替换字符串匹配后的下两行

Question

我目前正在编写一个脚本，该脚本应该根据用户的选择替换文件中匹配字符串后的两行。

我要编辑的文件看起来像这样:

[default]
string_a=sadasdasdas
string_b=dasdasdasdas
[profile1]
string_a=xxxxxx
string_b=xsaassaasas
[profile2]
string_a=yyyyyyy
string_b=yaayayayaya

我想总是重写string_a &[default]后面的String_b。请注意，[default]也可以位于文件的最底部，因此我不能只计算行数，而不是静态的

用户可以选择(在本例中)profile 1 &资料2。在他选择了例如profile 2, string_a &profile2的String_b应该替换为string_a &

我现在的代码是这样的:

$filePath = './credentials'
$fileContent =  Get-Content $filePath
$profiles = [regex]::Matches($fileContent, '[(.*?)]') |ForEach-Object { $_.Groups[1].Value }
Write-Host "Following profiles found: "
for ($i=0; $i -lt $profiles.length; $i++){
Write-Host $i"." $profiles[$i] 
}
$userInput = Read-Host "Which profile set to default? "
Write-Host $profiles[$userInput]
$fileContent | Select-String $profiles[$userInput] -Context 1,2 | ForEach-Object {
$stringA =  $_.Context.PostContext[0]
$stringB =  $_.Context.PostContext[1]
#At this point I have access to the both string´s I want to replace the string´s of the default profile
# I could do this, but then I still have the old lines in the file...
# So the following code is not an option.
$NewContent = Get-Content -Path $filePath |
ForEach-Object {
# Output the existing line to pipeline in any case
$_
# If line matches regex
if($_ -match ('^' + [regex]::Escape('[default]')))
{
# Add output additional line
$stringA
$stringB
}
}
# Write content of $NewContent varibale back to file
$NewContent | Out-File -FilePath $filePath -Encoding Default -Force
}

示例输出文件，以防用户选择profile1作为新的默认

[default]
string_a=xxxxxx
string_b=xsaassaasas
[profile1]
string_a=xxxxxx
string_b=xsaassaasas
[profile2]
string_a=yyyyyyy
string_b=yaayayayaya

希望这不是很明显，但因为这是我的第一个真正的powershell脚本，我还不能找到一个解决我的问题的方法。

任何帮助将是伟大的!

感谢

Answer 1

示例:

# This is sample data
$lines = @(@'
[default]
string_a=sadasdasdas
string_b=dasdasdasdas
[profile1]
string_a=xxxxxx
string_b=xsaassaasas
[profile2]
string_a=yyyyyyy
string_b=yaayayayaya
'@ -split "`r`n")
# In real world use: 
# $encoding = [System.Text.Encoding]::ASCII
# $lines = [System.IO.File]::ReadAllLines($path, $encoding)
#Read file
$lines = $lines | ForEach-Object { $_.Trim()} # Trim spaces
$sections = @{}
$currentSection = $null
$hasErrors = $false
$lines | ForEach-Object {
if ([String]::IsNullOrWhiteSpace($_)) {
#ignore
} elseif ($_.StartsWith('[') -and $_.EndsWith(']') ) {
$currentSection = $_.Substring($_.IndexOf('[') + 1, $_.LastIndexOf(']') - 1)
$sections[$currentSection] = @{}
} elseif ($sections.ContainsKey($currentSection)) {
$PVPair = [String[]]$_.Split('=',2)
if ($PVPair.Count -eq 2) {
$sections[$currentSection][$PVPair[0]] = $PVPair[1]
} else {
Write-Warning -Message "Wrong line format [$($_)]"
$hasErrors = $true
}
} else {
Write-Warning -Message "Unexpected behaviour on section $currentSection, line $($_)"
$hasErrors = $true
}
}
if ($hasErrors) {
Write-Error -Message 'Errors occured'
return
}
# Choice
$choice = $null
$choiceVariants = @($sections.Keys | Where-Object { $_ -ne 'default' })
while ($choiceVariants -notcontains $choice) {
Write-Host "Choose between $($choiceVariants -join ',')"
$choice = $choiceVariants | Out-GridView -Title 'Choose variant' -OutputMode Single 
#Alternative: $choice = Read-Host -Prompt "Your choice"
}
Write-Host -ForegroundColor Yellow "You choose $($choice)"
# Change
$sections[$choice]['string_a'] = $sections['default']['string_a']
$sections[$choice]['string_b'] = 'newXSAA'
# Output
$outputLines = $sections.Keys | ForEach-Object {
$sectionName = $_
Write-Output "[$sectionName]"
$sections[$sectionName].Keys | ForEach-Object {
Write-Output "$_=$($sections[$sectionName][$_])"
}
}
# This is sample output
$outputLines | % { Write-Host $_ -f Magenta }
# In Real world:
# [System.IO.File]::WriteAllLines($path, $outputLines, $encoding)