added scm_rev_gen project to automatically create a header with the git revision on build

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);
+}