issue9:

add log_print util and add basic cli feedback

src/notsotuf/repo/cli.py

@@ -4,7 +4,9 @@
 import packaging.version
 from tuf.api.metadata import TOP_LEVEL_ROLE_NAMES
 
-from notsotuf.utils import input_bool, input_numeric, input_text, input_list
+from notsotuf.utils import (
+    log_print, input_bool, input_numeric, input_text, input_list
+)
 from notsotuf.repo import Repository
 
 logger = logging.getLogger(__name__)
@@ -32,11 +34,17 @@
 )
 
 
+def _print_info(message: str):
+    return log_print(message=message, level=logging.INFO, logger=logger)
+
+
 def _get_repo():
     try:
         return Repository.from_config()
     except TypeError:
-        print('Failed to load config. Did you initialize the repository?')
+        _print_info(
+            'Failed to load config. Did you initialize the repository?'
+        )
 
 
 def _add_key_dirs_argument(parser: argparse.ArgumentParser):
@@ -207,17 +215,18 @@ def _cmd_init(options: argparse.Namespace):
             message = 'Modifying existing configuration.'
         else:
             message = 'Using existing configuration.'
-    logger.info(message)
+    _print_info(message)
     if modify:
         config_dict = _get_config_from_user(**config_dict)
     # create repository instance
     repository = Repository(**config_dict)
     # save new or updated configuration
+    _print_info('Saving config...')
     repository.save_config()
-    logger.info('Config saved.')
     # create directories, keys, and root metadata file
+    _print_info('Initializing repository...')
     repository.initialize()
-    logger.info('Repository initialized.')
+    _print_info('Done.')
 
 
 def _cmd_keys(options: argparse.Namespace):
@@ -230,53 +239,49 @@ def _cmd_keys(options: argparse.Namespace):
         key_name=options.new_key_name
     )
     if options.create:
-        logger.info(f'Creating key pair for {options.new_key_name}...')
+        _print_info(f'Creating key pair for {options.new_key_name}...')
         repository.keys.create_key_pair(
             private_key_path=private_key_path, encrypted=options.encrypted
         )
-        logger.info(f'Key pair created.')
+        _print_info(f'Key pair created.')
     replace = hasattr(options, 'old_key_name')
     add = hasattr(options, 'role_name')
     if replace:
-        logger.info(
+        _print_info(
             f'Replacing key {options.old_key_name} by {options.new_key_name}...'
         )
         repository.replace_key(
             old_key_name=options.old_key_name,
             new_public_key_path=public_key_path,
             new_private_key_encrypted=options.encrypted,
         )
-        logger.info('Key replaced.')
     elif add:
-        logger.info(f'Adding key {options.new_key_name}...')
+        _print_info(f'Adding key {options.new_key_name}...')
         repository.add_key(
             role_name=options.role_name,
             public_key_path=public_key_path,
             encrypted=options.encrypted,
         )
-        logger.info('Key added.')
     if replace or add:
-        logger.info('Publishing changes...')
+        _print_info('Publishing changes...')
         repository.publish_changes(private_key_dirs=options.key_dirs)
-        logger.info('Changes published.')
+    _print_info('Done.')
 
 
 def _cmd_targets(options: argparse.Namespace):
     logger.debug(f'command targets: {vars(options)}')
     repository = _get_repo()
     if hasattr(options, 'app_version') and hasattr(options, 'bundle_dir'):
-        logger.info('Adding bundle...')
+        _print_info('Adding bundle...')
         repository.add_bundle(
             new_version=options.app_version, new_bundle_dir=options.bundle_dir
         )
-        logger.info('Bundle added.')
     else:
-        logger.debug('Removing latest bundle...')
+        _print_info('Removing latest bundle...')
         repository.remove_latest_bundle()
-        logger.info('Latest bundle removed.')
-    logger.info('Publishing changes...')
+    _print_info('Publishing changes...')
     repository.publish_changes(private_key_dirs=options.key_dirs)
-    logger.info('Changes published.')
+    _print_info('Done.')
 
