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-rw-r--r--libbutl/git.cxx89
-rw-r--r--libbutl/git.mxx46
2 files changed, 135 insertions, 0 deletions
diff --git a/libbutl/git.cxx b/libbutl/git.cxx
new file mode 100644
index 0000000..bb5f542
--- /dev/null
+++ b/libbutl/git.cxx
@@ -0,0 +1,89 @@
+// file : libbutl/git.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef __cpp_modules
+#include <libbutl/git.mxx>
+#endif
+
+// C includes.
+
+#include <cassert>
+
+#ifndef __cpp_lib_modules
+#include <string>
+
+#include <cstddef> // size_t
+#endif
+
+// Other includes.
+
+#ifdef __cpp_modules
+module butl.git;
+
+// Only imports additional to interface.
+#ifdef __clang__
+#ifdef __cpp_lib_modules
+import std.core;
+#endif
+import butl.path;
+import butl.optional;
+import butl.standard_version
+#endif
+
+import butl.utility; // digit()
+import butl.filesystem; // entry_exists()
+#else
+#include <libbutl/utility.mxx>
+#include <libbutl/optional.mxx>
+#include <libbutl/filesystem.mxx>
+#include <libbutl/standard-version.mxx>
+#endif
+
+using namespace std;
+
+namespace butl
+{
+ bool
+ git_repository (const dir_path& d)
+ {
+ // .git can be either a directory or a file in case of a submodule or a
+ // separate working tree.
+ //
+ return entry_exists (d / ".git",
+ true /* follow_symlinks */,
+ true /* ignore_errors */);
+ }
+
+ optional<standard_version>
+ git_version (const string& s)
+ {
+ // There is some variety across platforms in the version
+ // representation.
+ //
+ // Linux: git version 2.14.3
+ // MacOS: git version 2.10.1 (Apple Git-78)
+ // MinGit: git version 2.16.1.windows.1
+ //
+ // We will consider the first 3 version components that follows the
+ // common 'git version ' prefix.
+ //
+ const size_t b (12);
+ if (s.compare (0, b, "git version ") == 0)
+ {
+ size_t i (b);
+ size_t n (0);
+ for (char c; i != s.size () && (digit (c = s[i]) || c == '.'); ++i)
+ {
+ if (c == '.' && ++n == 3)
+ break;
+ }
+
+ // Returns nullopt if fail to parse.
+ //
+ return parse_standard_version (string (s, b, i - b));
+ }
+
+ return nullopt;
+ }
+}
diff --git a/libbutl/git.mxx b/libbutl/git.mxx
new file mode 100644
index 0000000..b2023a6
--- /dev/null
+++ b/libbutl/git.mxx
@@ -0,0 +1,46 @@
+// file : libbutl/git.mxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef __cpp_modules
+#pragma once
+#endif
+
+// C includes.
+
+#ifndef __cpp_lib_modules
+#include <string>
+#endif
+
+// Other includes.
+
+#ifdef __cpp_modules
+export module butl.curl;
+#ifdef __cpp_lib_modules
+import std.core;
+#endif
+import butl.path;
+import butl.optional;
+import butl.standard_version
+#else
+#include <libbutl/path.mxx>
+#include <libbutl/optional.mxx>
+#include <libbutl/standard-version.mxx>
+#endif
+
+#include <libbutl/export.hxx>
+
+LIBBUTL_MODEXPORT namespace butl
+{
+ // Return true if the specified directory is a git repository root (contains
+ // the .git filesystem entry).
+ //
+ LIBBUTL_SYMEXPORT bool
+ git_repository (const dir_path&);
+
+ // Try to parse the line printed by the 'git --version' command. Return git
+ // version if succeed, nullopt otherwise.
+ //
+ LIBBUTL_SYMEXPORT optional<standard_version>
+ git_version (const std::string&);
+}