PowerShell custom prompt with some informations about GIT commits, npm and node version. More details on https://melma.pl/blog/powershell-prompt-i-git/

Microsoft.PowerShell_profile.ps1

function Write-Date {
    $date = Get-Date -Format "dddd MM/dd/yyyy HH:mm"
    Write-Host "$date " -BackgroundColor "black" -ForegroundColor "yellow"
}

# Print current version of node.js
function Write-NodeVer {
  # This try gracefully handles when node isn't available
  try {
    $iconNode = "" # icon node
    $verNode = node -v
    Write-Host " $iconNode $verNode " -NoNewline -BackgroundColor "green" -ForegroundColor "black"
  }
  catch {}
}

# Print current version of npm
function Write-NpmVer {
  # This try gracefully handles when npm isn't available
  try {
    $iconNpm = "" # icon npm
    $verNpm = npm -v
    Write-Host " $iconNpm v$verNpm " -NoNewline -BackgroundColor "red" -ForegroundColor "black"
  }
  catch {}
}

# Print GIT branch and changes
function Write-GitInfo () {
    try {

        $iconBranch = "" # icon branch
        $iconAhead = "" # icon arrow up
        $iconBehind = "" # icon arrow down

        $branch = git rev-parse --abbrev-ref HEAD
        
        Write-Host "`n" -NoNewline

        if ($branch -eq "HEAD") {
            # we're probably in detached HEAD state, so print the SHA
            $branch = git rev-parse --short HEAD
            Write-Host "$iconBranch $branch" -NoNewline -ForegroundColor "red"
        }
        else {
            # we're on an actual branch, so print it
            Write-Host "$iconBranch $branch" -NoNewline -ForegroundColor "blue"
        }

        Write-Host " [" -NoNewline -ForegroundColor "blue"

        $ahead = $(git rev-list --count origin/$branch..$branch)
        $behind = $(git rev-list --count $branch..origin/$branch)

        if ($ahead -gt 0) {
            Write-Host " $iconAhead $ahead " -NoNewline -ForegroundColor "green"
        }
        if ($behind -gt 0) {
            Write-Host " $iconBehind $behind " -NoNewline -ForegroundColor "red"
        }

        Write-GitChangesInfo

        Write-Host "]" -NoNewline -ForegroundColor "blue"

    } catch {
        # we'll end up here if we're in a newly initiated git repo
        Write-Host "`n$iconBranch no branches yet" -NoNewline -ForegroundColor "yellow"
    }
}

# Function which prints all changes in git repository
function Write-GitChangesInfo () {

    $iconRemoved = "✗" # icon cross
    $iconAdded = "✚" # icon plus
    $iconModified = "" # icon pencil ✎
    $iconUntracked = "…" # icon ellipsis
    $iconUncommitted = "" # icon arrow up
    $iconNoChanges = "✓" # icon checkmark

    $gitStatusList = git status --porcelain

    $ModifiedFilesCount = $gitStatusList | Where {$_ -match '^ M'} | Measure-Object | Select-Object -expand Count
    $AddedFilesCount = $gitStatusList | Where {$_ -match '^A'} | Measure-Object | Select-Object -expand Count
    $RemovedFilesCount = $gitStatusList | Where {$_ -match '^D'} | Measure-Object | Select-Object -expand Count
    $UntrackedFilesCount = $gitStatusList | Where {$_ -match '^\?\?'} | Measure-Object | Select-Object -expand Count
    
    # Show only if there aren't any changes
    if ($ModifiedFilesCount -eq 0 -and $AddedFilesCount -eq 0 -and $RemovedFilesCount -eq 0 -and $UntrackedFilesCount -eq 0)
    {
        Write-Host " $iconNoChanges " -NoNewline -ForegroundColor "green"
        return
    }

    if ($ModifiedFilesCount -gt 0)
    {
        Write-Host " $iconModified $ModifiedFilesCount " -NoNewline -ForegroundColor "blue"
    }
    if ($AddedFilesCount -gt 0)
    {
        Write-Host " $iconAdded $AddedFilesCount " -NoNewline -ForegroundColor "green"
    }
    if ($RemovedFilesCount -gt 0)
    {
        Write-Host " $iconRemoved $RemovedFilesCount " -NoNewline -ForegroundColor "red"
    }
    if ($UntrackedFilesCount -gt 0)
    {
        Write-Host " $iconUntracked $UntrackedFilesCount " -NoNewline -ForegroundColor "yellow"
    }
}

# Check if parent directory contains .git folder
function Check-ParentGit {
    $gitPaths = @(".git", "..\.git", "..\..\.git", "..\..\..\.git", "..\..\..\..\.git", "..\..\..\..\..\.git", "..\..\..\..\..\..\.git", "..\..\..\..\..\..\..\.git")

    foreach ($path in $gitPaths) {
        if (Test-Path $path) {
            return $true
        }
    }

    return $false
}

# Print some informations before prompt
Write-Date
Write-NodeVer
Write-NpmVer
Write-Host "`n" -NoNewline

# Custom prompt function
function prompt {
    $base = " " # icon folder
    $path = "$($executionContext.SessionState.Path.CurrentLocation)"
    $userPrompt = "$('>' * ($nestedPromptLevel + 1)) "

    Write-Host "`n$base" -NoNewline -ForegroundColor "green"

    $isGitRepo = Check-ParentGit
    
    if ($isGitRepo) {
        Write-Host $path -NoNewline -ForegroundColor "green"
        Write-GitInfo
    }
    else {
        # we're not in a repo so don't bother displaying branch name/sha
        Write-Host $path -ForegroundColor "green"
    }

    return $userPrompt
}