completer improvements

add support for s3 and local path completion in s3 commands.
the s3 path completion includes both bucket names and prefixes.
in case --profile/--region are passed on the command line, they are used
when performing the s3 queries.
the creation of the 'help command' was moved away from the constructor
since it takes a considerable amount of time, and is not required for path
completion.
also, support completion of --profile p<TAB> (partial profile name)

awscli/clidriver.py

@@ -71,8 +71,8 @@ def main():
     return rc
 
 
-def create_clidriver():
-    session = botocore.session.Session(EnvironmentVariables)
+def create_clidriver(profile=None):
+    session = botocore.session.Session(EnvironmentVariables, profile=profile)
     _set_user_agent_for_session(session)
     load_plugins(session.full_config.get('plugins', {}),
                  event_hooks=session.get_component('event_emitter'))

awscli/completer.py

@@ -13,30 +13,53 @@
 import sys
 import logging
 import copy
+import subprocess
+from botocore.exceptions import ClientError
 
 LOG = logging.getLogger(__name__)
 
 
 class Completer(object):
 
-    def __init__(self, driver=None):
+    S3_SCHEME = 's3://'
+
+    def __init__(self, driver=None, region=None):
         if driver is not None:
             self.driver = driver
         else:
             self.driver = awscli.clidriver.create_clidriver()
-        self.main_help = self.driver.create_help_command()
-        self.main_options = self._get_documented_completions(
-            self.main_help.arg_table)
+        self.region = region
+        self.main_help = None
+        self.s3 = None
 
     def complete(self, cmdline, point=None):
-        if point is None:
-            point = len(cmdline)
+        if point is not None:
+            cmdline = cmdline[0:point]
 
-        args = cmdline[0:point].split()
+        args = cmdline.split()
         current_arg = args[-1]
+
+        if (not cmdline.endswith(current_arg)
+            and not current_arg.startswith('-')):
+            # There are spaces after the arg, treat it as a new arg
+            current_arg = ''
+            args.append('')
+
+        if len(args) > 1 and args[-2] == '--profile':
+            return [n for n in self.driver.session.available_profiles
+                if n.startswith(args[-1])]
+
+        args_set = set(args)
+        if 's3' in args_set and not current_arg.startswith('-'):
+            if len(args_set & set(['cp', 'mv', 'sync'])) > 0:
+                return self._complete_s3_arg(current_arg, True)
+            elif len(args_set & set(['ls', 'presign', 'rm'])) > 0:
+                return self._complete_s3_arg(current_arg, False)
+
         cmd_args = [w for w in args if not w.startswith('-')]
         opts = [w for w in args if w.startswith('-')]
 
+        self.main_help = self.driver.create_help_command()
         cmd_name, cmd = self._get_command(self.main_help, cmd_args)
         subcmd_name, subcmd = self._get_command(cmd, cmd_args)
 
@@ -61,6 +84,88 @@ def _complete_command(self, command_name, command_help, current_arg, opts):
                 command_help.command_table, current_arg)
         return []
 
+
+    def _complete_s3_bucket(self, current_arg):
+        response = self.s3.list_buckets()
+        result = []
+        for bucket in response['Buckets']:
+            if bucket['Name'].startswith(current_arg):
+                result.append(bucket['Name'] + '/')
+        return result
+
+    def _complete_s3_prefix(self, current_arg):
+        split_arg = current_arg.split('/', 1)
+        if len(split_arg) < 2:
+            return self._complete_s3_bucket(current_arg)
+
+        bucket_name, prefix = split_arg
+        paginator = self.s3.get_paginator('list_objects')
+        page_iterator = paginator.paginate(Bucket=bucket_name, Prefix=prefix,
+            Delimiter='/')
+
+        result = []
+        for page in page_iterator:
+            if 'CommonPrefixes' in page:
+                for item in page['CommonPrefixes']:
+                    result.append('%s/%s' % (bucket_name, item['Prefix']))
+            if 'Contents' in page:
+                for item in page['Contents']:
+                    result.append('%s/%s' % (bucket_name, item['Key']))
+
+        return result
+
+    def _complete_s3_prefix_loop(self, current_arg=''):
+        result = []
+        for i in range(10):
+            try:
+                cur = self._complete_s3_prefix(current_arg)
+            except ClientError:
+                break
+            if len(cur) == 0:
+                break
+
+            result = cur
+            if len(cur) != 1:
+                break
+            current_arg = cur[0]
+
+        return [self.S3_SCHEME + n for n in result]
+
+    def _complete_local_path(self, current_arg):
+        # Delegate to compgen for local file completion
+        cmd_args = ['bash', '-c', 'compgen -f -- %s' % current_arg]
+        try:
+            return (subprocess.check_output(cmd_args).decode('utf-8')
+                .splitlines())
+        except subprocess.CalledProcessError:
+            return []
+
+    def _complete_s3_arg(self, current_arg, local):
+        self.s3 = self.driver.session.create_client('s3',
+            region_name=self.region)
+
+        result = []
+        if current_arg.startswith(self.S3_SCHEME):
+            # S3 path completion
+            result = self._complete_s3_prefix_loop(
+                current_arg[len(self.S3_SCHEME):])
+        else:
+            if self.S3_SCHEME.startswith(current_arg):
+                # Arg is a prefix of s3 scheme - perform s3 path completion
+                result = self._complete_s3_prefix_loop()
+
+            if local:
+                # Local path completion
+                result += self._complete_local_path(current_arg)
+
+        if ':' in current_arg:
+            # Bash starts the completion from the last :, strip anything that
+            # precedes it
+            strip = current_arg.rfind(':') + 1
+            result = [n[strip:] for n in result]
+
+        return result
+
     def _complete_subcommand(self, subcmd_name, subcmd_help, current_arg, opts):
         if current_arg != subcmd_name and current_arg.startswith('-'):
             return self._find_possible_options(current_arg, opts, subcmd_help)
@@ -109,7 +214,9 @@ def _get_documented_completions(self, table, startswith=None):
         return names
 
