Backport Meson build support

Meson builds have better integration with Vala. For example, Meson
handles incremental compilation of Vala source files better than
CMake.

Limitations:

As done with CMake builds, gresource.xml should be compiled. Now, it has
been generated from a CMake build and manually copied into the source
tree.

1 files changed, 36 insertions, 0 deletions

diff --git a/libdino/version.py b/libdino/version.py
new file mode 100644
index 00000000..d34db6a8
--- /dev/null
+++ b/libdino/version.py
@@ -0,0 +1,36 @@
+import argparse
+import subprocess
+VERSION_VALA = """\
+namespace Dino {{
+
+public const string VERSION = "{}";
+
+}}
+"""
+
+def compute_version(file, git_repo, git):
+    try:
+        with open(file) as f:
+            return f.read().strip()
+    except FileNotFoundError:
+        pass
+    return subprocess.check_output([git, "describe", "--tags"], cwd=git_repo, text=True).strip()
+
+def generate_version_vala(version):
+    if "\\" in version or "\"" in version:
+        raise ValueError(f"invalid version {version!r}")
+    return VERSION_VALA.format(version)
+
+def main():
+    p = argparse.ArgumentParser(description="Compute the Dino version")
+    p.add_argument("--git-repo", help="Path to checked out git repository")
+    p.add_argument("--git", help="Path to git executable", default="git")
+    p.add_argument("version_file", metavar="VERSION_FILE", help="Use this file's contents as version if the file exists")
+    p.add_argument("output", metavar="OUTPUT", help="Vala file to output to")
+    args = p.parse_args()
+    out = generate_version_vala(compute_version(args.version_file, args.git_repo, args.git))
+    with open(args.output, "w") as f:
+        f.write(out)
+
+if __name__ == "__main__":
+    main()