Script that runs through the git commit log and gets the number of additions and deletions made by date. Run the script in the folder of a git repository. See sampleoutput.csv for, errr, sample output

gitChangeStatsByDay.ps1

# Not the best written script in the world but it does a job.

Param(
    [string]$path="stats.csv"
)
$commitHashes = git log --pretty=format:"%h"
$commitDates = git log --pretty=format:"%ad" --date=short
$deletions = @()
$additions = @()
$changesOverTime = @()

for ($i=0; $i -lt $commitHashes.Length-1; $i++)
{
    $changes = (git diff --numstat $commitHashes[$i] $commitHashes[$i+1]) | Out-String
    $changes = $changes.Replace("`r","").Split("`n")
    $commitDeletions = 0
    $commitAdditions = 0
    for ($ic=0; $ic -lt $changes.Length-1; $ic++)
    {
        $changeLine = $changes[$ic]
        $components = $changeLine.Split("`t",[System.StringSplitOptions]::RemoveEmptyEntries)
        if ($components[0] -ne "-")
        {
            $commitDeletions = $commitDeletions + $components[0]
        }
        if ($components[1] -ne "-")
        {
            $commitAdditions = $commitAdditions + $components[1]
        }
    }
    $summary = @{
        date = $commitDates[$i]
        additions = $commitAdditions
        deletions = $commitDeletions
    }
    $changesOverTime += $summary
}

# Sure you could use the PS group command if you were a bit more competent with PS than I!
$groupedByDate = @{}
for($i = 0; $i -lt $changesOverTime.Length; $i++)
{
    $dt = $changesOverTime[$i].date
    if ($groupedByDate.ContainsKey($dt))
    {
        $groupedByDate[$dt].additions += $changesOverTime[$i].additions
        $groupedByDate[$dt].deletions += $changesOverTime[$i].deletions
    }
    else
    {
        
        $groupedByDate[$dt] = New-Object PSObject -Property @{
            date = $dt
            additions = $changesOverTime[$i].additions
            deletions = $changesOverTime[$i].deletions
        }
    }
}
$groupedByDate.Values | Sort-Object date | export-csv -Path $path -NoTypeInformation

sampleoutput.csv