Add git version check (2.12 is minimum supported)

1 files changed, 50 insertions, 0 deletions

diff --git a/bdep/git.txx b/bdep/git.txx
new file mode 100644
index 0000000..aef5f3d
--- /dev/null
+++ b/bdep/git.txx
@@ -0,0 +1,50 @@
+// file      : bdep/git.txx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+namespace bdep
+{
+  template <typename... A>
+  void
+  run_git (const dir_path& repo, A&&... args)
+  {
+    process pr (start_git (repo,
+                           0 /* stdin  */,
+                           1 /* stdout */,
+                           2 /* stderr */,
+                           forward<A> (args)...));
+
+    finish_git (pr);
+  }
+
+  void
+  git_check_version ();
+
+  template <typename I, typename O, typename E, typename... A>
+  process
+  start_git (I&& in, O&& out, E&& err, A&&... args)
+  {
+    git_check_version ();
+
+    return start (forward<I> (in),
+                  forward<O> (out),
+                  forward<E> (err),
+                  "git",
+                  forward<A> (args)...);
+  }
+
+  template <typename... A>
+  optional<string>
+  git_line (bool ie, A&&... args)
+  {
+    fdpipe pipe (fdopen_pipe ());
+    auto_fd null (ie ? fdnull () : auto_fd ());
+
+    process pr (start_git (0                    /* stdin  */,
+                           pipe                 /* stdout */,
+                           ie ? null.get () : 2 /* stderr */,
+                           forward<A> (args)...));
+
+    return git_line (move (pr), move (pipe), ie);
+  }
+}