Working on testing the server

requirements.txt

@@ -0,0 +1,23 @@
+cffi==1.17.1
+click==8.2.1
+comtypes==1.4.12
+iniconfig==2.1.0
+markdown-it-py==4.0.0
+mdurl==0.1.2
+numpy==2.3.2
+packaging==25.0
+pluggy==1.6.0
+psutil==7.0.0
+PyAudio==0.2.14
+pycaw==20240210
+pycparser==2.22
+Pygments==2.19.2
+pytest==8.4.1
+PyYAML==6.0.2
+rich==14.1.0
+scipy==1.16.1
+shellingham==1.5.4
+sounddevice==0.5.2
+typer==0.17.3
+typing_extensions==4.15.0
+wyoming==1.7.2

src/cli.py

@@ -9,15 +9,14 @@ audio_app = typer.Typer(help="Audio device operations")
 
 # Add commands to subcommands
 server_app.command("check")(server.check)
+server_app.command("test")(server.test)
 audio_app.command("list")(audio.list_devices)
 audio_app.command("test")(audio.test_device)
-audio_app.command("config")(audio.config_info)
 audio_app.command("install")(audio.install)
 
 # Register subcommands
 app.add_typer(server_app, name="server")
 app.add_typer(audio_app, name="audio")
 
-
 if __name__ == "__main__":
-    app()
+  app()

src/commands/audio.py

@@ -3,7 +3,8 @@ import numpy as np
 import os
 from typing import Optional, List
 
-from ..devices import get_audio_devices_windows, install_audio_cmdlets
+from ..devices import get_audio_devices_windows, install_audio_cmdlets, get_audio_devices_windows_from_pnp_devices, \
+  get_audio_devices_linux
 from ..core.utils import *
 from ..config import AppConfig
 
@@ -34,20 +35,49 @@ def _detect_wsl() -> bool:
   except Exception:
     return False
 
+
 def _get_device_type(instance_id: str) -> str:
   """Categorize device type based on InstanceId."""
   instance_lower = instance_id.lower()
   if '0.0.1.00000000' in instance_lower:
-    return "Input"
+    return "Recording"
   elif '0.0.0.00000000' in instance_lower:
-    return "Output"
+    return "Playback"
   else:
     return "Unknown"
 
+
+def _get_short_device_id(instance_id: str) -> str:
+  """Get device name based on InstanceId."""
+  if len(instance_id) == 68:
+    return instance_id[31:-1]
+  elif len(instance_id) == 55:
+    return instance_id[18:-1]
+  else:
+    return instance_id
+
+
+def _get_colored_bool(status: bool) -> str:
+  """Get colored status string based on status."""
+  if status:
+    return f"[green]{status}[/green]"
+  else:
+    return str(status)
+
+
+def _get_colored_status(status: str) -> str:
+  """Get colored status string based on status."""
+  if status == "Unknown":
+    return f"[red]{status}[/red]"
+  else:
+    return str(status)
+
+
 def list_devices(
     device: Optional[int] = typer.Argument(default=None, help="Show details of a device, by its Id"),
     pulse: bool = typer.Option(False, "--pulse", help="Show PulseAudio sources"),
     native: bool = typer.Option(False, "--native", help="Force native Linux view (WSL only)"),
+    all_devices: bool = typer.Option(False, "--all", help="Display all devices, even those not connected"),
     sort_info: Optional[str] = typer.Option(None, "--sort", help="Sort by column"),
     desc_info: bool = typer.Option(False, "--desc", help="Set the sorting order to descending"),
     filter_info: Optional[str] = typer.Option(None, "--filter", help="Filter by a column value. Use column=value"),
@@ -60,40 +90,61 @@ def list_devices(
   
   # Determine title based on environment and options
   is_wsl = _detect_wsl()
-  use_windows = is_wsl and not native
+  if is_wsl and not native:
-  if use_windows:
     typer.echo(typer.style("WSL detected, showing Windows audio devices (use --native for WSL view)",
                            fg=typer.colors.BLUE))
-    result = get_audio_devices_windows()
+    result = get_audio_devices_windows_from_pnp_devices() if all_devices else get_audio_devices_windows()
     if not check_result(result):
       return
     
