_config_directory = os.path.expanduser("~/")
 if os.path.exists(os.path.join(emsdk_path(), '.emscripten')):
   emscripten_config_directory = emsdk_path()
 
-EMSDK_SET_ENV = 'emsdk_set_env.bat' if (WINDOWS and not MSYS) else 'emsdk_set_env.sh'
+EMSDK_SET_ENV = 'emsdk_set_env.ps1' if POWERSHELL else 'emsdk_set_env.bat' if (WINDOWS and not MSYS) else 'emsdk_set_env.sh'
 
 # Finds the given executable 'program' in PATH. Operates like the Unix tool 'which'.
 def which(program):
@@ -1880,7 +1882,8 @@ def construct_env(tools_to_activate, permanent):
 #  else:
 
   if os.environ['PATH'] != newpath: # Don't bother setting the path if there are no changes.
-    if WINDOWS and not MSYS: env_string += 'SET PATH=' + newpath + '\n'
+    if POWERSHELL: env_string += '$env:PATH="' + newpath + '"\n'
+    elif WINDOWS and not MSYS: env_string += 'SET PATH=' + newpath + '\n'
     else: env_string += 'export PATH="' + newpath + '"\n'
     if len(added_path) > 0:
       print('Adding directories to PATH:')
@@ -1912,7 +1915,9 @@ def construct_env(tools_to_activate, permanent):
   if len(env_vars_to_add) > 0:
     print('Setting environment variables:')
     for key, value in env_vars_to_add:
-      if WINDOWS and not MSYS:
+      if POWERSHELL:
+        env_string += '$env:' + key + '="' + value + '"\n'
+      elif WINDOWS and not MSYS:
         if permanent:
           env_string += 'SETX ' + key + ' "' + value + '"\n'
         else:

emsdk.bat

@@ -1,5 +1,3 @@
-@SET PREVPATH=%PATH%
-
 :: Find python from an explicit location relative to the Emscripten SDK.
 @IF EXIST "%~dp0python\2.7.5.3_64bit\python.exe" (
   @SET EMSDK_PY="%~dp0python\2.7.5.3_64bit\python.exe"
@@ -21,15 +19,13 @@
   @GOTO end
 )
 
-:: As last resort, access from PATH.
+:: As a last resort, access from PATH.
 @SET EMSDK_PY=python
 
 :end
 @call %EMSDK_PY% "%~dp0\emsdk" %*
 
 @set EMSDK_PY=
-@set PATH=%PREVPATH%
-@set PREVPATH=
 
 :: python is not able to set environment variables to the parent calling process, so
 :: therefore have it craft a .bat file, which we invoke after finishing python execution,

emsdk.ps1

@@ -0,0 +1,37 @@
+$ScriptDirectory = Split-Path -parent $PSCommandPath
+
+$PythonLocations = $(
+    "python\2.7.5.3_64bit\python.exe",
+    "python\2.7.5.3_32bit\python.exe",
+    "python\2.7.5_64bit\python.exe",
+    "python\2.7.5.1_32bit\python.exe"
+)
+
+# Find python from an explicit location relative to the Emscripten SDK.
+foreach ($Location in $PythonLocations) {
+    $FullLocation = Join-Path $ScriptDirectory $Location
+    if (Test-Path $FullLocation) {
+        $EMSDK_PY = $FullLocation
+        break
+    }
+}
+
+# As a last resort, access from PATH.
+if (-Not $EMSDK_PY) {
+    $EMSDK_PY = "python"
+}
+
+# Tell EMSDK to create environment variable setter as a .ps1 file
+$env:EMSDK_POWERSHELL = 1
+
+& $EMSDK_PY "$ScriptDirectory/emsdk" $args
+
+# python is not able to set environment variables to the parent calling process, so
+# therefore have it craft a .ps1 file, which we invoke after finishing python execution,
+# to set up the environment variables
+if (Test-Path "emsdk_set_env.ps1") {
+    & emsdk_set_env.ps1
+    Remove-Item emsdk_set_env.ps1
+}
+
+Remove-Item Env:\EMSDK_POWERSHELL

emsdk_env.ps1

@@ -0,0 +1,2 @@
+$ScriptDirectory = Split-Path -parent $PSCommandPath
+& "$ScriptDirectory/emsdk.ps1" construct_env $args