List last commit dates for a large number of files, quickly

Question

I would like to list the last commit date for a large number of files in a git repository.

For the sake of concreteness, let us assume that I want t

Answer 1

Here is a Powershell function

function Get-GitRevisionDates($Path='.', $Ext='.md')
{
    [array] $log = git --no-pager log --format=format:%ai --name-only $Path

    $date_re = "^\d{4}-\d\d-\d\d \d\d:\d\d:\d\d .\d{4}$"
    [array] $dates = $log | Select-String $date_re | select LineNumber, Line

    $files = $log -notmatch "^$date_re$" | ? { $_.EndsWith($Ext) } | sort -unique

    $res = @()
    foreach ($file in $files) {
        $iFile = $log.IndexOf($file) + 1
        $fDate = $dates | ? LineNumber -lt $iFile | select -Last 1
        $res += [PSCustomObject]@{ File = $file; Date = $fDate.Line }
    }

    $res | sort Date -Desc
}