-    windows_devices = get_results(result.stdout, {"Index": '', "ID": '', 'Name': '', 'Type': '', 'Default': ''})
+    windows_devices = get_results(result.stdout)
+    if all_devices:
+      select_conf = [
+          SelectConf(attr="Index", default=""),
+          SelectConf(attr="InstanceId", to="ID", formatter=lambda item: _get_short_device_id(item.InstanceId)),
+          SelectConf(attr="FriendlyName", to="Name"),
+          SelectConf(attr="Type", formatter=lambda item: _get_device_type(item.InstanceId)),
+          SelectConf(attr="Status", formatter=lambda item: _get_colored_status(item.Status)),
+      ]
+    else:
+      select_conf = [
+          SelectConf(attr="Index"),
+          SelectConf(attr="ID", formatter=lambda item: _get_short_device_id(item.ID)),
+          SelectConf(attr="Name"),
+          SelectConf(attr="Type"),
+          SelectConf(attr="Default", formatter=lambda item: _get_colored_bool(item.Default)),
+      ]
+    windows_devices = select(windows_devices, select_conf)
     
     # apply sorting and filtering
     windows_devices = filter_and_sort(windows_devices, filter_info, sort_info, desc_info)
     
-    display_as_table(windows_devices, [
+    display_as_table(windows_devices)
-        {"name": "Index"},
-        {"name": "ID"},
-        {"name": "Name"},
-        {"name": "Type"},
-        {"name": "Default"},
-    ])
   
   
   else:
-    linux_devices = get_linux_audio_devices()
+    if native and not is_wsl:
-    display_linux_devices(linux_devices, config, pulse, sort_config)
+      typer.echo(typer.style("Native is applicable only when WSL is detected.", fg=typer.colors.RED))
+      return
+    
+    if all_devices and native:
+      typer.echo(typer.style("All devices is not applicable with native mode.", fg=typer.colors.RED))
+      return
+    
+    result = get_audio_devices_linux()
+    if not check_result(result):
+      return
+    
+    linux_devices = result.result
+    # apply sorting and filtering
+    linux_devices = filter_and_sort(linux_devices, filter_info, sort_info, desc_info)
+    
+    display_as_table(linux_devices)
   
   # Show legend
   typer.echo(f"\nLegend:")
-  if use_windows:
+  typer.echo(typer.style("   * = Configured device", fg=typer.colors.YELLOW))
-    typer.echo(typer.style("   ✓ = Device working", fg=typer.colors.GREEN))
+  typer.echo(f"   IN/OUT = Input/Output channel count")
-    typer.echo(typer.style("   ✗ = Device problem", fg=typer.colors.RED))
-  else:
-    typer.echo(typer.style("   * = Configured device", fg=typer.colors.YELLOW))
-    typer.echo(f"   IN/OUT = Input/Output channel count")
 
 
 def install():
@@ -104,32 +155,6 @@ def install():
   typer.echo(result.stdout)
 
 
-
-
-def get_linux_audio_devices() -> list:
-  """Get Linux audio devices using sounddevice."""
-  try:
-    devices = sd.query_devices()
-    linux_devices = []
-    
-    for i, device in enumerate(devices):
-      hostapi_name = sd.query_hostapis(device['hostapi'])['name']
-      
-      linux_devices.append(LinuxAudioDevice(
-        device_id=i,
-        name=device['name'],
-        max_input_channels=device['max_input_channels'],
-        max_output_channels=device['max_output_channels'],
-        default_samplerate=device['default_samplerate'],
-        hostapi_name=hostapi_name
-      ))
-    
-    return linux_devices
-  except Exception as e:
-    typer.echo(typer.style(f"Error querying Linux audio devices: {e}", fg=typer.colors.RED, bold=True))
-    raise typer.Exit(1)
-
-
 def display_linux_devices(devices: list,
                           config: AppConfig,
                           show_pulse: bool = False,
@@ -216,6 +241,7 @@ def test_device(
     device: Optional[int] = typer.Option(None, "--device", "-d", help="Device ID to test (default: configured device)"),
     duration: float = typer.Option(3.0, "--duration", help="Recording duration in seconds"),
     save: bool = typer.Option(False, "--save", help="Save recording to WAV file"),
+    play: bool = typer.Option(False, "--play", help="Play recorded audio through default speakers"),
     config_file: Optional[str] = typer.Option(None, "--config", "-c", help="Path to config file")
 ):
   """Test audio recording from a specific device."""
@@ -230,7 +256,11 @@ def test_device(
   typer.echo("=" * 20)
   
