Add Multidoc utiity for creating versioned documentation

.gitignore

@@ -145,3 +145,4 @@ examples/data
 /imod/tests/mydask.png
 /imod/tests/*_report.xml
 docs/sg_execution_times.rst
+docs/workdir/

docs/conf.py

@@ -8,7 +8,8 @@
 
 # -- Path setup --------------------------------------------------------------
 
-
+import os
+import subprocess
 from importlib.metadata import distribution
 
 # If extensions (or modules to document with autodoc) are in another directory,
@@ -126,6 +127,20 @@
 # further.  For a list of options available for each theme, see the
 # documentation.
 #
+version_or_name = subprocess.run(
+    "git symbolic-ref -q --short HEAD || git describe --tags --exact-match",
+    capture_output=True,
+    shell=True,
+    text=True,
+).stdout.strip()
+
+env = os.environ
+json_url = (
+    "https://deltares.github.io/imod-python/_static/switcher.json"
+    if "JSON_URL" not in env
+    else env["JSON_URL"]
+)
+
 html_theme_options = {
     "navbar_align": "content",
     "icon_links": [
@@ -146,6 +161,13 @@
         "image_light": "imod-python-logo-light.svg",
         "image_dark": "imod-python-logo-dark.svg",
     },
+    "switcher": {
+        "json_url": json_url,
+        "version_match": version_or_name,
+    },
+    "navbar_end": ["theme-switcher", "navbar-icon-links", "version-switcher"],
+    "show_version_warning_banner": True,
+    "check_switcher": False,
 }
 
