pmaint eclass: add devbook output format

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

3 files changed, 252 insertions, 1 deletions

diff --git a/src/pkgcore/ebuild/eclass.py b/src/pkgcore/ebuild/eclass.py
index f1a0cacd..f5ae214f 100644
--- a/src/pkgcore/ebuild/eclass.py
+++ b/src/pkgcore/ebuild/eclass.py
@@ -720,3 +720,9 @@ class EclassDoc(AttrDict):
         from docutils.writers import html5_polyglot
 
         return self._to_docutils(html5_polyglot.Writer())
+
+    def to_devbook(self):
+        """Convert eclassdoc object to an HTML 5 document."""
+        from pkgcore.util.rst2devbook import DevBookWriter
+
+        return self._to_docutils(DevBookWriter(self.name))
diff --git a/src/pkgcore/scripts/pmaint.py b/src/pkgcore/scripts/pmaint.py
index 390f7b28..9c92f655 100644
--- a/src/pkgcore/scripts/pmaint.py
+++ b/src/pkgcore/scripts/pmaint.py
@@ -501,7 +501,7 @@ eclass_opts.add_argument(
     "--format",
     help="output format",
     default="man",
-    choices=("rst", "man", "html"),
+    choices=("rst", "man", "html", "devbook"),
 )
 eclass_opts.add_argument(
     "-r",
diff --git a/src/pkgcore/util/rst2devbook.py b/src/pkgcore/util/rst2devbook.py
new file mode 100644
index 00000000..f08041cc
--- /dev/null
+++ b/src/pkgcore/util/rst2devbook.py
@@ -0,0 +1,245 @@
+"""A docutils's writer for DevBook format [#]_
+
+.. [#] https://devmanual.gentoo.org/appendices/devbook-guide/index.html
+"""
+
+from docutils import nodes, writers
+
+import lxml.etree as etree
+
+
+class DevBookWriter(writers.Writer):
+    """A docutils writer for DevBook."""
+
+    def __init__(self, eclass):
+        """Initialize the writer. Takes the root element of the resulting
+        DocBook output as its sole argument."""
+        super().__init__()
+        self.eclass = eclass
+
+    def translate(self):
+        """Call the translator to translate the document"""
+        self.visitor = DevBookTranslator(self.document, self.eclass)
+        self.document.walkabout(self.visitor)
+        self.output = self.visitor.astext()
+
+
+class DevBookTranslator(nodes.NodeVisitor):
+    """A docutils translator for DevBook."""
+
+    sections_tags = ("section", "subsection", "subsubsection")
+
+    def __init__(self, document: nodes.document, eclass: str):
+        super().__init__(document)
+        self.eclass = eclass
+
+        self.estack = []
+        self.tb = etree.TreeBuilder()
+        self.section_depth = 0
+
+    def astext(self) -> str:
+        doc = self.tb.close()
+        et = etree.ElementTree(doc)
+        return etree.tostring(
+            et, encoding="utf-8", xml_declaration=True, pretty_print=True
+        ).decode()
+
+    def _push_element(self, name: str, **kwargs):
+        e = self.tb.start(name, kwargs)
+        self.estack.append(e)
+        return e
+
+    def _pop_element(self):
+        e = self.estack.pop()
+        return self.tb.end(e.tag)
+
+    def visit_document(self, node):
+        self.tb.start("guide", {"self": f"eclass-reference/{self.eclass}/"})
+        self.tb.start("chapter", {})
+
+    def depart_document(self, node):
+        self.tb.end("chapter")
+        self.tb.end("guide")
+
+    def visit_Text(self, node):
+        self.tb.data(str(node).replace("\x00", ""))
+
+    def depart_Text(self, node):
+        pass
+
+    def visit_paragraph(self, node):
+        self._push_element("p")
+
+    def depart_paragraph(self, node):
+        self._pop_element()
+
+    def visit_attribution(self, node):
+        self._push_element("p")
+
+    def depart_attribution(self, node):
+        self._pop_element()
+
+    def visit_literal_block(self, node):
+        self._push_element("codesample", lang="ebuild")
+
+    def depart_literal_block(self, node):
+        self._pop_element()
+
+    def visit_literal(self, node):
+        self._push_element("c")
+
+    def depart_literal(self, node):
+        self._pop_element()
+
+    def visit_emphasis(self, node):
+        self._push_element("e")
