Add fancy versioning stuff

sticker/get_version.py

@@ -0,0 +1,50 @@
+import subprocess
+import shutil
+import os
+
+from . import __version__
+
+cmd_env = {
+    "PATH": os.environ["PATH"],
+    "HOME": os.environ["HOME"],
+    "LANG": "C",
+    "LC_ALL": "C",
+}
+
+
+def run(cmd):
+    return subprocess.check_output(cmd, stderr=subprocess.DEVNULL, env=cmd_env)
+
+
+if (os.path.exists("../.git") or os.path.exists(".git")) and shutil.which("git"):
+    try:
+        git_revision = run(["git", "rev-parse", "HEAD"]).strip().decode("ascii")
+        git_revision_url = f"https://github.com/maunium/stickerpicker/commit/{git_revision}"
+        git_revision = git_revision[:8]
+    except (subprocess.SubprocessError, OSError):
+        git_revision = "unknown"
+        git_revision_url = None
+
+    try:
+        git_tag = run(["git", "describe", "--exact-match", "--tags"]).strip().decode("ascii")
+    except (subprocess.SubprocessError, OSError):
+        git_tag = None
+else:
+    git_revision = "unknown"
+    git_revision_url = None
+    git_tag = None
+
+git_tag_url = (f"https://github.com/maunium/stickerpicker/releases/tag/{git_tag}"
+               if git_tag else None)
+
+if git_tag and __version__ == git_tag[1:].replace("-", ""):
+    version = __version__
+    linkified_version = f"[{version}]({git_tag_url})"
+else:
+    if not __version__.endswith("+dev"):
+        __version__ += "+dev"
+    version = f"{__version__}.{git_revision}"
+    if git_revision_url:
+        linkified_version = f"{__version__}.[{git_revision}]({git_revision_url})"
+    else:
+        linkified_version = version