Adding build version information to main window/log.

xenia-build

@@ -178,6 +178,57 @@ def shell_call(command, throw_on_error=True, stdout_path=None):
   return result
 
 
+def get_git_head_info():
+  """Queries the current branch and commit checksum from git.
+
+  Returns:
+    (branch_name, commit, commit_short)
+    If the user is not on any branch the name will be 'detached'.
+  """
+  p = subprocess.Popen([
+      'git',
+      'symbolic-ref',
+      '--short',
+      '-q',
+      'HEAD',
+      ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  (stdout, stderr) = p.communicate()
+  branch_name = stdout.strip() or 'detached'
+  p = subprocess.Popen([
+      'git',
+      'rev-parse',
+      'HEAD',
+      ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  (stdout, stderr) = p.communicate()
+  commit = stdout.strip() or 'unknown'
+  p = subprocess.Popen([
+      'git',
+      'rev-parse',
+      '--short',
+      'HEAD',
+      ], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  (stdout, stderr) = p.communicate()
+  commit_short = stdout.strip() or 'unknown'
+  return (branch_name, commit, commit_short)
+
+
+def generate_version_h():
+  """Generates a build/version.h file that contains current git info.
+  """
+  (branch_name, commit, commit_short) = get_git_head_info()
+  contents = '''// Autogenerated by `xb premake`.
+#ifndef GENERATED_VERSION_H_
+#define GENERATED_VERSION_H_
+#define XE_BUILD_BRANCH "%s"
+#define XE_BUILD_COMMIT "%s"
+#define XE_BUILD_COMMIT_SHORT "%s"
+#define XE_BUILD_DATE __DATE__
+#endif  // GENERATED_VERSION_H_
+''' % (branch_name, commit, commit_short)
+  with open('build/version.h', 'w') as f:
+    f.write(contents)
+
+
 def git_submodule_update():
   """Runs a full recursive git submodule init and update.
 
@@ -253,6 +304,7 @@ def run_premake(target_os, action):
       '--verbose',
       action,
       ])
+  generate_version_h()
 
 
 def run_premake_clean():