 # Custom sidebar templates, must be a dictionary that maps document names

docs/multidoc.py

@@ -0,0 +1,316 @@
+import argparse
+import os
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+import git
+import jinja2
+import packaging.version
+
+
+class MultiDoc:
+    def __init__(self):
+        # Define useful paths
+        self.current_dir = Path(os.path.dirname(os.path.abspath(__file__)))
+
+        self.root_dir = self.current_dir.parent
+        self.patch_file = self.current_dir / "version-switcher-patch.diff"
+
+        # Attach to existing repo
+        self.repo = git.Repo.init(self.root_dir)
+
+        # Parse arguments
+        root_parser = self.setup_arguments()
+        args = root_parser.parse_args()
+        self.config = vars(args)
+
+        # Set additional paths
+        self.work_dir = (
+            Path(self.config["build_folder"])
+            if os.path.isabs(self.config["build_folder"])
+            else self.current_dir / self.config["build_folder"]
+        )
+        self.doc_dir = (
+            Path(self.config["doc_folder"])
+            if os.path.isabs(self.config["doc_folder"])
+            else self.current_dir / self.config["doc_folder"]
+        )
+
+        # Setup url
+        self.baseurl = (
+            "https://deltares.github.io/imod-python"
+            if not self.config["local_build"]
+            else self.doc_dir.as_uri()
+        )
+        self.json_location = "_static/switcher.json"
+
+        # Execute command
+        if self.config["command"] is None:
+            root_parser.print_help()
+            sys.exit(0)
+
+        getattr(self, self.config["command"].replace("-", "_"))()
+
+    def setup_arguments(self):
+        root_parser = argparse.ArgumentParser(
+            description="A simple multi version sphinx doc builder.",
+            formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+            exit_on_error=True,
+        )
+
+        # Common arguments shared by all commands
+        root_parser.add_argument(
+            "--doc-folder",
+            action="store",
+            default=self.current_dir / "_build" / "html",
+            help="Folder that contains the existing documentation and where new documentation will be added",
+        )
+        root_parser.add_argument(
+            "--build-folder",
+            action="store",
+            default=self.current_dir / "workdir",
+            help="Folder in which the version is checked out and build.",
+        )
+        root_parser.add_argument(
+            "--local-build",
+            action="store_true",
+            help="Changes the hardcoded url of the switcher.json to a local file url. This makes it possible to use the version switcher locally.",
+        )
+        subparsers = root_parser.add_subparsers(dest="command")
+
+        # Parser for "add-version"
+        add_version_parser = subparsers.add_parser(
+            "add-version",
+            help="Build and add a version to the documentation.",
+            exit_on_error=True,
+        )
+        add_version_parser.add_argument("version", help="Version to add.")
+
+        # Parser for "update-version"
+        update_version_parser = subparsers.add_parser(
+            "update-version",
+            help="Build and override a version of the documentation.",
+            exit_on_error=True,
+        )
+        update_version_parser.add_argument("version", help="Version to update.")
+
+        # Parser for "remove-version"
+        remove_version_parser = subparsers.add_parser(
+            "remove-version",
+            help="Remove a version from the documentation.",
+            exit_on_error=True,
+        )
+        remove_version_parser.add_argument("version", help="Version to remove.")
+
+        # Parser for "list-versions"
+        _ = subparsers.add_parser(
+            "list-versions", help="List present versions in the documentation"
+        )
+        _ = subparsers.add_parser(
+            "create-switcher", help="List present versions in the documentation"
+        )
+
+        return root_parser
+
+    def add_version(self):
+        version = self.config["version"]
+        print(f"add-version: {version}")
+
+        self._build_version(version)
+        self._build_switcher()
+
+    def update_version(self):
+        version = self.config["version"]
+        print(f"update-version: {version}")
+
+        self._build_version(version)
+
+    def remove_version(self):
+        version = self.config["version"]
+        print(f"remove-version: {version}")
+
+        shutil.rmtree(self.doc_dir / version)
+        self._build_switcher()
+
+    def _build_version(self, version):
+        with GitWorktreeManager(self.repo, self.work_dir, version):
+            # Define the branch documentation source folder and build folder
+            local_source_dir = self.work_dir / "docs"
+            local_build_dir = self.work_dir / "builddir"
+
+            # Apply patch to older version. Once it is known in which version(branch/tag) this file will be added
+            # we can add a check to apply this patch only to older versions
+            print("Applying patch")
+            _ = subprocess.run(
+                ["git", "apply", self.patch_file],
+                cwd=self.work_dir,
+                check=True,
+            )
+
+            # Clean existing Pixi enviroment settings
+            print(
+                "Clearing pixi enviroment settings. This is needed for a clean build."
+            )
+            env = os.environ
+            path_items = os.environ["PATH"].split(os.pathsep)
+            filtered_path = [
+                path
+                for path in path_items
+                if not os.path.abspath(path).startswith(str(self.root_dir))
+            ]
+            env["Path"] = os.pathsep.join(filtered_path)
+
+            pixi_env_vars = [
+                "PIXI_PROJECT_ROOT",
+                "PIXI_PROJECT_NAME",
+                "PIXI_PROJECT_MANIFEST",
+                "PIXI_PROJECT_VERSION",
+                "PIXI_PROMPT",
+                "PIXI_ENVIRONMENT_NAME",
+                "PIXI_ENVIRONMENT_PLATFORMS",
+                "CONDA_PREFIX",
+                "CONDA_DEFAULT_ENV",
+                "INIT_CWD",
+            ]
+
+            for pixi_var in pixi_env_vars:
+                if pixi_var in env:
+                    del env[pixi_var]
+
+            # Add json url to the environment. This will be used in the conf.py file
+            env["JSON_URL"] = f"{self.baseurl}/{self.json_location}"
+
+            # Build the documentation of the branch
+            print("Start sphinx-build.")
+            _ = subprocess.run(
+                ["pixi", "run", "--frozen", "install"],
+                cwd=self.work_dir,
+                env=env,
+                check=True,
+            )
+            _ = subprocess.run(
+                [
+                    "pixi",
+                    "run",
+                    "--frozen",
+                    "sphinx-build",
+                    "-M",
+                    "html",
+                    local_source_dir,
+                    local_build_dir,
+                ],
+                cwd=self.work_dir,
+                env=env,
+                check=True,
+            )
+
+            # Collect the branch documentation and add it to the
+            print("Move documentation to correct location.")
+            branch_html_dir = local_build_dir / "html"
+            shutil.rmtree(self.doc_dir / version, ignore_errors=True)
+            shutil.copytree(branch_html_dir, self.doc_dir / version)
+
+    def list_versions(self):
+        print(self._get_existing_versions())
+
+    def create_switcher(self):
+        self._build_switcher()
+
+    def _build_switcher(self):
+        switcher = SwitcherBuilder(self._get_existing_versions(), self.baseurl)
+        version_info = switcher.build()
+
+        template = jinja2.Template("""{{ version_info | tojson(indent=4) }}""")
+        rendered_document = template.render(version_info=version_info)
+
+        json_path = self.doc_dir / self.json_location
+        os.makedirs(os.path.dirname(json_path), exist_ok=True)
+        with open(json_path, "w") as fh:
+            fh.write(rendered_document)
+
+    def _get_existing_versions(self):
+        ignore = ["_static"]
+        versions = [
+            name
+            for name in os.listdir(self.doc_dir)
+            if os.path.isdir(self.doc_dir / name) and name not in ignore
+        ]
+        return versions
+
+
+class GitWorktreeManager:
+    def __init__(self, repo, work_dir, branch_or_tag):
+        self.repo = repo
+        self.work_dir = work_dir
+        self.branch_or_tag = branch_or_tag
+
+    def __enter__(self):
+        self.repo.git.execute(
+            ["git", "worktree", "add", f"{self.work_dir}", self.branch_or_tag]
+        )
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        try:
+            self.repo.git.execute(
+                ["git", "worktree", "remove", f"{self.work_dir}", "--force"]
+            )
+        except Exception:
+            print("Warning: could not remove the worktree")
+
+
+class SwitcherBuilder:
+    def __init__(self, versions, baseurl):
+        self._versions = versions
+        self._versions.sort(reverse=True)
+        self.baseurl = baseurl
+
+    @property
+    def latest_stable_version(self):
+        dev_branch = ["master"]
+        filtered_versions = [
+            version
+            for version in self._versions
+            if version not in dev_branch
+            and not packaging.version.Version(version).is_prerelease
+        ]
+        latest_version = (
+            max(filtered_versions, key=packaging.version.parse)
+            if filtered_versions
+            else None
+        )
+
+        return latest_version
+
+    @property
+    def versions(self):
+        return self._versions
+
+    def build(self):
+        version_info = []
+        for version in self.versions:
+            version_info += [
+                {
+                    "name": self._version_to_name(version),
+                    "version": version,
+                    "url": f"{self.baseurl}/{version}",
+                    "preferred": version == self.latest_stable_version,
+                }
+            ]
+
+        return version_info
+
+    def _version_to_name(self, version):
+        name_postfix = ""
+        if version == "master":
+            name_postfix = "(latest)"
+        if version == self.latest_stable_version:
+            name_postfix = "(stable)"
+
+        name = " ".join([version, name_postfix])
+        return name
+
+
+if __name__ == "__main__":
+    MultiDoc()