Powershell script that will bump version numbers in C# AssemblyInfo files, commit them, and tag the commit.

bump-version-from-git.ps1

[CmdletBinding()]
Param(
    [Parameter(Mandatory=$True,Position=1)]
    [string]$bumpKind
)

function getVersion() {
    $tag = Invoke-Expression "git describe --tags --always 2>&1"

    $tag = $tag.Split('-')[0]
    $tag = $tag -replace 'v', ''

    if ($tag -notmatch "\d+\.\d+\.\d+\.\d+") {
        $tag = '1.0.0.0'
    }

    Write-Verbose "Version found: $tag"
    return $tag
}

function bumpVersion($kind, $version) {
    $major, $minor, $patch, $build = $version.split('.')

    switch ($kind) {
        "major" {
            $major = [int]$major + 1
        }
        "minor" {
            $minor = [int]$minor + 1
        }
        "patch" {
            $patch = [int]$patch + 1
        }
        "build" {
            $build = [int]$build + 1
        }
    }

    return [string]::Format("{0}.{1}.{2}.{3}", $major, $minor, $patch, $build)
}

function commitVersion($kind, $version) {
    Invoke-Expression "git add **/*/AssemblyInfo.cs 2>&1 | Write-Verbose"
    Invoke-Expression "git commit -m 'Bumped $kind number. Version now $version' 2>&1 | Write-Verbose"
    Invoke-Expression "git tag v$version 2>&1 | Write-Verbose"
}

# Some functionality from https://gist.github.com/jokecamp/a2a314d62490fca1517a9a031c5606e9
function SetVersion ($file, $version) {
    Write-Verbose "Changing version in $file to $version"
    $fileObject = get-item $file

    $sr = new-object System.IO.StreamReader( $file, [System.Text.Encoding]::GetEncoding("utf-8") )
    $content = $sr.ReadToEnd()
    $sr.Close()

    $content = [Regex]::Replace($content, "(\d+)\.(\d+)\.(\d+)[\.(\d+)]*", $version);

    $sw = new-object System.IO.StreamWriter( $file, $false, [System.Text.Encoding]::GetEncoding("utf-8") )
    $sw.Write( $content )
    $sw.Close()
}

function setVersionInDir($dir, $version) {
    if ($version -eq "") {
        Write-Verbose "version not found"
        exit 1
    }

    # Set the Assembly version
    $info_files = Get-ChildItem $dir -Recurse -Include "AssemblyInfo.cs"

    foreach($file in $info_files)
    {
        Setversion $file $version
    }
}


$validCommands = @("major", "minor", "patch", "build")

if ($bumpKind -eq '')
{
    Write-Output "Missing which number to bump up!"
    exit 1
}

if (-not $validCommands.Contains($bumpKind))
{
    Write-Output "Invalid command!"
    exit 1
}


$oldVersion = getVersion
$newVersion = bumpVersion $bumpKind $oldVersion

$dir = "./"

setVersionInDir $dir $newVersion
commitVersion $bumpKind $newVersion

# Dump the updated version number to Stdout so we can pick it up in CI when needed!
Write-Output $newVersion