Outputs the Git configuration grouped by sections and sorted.

Format-GitConfig.ps1

<#
.DESCRIPTION
    Formats and outputs the Git configuration in a structured manner.
.EXAMPLE
    .\Format-GitConfig.ps1
    Outputs the Git configuration grouped by sections and sorted.
#>
$config = foreach ($line in git.exe --no-pager config --global --list | Sort-Object -Unique) {
    if ($line -match '^\s*(?<section>\w*)\.(?<subsection>\w*)\.(?<key>\w*)\s*=\s*(?<value>.+)') {
        # e.g. difftool.winmerge.name=WinMerge
        [PSCustomObject]@{
            Section    = $matches['section']
            Subsection = $matches['subsection']
            Key        = $matches['key']
            Value      = $matches['value']
        }
    }
    elseif ($line -match '^\s*(?<section>\w*)\.(?<key>\w*)\s*=\s*(?<value>.+)') {
        # e.g. color.ui=auto
        [PSCustomObject]@{
            Section    = $matches['section']
            Subsection = $null
            Key        = $matches['key']
            Value      = $matches['value']
        }
    }
    else {
        Write-Warning "Invalid line? $line"
    }

}

# $config | Sort-Object Section, Variable | Format-List; return

foreach ($line in $config | Group-Object -Property Section, SubSection | Sort-Object Name) {
    $section, $subsection = $line.Group[0].Section, $line.Group[0].Subsection
    if ($subsection) {
        "[$section ""$subsection""]"
    }
    else {
        "[$section]"
    }
    foreach ($item in $line.Group) {
        "`t{0} = {1}" -f $item.Key, $item.Value
    }
}