Reintroduce tree-sitter-languages.

It seem to be active again, with proper builds, and a newer version of
tree-sitter-rst. It allow to not have to do the build-parser step

.github/workflows/python-package.yml

@@ -47,11 +47,12 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r requirements-dev.txt
         flit install --symlink
-        git clone  https://github.com/stsewd/tree-sitter-rst
-        cd tree-sitter-rst
-        git checkout 3fc88d2097bc854ab6bf70c52b3c482849cf8e8f
-        cd -
-        papyri build-parser
+        # this is not needed if tree-sitter-languages works
+        #git clone  https://github.com/stsewd/tree-sitter-rst
+        #cd tree-sitter-rst
+        #git checkout 3fc88d2097bc854ab6bf70c52b3c482849cf8e8f
+        #cd -
+        #papyri build-parser
     - name: dependency tree
       run: |
         pipdeptree

papyri/ts.py

@@ -4,7 +4,6 @@
 from textwrap import dedent, indent
 from typing import List, Any, Dict
 
-from tree_sitter import Language, Parser
 
 from .myst_ast import (
     MText,
@@ -46,16 +45,25 @@
 allowed_adorn = "=-`:.'\"~^_*+#<>"
 pth = str(Path(__file__).parent / "rst.so")
 
-# replace by tree-sitter-languages once it works See https://github.com/grantjenks/py-tree-sitter-languages/issues/15
 try:
-    RST = Language(pth, "rst")
-except OSError as e:
-    raise OSError(
-        "tree-sitter-rst not found, rst parsing will not work. Please run `papyri build-parser`"
-    ) from e
-
-parser = Parser()
-parser.set_language(RST)
+    from tree_sitter_languages import get_language, get_parser
+
+    # language = get_language('python')
+    parser = get_parser("rst")
+except ModuleNotFoundError:
+    # replace by tree-sitter-languages once it works See https://github.com/grantjenks/py-tree-sitter-languages/issues/15
+    try:
+        from tree_sitter import Language, Parser
+
+        RST = Language(pth, "rst")
+    except OSError as e:
+        raise OSError(
+            "tree-sitter-rst not found, rst parsing will not work. Please run `papyri build-parser`"
+        ) from e
+
+    parser = Parser()
+    parser.set_language(RST)
+
 log = logging.getLogger("papyri")