refactor: Change extension entrypoint to sphinxnotes.snippet (2nd)

docs/conf.py

@@ -152,7 +152,7 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('../src/sphinxnotes'))
-extensions.append('snippet.ext')
+extensions.append('snippet')
 
 # DOG FOOD CONFIGURATION START
 

src/sphinxnotes/snippet/__init__.py

@@ -2,197 +2,35 @@
 sphinxnotes.snippet
 ~~~~~~~~~~~~~~~~~~~
 
-:copyright: Copyright 2020 Shengyu Zhang
+Sphinx extension entrypoint.
+
+:copyright: Copyright 2024 Shengyu Zhang
 :license: BSD, see LICENSE for details.
 """
 
-from __future__ import annotations
-from typing import List, Tuple, Optional, TYPE_CHECKING
-import itertools
-from os import path
-
-from docutils import nodes
-
-if TYPE_CHECKING:
-    from sphinx.environment import BuildEnvironment
-
-__version__ = '1.1.1'
-
-
-class Snippet(object):
-    """
-    Snippet is base class of reStructuredText snippet.
-
-    :param nodes: Document nodes that make up this snippet
-    """
-
-    #: docname where the snippet is located, can be referenced by
-    # :rst:role:`doc`.
-    docname: str
-
-    #: Absolute path of the source file.
-    file: str
-
-    #: Line number range of snippet, in the source file which is left closed
-    #: and right opened.
-    lineno: Tuple[int, int]
-
-    #: The original reStructuredText of snippet
-    rst: List[str]
-
-    #: The possible identifier key of snippet, which is picked from nodes'
-    #: (or nodes' parent's) `ids attr`_.
-    #:
-    #: .. _ids attr: https://docutils.sourceforge.io/docs/ref/doctree.html#ids
-    refid: Optional[str]
-
-    def __init__(self, *nodes: nodes.Node) -> None:
-        assert len(nodes) != 0
-
-        env: BuildEnvironment = nodes[0].document.settings.env
-        self.file = nodes[0].source
-        self.docname = env.path2doc(self.file)
-
-        lineno = [float('inf'), -float('inf')]
-        for node in nodes:
-            if not node.line:
-                continue  # Skip node that have None line, I dont know why
-            lineno[0] = min(lineno[0], _line_of_start(node))
-            lineno[1] = max(lineno[1], _line_of_end(node))
-        self.lineno = lineno
-
-        lines = []
-        with open(self.file, 'r') as f:
-            start = self.lineno[0] - 1
-            stop = self.lineno[1] - 1
-            for line in itertools.islice(f, start, stop):
-                lines.append(line.strip('\n'))
-        self.rst = lines
-
-        # Find exactly one ID attr in nodes
-        self.refid = None
-        for node in nodes:
-            if node['ids']:
-                self.refid = node['ids'][0]
-                break
-
-        # If no ID found, try parent
-        if not self.refid:
-            for node in nodes:
-                if node.parent['ids']:
-                    self.refid = node.parent['ids'][0]
-                    break
-
-
-class Text(Snippet):
-    #: Text of snippet
-    text: str
-
-    def __init__(self, node: nodes.Node) -> None:
-        super().__init__(node)
-        self.text = node.astext()
-
-
-class CodeBlock(Text):
-    #: Language of code block
-    language: str
-    #: Caption of code block
-    caption: Optional[str]
-
-    def __init__(self, node: nodes.literal_block) -> None:
-        assert isinstance(node, nodes.literal_block)
-        super().__init__(node)
-        self.language = node['language']
-        self.caption = node.get('caption')
-
-
-class WithCodeBlock(object):
-    code_blocks: List[CodeBlock]
-
-    def __init__(self, nodes: nodes.Nodes) -> None:
-        self.code_blocks = []
-        for n in nodes.traverse(nodes.literal_block):
-            self.code_blocks.append(self.CodeBlock(n))
-
-
-class Title(Text):
-    def __init__(self, node: nodes.title) -> None:
-        assert isinstance(node, nodes.title)
-        super().__init__(node)
-
-
-class WithTitle(object):
-    title: Optional[Title]
-
-    def __init__(self, node: nodes.Node) -> None:
-        title_node = node.next_node(nodes.title)
-        self.title = Title(title_node) if title_node else None
-
-