   # Get device info
-  devices_list = get_linux_audio_devices()
+  result = get_audio_devices_linux()
+  if not check_result(result):
+    return
+  
+  devices_list = result.result
   
   if test_device_id is not None:
     if test_device_id >= len(devices_list):
@@ -284,72 +314,20 @@ def test_device(
     else:
       typer.echo(typer.style("   Status: Good signal level", fg=typer.colors.GREEN))
     
+    # Play recorded audio if requested
+    if play:
+      typer.echo(f"\n{typer.style('Playing recorded audio...', fg=typer.colors.CYAN, bold=True)}")
+      sd.play(audio_data, samplerate=config.audio.sample_rate)
+      sd.wait()
+      typer.echo(typer.style("Playback completed!", fg=typer.colors.CYAN))
+    
     # Save if requested
     if save:
       filename = f"test_device_{test_device_id or 'default'}_{int(duration)}s.wav"
-      # Note: WyomingAudioRecorder is not defined in the current code
+      from scipy.io import wavfile
-      # This would need to be implemented or the save functionality modified
+      wavfile.write(filename, config.audio.sample_rate, audio_int16)
-      typer.echo(f"   Save functionality needs to be implemented")
+      typer.echo(typer.style(f"Audio saved to: {filename}", fg=typer.colors.MAGENTA, bold=True))
   
   except Exception as e:
     typer.echo(typer.style(f"Recording failed: {e}", fg=typer.colors.RED, bold=True))
     raise typer.Exit(1)
-
-
-def config_info(
-    config_file: Optional[str] = typer.Option(None, "--config", "-c", help="Path to config file")
-):
-  """Show current audio configuration."""
-  
-  # Load configuration
-  config = AppConfig.load(config_file)
-  
-  typer.echo(typer.style("Audio Configuration", fg=typer.colors.BLUE, bold=True))
-  typer.echo("=" * 21)
-  
-  # Show current settings
-  typer.echo(f"\nCurrent settings:")
-  typer.echo(f"   Sample rate: {typer.style(f'{config.audio.sample_rate} Hz', fg=typer.colors.CYAN)}")
-  typer.echo(f"   Channels: {typer.style(str(config.audio.channels), fg=typer.colors.CYAN)}")
-  
-  if config.audio.device is not None:
-    typer.echo(f"   Device: {typer.style(str(config.audio.device), fg=typer.colors.CYAN)}")
-    
-    # Show device details
-    try:
-      devices_list = get_linux_audio_devices()
-      if config.audio.device < len(devices_list):
-        device = devices_list[config.audio.device]
-        typer.echo(f"\nConfigured device details:")
-        typer.echo(f"   Name: {device['name']}")
-        typer.echo(f"   Input channels: {device['max_input_channels']}")
-        typer.echo(f"   Default rate: {int(device['default_samplerate'])} Hz")
-        
-        if device['max_input_channels'] == 0:
-          typer.echo(typer.style("   Warning: This device has no input channels!", fg=typer.colors.RED))
-      else:
-        typer.echo(typer.style(f"   Warning: Configured device {config.audio.device} not found!",
-                               fg=typer.colors.RED, bold=True))
-    except Exception as e:
-      typer.echo(typer.style(f"   Error getting device info: {e}", fg=typer.colors.RED))
-  else:
-    typer.echo(f"   Device: {typer.style('default', fg=typer.colors.CYAN)}")
-    
-    # Show default device info
-    try:
-      default_device = sd.default.device
-      if hasattr(default_device, '__len__') and len(default_device) >= 2:
-        default_input = int(default_device[0])
-      else:
-        default_input = int(default_device)
-      
-      devices_list = get_linux_audio_devices()
-      device = devices_list[default_input]
-      typer.echo(f"\nDefault input device:")
-      typer.echo(f"   ID: {default_input}")
-      typer.echo(f"   Name: {device['name']}")
-      typer.echo(f"   Input channels: {device['max_input_channels']}")
-    except Exception as e:
-      typer.echo(typer.style(f"   Error getting default device: {e}", fg=typer.colors.RED))
-  
-  # Show configuration source info

src/commands/server.py

@@ -4,7 +4,61 @@ from contextlib import closing
 import typer
 from typing import Optional
 