+
+    def depart_emphasis(self, node):
+        self._pop_element()
+
+    def visit_strong(self, node):
+        self._push_element("b")
+
+    def depart_strong(self, node):
+        self._pop_element()
+
+    def visit_block_quote(self, node):
+        self._push_element("pre")
+
+    def depart_block_quote(self, node):
+        self._pop_element()
+
+    def visit_title(self, node):
+        self._push_element("title")
+
+    def depart_title(self, node):
+        self._pop_element()
+        if self.section_depth > 0:
+            self._push_element("body")
+
+    def visit_section(self, node):
+        if self.estack and self.estack[-1].tag == "body":
+            self._pop_element()
+        self._push_element(self.sections_tags[self.section_depth])
+        self.section_depth += 1
+
+    def depart_section(self, node):
+        self.section_depth -= 1
+        if self.estack[-1].tag == "body":
+            self._pop_element()
+        self._pop_element()
+
+    def visit_title_reference(self, node):
+        pass
+
+    def depart_title_reference(self, node):
+        pass
+
+    def visit_reference(self, node):
+        internal_ref = False
+
+        # internal ref style #1: it declares itself internal
+        if node.hasattr("internal"):
+            internal_ref = node["internal"]
+
+        # internal ref style #2: it hides as an external ref, with strange
+        # qualities.
+        if (
+            node.hasattr("anonymous")
+            and (node["anonymous"] == 1)
+            and node.hasattr("refuri")
+            and (node["refuri"][0] == "_")
+        ):
+            internal_ref = True
+            node["refuri"] = node["refuri"][1:]
+
+        assert not internal_ref
+
+        if node.hasattr("refid"):
+            assert False
+            self._push_element("link", {"linkend": node["refid"]})
+        elif node.hasattr("refuri"):
+            if internal_ref:
+                pass
+                # ref_name = os.path.splitext(node['refuri'])[0]
+                # self._push_element('link', {'linkend': ref_name})
+            else:
+                self._push_element("uri", link=node["refuri"])
+        else:
+            assert False
+
+    def depart_reference(self, node):
+        if node.hasattr("refid") or node.hasattr("refuri"):
+            self._pop_element()
+
+    def visit_bullet_list(self, node):
+        self._push_element("ul")
+
+    def depart_bullet_list(self, node):
+        self._pop_element()
+
+    def visit_enumerated_list(self, node):
+        self._push_element("ol")
+
+    def depart_enumerated_list(self, node):
+        self._pop_element()
+
+    def visit_list_item(self, node):
+        self._push_element("li")
+
+    def depart_list_item(self, node):
+        self._pop_element()
+
+    def visit_line_block(self, node):
+        pass
+
+    def depart_line_block(self, node):
+        pass
+
+    def visit_line(self, node):
+        self._push_element("p")
+
+    def depart_line(self, node):
+        self._pop_element()
+
+    #
+    # Definitions list block
+    #
+
+    def visit_definition_list(self, node):
+        self._push_element("dl")
+
+    def depart_definition_list(self, node):
+        self._pop_element()
+
+    def visit_definition_list_item(self, node):
+        pass
+
+    def depart_definition_list_item(self, node):
+        pass
+
+    def visit_term(self, node):
+        self._push_element("dt")
+
+    def depart_term(self, node):
+        self._pop_element()
+
+    def visit_definition(self, node):
+        self._push_element("dd")
+
+    def depart_definition(self, node):
+        self._pop_element()
+
+    ### Debugging blocks
+
+    def visit_problematic(self, node):
+        self._push_element("warning")
+
+    def depart_problematic(self, node):
+        self._pop_element()
+
+    def visit_system_message(self, node):
+        self._push_element("warning")
+
+    def depart_system_message(self, node):
+        self._pop_element()