1 files changed, 42 insertions, 0 deletions
diff --git a/myst_parser/cli.py b/myst_parser/cli.py
new file mode 100644
index 0000000..b9bb1ba
--- /dev/null
+++ b/myst_parser/cli.py
@@ -0,0 +1,42 @@
+import argparse
+import sys
+
+from markdown_it.renderer import RendererHTML
+
+from myst_parser.config.main import MdParserConfig
+from myst_parser.parsers.mdit import create_md_parser
+
+
+def print_anchors(args=None):
+    """ """
+    arg_parser = argparse.ArgumentParser()
+    arg_parser.add_argument(
+        "input",
+        nargs="?",
+        type=argparse.FileType("r", encoding="utf8"),
+        default=sys.stdin,
+        help="Input file (default stdin)",
+    )
+    arg_parser.add_argument(
+        "-o",
+        "--output",
+        type=argparse.FileType("w", encoding="utf8"),
+        default=sys.stdout,
+        help="Output file (default stdout)",
+    )
+    arg_parser.add_argument(
+        "-l", "--level", type=int, default=2, help="Maximum heading level."
+    )
+    args = arg_parser.parse_args(args)
+    parser = create_md_parser(MdParserConfig(heading_anchors=args.level), RendererHTML)
+
+    def _filter_plugin(state):
+        state.tokens = [
+            t
+            for t in state.tokens
+            if t.type.startswith("heading_") and int(t.tag[1]) <= args.level
+        ]
+
+    parser.use(lambda p: p.core.ruler.push("filter", _filter_plugin))
+    text = parser.render(args.input.read())
+    args.output.write(text)