Support opening multiple databases with the same stem

[simonw]

e.g. I should be able to do this:

datasette App/data.db Other_App/data.db

This currently errors because you can't have two databases taking the /data URL path.

Instead, how about in this particular case assigning the second database /data-1?

[simonw]

Experimental exploratory patch:

diff --git a/datasette/app.py b/datasette/app.py
index 2ef7da4..ca51866 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -164,8 +164,10 @@ class Datasette:
                 is_memory = True
             is_mutable = path not in self.immutables
             db = Database(self, path, is_mutable=is_mutable, is_memory=is_memory)
+            i = 1
             if db.name in self.databases:
-                raise Exception("Multiple files with same stem: {}".format(db.name))
+                db.stem = db.name + "-" + str(i)
+                i += 1
             self.databases[db.name] = db
         self.cache_headers = cache_headers
         self.cors = cors
diff --git a/datasette/database.py b/datasette/database.py
index e491577..75c8681 100644
--- a/datasette/database.py
+++ b/datasette/database.py
@@ -14,6 +14,8 @@ from .inspect import inspect_hash
 
 
 class Database:
+    stem = None
+
     def __init__(self, ds, path=None, is_mutable=False, is_memory=False):
         self.ds = ds
         self.path = path
@@ -73,6 +75,8 @@ class Database:
     def name(self):
         if self.is_memory:
             return ":memory:"
+        elif self.stem:
+            return self.stem
         else:
             return Path(self.path).stem

[simonw]

Related problem caused by the new _schemas database - if a user attempts to open their own _schemas.db file it will fail. I'd like to open and mount that as /_schemas_ instead.

[simonw]

I'm fixing this in #1155.

[simonw]

If you open multiple files with the same filename, e.g. like this:

datasette fixtures.db templates/fixtures.db plugins/fixtures.db

You'll now get this: