1 files changed, 94 insertions, 0 deletions
diff --git a/sphinx/builders/text.py b/sphinx/builders/text.py
new file mode 100644
index 0000000..43a8d1f
--- /dev/null
+++ b/sphinx/builders/text.py
@@ -0,0 +1,94 @@
+"""Plain-text Sphinx builder."""
+
+from __future__ import annotations
+
+from os import path
+from typing import TYPE_CHECKING, Any
+
+from docutils.io import StringOutput
+
+from sphinx.builders import Builder
+from sphinx.locale import __
+from sphinx.util import logging
+from sphinx.util.osutil import ensuredir, os_path
+from sphinx.writers.text import TextTranslator, TextWriter
+
+if TYPE_CHECKING:
+    from collections.abc import Iterator
+
+    from docutils.nodes import Node
+
+    from sphinx.application import Sphinx
+
+logger = logging.getLogger(__name__)
+
+
+class TextBuilder(Builder):
+    name = 'text'
+    format = 'text'
+    epilog = __('The text files are in %(outdir)s.')
+
+    out_suffix = '.txt'
+    allow_parallel = True
+    default_translator_class = TextTranslator
+
+    current_docname: str | None = None
+
+    def init(self) -> None:
+        # section numbers for headings in the currently visited document
+        self.secnumbers: dict[str, tuple[int, ...]] = {}
+
+    def get_outdated_docs(self) -> Iterator[str]:
+        for docname in self.env.found_docs:
+            if docname not in self.env.all_docs:
+                yield docname
+                continue
+            targetname = path.join(self.outdir, docname + self.out_suffix)
+            try:
+                targetmtime = path.getmtime(targetname)
+            except Exception:
+                targetmtime = 0
+            try:
+                srcmtime = path.getmtime(self.env.doc2path(docname))
+                if srcmtime > targetmtime:
+                    yield docname
+            except OSError:
+                # source doesn't exist anymore
+                pass
+
+    def get_target_uri(self, docname: str, typ: str | None = None) -> str:
+        return ''
+
+    def prepare_writing(self, docnames: set[str]) -> None:
+        self.writer = TextWriter(self)
+
+    def write_doc(self, docname: str, doctree: Node) -> None:
+        self.current_docname = docname
+        self.secnumbers = self.env.toc_secnumbers.get(docname, {})
+        destination = StringOutput(encoding='utf-8')
+        self.writer.write(doctree, destination)
+        outfilename = path.join(self.outdir, os_path(docname) + self.out_suffix)
+        ensuredir(path.dirname(outfilename))
+        try:
+            with open(outfilename, 'w', encoding='utf-8') as f:
+                f.write(self.writer.output)
+        except OSError as err:
+            logger.warning(__("error writing file %s: %s"), outfilename, err)
+
+    def finish(self) -> None:
+        pass
+
+
+def setup(app: Sphinx) -> dict[str, Any]:
+    app.add_builder(TextBuilder)
+
+    app.add_config_value('text_sectionchars', '*=-~"+`', 'env')
+    app.add_config_value('text_newlines', 'unix', 'env')
+    app.add_config_value('text_add_secnumbers', True, 'env')
+    app.add_config_value('text_secnumber_suffix', '. ', 'env')
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }