Shuery
8a0924330a
整个 TUI 的地基：位置、对齐、边框都靠它。而它算错了**不会报错** —— 表现只是菜单右边框歪一点、光标偏一列，所以每条边界都在断言里钉住。 为什么必须自己算：.Length 是 UTF-16 code unit 的个数（汉字 1 个 char、2 列）；而 $Host.UI.RawUI.LengthInBufferCells 在 PowerShell 7 上对、在 5.1 上错（实测 中文 返回 2、字体边框字符 返回 6），且不抛错 —— 这种"一边对一边错"的 API 比两边都错更危险。 表里三个边界是实测踩过的：半角片假名 U+FF61–FF9F 是 1 列（不能划进全角区）；全角拉丁 U+FF00–FF60 是 2 列；emoji 是代理对，按一个码点算。 验收：断言 8 条（含空串与控制字符）；test.ps1 9/9 全绿（5.1 与 7）。
38 lines
3.5 KiB
PowerShell
38 lines
3.5 KiB
PowerShell
param([Parameter(Mandatory=$true)][string]$OutFile)
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$lines = New-Object System.Collections.Generic.List[string]
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function L($s) { $lines.Add($s) }
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L ("PSVersion: " + $PSVersionTable.PSVersion + " PSEdition: " + $PSVersionTable.PSEdition)
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L ""
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L "### (1) can the host be asked whether it wants VT? ###"
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$p = $Host.UI | Get-Member -Name SupportsVirtualTerminal -MemberType Property -ErrorAction SilentlyContinue
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L (" [bool](`$Host.UI | Get-Member -Name SupportsVirtualTerminal) = " + [bool]$p + " (a REAL property, not a stub)")
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$rw = $Host.UI.RawUI | Get-Member -Name SupportsVirtualTerminal -MemberType Property -ErrorAction SilentlyContinue
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L (" [bool](`$Host.UI.RawUI | Get-Member -Name SupportsVirtualTerminal) = " + [bool]$rw + " (does NOT exist on RawUI)")
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L (" value of `$Host.UI.SupportsVirtualTerminal = " + [string]$Host.UI.SupportsVirtualTerminal)
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L (" property TypeName: " + $(if ($p) { $p.Definition } else { 'n/a' }))
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L ""
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L "### (2) is it WRITABLE? (the documented way to turn VT off: `$Host.UI.SupportsVirtualTerminal = `$false) ###"
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$before = [string]$Host.UI.SupportsVirtualTerminal
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try { $Host.UI.SupportsVirtualTerminal = $false; $setOk = $true } catch { $setOk = $false; L (" setter THREW: " + $_.Exception.Message) }
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if ($setOk) { L (" set `$false -> value is now [" + [string]$Host.UI.SupportsVirtualTerminal + "] (before [$before])") }
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try { $Host.UI.SupportsVirtualTerminal = $true } catch {}
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L (" restored -> value is now [" + [string]$Host.UI.SupportsVirtualTerminal + "]")
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L ""
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L "### (3) WIDTH / HEIGHT REPORTING WHEN THERE IS NO CONSOLE (scheduled-task-like) ###"
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L (" [Console]::IsOutputRedirected = " + [Console]::IsOutputRedirected)
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try { L (" [Console]::WindowWidth = " + [Console]::WindowWidth) } catch { L (" [Console]::WindowWidth THREW: " + $_.Exception.Message) }
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try { L (" [Console]::BufferWidth = " + [Console]::BufferWidth) } catch { L (" [Console]::BufferWidth THREW: " + $_.Exception.Message) }
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try { L (" `$Host.UI.RawUI.WindowSize = " + $Host.UI.RawUI.WindowSize.Width + 'x' + $Host.UI.RawUI.WindowSize.Height + " <-- WRONG/hidden console, does not throw") } catch { L (" RawUI.WindowSize THREW: " + $_.Exception.Message) }
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try { [Console]::SetCursorPosition(2, 2); L " [Console]::SetCursorPosition = OK" } catch { L (" [Console]::SetCursorPosition THREW: " + $_.Exception.Message) }
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try { $c = New-Object System.Management.Automation.Host.Coordinates 2, 2; $Host.UI.RawUI.CursorPosition = $c; L (" `$Host.UI.RawUI.CursorPosition = OK -> " + $Host.UI.RawUI.CursorPosition.X + ',' + $Host.UI.RawUI.CursorPosition.Y) } catch { L (" RawUI.CursorPosition setter THREW: " + $_.Exception.Message) }
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L ""
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L "### (4) EXIT CODE PATH (the two entry scripts end with exit <code>) ###"
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L (" `$LASTEXITCODE before = " + $LASTEXITCODE)
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L " (run: powershell -File x.ps1 ; echo %ERRORLEVEL%)"
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L "### (5) [Console]::ReadKey / RawUI.ReadKey availability ###"
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try { L (" `$Host.UI.RawUI.KeyAvailable = " + $Host.UI.RawUI.KeyAvailable) } catch { L (" RawUI.KeyAvailable THREW: " + $_.Exception.Message) }
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try { L (" [Console]::KeyAvailable = " + [Console]::KeyAvailable) } catch { L (" [Console]::KeyAvailable THREW: " + $_.Exception.Message) }
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L (" RawUI members: " + (($Host.UI.RawUI | Get-Member -MemberType Property,Method | Select-Object -ExpandProperty Name) -join ','))
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[System.IO.File]::WriteAllLines($OutFile, $lines, (New-Object System.Text.UTF8Encoding($false)))
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Write-Host ("[vt-probe {0}] wrote {1}" -f $PSVersionTable.PSVersion, $OutFile) -ForegroundColor Yellow
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