 
 def _cmd_sign(options: argparse.Namespace):
@@ -288,15 +293,19 @@ def _cmd_sign(options: argparse.Namespace):
         if options.expiration_days.isnumeric():
             days = int(options.expiration_days)
         # change expiration date in signed metadata
+        _print_info(f'Setting expiration date {days} days from now...')
         repository.refresh_expiration_date(
             role_name=options.role_name, days=days
         )
         # also update version and expiration date for dependent roles, and sign
         # modified roles
+        _print_info('Publishing changes...')
         repository.publish_changes(private_key_dirs=options.key_dirs)
     else:
         # sign without changing the signed metadata (for threshold signing)
+        _print_info('Adding signature...')
         repository.threshold_sign(
             role_name=options.role_name,
             private_key_dirs=options.key_dirs,
         )
+    _print_info('Done.')

src/notsotuf/utils/__init__.py

@@ -1,9 +1,10 @@
 import logging
 import pathlib
 import shutil
+import sys
 from typing import List, Optional, Union
 
-logger = logging.getLogger(__name__)
+utils_logger = logging.getLogger(__name__)
 
 _INPUT_SEPARATOR = ' '
 
@@ -22,30 +23,58 @@ def remove_path(path: Union[pathlib.Path, str]) -> bool:
     try:
         if path.is_dir():
             shutil.rmtree(path=path)
-            logger.debug(f'Removed directory {path}')
+            utils_logger.debug(f'Removed directory {path}')
         elif path.is_file():
             path.unlink()
-            logger.debug(f'Removed file {path}')
+            utils_logger.debug(f'Removed file {path}')
     except Exception as e:
-        logger.error(f'Failed to remove {path}: {e}')
+        utils_logger.error(f'Failed to remove {path}: {e}')
         return False
     return True
 
 
+def log_print(message: str, logger: logging.Logger, level: int = logging.INFO):
+    """
+    Log message with specified level.
+
+    Print message too, if logger is not enabled for specified level,
+    or if logger does not have a handler that streams to stdout.
+    """
+    message_logged_to_stdout = False
+    current_logger = logger
+    while current_logger and not message_logged_to_stdout:
+        is_enabled = current_logger.isEnabledFor(level)
+        logs_to_stdout = any(
+            getattr(handler, 'stream', None) == sys.stdout
+            for handler in current_logger.handlers
+        )
+        message_logged_to_stdout = is_enabled and logs_to_stdout
+        if not current_logger.propagate:
+            current_logger = None
+        else:
+            current_logger = current_logger.parent
+    if not message_logged_to_stdout:
+        print(message)
+    logger.log(level=level, msg=message)
+
+
 def input_bool(prompt: str, default: bool) -> bool:
     true_inputs = ['y']
     default_str = ' (y/[n])'
     if default:
         default_str = ' ([y]/n)'
         true_inputs.append('')
-    return input(prompt + default_str + _INPUT_SEPARATOR) in true_inputs
+    prompt += default_str + _INPUT_SEPARATOR
+    answer = input(prompt)
+    utils_logger.debug(f'{prompt}: {answer}')
+    return answer in true_inputs
 
 
 def input_list(
         prompt: str, default: List[str], item_default: Optional[str] = None
 ) -> List[str]:
     new_list = []
-    print(prompt)
+    log_print(message=prompt, level=logging.DEBUG, logger=utils_logger)
     # handle existing items
     for existing_item in default or []:
         if input_bool(f'{existing_item}\nKeep this item?', default=True):
@@ -60,8 +89,10 @@ def input_list(
 def input_numeric(prompt: str, default: int) -> int:
     answer = 'not empty, not numeric'
     default_str = f' (default: {default})'
+    prompt += default_str + _INPUT_SEPARATOR
     while answer and not answer.isnumeric():
-        answer = input(prompt + default_str + _INPUT_SEPARATOR)
+        answer = input(prompt)
+        utils_logger.debug(f'{prompt}: {answer}')
     if answer:
         return int(answer)
     else:
@@ -77,6 +108,7 @@ def input_text(
     prompt += _INPUT_SEPARATOR
     while not answer:
         answer = input(prompt) or default
+        utils_logger.debug(f'{prompt}: {answer}')
         if optional:
             break
     return answer