Move version build system module to separate library

1 files changed, 39 insertions, 0 deletions

diff --git a/libbuild2/version/snapshot.cxx b/libbuild2/version/snapshot.cxx
new file mode 100644
index 0000000..46b37f3
--- /dev/null
+++ b/libbuild2/version/snapshot.cxx
@@ -0,0 +1,39 @@
+// file      : libbuild2/version/snapshot.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/version/snapshot.hxx>
+
+#include <libbuild2/filesystem.hxx>
+
+using namespace std;
+
+namespace build2
+{
+  namespace version
+  {
+    snapshot
+    extract_snapshot_git (const dir_path&);
+
+    static const path git (".git");
+
+    snapshot
+    extract_snapshot (const scope& rs)
+    {
+      // Ignore errors when checking for existence since we may be iterating
+      // over directories past any reasonable project boundaries.
+      //
+      for (dir_path d (rs.src_path ()); !d.empty (); d = d.directory ())
+      {
+        // .git can be either a directory or a file in case of a submodule.
+        //
+        if (butl::entry_exists (d / git,
+                                true /* follow_symlinks */,
+                                true /* ignore_errors */))
+          return extract_snapshot_git (d);
+      }
+
+      return snapshot ();
+    }
+  }
+}