-class Section(Snippet, WithTitle):
-    def __init__(self, node: nodes.section) -> None:
-        assert isinstance(node, nodes.section)
-        Snippet.__init__(self, node)
-        WithTitle.__init__(self, node)
-
-
-class Document(Section):
-    #: A set of absolute paths of dependent files for document.
-    #: Obtained from :attr:`BuildEnvironment.dependencies`.
-    deps: set[str]
-
-    def __init__(self, node: nodes.document) -> None:
-        assert isinstance(node, nodes.document)
-        super().__init__(node.next_node(nodes.section))
-
-        # Record document's dependent files
-        self.deps = set()
-        env: BuildEnvironment = node.settings.env
-        for dep in env.dependencies[self.docname]:
-            # Relative to documentation root -> Absolute path of file system.
-            self.deps.add(path.join(env.srcdir, dep))
-
-
-################
-# Nodes helper #
-################
-
-
-def _line_of_start(node: nodes.Node) -> int:
-    assert node.line
-    if isinstance(node, nodes.title):
-        if isinstance(node.parent.parent, nodes.document):
-            # Spceial case for Document Title / Subtitle
-            return 1
-        else:
-            # Spceial case for section title
-            return node.line - 1
-    elif isinstance(node, nodes.section):
-        if isinstance(node.parent, nodes.document):
-            # Spceial case for top level section
-            return 1
-        else:
-            # Spceial case for section
-            return node.line - 1
-    return node.line
-
 
-def _line_of_end(node: nodes.Node) -> Optional[int]:
-    next_node = node.next_node(descend=False, siblings=True, ascend=True)
-    while next_node:
-        if next_node.line:
-            return _line_of_start(next_node)
-        next_node = next_node.next_node(
-            # Some nodes' line attr is always None, but their children has
-            # valid line attr
-            descend=True,
-            # If node and its children have not valid line attr, try use line
-            # of next node
-            ascend=True,
-            siblings=True,
-        )
-    # No line found, return the max line of source file
-    if node.source:
-        with open(node.source) as f:
-            return sum(1 for line in f)
-    raise AttributeError('None source attr of node %s' % node)
+def setup(app):
+    # **WARNING**: We don't import these packages globally, because the current
+    # package (sphinxnotes.snippet) is always resloved when importing
+    # sphinxnotes.snippet.*. If we import packages here, eventually we will
+    # load a lot of packages from the Sphinx. It will seriously **SLOW DOWN**
+    # the startup time of our CLI tool (sphinxnotes.snippet.cli).
+    #
+    # .. seealso:: https://github.com/sphinx-notes/snippet/pull/31
+    from .ext import (
+        SnippetBuilder,
+        on_config_inited,
+        on_env_get_outdated,
+        on_doctree_resolved,
+        on_builder_finished,
+    )
+
+    app.add_builder(SnippetBuilder)
+
+    app.add_config_value('snippet_config', {}, '')
+    app.add_config_value('snippet_patterns', {'*': ['.*']}, '')
+
+    app.connect('config-inited', on_config_inited)
+    app.connect('env-get-outdated', on_env_get_outdated)
+    app.connect('doctree-resolved', on_doctree_resolved)
+    app.connect('build-finished', on_builder_finished)

src/sphinxnotes/snippet/cache.py

@@ -9,7 +9,7 @@
 from typing import List, Tuple, Dict, Optional
 from dataclasses import dataclass
 
-from . import Snippet
+from .snippets import Snippet
 from .utils.pdict import PDict
 
 

src/sphinxnotes/snippet/cli.py

@@ -2,10 +2,15 @@
 sphinxnotes.snippet.cli
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-:copyright: Copyright 2020 Shengyu Zhang
+Command line entrypoint.
+
+:copyright: Copyright 2024 Shengyu Zhang
 :license: BSD, see LICENSE for details.
 """
 
+# **NOTE**: Import new packages with caution:
+# Importing complex packages (like sphinx.*) will directly slow down the
+# startup of the CLI tool.
 from __future__ import annotations
