Powershell -需要检查名称是否以符号结尾

Question

我的脚本从TFS读取一个路径，并向其中添加一个字符串，但在需要验证路径是否包含一个符号之前。

Example1:这就是路径，在本例中，我需要添加'/database/‘

$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22

Example2:我只需要添加“数据库/”

$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/

Example3:我需要加上/

$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database

我们的目标是继续使用path/database/所以我需要先检查路径，然后添加或删除‘数据库’字符串--任何人都可以帮助我吗？

Answer 1

如果我正确地理解了这个问题，您需要检查来自TFS的路径是否以正斜杠结尾，这样您就知道应该追加什么，因此您可以使用这样的小助手函数：

function Join-TFSPath {
    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]
        [ValidateNotNullOrEmpty()]
        [string] $Path,
        [parameter(Mandatory = $false, Position = 1)]
        [string[]] $ChildPath,
        [char]$Separator = '/'
    )
    if ($ChildPath.Count) {
        "{0}$separator{1}$Separator" -f $Path.TrimEnd("\/"),
                                        (($ChildPath | ForEach-Object { $_.Trim("\/") } | 
                                          Where-Object { $_ -match '\S' }) -join $Separator)
    }
    else {
        "{0}$separator" -f $Path.TrimEnd("\/")
    }
}


# test if you need to add `database` or not

$tfsPath = '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database'
$folder  = 'database'

if (($tfsPath.TrimEnd("\/") -split '[\\/]')[-1] -ne $folder) {
    # use the function adding the $folder as ChildPath
    Join-TFSPath -Path $tfsPath -ChildPath $folder
}
else {
    # use the function without specifying the ChildPath so it will only ensure it 
    # ends with the chosen (or in this case default) separator character
    Join-TFSPath -Path $tfsPath
}

根据您的评论，您也许可以使用更专用的助手函数，例如：

function Append-TFSPath {
    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]
        [ValidateNotNullOrEmpty()]
        [string] $Path,
        [parameter(Mandatory = $false, Position = 1)]
        [string] $ChildPath = 'database',
        [char]$Separator = '/'
    )
    $Path = $Path -replace '[\\/]+$'  # trim off final slash(es)
    $ChildPath = $ChildPath -replace '^[\\/]|[\\/]$' -replace '\\', $Separator
    if ([string]::IsNullOrWhiteSpace($ChildPath) -or ($Path -replace '\\', $Separator) -like "*$ChildPath") {
        "{0}$separator" -f $Path
    }
    else {
        "{0}$separator{1}$Separator" -f $Path, $ChildPath
    }
}

然后，只需按收到的方式发送路径到函数，它就会返回您想要的路径。

$tfsPath = '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database'
$folder  = 'V8.6.22/database'

Append-TFSPath -Path $tfsPath -ChildPath $folder
# because 'database' is the default value for the ChildPath parameter, you can leave that out:
# Append-TFSPath -Path $tfsPath

测试案例：

Append-TFSPath -Path '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22'
Append-TFSPath -Path '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/'
Append-TFSPath -Path '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database'
Append-TFSPath -Path '$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database/'

都会返回$/Idu Client-Server/CoreBranches/V6.4/Patches/V8.6.22/database/吗