added basic version of VCS supprt for configuring files based on VCS state during build time

1 files changed, 60 insertions, 0 deletions

diff --git a/meson_vcs_info.py b/meson_vcs_info.py
new file mode 100755
index 0000000..9f5e462
--- /dev/null
+++ b/meson_vcs_info.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+# Copyright 2013-2015 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys, os, shutil, shlex, subprocess
+import backends
+
+def update_vcs_info(vcs_cmd, vcs_dir, vcs_info_file):
+    """Update the string in the vcs_info_file with the stdout of vcs_cmd executed in vcs_dir."""
+
+    cmd = shlex.split(vcs_cmd)
+    # Is the command an executable in path or maybe a script in the source tree?
+    cmd[0] = shutil.which(cmd[0]) or os.path.join(vcs_dir, cmd[0])
+
+    try:
+        info = subprocess.check_output(cmd, cwd=vcs_dir)
+    except FileNotFoundError:
+        print('Could not execute command "%s".' % ' '.join(cmd))
+        sys.exit(1)
+    except subprocess.CalledProcessError as e:
+        print('Failed to get repository information from %s.\n' % vcs_dir)
+        sys.exit(e.returncode)
+
+    info = info.strip()
+
+    if (not os.path.exists(vcs_info_file)) or (open(vcs_info_file, 'rb').read() != info):
+        open(vcs_info_file, 'wb').write(info)
+
+
+def configure_vcs_info(vcs_info_file, config_var_name, input_file, output_file):
+    """Configure the input_file by replacing the variable config_var_name with the contents of the vcs_info_file and save it as output_file."""
+
+    info = open(vcs_info_file).read()
+    backends.do_conf_file(input_file, output_file, {config_var_name : info})
+
+
+if __name__ == '__main__':
+    if not len(sys.argv) in [5,6]:
+        print('Version Control Systems helper script for Meson. Do not run on your own, mmm\'kay?')
+        print('%s update <vcs_cmd> <vcs_dir> <vcs_info_file>' % sys.argv[0])
+        print('%s configure <vcs_info_file> <config_var_name> <input_file> <output_file>' % sys.argv[0])
+        sys.exit(1)
+
+    if sys.argv[1] == 'update':
+        update_vcs_info( *sys.argv[2:5] )
+    elif sys.argv[1] == 'configure':
+        configure_vcs_info( *sys.argv[2:6] )
+