     def _find_possible_options(self, current_arg, opts, subcmd_help=None):
-        all_options = copy.copy(self.main_options)
+        main_options = self._get_documented_completions(
+            self.main_help.arg_table)
+        all_options = copy.copy(main_options)
         if subcmd_help is not None:
             all_options += self._get_documented_completions(
                 subcmd_help.arg_table)
@@ -130,7 +237,19 @@ def _find_possible_options(self, current_arg, opts, subcmd_help=None):
 
 
 def complete(cmdline, point):
-    choices = Completer().complete(cmdline, point)
+    # Get the profile and region args
+    args = cmdline[0:point].split()
+
+    profile = None
+    if '--profile' in args[:-2]:
+        profile = args[args.index('--profile') + 1]
+
+    region = None
+    if '--region' in args[:-2]:
+        region = args[args.index('--region') + 1]
+
+    driver = awscli.clidriver.create_clidriver(profile=profile)
+    choices = Completer(driver, region).complete(cmdline, point)
     print(' \n'.join(choices))
 
 

tests/unit/test_completer.py

@@ -345,6 +345,93 @@ def test_complete_custom_command_arguments_with_arg_already_used(self):
             '--bar', '--sse'])
 
 
+class TestProfileCompletion(BaseCompleterTest):
+    def setUp(self):
+        super(TestProfileCompletion, self).setUp()
+        commands = {
+            'subcommands': {},
+            'arguments': ['profile']
+        }
+        self.completer = Completer(
+            self.clidriver_creator.create_clidriver(commands,
+            profiles=['testprofile1', 'testprofile2', 'other']))
+
+    def test_complete_profile_empty(self):
+        self.assert_completion(self.completer, 's3 ls s3:// --profile ', [
+            'testprofile1', 'testprofile2', 'other'])
+
+    def test_complete_profile_partial_multi(self):
+        self.assert_completion(self.completer, 's3 ls s3:// --profile test', [
+            'testprofile1', 'testprofile2'])
+
+    def test_complete_profile_partial_single(self):
+        self.assert_completion(self.completer, 's3 ls s3:// --profile o', [
+            'other'])
+
+
+class TestS3PathCompletion(BaseCompleterTest):
+    def setUp(self):
+        super(TestS3PathCompletion, self).setUp()
+        commands = {
+            'subcommands': {},
+            'arguments': []
+        }
+        clidriver = self.clidriver_creator.create_clidriver(commands)
+
+        clidriver.session.create_client.return_value.list_buckets.return_value\
+            = {'Buckets': [{'Name': 'mybucket'}, {'Name': 'otherbucket'}]}
+        clidriver.session.create_client.return_value.get_paginator.return_value\
+            .paginate.return_value = [{'Contents': [], 'CommonPrefixes': []}]
+
+        self.completer = Completer(clidriver)
+
+    def test_complete_path_empty(self):
+        self.assert_completion(self.completer, 's3 ls ', [
+            's3://mybucket/', 's3://otherbucket/'])
+
+    def test_complete_path_scheme_only(self):
+        self.assert_completion(self.completer, 's3 ls s3://', [
+            '//mybucket/', '//otherbucket/'])
+
+    def test_complete_path_partial_bucket1(self):
+        self.assert_completion(self.completer, 's3 ls s3://m', [
+            '//mybucket/'])
+
+    def test_complete_path_partial_bucket2(self):
+        self.assert_completion(self.completer, 's3 ls s3://o', [
+            '//otherbucket/'])
+
+    def test_complete_path_prefix(self):
+        clidriver = self.completer.driver
+        clidriver.session.create_client.return_value.get_paginator.return_value\
+            .paginate.return_value = [{
+            'Contents': [
+                {'Key': 'key1'},
+                {'Key': 'key2'}
+            ],
+            'CommonPrefixes': [
+                {'Prefix': 'prefix1'},
+                {'Prefix': 'prefix2'}
+            ]
+        }]
+
+        self.assert_completion(self.completer, 's3 ls s3://mybucket/', [
+            '//mybucket/key1',
+            '//mybucket/key2',
+            '//mybucket/prefix1',
+            '//mybucket/prefix2'
+        ])
+
+    def test_complete_local_path(self):
+        check_output_patch = mock.patch('subprocess.check_output')
+        check_output_patch_mock = check_output_patch.start()
+        check_output_patch_mock.return_value = b'file1\nfile2\n'
+
+        self.assert_completion(self.completer, 's3 cp ', [
+            'file1', 'file2', 's3://mybucket/', 's3://otherbucket/'])
+
+        check_output_patch.stop()
+
 class MockCLIDriverFactory(object):
     def create_clidriver(self, commands=None, profiles=None):
         session = mock.Mock()
@@ -408,3 +495,7 @@ def create_argument_table(self, arguments):
             else:
                 argument_table[arg] = BaseCLIArgument(arg)
         return argument_table
+
+
+if __name__ == "__main__":
+    unittest.main()