+from wyoming.audio import AudioStart, AudioChunk, AudioStop
+
 from ..config import AppConfig
+import io
+import wave
+import numpy as np
+import sounddevice as sd
+import asyncio
+from wyoming.client import AsyncTcpClient
+from wyoming.asr import Transcribe, Transcript
+
+
+async def _async_transcribe(host: str, port: int, timeout: float, pcm_bytes: bytes, lang: str) -> Optional[str]:
+  """Stream raw PCM data to Wyoming ASR and return transcript text."""
+  # Instantiate the async TCP client
+  client = AsyncTcpClient(host, port)
+  
+  # Audio parameters
+  rate = 16000
+  width = 2  # 16-bit
+  channels = 1
+  
+  # The client instance is an async context manager.
+  async with client:
+    # 1. Send transcription request
+    await client.write_event(Transcribe(language=lang).event())
+    
+    # 2. Start the audio stream
+    await client.write_event(AudioStart(rate, width, channels).event())
+    
+    # 3. Send audio chunks
+    chunk_size = 2048  # A reasonable chunk size
+    for i in range(0, len(pcm_bytes), chunk_size):
+      chunk_bytes = pcm_bytes[i:i + chunk_size]
+      await client.write_event(AudioChunk(audio=chunk_bytes, rate=rate, width=width, channels=channels).event())
+    
+    # 4. Stop the audio stream
+    await client.write_event(AudioStop().event())
+    
+    # 5. Read events until a transcript arrives
+    transcript_text = None
+    try:
+      while True:
+        event = await asyncio.wait_for(client.read_event(), timeout=timeout)
+        if event is None:
+          break
+        
+        if Transcript.is_type(event):
+          tr = Transcript.from_event(event)
+          transcript_text = tr.text
+          break
+    except asyncio.TimeoutError:
+      typer.echo(typer.style("Connection timed out waiting for transcript.", fg=typer.colors.YELLOW))
+    
+    return transcript_text
 
 
 def check_wyoming_server(host: str, port: int, timeout: float = 3.0) -> tuple[bool, float | None, str | None]:
@@ -58,3 +112,66 @@ def check(
     typer.echo(f"Server: {final_host}:{final_port}")
     typer.echo(typer.style(f"Error: {error}", fg=typer.colors.RED))
     raise typer.Exit(1)
+
+
+def test(
+    duration: float = typer.Option(3.0, "--duration", help="Recording duration in seconds"),
+    lang: str = typer.Option("fr", "--lang", help="Language code: 'fr' or 'en'"),
+    host: Optional[str] = typer.Option(None, "--host", "-h", help="Wyoming server host"),
+    port: Optional[int] = typer.Option(None, "--port", "-p", help="Wyoming server port"),
+    timeout: Optional[float] = typer.Option(None, "--timeout", "-t", help="Connection timeout in seconds"),
+    config_file: Optional[str] = typer.Option(None, "--config", "-c", help="Path to config file")
+):
+  """Record from default microphone, send to Wyoming ASR server, and print transcription."""
+  # Load configuration
+  config = AppConfig.load(config_file)
+  final_host = host or config.server.host
+  final_port = port or config.server.port
+  final_timeout = timeout or config.server.timeout
+  
+  # Validate language (two-letter code)
+  lang = (lang or "fr").strip().lower()
+  if lang not in ("fr", "en"):
+    typer.echo(typer.style("Invalid --lang. Use 'fr' or 'en'.", fg=typer.colors.RED))
+    raise typer.Exit(2)
+  
+  # Check server reachability first
+  reachable, latency, err = check_wyoming_server(final_host, final_port, final_timeout)
+  if not reachable:
+    typer.echo(typer.style(f"Cannot reach Wyoming server at {final_host}:{final_port}: {err}", fg=typer.colors.RED))
+    raise typer.Exit(1)
+  
+  # Record audio (16 kHz mono float32)
+  sample_rate = 16000
+  channels = 1
+  typer.echo(typer.style("Recording...", fg=typer.colors.GREEN, bold=True))
+  try:
+    frames = int(duration * sample_rate)
+    audio = sd.rec(frames, samplerate=sample_rate, channels=channels, dtype="float32")
+    sd.wait()
+  except Exception as e:
+    typer.echo(typer.style(f"Audio recording failed: {e}", fg=typer.colors.RED))
+    raise typer.Exit(1)
+  
+  # Convert to PCM16 bytes directly, no need for WAV wrapper
+  audio_int16 = np.clip(audio.flatten() * 32767.0, -32768, 32767).astype(np.int16)
+  pcm_bytes = audio_int16.tobytes()
+  
+  # Send to Wyoming ASR (async)
+  try:
+    typer.echo(typer.style(f"Connecting to {final_host}:{final_port} (lang={lang})...", fg=typer.colors.CYAN))
+    
+    # Run the async helper
+    transcript_text = asyncio.run(
+      _async_transcribe(final_host, final_port, final_timeout, pcm_bytes, lang)
+    )
+    
+    if transcript_text:
+      typer.echo(typer.style("\nTranscription:", fg=typer.colors.GREEN, bold=True))
+      typer.echo(transcript_text)
+    else:
+      typer.echo(typer.style("No transcription received.", fg=typer.colors.YELLOW))
+  
+  except Exception as e:
+    typer.echo(typer.style(f"ASR request failed: {e}", fg=typer.colors.RED))
+    raise typer.Exit(1)

