From 04d21ccd089fcaf7a2b535d217fc541ab19aa54b Mon Sep 17 00:00:00 2001
From: Simon Willison <swillison@gmail.com>
Date: Fri, 11 May 2018 10:19:25 -0300
Subject: [PATCH] /-/versions now includes SQLite fts_versions, closes #252

---
 datasette/app.py  | 13 +++++++++++++
 tests/test_api.py |  1 +
 2 files changed, 14 insertions(+)

diff --git a/datasette/app.py b/datasette/app.py
index 2d8547a5..32ef8619 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -1392,6 +1392,18 @@ class Datasette:
                     sqlite_extensions[extension] = None
             except Exception as e:
                 pass
+        # Figure out supported FTS versions
+        fts_versions = []
+        for fts in ('FTS5', 'FTS4', 'FTS3'):
+            try:
+                conn.execute(
+                    'CREATE VIRTUAL TABLE v{fts} USING {fts} (t TEXT)'.format(
+                        fts=fts
+                    )
+                )
+                fts_versions.append(fts)
+            except sqlite3.OperationalError:
+                continue
         return {
             'python': {
                 'version': '.'.join(map(str, sys.version_info[:3])),
@@ -1402,6 +1414,7 @@ class Datasette:
             },
             'sqlite': {
                 'version': sqlite_version,
+                'fts_versions': fts_versions,
                 'extensions': sqlite_extensions,
             }
         }
diff --git a/tests/test_api.py b/tests/test_api.py
index 22ec50ca..30ad13b2 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -864,6 +864,7 @@ def test_versions_json(app_client):
     assert 'version' in response.json['datasette']
     assert 'sqlite' in response.json
     assert 'version' in response.json['sqlite']
+    assert 'fts_versions' in response.json['sqlite']
 
 
 def test_page_size_matching_max_returned_rows(app_client_returend_rows_matches_page_size):