add man page backend to refman

2 files changed, 385 insertions, 1 deletions

diff --git a/docs/refman/generatorman.py b/docs/refman/generatorman.py
new file mode 100644
index 0000000..dfd211f
--- /dev/null
+++ b/docs/refman/generatorman.py
@@ -0,0 +1,382 @@
+import re
+from pathlib import Path
+
+from .generatorbase import GeneratorBase
+from .model import (
+    ReferenceManual,
+    Function,
+    Object,
+    PosArg,
+    VarArgs,
+    Kwarg,
+)
+
+import typing as T
+
+
+class ManPage:
+    def __init__(self, path: Path):
+        self.path = path
+        self.text = ""
+
+    def reset_font(self) -> None:
+        self.text += ".P\n"
+
+    def title(self, name: str, section: int) -> None:
+        import datetime
+
+        date = datetime.date.today()
+        self.reset_font()
+        self.text += f'.TH "{name}" "{section}" "{date}"\n'
+
+    def section(self, name: str) -> None:
+        self.reset_font()
+        self.text += f".SH {name}\n"
+
+    def subsection(self, name: str) -> None:
+        self.reset_font()
+        self.text += f".SS {name}\n"
+
+    def par(self, text: str) -> None:
+        self.reset_font()
+        self.text += f"{text}\n"
+
+    def indent(self, amount: int = 4) -> None:
+        self.text += f".RS {amount}\n"
+
+    def unindent(self) -> None:
+        self.text += ".RE\n"
+
+    def br(self) -> None:
+        self.text += ".br\n"
+
+    def nl(self) -> None:
+        self.text += "\n"
+
+    def line(self, text: str) -> None:
+        if text and text[0] in [".", "'"]:
+            self.text += "\\"
+        self.text += f"{text}\n"
+
+    def inline(self, text: str) -> None:
+        self.text += f"{text}"
+
+    def write(self) -> None:
+        self.path.write_text(self.text, encoding="utf-8")
+
+    @staticmethod
+    def bold(text: str) -> str:
+        return f"\\fB{text}\\fR"
+
+    @staticmethod
+    def italic(text: str) -> str:
+        return f"\\fI{text}\\fR"
+
+
+class GeneratorMan(GeneratorBase):
+    def __init__(
+        self, manual: ReferenceManual, out: Path, enable_modules: bool
+    ) -> None:
+        super().__init__(manual)
+        self.out = out
+        self.enable_modules = enable_modules
+        self.links: T.List[str] = []
+
+    def generate_description(self, page: ManPage, desc: str) -> None:
+        def italicise(match: T.Match[str]) -> str:
+            v = match.group(1)
+            if v[0] == "@":
+                v = v[1:]
+
+            return ManPage.italic(v)
+
+        desc = re.sub(re.compile(r"\[\[(.*?)\]\]", re.DOTALL), italicise, desc)
+
+        def linkify(match: T.Match[str]) -> str:
+            replacement = ManPage.italic(match.group(1))
+
+            if match.group(2)[0] != "#":
+                if match.group(2) in self.links:
+                    num = self.links.index(match.group(2))
+                else:
+                    self.links.append(match.group(2))
+                    num = len(self.links)
+
+                replacement += f"[{num}]"
+
+            return replacement
+
+        desc = re.sub(re.compile(r"\[(.*?)\]\((.*?)\)", re.DOTALL), linkify, desc)
+
+        def bold(match: T.Match[str]) -> str:
+            return ManPage.bold(match.group(1))
+
+        desc = re.sub(re.compile(r"\*(.*?)\*"), bold, desc)
+
+        isCode = False
+        for chunk in desc.split("```"):
+            if isCode:
+                page.indent()
+                lines = chunk.strip().split("\n")
+                if lines[0] == "meson":
+                    lines = lines[1:]
+
+                for line in lines:
+                    page.line(line)
+                    page.br()
+                page.unindent()
+            else:
+                inList = False
+                for line in chunk.strip().split("\n"):
+                    if len(line) == 0:
+                        page.nl()
+                        if inList:
+                            page.nl()
+                            inList = False
+                    elif line[0:2] in ["- ", "* "]:
+                        if inList:
+                            page.nl()
+                            page.br()
+                        else:
+                            inList = True
+
+                        page.inline(line.strip() + " ")
+                    elif inList and line[0] == " ":
+                        page.inline(line.strip() + " ")
+                    else:
+                        inList = False
+                        page.line(line)
+
+                if inList:
+                    page.nl()
+
+            isCode = not isCode
+
+    def function_name(self, f: Function, o: Object = None) -> str:
+        name = ""
+        if o is not None:
+            name += f"{o.name}."
+
+        name += f.name
+        return name
+
+    def generate_function_signature(
+        self, page: ManPage, f: Function, o: Object = None
+    ) -> None:
+        args = []
+
+        if f.posargs:
+            args += [arg.name for arg in f.posargs]
+
+        if f.varargs:
+            args += [f.varargs.name + "..."]
+
+        if f.optargs:
+            args += [f"[{arg.name}]" for arg in f.optargs]
+
+        for kwarg in self.sorted_and_filtered(list(f.kwargs.values())):
+            kw = kwarg.name + ":"
+            if kwarg.default:
+                kw += " " + ManPage.bold(kwarg.default)
+            args += [kw]
+
+        ret = ManPage.italic(f.returns.raw) + " "
+
+        prefix = f"{ret}{self.function_name(f, o)}("
+        sig = ", ".join(args)
+        suffix = ")"
+
+        if len(prefix) + len(sig) + len(suffix) > 70:
+            page.line(prefix)
+            page.br()
+            page.indent()
+            for arg in args:
+                page.line(arg + ",")
+                page.br()
+            page.unindent()
+            page.line(suffix)
+        else:
+            page.line(prefix + sig + suffix)
+
+    def base_info(
+        self, x: T.Union[PosArg, VarArgs, Kwarg, Function, Object]
+    ) -> T.List[str]:
+        info = []
+        if x.deprecated:
+            info += [ManPage.bold("deprecated") + f" since {x.deprecated}"]
+        if x.since:
+            info += [f"since {x.since}"]
+
+        return info
+
+    def generate_function_arg(
+        self,
+        page: ManPage,
+        arg: T.Union[PosArg, VarArgs, Kwarg],
+        isOptarg: bool = False,
+    ) -> None:
+        required = (
+            arg.required
+            if isinstance(arg, Kwarg)
+            else not isOptarg and not isinstance(arg, VarArgs)
+        )
+
+        page.line(ManPage.bold(arg.name))
+
+        info = [ManPage.italic(arg.type.raw)]
+
+        if required:
+            info += [ManPage.bold("required")]
+        if isinstance(arg, (PosArg, Kwarg)) and arg.default:
+            info += [f"default: {arg.default}"]
+        if isinstance(arg, VarArgs):
+            mn = 0 if arg.min_varargs < 0 else arg.min_varargs
+            mx = "N" if arg.max_varargs < 0 else arg.max_varargs
+            info += [f"{mn}...{mx} times"]
+
+        info += self.base_info(arg)
+
+        page.line(", ".join(info))
+
+        page.br()
+        page.indent(2)
+        self.generate_description(page, arg.description.strip())
+        page.unindent()
+        page.nl()
+
+    def generate_function_argument_section(
+        self,
+        page: ManPage,
+        name: str,
+        args: T.Sequence[T.Union[PosArg, VarArgs, Kwarg]],
+        isOptarg: bool = False,
+    ) -> None:
+        if not args:
+            return
+
+        page.line(ManPage.bold(name))
+        page.indent()
+        for arg in args:
+            self.generate_function_arg(page, arg, isOptarg)
+        page.unindent()
+
+    def generate_sub_sub_section(
+        self, page: ManPage, name: str, text: T.List[str], process: bool = True
+    ) -> None:
+        page.line(ManPage.bold(name))
+        page.indent()
+        if process:
+            for line in text:
+                self.generate_description(page, line.strip())
+        else:
+            page.line("\n\n".join([line.strip() for line in text]))
+        page.unindent()
+
+    def generate_function(self, page: ManPage, f: Function, obj: Object = None) -> None:
+        page.subsection(self.function_name(f, obj) + "()")
+        page.indent(0)
+
+        page.line(ManPage.bold("SYNOPSIS"))
+        page.indent()
+        self.generate_function_signature(page, f, obj)
+
+        info = self.base_info(f)
+        if info:
+            page.nl()
+            page.line(", ".join(info))
+        page.unindent()
+        page.nl()
+
+        self.generate_sub_sub_section(page, "DESCRIPTION", [f.description])
+        page.nl()
+
+        self.generate_function_argument_section(page, "POSARGS", f.posargs)
+        if f.varargs:
+            self.generate_function_argument_section(page, "VARARGS", [f.varargs])
+        self.generate_function_argument_section(page, "OPTARGS", f.optargs, True)
+        self.generate_function_argument_section(
+            page, "KWARGS", self.sorted_and_filtered(list(f.kwargs.values()))
+        )
+
+        if f.notes:
+            self.generate_sub_sub_section(page, "NOTES", f.notes)
+        if f.warnings:
+            self.generate_sub_sub_section(page, "WARNINGS", f.warnings)
+        if f.example:
+            self.generate_sub_sub_section(page, "EXAMPLE", [f.example])
+
+        page.unindent()
+
+    def generate_object(self, page: ManPage, obj: Object) -> None:
+        page.subsection(obj.name)
+        page.indent(2)
+
+        info = self.base_info(obj)
+        if info:
+            page.line(", ".join(info))
+            page.br()
+
+        if obj.extends:
+            page.line(ManPage.bold("extends: ") + obj.extends)
+            page.br()
+
+        ret = [x.name for x in self.sorted_and_filtered(obj.returned_by)]
+        if ret:
+            page.line(ManPage.bold("returned_by: ") + ", ".join(ret))
+            page.br()
+
+        ext = [x.name for x in self.sorted_and_filtered(obj.extended_by)]
+        if ext:
+            page.line(ManPage.bold("extended_by: ") + ", ".join(ext))
+            page.br()
+
+        page.nl()
+
+        self.generate_description(page, obj.description.strip())
+        page.nl()
+
+        if obj.notes:
+            self.generate_sub_sub_section(page, "NOTES", obj.notes)
+        if obj.warnings:
+            self.generate_sub_sub_section(page, "WARNINGS", obj.warnings)
+        if obj.example:
+            self.generate_sub_sub_section(page, "EXAMPLE", [obj.example])
+
+        page.unindent()
+
+    def generate(self) -> None:
+        page = ManPage(self.out)
+
+        page.title("meson-reference", 3)
+
+        page.section("NAME")
+        page.par(
+            f"meson-reference v{self._extract_meson_version()}"
+            + " - a reference for meson functions and objects"
+        )
+
+        page.section("DESCRIPTION")
+        self.generate_description(
+            page,
+            """This manual is divided into two sections, *FUNCTIONS* and *OBJECTS*.  *FUNCTIONS* contains a reference for all meson functions and methods.  Methods are denoted by [[object_name]].[[method_name]]().  *OBJECTS* contains additional information about each object.""",
+        )
+
+        page.section("FUNCTIONS")
+        for f in self.sorted_and_filtered(self.functions):
+            self.generate_function(page, f)
+
+        for obj in self.sorted_and_filtered(self.objects):
+            for f in self.sorted_and_filtered(obj.methods):
+                self.generate_function(page, f, obj)
+
+        page.section("OBJECTS")
+        for obj in self.sorted_and_filtered(self.objects):
+            self.generate_object(page, obj)
+
+        page.section("SEE ALSO")
+        for i in range(len(self.links)):
+            link = self.links[i]
+            page.line(f"[{i + 1}] {link}")
+            page.br()
+
+        page.write()
diff --git a/docs/refman/main.py b/docs/refman/main.py
index 5bc40f7..e2654c9 100644
--- a/docs/refman/main.py
+++ b/docs/refman/main.py
@@ -27,13 +27,14 @@ from .generatorjson import GeneratorJSON
 from .generatorprint import GeneratorPrint
 from .generatorpickle import GeneratorPickle
 from .generatormd import GeneratorMD
+from .generatorman import GeneratorMan
 
 meson_root = Path(__file__).absolute().parents[2]
 
 def main() -> int:
     parser = argparse.ArgumentParser(description='Meson reference manual generator')
     parser.add_argument('-l', '--loader', type=str, default='yaml', choices=['yaml', 'pickle'], help='Information loader backend')
-    parser.add_argument('-g', '--generator', type=str, choices=['print', 'pickle', 'md', 'json'], required=True, help='Generator backend')
+    parser.add_argument('-g', '--generator', type=str, choices=['print', 'pickle', 'md', 'json', 'man'], required=True, help='Generator backend')
     parser.add_argument('-s', '--sitemap', type=Path, default=meson_root / 'docs' / 'sitemap.txt', help='Path to the input sitemap.txt')
     parser.add_argument('-o', '--out', type=Path, required=True, help='Output directory for generated files')
     parser.add_argument('-i', '--input', type=Path, default=meson_root / 'docs' / 'yaml', help='Input path for the selected loader')
@@ -59,6 +60,7 @@ def main() -> int:
         'pickle': lambda: GeneratorPickle(refMan, args.out),
         'md': lambda: GeneratorMD(refMan, args.out, args.sitemap, args.link_defs, not args.no_modules),
         'json': lambda: GeneratorJSON(refMan, args.out, not args.no_modules),
+        'man': lambda: GeneratorMan(refMan, args.out, not args.no_modules),
     }
     generator = generators[args.generator]()