src/core/Expando.py

@@ -8,8 +8,10 @@ class Expando:
   You can then access the property using dot '.' (ex. obj.prop1.prop2)
   """
   
-  def __init__(self, props):
+  def __init__(self, props=None, **kwargs):
-    self._props = props
+    self._props = props.copy() if props else {}
+    if kwargs:
+      self._props.update(kwargs)
   
   def __getattr__(self, item):
     if item not in self._props:
@@ -21,10 +23,11 @@ class Expando:
   def __setitem__(self, key, value):
     self._props[key] = value
   
-  def get(self, path):
+  def get(self, path, default=None):
     """
     returns the value, from a string with represents the path
     :param path:
+    :param default: value to return if path is not found
     :return:
     """
     current = self._props
@@ -38,7 +41,7 @@ class Expando:
       
       else:
         if current is None or attr not in current:
-          return None
+          return default
         current = current[attr]
     
     return current

src/core/utils.py

@@ -2,7 +2,7 @@ import json
 import subprocess
 from dataclasses import dataclass
 from subprocess import CompletedProcess
-from typing import Any
+from typing import Any, Callable
 
 import typer
 from rich.console import Console
@@ -38,11 +38,26 @@ class FilterConf:
     return FilterConf(parts[0].strip(), parts[1].strip())
 
 
+@dataclass
+class SelectConf:
+  attr: str  # property nam to select
+  to: str = None  # rename the property
+  default: str = None  # value to use if property is missing
+  formatter: Callable[[Any], Any] = None  # function to apply to the property using the whole item
+
+
 @dataclass
 class ProcessResult:
   result: Any
   error: str = None
   
+  @property
+  def stderr(self):
+    return self.error
+  
+  @property
+  def returncode(self):
+    return 0 if self.result is not None else 1
 
 def sort_by(items: list[Expando], sort_conf: SortConf):
   """Sort a list of items by a given property."""
@@ -53,7 +68,6 @@ def sort_by(items: list[Expando], sort_conf: SortConf):
     # Convert None to empty string for consistent sorting
     return "" if value is None else str(value)
   
-  
   if sort_conf is None:
     return items
   
@@ -86,6 +100,23 @@ def filter_by(items, filter_conf: FilterConf):
   ]
 
 
+def select(items: list[Expando], settings: list[SelectConf]) -> list[Expando]:
+  res = []
+  
+  for item in items:
+    new_item = {}
+    for setting in settings:
+      attr = setting.attr.strip()
+      
+      key = setting.to or attr
+      value = setting.formatter(item) if setting.formatter else item.get(attr, setting.default)
+      new_item[key] = value
+    
+    res.append(Expando(new_item))
+  
+  return res
+
+
 def run_ps_command(command: str) -> CompletedProcess[str]:
   """Run a PowerShell command and return the output"""
   completed = subprocess.run(
@@ -160,7 +191,7 @@ def run_ps_command_live(command: str) -> CompletedProcess[str]:
   return completed
 
 
-def get_results(stdout: str, mappings) -> list[dict]:
+def get_results(stdout: str) -> list[Expando]:
   stripped = stdout.strip()
   if not stripped:
     typer.echo(typer.style("PowerShell returned empty output", fg=typer.colors.YELLOW))
@@ -169,15 +200,20 @@ def get_results(stdout: str, mappings) -> list[dict]:
   data = json.loads(stripped)
   as_list = data if isinstance(data, list) else [data]
   
