polishing install options

meson.build

@@ -10,7 +10,6 @@ plugins_list = get_option('plugins')
 
 # Requirements python modules that are required by our plugins
 python_requires = {}
-install_py = get_option('install-python-requirements')
 
 
 # plugin obviously depends on gnome-builder
@@ -103,7 +102,7 @@ foreach key_module, require : python_requires
         	msg_out = 'Find python package @0@=@1@@2@, but require version=@3@'.format(module, ret.stdout().strip(), msg, require)
         endif  # end format msg
 
-        if install_py
+        if get_option('pip')
         	message(msg_out)
 	    	ret = run_command(
 	    		python_helper,

meson_options.txt

@@ -15,8 +15,8 @@ option('plugins',
 		 'python-symbols'],
 	description : 'A comma separated list of plugins to install, default to all'
 )
-option('install-python-requirements',
+option('pip',
 	type : 'boolean',
 	value : false,
-	description : 'Install python-plugins requirements'
+	description : 'Install python-plugins requirements with pip'
 )

python_helper

@@ -106,7 +106,12 @@ def install_package(options):
         print(cp.stderr, cp.stdout, file=sys.stderr)
         sys.exit(1)
     else:
-        print(cp.stdout)
+        out = ""
+        if cp.stderr is not None:
+            out += cp.stderr
+        if cp.stdout is not None:
+            out += cp.stdout
+        print(out)
         sys.exit(0)