interpret the '@' syntax if something higher hasn't already done that. (

Azure#1423)

src/azure-cli-core/azure/cli/core/application.py

@@ -6,6 +6,7 @@
 from collections import defaultdict
 import sys
 import os
+import re
 import uuid
 import argparse
 from azure.cli.core.parser import AzCliCommandParser, enable_autocomplete
@@ -196,10 +197,24 @@ def _register_builtin_arguments(**kwargs):
         global_group.add_argument('--debug', dest='_log_verbosity_debug', action='store_true',
                                   help='Increase logging verbosity to show all debug logs.')
 
+    @staticmethod
+    def _maybe_load_file(arg):
+        ix = arg.find('@')
+        if ix == -1:
+            return arg
+
+        if ix == 0:
+            return Application._load_file(arg[1:])
+
+        res = re.match('(\\-\\-?[a-zA-Z0-9]+[\\-a-zA-Z0-9]*\\=)\\"?@([^\\"]*)\\"?', arg)
+        if not res:
+            return arg
+        return res.group(1) + Application._load_file(res.group(2))
+
     @staticmethod
     def _expand_file_prefixed_files(argv):
         return list(
-            [Application._load_file(arg[1:]) if arg.startswith('@') else arg for arg in argv]
+            [Application._maybe_load_file(arg) for arg in argv]
             )
 
     @staticmethod

src/azure-cli-core/azure/cli/core/tests/test_application.py

@@ -5,10 +5,14 @@
 
 import unittest
 
+import os
+import tempfile
+
 from six import StringIO
 
 from azure.cli.core.application import Application, Configuration, IterateAction
 from azure.cli.core.commands import CliCommand
+from azure.cli.core._util import CLIError
 
 class TestApplication(unittest.TestCase):
 
@@ -80,5 +84,32 @@ def handler(args):
         self.assertEqual(hellos[1]['hello'], 'sir')
         self.assertEqual(hellos[1]['something'], 'else')
 
+    def test_expand_file_prefixed_files(self):
+        f = tempfile.NamedTemporaryFile(delete=False)
+        f.close()
+
+        with open(f.name, 'w+') as stream:
+            stream.write('foo')
+
+        cases = [
+            [['--bar=baz'], ['--bar=baz']],
+            [['--bar', 'baz'], ['--bar', 'baz']],
+            [['--bar=@{}'.format(f.name)], ['--bar=foo']],
+            [['--bar', '@{}'.format(f.name)], ['--bar', 'foo']],
+            [['--bar', f.name], ['--bar', f.name]],
+            [['--bar="@{}"'.format(f.name)], ['--bar=foo']],
+            [['[email protected]'], ['[email protected]']],
+            [['--bar', '[email protected]'], ['--bar', '[email protected]']],
+        ]
+
+        for test_case in cases:
+            try:
+                args = Application._expand_file_prefixed_files(test_case[0]) #pylint: disable=protected-access
+                self.assertEqual(args, test_case[1], 'Failed for: {}'.format(test_case[0]))
+            except CLIError as ex:
+                self.fail('Unexpected error for {} ({}): {}'.format(test_case[0], args, ex))
+
+        os.remove(f.name)
+
 if __name__ == '__main__':
     unittest.main()