-  res = []
+  return [Expando(item) for item in as_list]
-  for item in as_list:
-    mapped = {key: item.get(key, default_value) for key, default_value in mappings.items()}
-    res.append(Expando(mapped))
-  
-  return res
 
 
-def display_as_table(result, columns_settings: list):
+def display_as_table(result, columns_settings: list = None):
+  def _create_default_columns_settings():
+    if len(result) == 0:
+      return []
+    
+    blue_print = result[0]
+    return [{"name": attr} for attr in blue_print.as_dict().keys()]
+  
+  if columns_settings is None:
+    columns_settings = _create_default_columns_settings()
+  
   formatters = {}
   table = Table(show_header=True)
   for col in [c for c in columns_settings if "name" in c]:

src/devices.py

@@ -50,7 +50,7 @@ def get_audio_devices_windows():
   return run_ps_command(ps_script)
 
 
-def get_audio_devices_windows_from_pnp():
+def get_audio_devices_windows_from_pnp_devices():
   ps_script = "Get-PnpDevice -Class AudioEndpoint | Select-Object FriendlyName, Status, InstanceId | ConvertTo-Json"
   return run_ps_command(ps_script)
 

tests/test_expando.py

@@ -29,6 +29,10 @@ def test_i_can_get():
   assert dynamic.get("a") == 10
   assert dynamic.get("b.c") == "value"
   assert dynamic.get("unknown") is None
+  assert dynamic.get("unknown", "default") == "default"
+  assert dynamic.get("b.x") is None
+  assert dynamic.get("b.x", "default") == "default"
+  assert dynamic.get("b.x", None) is None
 
 
 def test_i_can_get_insensitive():

