build: remove version.py

After second thought version.py does not do anything useful. Meson has
built-in function vcs_tag that mostly replicate what version.py did. For
the build time we can just use __DATE__ and __TIME__. Of course this
changes time string format a little, but in my opinion it looks nicer in
fact.

Also it will use local time, instead UTC. But I would argue that date
string is only informative for users to check how old the specific mpv
build is. It doesn't have to be precise, it weren't for years anyway
before recent change.

common/meson.build

@@ -0,0 +1,8 @@
+version_h = vcs_tag(
+    command: ['git', 'describe', '--always', '--tags', '--dirty'],
+    input: 'version.h.in',
+    output: 'version.h',
+    replace_string: '@VERSION@',
+)
+
+sources += version_h

common/version.h.in

@@ -0,0 +1,3 @@
+#define VERSION "@VERSION@"
+#define BUILDDATE __DATE__ " " __TIME__
+#define MPVCOPYRIGHT "Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects"

meson.build

@@ -556,7 +556,6 @@ tools_directory = join_paths(source_root, 'TOOLS')
 docutils_wrapper = find_program(join_paths(tools_directory, 'docutils-wrapper.py'))
 file2string = find_program(join_paths(tools_directory, 'file2string.py'))
 matroska = find_program(join_paths(tools_directory, 'matroska.py'))
-version_py = find_program(join_paths(source_root, 'version.py'))
 
 ebml_defs = custom_target('ebml_defs.inc',
     output: 'ebml_defs.inc',
@@ -568,13 +567,9 @@ ebml_types = custom_target('ebml_types.h',
     command: [matroska, '--generate-header', '@OUTPUT@'],
 )
 
-version_h = custom_target('version.h',
+sources += [ebml_defs, ebml_types]
-    output: 'version.h',
-    command: [version_py, '@OUTPUT@'],
-    build_always_stale: true,
-)
-sources += [ebml_defs, ebml_types, version_h]
 
+subdir('common')
 subdir('etc')
 subdir('player')
 subdir('sub')

version.py

@@ -1,42 +0,0 @@
-#!/usr/bin/env python3
-
-import os
-import sys
-import time
-
-from datetime import datetime,timezone
-from shutil import which
-from subprocess import check_output
-
-srcdir = os.path.dirname(os.path.abspath(sys.argv[0]))
-git_dir = os.path.join(srcdir, ".git")
-git = which('git')
-
-if git and os.path.exists(git_dir):
-    version = check_output([git, "-C", srcdir, "describe", "--always", "--tags",
-                            "--dirty"], encoding="UTF-8")
-    version = version[1:].strip()
-else:
-    version_path = os.path.join(srcdir, "VERSION")
-    with open(version_path, "r") as f:
-        version = f.readline().strip()
-
-if len(sys.argv) < 2:
-    print(version)
-    sys.exit()
-
-ts = float(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
-date = datetime.fromtimestamp(ts, timezone.utc)
-
-OLD_REVISION = ""
-NEW_REVISION = f'#define VERSION "{version}"'
-BUILDDATE = f'#define BUILDDATE "{date.ctime()}"'
-MPVCOPYRIGHT = f'#define MPVCOPYRIGHT "Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects"'
-
-if os.path.isfile(sys.argv[1]):
-    with open(sys.argv[1], "r") as f:
-        OLD_REVISION = f.readline().strip()
-
-if NEW_REVISION != OLD_REVISION or NEW_REVISION.endswith('dirty"'):
-    with open(sys.argv[1], "w", encoding="utf-8") as f:
-        f.writelines(f"{l}{os.linesep}" for l in [NEW_REVISION, BUILDDATE, MPVCOPYRIGHT])