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[release/v7.6.7] Allow user to force the default implicit formatting to use AutoSize - #28096
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Dongbo Wang (daxian-dbw) merged 1 commit intoSep 24, 2026
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…PowerShell#28018) When `$PSStyle.AutoSizeDefaultFormatting = $true`, the default implicit formatting applied by PowerShell (via `Out-Default`) will enforce `AutoSize` when the chosen formatting view is `table` or `wide`, similar to running `Format-Table -AutoSize` and `Format-Wide -AutoSize` explicitly. The `List` and `Complex` views formatting won't be buffered though -- they will continue to be streamed. This allows PowerShell to generate less verbose output when used by an agent. It also makes PowerShell works better with small-window terminal.
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Copilot review overview
🟡 Changes recommended
The fallback path drops formatting parameters, preventing AutoSize for objects without registered format views.
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Review effort: Lite
Findings: 1
What changed in this PR
Backports opt-in $PSStyle.AutoSizeDefaultFormatting support for implicit table and wide formatting while preserving streaming for list and complex views.
Changes:
- Adds the new PSStyle setting and default display property.
- Applies
AutoSizeduring default formatting. - Adds formatting and streaming tests.
| File | Summary |
|---|---|
test/powershell/engine/Formatting/PSStyle.Tests.ps1 |
Tests the new setting and formatting behavior. |
src/System.Management.Automation/FormatAndOutput/format-default/format-default.cs |
Applies the AutoSize override; the fallback path requires correction. |
src/System.Management.Automation/FormatAndOutput/DefaultFormatters/PowerShellCore_format_ps1xml.cs |
Displays the new PSStyle property. |
src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs |
Defines the new setting. |
src/System.Management.Automation/FormatAndOutput/common/FormatViewGenerator.cs |
Restricts AutoSize to table and wide views. |
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Aditya Patwardhan (adityapatwardhan)
approved these changes
Sep 24, 2026
Dongbo Wang (daxian-dbw)
merged commit Sep 24, 2026
4bb1dc6
into
PowerShell:release/v7.6.7
36 checks passed
Dongbo Wang (daxian-dbw)
deleted the
backport/release/v7.6.7/28018-2179219c8
branch
September 24, 2026 22:04
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Backport of #28018 to release/v7.6.7
Triggered by Dongbo Wang (@daxian-dbw) on behalf of Dongbo Wang (@daxian-dbw)
Original CL Label: CL-General
/cc @PowerShell/powershell-maintainers
Impact
REQUIRED: Choose either Tooling Impact or Customer Impact (or both). At least one checkbox must be selected.
Tooling Impact
Customer Impact
Adds a new
$PSStyle.AutoSizeDefaultFormattingsetting. When set to$true, PowerShell's default implicit formatting (viaOut-Default) will enforceAutoSizefor table/wide views, matchingFormat-Table -AutoSize/Format-Wide -AutoSizebehavior. This lets users get less verbose, better-fitting output in small terminal windows or when consumed by an agent, without needing to explicitly pipe to Format-Table/Format-Wide.Regression
REQUIRED: Check exactly one box.
This is not a regression.
Testing
Original PR added a test verifying that List and Complex view formatting remain streamed (not buffered) even with AutoSizeDefaultFormatting enabled. Backport verified by confirming the cherry-pick applied cleanly with no conflicts on release/v7.6.7.
Risk
REQUIRED: Check exactly one box.
Medium risk: adds new opt-in formatting behavior gated behind a new $PSStyle property that defaults to off, so existing behavior is unchanged unless a user explicitly opts in. List and Complex views remain streamed (unbuffered), limiting the scope of the change.