tests/test_select.py

@@ -0,0 +1,256 @@
+import pytest
+
+from core.utils import SelectConf, select
+from core.Expando import Expando
+
+
+def test_i_can_select_basic_attributes():
+  """Test basic selection of existing attributes."""
+  items = [
+      Expando({"name": "alice", "age": 25, "city": "paris"}),
+      Expando({"name": "bob", "age": 30, "city": "london"})
+  ]
+  settings = [
+      SelectConf(attr="name"),
+      SelectConf(attr="age")
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].name == "alice"
+  assert result[0].age == 25
+  assert not hasattr(result[0], "city")  # city not selected
+  assert result[1].name == "bob"
+  assert result[1].age == 30
+
+
+def test_i_can_select_with_renamed_attributes():
+  """Test renaming attributes using SelectConf.to."""
+  items = [
+      Expando({"name": "alice", "age": 25}),
+      Expando({"name": "bob", "age": 30})
+  ]
+  settings = [
+      SelectConf(attr="name", to="full_name"),
+      SelectConf(attr="age", to="years")
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].full_name == "alice"
+  assert result[0].years == 25
+  assert not hasattr(result[0], "name")  # original name not present
+  assert not hasattr(result[0], "age")  # original name not present
+  assert result[1].full_name == "bob"
+  assert result[1].years == 30
+
+
+def test_i_can_select_with_formatter():
+  """Test applying formatters to selected attributes."""
+  items = [
+      Expando({"name": "alice", "age": 25}),
+      Expando({"name": "bob", "age": 30})
+  ]
+  settings = [
+      SelectConf(attr="name", formatter=lambda item: item.name.upper()),
+      SelectConf(attr="age", formatter=lambda item: item.age * 2)
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].name == "ALICE"
+  assert result[0].age == 50
+  assert result[1].name == "BOB"
+  assert result[1].age == 60
+
+
+def test_i_can_select_with_formatter_and_rename():
+  """Test combining formatter and renaming."""
+  items = [
+      Expando({"name": "alice", "age": 25}),
+      Expando({"name": "bob", "age": 30})
+  ]
+  settings = [
+      SelectConf(attr="name", to="upper_name", formatter=lambda item: item.name.upper()),
+      SelectConf(attr="age", to="double_age", formatter=lambda item: item.age * 2)
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].upper_name == "ALICE"
+  assert result[0].double_age == 50
+  assert not hasattr(result[0], "name")
+  assert not hasattr(result[0], "age")
+  assert result[1].upper_name == "BOB"
+  assert result[1].double_age == 60
+
+
+def test_i_can_handle_empty_items_list():
+  """Test that empty items list returns empty list."""
+  items = []
+  settings = [SelectConf(attr="name")]
+  
+  result = select(items, settings)
+  
+  assert result == []
+
+
+def test_i_can_handle_empty_settings_list():
+  """Test that empty settings list returns items with empty properties."""
+  items = [
+      Expando({"name": "alice", "age": 25}),
+      Expando({"name": "bob", "age": 30})
+  ]
+  settings = []
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  # Each result should be an Expando with empty properties
+  assert result[0]._props == {}
+  assert result[1]._props == {}
+
+
+def test_i_can_handle_missing_attributes():
+  """Test that missing attributes return None (normal behavior)."""
+  items = [
+      Expando({"name": "alice"}),  # no age attribute
+      Expando({"name": "bob", "age": 30})
+  ]
+  settings = [
+      SelectConf(attr="name"),
+      SelectConf(attr="age")  # missing in first item
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].name == "alice"
+  assert result[0].age is None  # missing attribute returns None
+  assert result[1].name == "bob"
+  assert result[1].age == 30
+
+
+def test_i_can_handle_whitespace_in_attr_names():
+  """Test that whitespace in attribute names is stripped."""
+  items = [
+      Expando({"name": "alice", "age": 25})
+  ]
+  settings = [
+      SelectConf(attr="  name  "),  # whitespace around attr
+      SelectConf(attr="\tage\n")  # tabs and newlines
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 1
+  assert result[0].name == "alice"
+  assert result[0].age == 25
+
+
+def test_i_can_select_multiple_attributes():
+  """Test selecting multiple attributes from multiple items."""
+  items = [
+      Expando({"name": "alice", "age": 25, "city": "paris", "country": "france"}),
+      Expando({"name": "bob", "age": 30, "city": "london", "country": "uk"}),
+      Expando({"name": "charlie", "age": 35, "city": "madrid", "country": "spain"})
+  ]
+  settings = [
+      SelectConf(attr="name"),
+      SelectConf(attr="city", to="location"),
+      SelectConf(attr="country", formatter=lambda item: item.country.upper())
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 3
+  assert result[0].name == "alice"
+  assert result[0].location == "paris"
+  assert result[0].country == "FRANCE"
+  assert result[1].name == "bob"
+  assert result[1].location == "london"
+  assert result[1].country == "UK"
+  assert result[2].name == "charlie"
+  assert result[2].location == "madrid"
+  assert result[2].country == "SPAIN"
+
+
+def test_i_can_handle_formatter_with_whole_item():
+  """Test that formatter receives the whole item, not just the attribute value."""
+  items = [
+      Expando({"first_name": "alice", "last_name": "smith"}),
+      Expando({"first_name": "bob", "last_name": "jones"})
+  ]
+  settings = [
+      SelectConf(
+        attr="first_name",
+        to="full_name",
+        formatter=lambda item: f"{item.get('first_name')} {item.get('last_name')}"
+      )
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].full_name == "alice smith"
+  assert result[1].full_name == "bob jones"
+
+
+def test_i_cannot_select_when_formatter_raises_exception():
+  """Test that formatter exceptions are propagated."""
+  items = [
+      Expando({"name": "alice", "value": None})
+  ]
+  settings = [
+      SelectConf(
+        attr="value",
+        formatter=lambda item: item.get("value").upper()  # will fail on None
+      )
+  ]
+  
+  with pytest.raises(AttributeError):
+    select(items, settings)
+
+
+def test_i_can_handle_none_values_in_formatter():
+  """Test formatter handling None values gracefully when designed to do so."""
+  items = [
+      Expando({"name": "alice", "value": None}),
+      Expando({"name": "bob", "value": "test"})
+  ]
+  settings = [
+      SelectConf(
+        attr="value",
+        formatter=lambda item: item.get("value").upper() if item.get("value") else "NO_VALUE"
+      )
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].value == "NO_VALUE"
+  assert result[1].value == "TEST"
+
+
+def test_i_can_select_nested_attributes():
+  """Test selecting nested attributes using Expando.get() path notation."""
+  items = [
+      Expando({"user": {"profile": {"name": "alice"}}, "age": 25}),
+      Expando({"user": {"profile": {"name": "bob"}}, "age": 30})
+  ]
+  settings = [
+      SelectConf(attr="user.profile.name", to="name"),
+      SelectConf(attr="age")
+  ]
+  
+  result = select(items, settings)
+  
+  assert len(result) == 2
+  assert result[0].name == "alice"
+  assert result[0].age == 25
+  assert result[1].name == "bob"
+  assert result[1].age == 30