UpdateVersion.cs

// Run this from the working directory where the solution or project to build is located.

using System.Text.RegularExpressions;

var dirPath = "/home/buildagent";
var filePath = dirPath + "/version";
var startingVer = new Version(1,4,1, 0);
var updateVersion = Args[0];


// Get current version
WriteLine($"Preparing version file at {filePath}");
Directory.CreateDirectory(dirPath);
File.Open(filePath, FileMode.OpenOrCreate).Dispose();
var text = File.ReadAllText(filePath);
WriteLine($"Version string: {text}");

if (String.IsNullOrEmpty(text))
{
    WriteLine($"Version string is empty. Restoring default: {startingVer}");
    text = startingVer.ToString();
    File.WriteAllText(filePath, text);
}

var version = new Version(text);
int major = version.Major;
int minor = version.Minor;
int build = version.Build;
int snapshot = version.Revision == -1 ? 0 : version.Revision;
bool prereleaseBuild = false;

// Increment version if needed 
switch (updateVersion)
{
    case "major":
        WriteLine($"Updating Major version {major} -> {++major}");
        minor = 0;
        build = 0;
        snapshot = 0;
        break;
    case "minor":
        WriteLine($"Updating Minor version {minor} -> {++minor}");
        build = 0;
        snapshot = 0;
        break;
    case "build":
        if (snapshot == 0)
            WriteLine($"Updating Build version {build} -> {++build}");
        snapshot = 0;
        break;
    case "dev":
        if (snapshot == 0)
            WriteLine($"Updating Build version {build} -> {++build}");
        WriteLine($"Updating snapshot version {snapshot} -> {++snapshot}");
        prereleaseBuild = true;
        break;
}


// Update version 
var updatedVersion = new Version(major, minor, build, snapshot);
WriteLine($"Writing new version to file: {updatedVersion}");
File.WriteAllText(filePath, updatedVersion.ToString());
Props["version"] = updatedVersion.ToString(3);


// Find and backup .csproj files
var projects = Utils.ScanProjects("./", new List<string>());
Utils.CleanupBackupsFor(projects);
Utils.BackupProjects(projects);