From eed37234bcb4978476d71a0a92edc5a72b25d352 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Melissa=20Weber=20Mendon=C3=A7a?= <melissawm@gmail.com>
Date: Sat, 11 Nov 2023 18:37:12 -0300
Subject: [PATCH] Improve error message for tree-sitter not found

Raise exception with better error message when tree-sitter is not properly installed
---
 papyri/ts.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/papyri/ts.py b/papyri/ts.py
index c2652d29..c03a942a 100644
--- a/papyri/ts.py
+++ b/papyri/ts.py
@@ -46,7 +46,13 @@
 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
-RST = Language(pth, "rst")
+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)
 log = logging.getLogger("papyri")