diff --git a/.gitignore b/.gitignore
index 20e5484..9e98776 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,8 +6,10 @@
 *.a
 *.so
 *.dylib
-ver
-ver-gui
+/ver
+/ver.exe
+/ver-gui
+/ver-gui.exe
 bin/
 build/
 *.lst
diff --git a/source/ver/detect.d b/source/ver/detect.d
new file mode 100644
index 0000000..c02b87a
--- /dev/null
+++ b/source/ver/detect.d
@@ -0,0 +1,58 @@
+module ver.detect;
+
+import std.file : exists, isDir;
+import std.path : buildPath;
+import ver.types;
+
+/** Walk upward from `startDir` looking for a VCS root. */
+string findVcsRoot(string startDir)
+{
+	import std.path : absolutePath, dirName;
+
+	auto dir = absolutePath(startDir);
+	while (true)
+	{
+		if (exists(buildPath(dir, ".git")))
+			return dir;
+		if (exists(buildPath(dir, ".svn")) && isDir(buildPath(dir, ".svn")))
+			return dir;
+		if (exists(buildPath(dir, ".hg")) && isDir(buildPath(dir, ".hg")))
+			return dir;
+		auto parent = dirName(dir);
+		if (parent == dir)
+			return null;
+		dir = parent;
+	}
+}
+
+/** Detect VCS kind for `dir` (or its nearest ancestor root). */
+VcsKind detectVcs(string dir = ".")
+{
+	auto root = findVcsRoot(dir);
+	if (root is null)
+		return VcsKind.none;
+	if (exists(buildPath(root, ".git")))
+		return VcsKind.git;
+	if (exists(buildPath(root, ".svn")))
+		return VcsKind.svn;
+	if (exists(buildPath(root, ".hg")))
+		return VcsKind.hg;
+	return VcsKind.unknown;
+}
+
+string vcsKindName(VcsKind kind)
+{
+	final switch (kind)
+	{
+	case VcsKind.none:
+		return "none";
+	case VcsKind.git:
+		return "git";
+	case VcsKind.svn:
+		return "svn";
+	case VcsKind.hg:
+		return "hg";
+	case VcsKind.unknown:
+		return "unknown";
+	}
+}
diff --git a/source/ver/dispatch.d b/source/ver/dispatch.d
new file mode 100644
index 0000000..e522a20
--- /dev/null
+++ b/source/ver/dispatch.d
@@ -0,0 +1,43 @@
+module ver.dispatch;
+
+import ver.detect;
+import ver.handlers;
+import ver.types;
+
+/** Dispatch a Ver command using the detected VCS under `workDir`. */
+CommandResult dispatch(string command, string[] args, string workDir = ".")
+{
+	if (command == "help" || command == "--help")
+		return CommandResult(0, helpText(), "", "ver");
+
+	if (command == "version" || command == "--version")
+	{
+		import ver : verVersion;
+		return CommandResult(0, "Ver " ~ verVersion ~ "\n", "", "ver");
+	}
+
+	if (command == "init")
+	{
+		auto kind = detectVcs(workDir);
+		if (kind == VcsKind.none || kind == VcsKind.git)
+			return gitHandle("init", args, workDir);
+		if (kind == VcsKind.hg)
+			return hgHandle("init", args, workDir);
+		return CommandResult(2, "", "cannot init: existing non-git/hg VCS", "ver");
+	}
+
+	auto kind = detectVcs(workDir);
+	final switch (kind)
+	{
+	case VcsKind.git:
+		return gitHandle(command, args, workDir);
+	case VcsKind.svn:
+		return svnHandle(command, args, workDir);
+	case VcsKind.hg:
+		return hgHandle(command, args, workDir);
+	case VcsKind.none:
+		return CommandResult(1, "", "No version control system detected. Use 'ver init'.", "ver");
+	case VcsKind.unknown:
+		return CommandResult(1, "", "Unknown VCS detected.", "ver");
+	}
+}
diff --git a/source/ver/handlers.d b/source/ver/handlers.d
new file mode 100644
index 0000000..fe1bbb3
--- /dev/null
+++ b/source/ver/handlers.d
@@ -0,0 +1,127 @@
+module ver.handlers;
+
+import std.array : join;
+import std.process : Config, execute;
+import std.string : strip;
+import ver.types;
+
+private CommandResult runTool(string name, string[] args, string workDir)
+{
+	auto result = execute([name] ~ args, null, Config.none, size_t.max, workDir);
+	return CommandResult(result.status, result.output, "", name);
+}
+
+/** Git-backed handler for the Ver command vocabulary. */
+CommandResult gitHandle(string command, string[] args, string workDir)
+{
+	switch (command)
+	{
+	case "status":
+		return runTool("git", ["status", "--short", "--branch"], workDir);
+	case "history":
+		return runTool("git", ["log", "--oneline", "-n", "20"], workDir);
+	case "save":
+		if (args.length == 0)
+			return CommandResult(2, "", "save requires a message", "git");
+		auto msg = args.join(" ");
+		auto add = runTool("git", ["add", "-A"], workDir);
+		if (add.exitCode != 0)
+			return add;
+		return runTool("git", ["commit", "-m", msg], workDir);
+	case "stage":
+		if (args.length == 0)
+			return runTool("git", ["add", "-A"], workDir);
+		return runTool("git", ["add"] ~ args, workDir);
+	case "sync":
+		auto pull = runTool("git", ["pull", "--rebase", "--autostash"], workDir);
+		if (pull.exitCode != 0)
+			return pull;
+		return runTool("git", ["push"], workDir);
+	case "branch":
+		if (args.length == 0)
+			return runTool("git", ["branch", "-vv"], workDir);
+		if (args[0] == "switch" && args.length > 1)
+			return runTool("git", ["switch", args[1]], workDir);
+		return runTool("git", ["branch"] ~ args, workDir);
+	case "init":
+		return runTool("git", ["init"], workDir);
+	case "merge":
+		if (args.length == 0)
+			return CommandResult(2, "", "merge requires a branch name", "git");
+		return runTool("git", ["merge"] ~ args, workDir);
+	default:
+		return CommandResult(2, "", "unsupported command for git: " ~ command, "git");
+	}
+}
+
+CommandResult svnHandle(string command, string[] args, string workDir)
+{
+	switch (command)
+	{
+	case "status":
+		return runTool("svn", ["status"], workDir);
+	case "history":
+		return runTool("svn", ["log", "-l", "20"], workDir);
+	case "save":
+		if (args.length == 0)
+			return CommandResult(2, "", "save requires a message", "svn");
+		return runTool("svn", ["commit", "-m", args.join(" ")], workDir);
+	case "stage":
+		return CommandResult(0, "svn has no separate stage step", "", "svn");
+	case "sync":
+		return runTool("svn", ["update"], workDir);
+	case "init":
+		return CommandResult(2, "", "use svnadmin create / svn checkout for svn repos", "svn");
+	default:
+		return CommandResult(2, "", "unsupported command for svn: " ~ command, "svn");
+	}
+}
+
+CommandResult hgHandle(string command, string[] args, string workDir)
+{
+	switch (command)
+	{
+	case "status":
+		return runTool("hg", ["status"], workDir);
+	case "history":
+		return runTool("hg", ["log", "-l", "20"], workDir);
+	case "save":
+		if (args.length == 0)
+			return CommandResult(2, "", "save requires a message", "hg");
+		return runTool("hg", ["commit", "-m", args.join(" ")], workDir);
+	case "stage":
+		return CommandResult(0, "hg stages at commit time", "", "hg");
+	case "sync":
+		auto pull = runTool("hg", ["pull", "-u"], workDir);
+		if (pull.exitCode != 0)
+			return pull;
+		return runTool("hg", ["push"], workDir);
+	case "init":
+		return runTool("hg", ["init"], workDir);
+	default:
+		return CommandResult(2, "", "unsupported command for hg: " ~ command, "hg");
+	}
+}
+
+string helpText()
+{
+	return q"EOS
+Ver - Universal Version Control Interface
+
+Usage: ver <command> [options]
+
+Commands:
+  init              Initialize a repository (git/hg)
+  save <msg>        Commit / save changes with a message
+  stage [paths...]  Stage files (git) or no-op elsewhere
+  status            Show working-tree status
+  history           Show recent history
+  sync              Pull then push (or svn update)
+  branch [...]      List or manage branches
+  merge <branch>    Merge a branch (git)
+  help              Show this help
+  version           Show version
+
+Provider-specific tooling is selected from the nearest VCS root.
+EOS".strip;
+}
diff --git a/source/ver/package.d b/source/ver/package.d
new file mode 100644
index 0000000..565d345
--- /dev/null
+++ b/source/ver/package.d
@@ -0,0 +1,9 @@
+/** Ver — universal version-control interface (library API). */
+module ver;
+
+public import ver.detect;
+public import ver.dispatch;
+public import ver.handlers;
+public import ver.types;
+
+enum string verVersion = "0.2.0";
diff --git a/source/ver/types.d b/source/ver/types.d
new file mode 100644
index 0000000..1b0d0b7
--- /dev/null
+++ b/source/ver/types.d
@@ -0,0 +1,20 @@
+module ver.types;
+
+/** Identifies which VCS backend is active for a working tree. */
+enum VcsKind
+{
+	none,
+	git,
+	svn,
+	hg,
+	unknown,
+}
+
+/** Result of running a mapped Ver command. */
+struct CommandResult
+{
+	int exitCode;
+	string stdout;
+	string stderr;
+	string handlerName;
+}
diff --git a/ver.pdb b/ver.pdb
new file mode 100644
index 0000000..08320b2
Binary files /dev/null and b/ver.pdb differ