 import sys
 import argparse
@@ -16,9 +21,8 @@
 import posixpath
 
 from xdg.BaseDirectory import xdg_config_home
-from sphinx.util.matching import patmatch
 
-from . import __version__, Document
+from .snippets import Document
 from .config import Config
 from .cache import Cache, IndexID, Index
 from .table import tablify, COLUMNS
@@ -39,7 +43,7 @@ def get_integration_file(fn: str) -> str:
     .. seealso::
 
        see ``[tool.setuptools.package-data]`` section of pyproject.toml to know
-        how files are included.
+       how files are included.
     """
     # TODO: use https://docs.python.org/3/library/importlib.resources.html#importlib.resources.files
     prefix = path.abspath(path.dirname(__file__))
@@ -61,7 +65,11 @@ def main(argv: List[str] = sys.argv[1:]):
                                        * (any)               wildcard for any snippet"""),
     )
     parser.add_argument(
-        '-v', '--version', action='version', version='%(prog)s ' + __version__
+        '--version',
+        # add_argument provides action='version', but it requires a version
+        # literal and doesn't support lazily obtaining version.
+        action='store_true',
+        help="show program's version number and exit",
     )
     parser.add_argument(
         '-c', '--config', default=DEFAULT_CONFIG_FILE, help='path to configuration file'
@@ -176,6 +184,16 @@ def main(argv: List[str] = sys.argv[1:]):
     # Parse command line arguments
     args = parser.parse_args(argv)
 
+    # Print version message.
+    # See parser.add_argument('--version', ...) for more detais.
+    if args.version:
+        # NOTE: Importing is slow, do it on demand.
+        from importlib.metadata import version
+
+        pkgname = 'sphinxnotes.snippet'
+        print(pkgname, version(pkgname))
+        parser.exit()
+
     # Load config from file
     if args.config == DEFAULT_CONFIG_FILE and not path.isfile(DEFAULT_CONFIG_FILE):
         print(
@@ -219,6 +237,9 @@ def _on_command_stat(args: argparse.Namespace):
 def _filter_list_items(
     cache: Cache, tags: str, docname_glob: str
 ) -> Iterable[Tuple[IndexID, Index]]:
+    # NOTE: Importing is slow, do it on demand.
+    from sphinx.util.matching import patmatch
+
     for index_id, index in cache.indexes.items():
         # Filter by tags.
         if index[0] not in tags and '*' not in tags:

src/sphinxnotes/snippet/ext.py

@@ -1,10 +1,10 @@
 """
-sphinxnotes.ext.snippet
+sphinxnotes.snippet.ext
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-Sphinx extension for sphinxnotes.snippet.
+Sphinx extension implementation, but the entrypoint is located at __init__.py.
 
-:copyright: Copyright 2021 Shengyu Zhang
+:copyright: Copyright 2024 Shengyu Zhang
 :license: BSD, see LICENSE for details.
 """
 
@@ -26,7 +26,7 @@
     from collections.abc import Iterator
 
 from .config import Config
-from . import Snippet, WithTitle, Document, Section
+from .snippets import Snippet, WithTitle, Document, Section
 from .picker import pick
 from .cache import Cache, Item
 from .keyword import Extractor
@@ -206,15 +206,3 @@ def _format_modified_time(timestamp: float) -> str:
     """Return an RFC 3339 formatted string representing the given timestamp."""
     seconds, fraction = divmod(timestamp, 1)
     return time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(seconds)) + f'.{fraction:.3f}'
-
-
-def setup(app: Sphinx):
-    app.add_builder(SnippetBuilder)
-
-    app.add_config_value('snippet_config', {}, '')
-    app.add_config_value('snippet_patterns', {'*': ['.*']}, '')
-
-    app.connect('config-inited', on_config_inited)
-    app.connect('env-get-outdated', on_env_get_outdated)
-    app.connect('doctree-resolved', on_doctree_resolved)
-    app.connect('build-finished', on_builder_finished)

src/sphinxnotes/snippet/picker.py

@@ -15,7 +15,7 @@
 
 from sphinx.util import logging
 
-from . import Snippet, Section, Document
+from .snippets import Snippet, Section, Document
 
 if TYPE_CHECKING:
     from sphinx.application import Sphinx