1 files changed, 80 insertions, 0 deletions
diff --git a/src/common/scm_rev_gen.js b/src/common/scm_rev_gen.js
new file mode 100644
index 000000000..e3ca5e67b
--- /dev/null
+++ b/src/common/scm_rev_gen.js
@@ -0,0 +1,80 @@
+var wshShell		= new ActiveXObject("WScript.Shell")
+var oFS				= new ActiveXObject("Scripting.FileSystemObject");
+
+var outfile			= "./src/scm_rev.h";
+var cmd_revision	= " rev-parse HEAD";
+var cmd_describe	= " describe --always --long --dirty";
+var cmd_branch		= " rev-parse --abbrev-ref HEAD";
+
+function GetGitExe()
+{
+	for (var gitexe in {"git.cmd":1, "git":1})
+	{
+		try
+		{
+			wshShell.Exec(gitexe);
+			return gitexe;
+		}
+		catch (e)
+		{}
+	}
+
+	WScript.Echo("Cannot find git or git.cmd, check your PATH:\n" +
+		wshShell.ExpandEnvironmentStrings("%PATH%"));
+	WScript.Quit(1);
+}
+
+function GetFirstStdOutLine(cmd)
+{
+	try
+	{
+		return wshShell.Exec(cmd).StdOut.ReadLine();
+	}
+	catch (e)
+	{
+		// catch "the system cannot find the file specified" error
+		WScript.Echo("Failed to exec " + cmd + " this should never happen");
+		WScript.Quit(1);
+	}
+}
+
+function GetFileContents(f)
+{
+	try
+	{
+		return oFS.OpenTextFile(f).ReadAll();
+	}
+	catch (e)
+	{
+		// file doesn't exist
+		return "";
+	}
+}
+
+// get info from git
+var gitexe = GetGitExe();
+var revision	= GetFirstStdOutLine(gitexe + cmd_revision);
+var describe	= GetFirstStdOutLine(gitexe + cmd_describe);
+var branch		= GetFirstStdOutLine(gitexe + cmd_branch);
+var isMaster    = +("master" == branch);
+
+// remove hash (and trailing "-0" if needed) from description
+describe = describe.replace(/(-0)?-[^-]+(-dirty)?$/, '$2');
+
+var out_contents =
+	"#define SCM_REV_STR \"" + revision + "\"\n" +
+	"#define SCM_DESC_STR \"" + describe + "\"\n" +
+	"#define SCM_BRANCH_STR \"" + branch + "\"\n" +
+	"#define SCM_IS_MASTER " + isMaster + "\n";
+
+// check if file needs updating
+if (out_contents == GetFileContents(outfile))
+{
+	WScript.Echo(outfile + " current at " + describe);
+}
+else
+{
+	// needs updating - writeout current info
+	oFS.CreateTextFile(outfile, true).Write(out_contents);
+	WScript.Echo(outfile + " updated to " + describe);
+}