diff --git a/fastplotlib/_version.py b/fastplotlib/_version.py
index 172da7121..ddeeb3d84 100644
--- a/fastplotlib/_version.py
+++ b/fastplotlib/_version.py
@@ -1,5 +1,113 @@
+"""
+Versioning: we use a hard-coded version number, because it's simple and always
+works. For dev installs we add extra version info from Git.
+"""
+
+import logging
+import subprocess
+from pathlib import Path
+
+
+# This is the reference version number, to be bumped before each release.
+# The build system detects this definition when building a distribution.
__version__ = "0.5.0"
+# Allow using nearly the same code in different projects
+project_name = "fastplotlib"
+
+
+logger = logging.getLogger(project_name.lower())
+
+# Get whether this is a repo. If so, repo_dir is the path, otherwise repo_dir is None.
+repo_dir = Path(__file__).parents[1]
+repo_dir = repo_dir if repo_dir.joinpath(".git").is_dir() else None
+
+
+def get_version():
+ """Get the version string."""
+ if repo_dir:
+ return get_extended_version()
+ else:
+ return __version__
+
+
+def get_extended_version():
+ """Get an extended version string with information from git."""
+
+ release, post, labels = get_version_info_from_git()
+
+ # Sample first 3 parts of __version__
+ base_release = ".".join(__version__.split(".")[:3])
+
+ # Check release
+ if not release:
+ release = base_release
+ elif release != base_release:
+ logger.warning(
+ f"{project_name} version from git ({release}) and __version__ ({base_release}) don't match."
+ )
+
+ # Build the total version
+ version = release
+ if post and post != "0":
+ version += f".post{post}"
+ if labels:
+ version += "+" + ".".join(labels)
+
+ return version
+
+
+def get_version_info_from_git():
+ """Get (release, post, labels) from Git.
+
+ With `release` the version number from the latest tag, `post` the
+ number of commits since that tag, and `labels` a tuple with the
+ git-hash and optionally a dirty flag.
+ """
+
+ # Call out to Git
+ command = [
+ "git",
+ "describe",
+ "--long",
+ "--always",
+ "--tags",
+ "--dirty",
+ "--first-parent",
+ ]
+ try:
+ p = subprocess.run(command, cwd=repo_dir, capture_output=True)
+ except Exception as e:
+ logger.warning(f"Could not get {project_name} version: {e}")
+ p = None
+
+ # Parse the result into parts
+ if p is None:
+ parts = (None, None, "unknown")
+ else:
+ output = p.stdout.decode(errors="ignore")
+ if p.returncode:
+ stderr = p.stderr.decode(errors="ignore")
+ logger.warning(
+ f"Could not get {project_name} version.\n\nstdout: "
+ + output
+ + "\n\nstderr: "
+ + stderr
+ )
+ parts = (None, None, "unknown")
+ else:
+ parts = output.strip().lstrip("v").split("-")
+ if len(parts) <= 2:
+ # No tags (and thus also no post). Only git hash and maybe 'dirty'
+ parts = (None, None, *parts)
+
+ # Return unpacked parts
+ release, post, *labels = parts
+ return release, post, labels
+
+
+__version__ = get_version()
+
version_info = tuple(
int(i) if i.isnumeric() else i for i in __version__.split("+")[0].split(".")
)
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