The `table-no-truncate` output format emits YAML documents for `list` subcommands

[michaeltlombardi]

Prerequisites

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Summary

While documenting the new table-no-truncate value for the --output-format option of the dsc extension list and dsc function list subcommands I discovered that DSC doesn't emit a table at all - instead, it emits a series of YAML documents with the --- separator between each item.

I suspect this is caused by the last if statement in the following lines:

DSC/dsc/src/subcommand.rs

Lines 684 to 697 in 0b07d11

	fn list_functions(functions: &FunctionDispatcher, function_name: Option<&String>, output_format: Option<&ListOutputFormat>) {
	let mut write_table = false;
	let mut table = Table::new(&[
	t!("subcommand.tableHeader_functionCategory").to_string().as_ref(),
	t!("subcommand.tableHeader_functionName").to_string().as_ref(),
	t!("subcommand.tableHeader_minArgs").to_string().as_ref(),
	t!("subcommand.tableHeader_maxArgs").to_string().as_ref(),
	t!("subcommand.tableHeader_argTypes").to_string().as_ref(),
	t!("subcommand.tableHeader_description").to_string().as_ref(),
	]);
	if output_format.is_none() && io::stdout().is_terminal() {
	// write as table if format is not specified and interactive
	write_table = true;
	}

DSC/dsc/src/subcommand.rs

Lines 785 to 797 in 0b07d11

	let mut write_table = false;
	let mut table = Table::new(&[
	t!("subcommand.tableHeader_type").to_string().as_ref(),
	t!("subcommand.tableHeader_kind").to_string().as_ref(),
	t!("subcommand.tableHeader_version").to_string().as_ref(),
	t!("subcommand.tableHeader_capabilities").to_string().as_ref(),
	t!("subcommand.tableHeader_adapter").to_string().as_ref(),
	t!("subcommand.tableHeader_description").to_string().as_ref(),
	]);
	if format == Some(&ListOutputFormat::TableNoTruncate) || (format.is_none() && io::stdout().is_terminal()) {
	// write as table if format is not specified and interactive
	write_table = true;
	}

For both list_extensions() and list_functions() the code only sets write_table to true when the user doesn't specify --output-format and stdout isn't being redirected or captured.

To fix this error, I think the code would need to be something like:

let write_table = if matches!(format, Some(ListOutputFormat::TableNoTruncate)) {
    // write as table if user specified the table format
    true
} else {
    // write as table if format is not specified and interactive
    format.is_none() && io::stdout().is_terminal()
};
let mut table = Table::new(&[
    t!("subcommand.tableHeader_type").to_string().as_ref(),
    t!("subcommand.tableHeader_version").to_string().as_ref(),
    t!("subcommand.tableHeader_capabilities").to_string().as_ref(),
    t!("subcommand.tableHeader_description").to_string().as_ref(),
]);

And we can drop the if statement from the current code.

Steps to reproduce

1. Invoke the following commands:

   dsc extension list --output-format table-no-truncate
   dsc function list --output-format table-no-truncate

Expected behavior

dsc extension list --output-format table-no-truncate

Type                             Version  Capabilities  Description                                              
-----------------------------------------------------------------------------------------------------------------
Microsoft.PowerShell/Discover    0.1.0    d--           Discovers DSC resources packaged in PowerShell 7 modules.
Microsoft.Windows.Appx/Discover  0.1.0    d--           Discovers DSC resources packaged as Appx packages.

Actual behavior

dsc extension list --output-format table-no-truncate

type: Microsoft.PowerShell/Discover
version: 0.1.0
capabilities:
- discover
import: null
path: C:\code\dsc\dsc-pr-review\bin\debug\powershell.dsc.extension.json
deprecation_message: null
description: Discovers DSC resources packaged in PowerShell 7 modules.
directory: C:\code\dsc\dsc-pr-review\bin\debug
author: null
manifest:
  $schema: https://aka.ms/dsc/schemas/v3/bundled/resource/manifest.json
  type: Microsoft.PowerShell/Discover
  version: 0.1.0
  condition: '[not(equals(tryWhich(''pwsh''), null()))]'
  description: Discovers DSC resources packaged in PowerShell 7 modules.
  discover:
    executable: pwsh
    args:
    - -NoLogo
    - -NonInteractive
    - -ExecutionPolicy
    - Bypass
    - -NoProfile
    - -Command
    - ./powershell.discover.ps1
  import: null
  importParameters: null
  secret: null

---
type: Microsoft.Windows.Appx/Discover
version: 0.1.0
capabilities:
- discover
import: null
path: C:\code\dsc\dsc-pr-review\bin\debug\appx.dsc.extension.json
deprecation_message: null
description: Discovers DSC resources packaged as Appx packages.
directory: C:\code\dsc\dsc-pr-review\bin\debug
author: null
manifest:
  $schema: https://aka.ms/dsc/schemas/v3/bundled/resource/manifest.json
  type: Microsoft.Windows.Appx/Discover
  version: 0.1.0
  description: Discovers DSC resources packaged as Appx packages.
  discover:
    executable: powershell
    args:
    - -NoLogo
    - -NonInteractive
    - -ExecutionPolicy
    - Bypass
    - -NoProfile
    - -Command
    - ./appx-discover.ps1
  import: null
  importParameters: null
  secret: null

Error details

Environment data

Name                           Value
----                           -----
PSVersion                      7.6.2
PSEdition                      Core
GitCommitId                    7.6.2
OS                             Microsoft Windows 10.0.26200
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.4
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Version

3.2.0

Visuals

No response

[SteveL-MSFT]

@michaeltlombardi do you have to submit a PR to fix this?