More SpatiaLite details on /-/versions, closes #1607

datasette/app.py

@@ -46,6 +46,7 @@ from .database import Database, QueryInterrupted
 
 from .utils import (
     PrefixedUrlString,
+    SPATIALITE_FUNCTIONS,
     StartupError,
     add_cors_headers,
     async_call_with_supported_arguments,
@@ -724,6 +725,17 @@ class Datasette:
                     sqlite_extensions[extension] = None
             except Exception:
                 pass
+        # More details on SpatiaLite
+        if "spatialite" in sqlite_extensions:
+            spatialite_details = {}
+            for fn in SPATIALITE_FUNCTIONS:
+                try:
+                    result = conn.execute("select {}()".format(fn))
+                    spatialite_details[fn] = result.fetchone()[0]
+                except Exception as e:
+                    spatialite_details[fn] = {"error": str(e)}
+            sqlite_extensions["spatialite"] = spatialite_details
+
         # Figure out supported FTS versions
         fts_versions = []
         for fts in ("FTS5", "FTS4", "FTS3"):

datasette/utils/__init__.py

@@ -52,9 +52,41 @@ SPATIALITE_PATHS = (
     "/usr/local/lib/mod_spatialite.dylib",
     "/usr/local/lib/mod_spatialite.so",
 )
+# Used to display /-/versions.json SpatiaLite information
+SPATIALITE_FUNCTIONS = (
+    "spatialite_version",
+    "spatialite_target_cpu",
+    "check_strict_sql_quoting",
+    "freexl_version",
+    "proj_version",
+    "geos_version",
+    "rttopo_version",
+    "libxml2_version",
+    "HasIconv",
+    "HasMathSQL",
+    "HasGeoCallbacks",
+    "HasProj",
+    "HasProj6",
+    "HasGeos",
+    "HasGeosAdvanced",
+    "HasGeosTrunk",
+    "HasGeosReentrant",
+    "HasGeosOnlyReentrant",
+    "HasMiniZip",
+    "HasRtTopo",
+    "HasLibXML2",
+    "HasEpsg",
+    "HasFreeXL",
+    "HasGeoPackage",
+    "HasGCP",
+    "HasTopology",
+    "HasKNN",
+    "HasRouting",
+)
 # Length of hash subset used in hashed URLs:
 HASH_LENGTH = 7
 
+
 # Can replace this with Column from sqlite_utils when I add that dependency
 Column = namedtuple(
     "Column", ("cid", "name", "type", "notnull", "default_value", "is_pk", "hidden")