从 Powershell 中的命令输出中拆分字符串

Question

我使用 Perforce，在取消搁置后经常会有许多本地更改，我想将其删除。使用 PowerShell，我可以打印出我想要删除的文件，但输出字符串仍然包含我想要删除的子字符串。

Get-ChildItem -Recurse -Include ("*.uasset", "*.umap") -Attributes !ReadOnly "C:\Unreal\Project\Content" | ForEach-Object {p4 have $_.FullName}

这会将我仅在本地拥有的文件输出为“C:\Unreal\Project\File.uasset - 文件不在客户端”。和其他“//Project/Content/File.uasset#12 - C:\Unreal\Project\File.uasset”

我想删除客户端上没有的文件，而另一个运行

p4 sync

，但目前即使让 Write-Host 仅使用本地路径输出也卡住了。

我尝试使用 Select-String 过滤输出，然后尝试仅输出类似的路径

Get-ChildItem -Recurse -Include ("*.uasset", "*.umap") -Attributes !ReadOnly "C:\Unreal\Project\Content" | ForEach-Object {p4 have $_.FullName} | Select-String " not on client." | Write-Host ($_ -split ' - file(s)')[0]

完整字符串“C:\Unreal\Project\File.uasset - 文件不在客户端。”仍然被打印

还尝试像这样在循环内进行过滤

Get-ChildItem -Recurse -Include ("*.uasset", "*.umap") -Attributes !ReadOnly "C:\Unreal\Project\Content" | ForEach-Object { if ((p4 have $_.FullName) -like "*not on client." { Write-Host ($_ -split ' - file(s)')[0] } }

再次将完整字符串打印到终端。

我尝试过像

$_.Split(' - file(s)', 2)[0]

这样的拆分变体，但仍然打印出完整的字符串。为了确保这一点，如果 split 将完整字符串作为第一个索引，然后得到 split 结果，我尝试了不同的索引。

未过滤输出示例

> Get-ChildItem -Recurse -Include ("*.uasset", "*.umap") -Attributes !ReadOnly "C:\Unreal\Project\Content" | ForEach-Object {p4 have $_.FullName}
C:\Unreal\Project\Content\Example_01.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_02.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_03.uasset - file(s) not on client.
//Project/Content/Example_04.uasset#11 - C:\Unreal\Project\Content\Example_04.uasset
//Project/Content/Example_05.uasset#6 - C:\Unreal\Project\Content\Example_05.uasset
//Project/Content/Example_06.uasset#1 - C:\Unreal\Project\Content\Example_06.uasset
//Project/Content/Example_07.umap#7 - C:\Unreal\Project\Content\Example_07.umap
//Project/Content/Example_08.umap#73 - C:\Unreal\Project\Content\Example_08.umap
C:\Unreal\Project\Content\Example_09.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_10.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_11.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_12.uasset - file(s) not on client.
C:\Unreal\Project\Content\Example_13.uasset - file(s) not on client.

我猜你还可以注意到，p4 命令会将“文件不在客户端”打印到 stderr，因为这是一个错误/警告 - 在我放弃 powershell 并在 python 中完成后发现的。

Answer 1

凝聚大家的努力：

# Get the files
Get-ChildItem -Recurse -Include ('*.uasset', '*.umap') -Attributes !ReadOnly 'C:\Unreal\Project\Content' |
    # run "p4 have" on every file
    # we are only interested in the results sent to stdErr\Error Stream, so redirect it to stdOut\Success Stream
    ForEach-Object { p4 have $_.FullName 2>&1 } | 
    # Filter keeping only the ones we need
    Where-Object { $_ -like '*not on client.' } | 
    # for each string, remove the undesidered parts(everything after the filename)
    ForEach-Object { $_.Substring($_.IndexOf(' - file(s)')) }

它返回带有完整路径的文件名字符串数组