Upgrade to Crystal 0.28.0 (#38)

spec/driver_spec.cr

@@ -18,6 +18,17 @@ describe Driver do
 
     assert_filename("sqlite3:/path/to/file.db", "/path/to/file.db")
     assert_filename("sqlite3:///path/to/file.db", "/path/to/file.db")
+
+    {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
+      # Before 0.28.0 the filename had the query string in this case
+      # but it didn't bother when deleting the file in pool_spec.cr.
+      # After 0.28.0 the behavior is changed, but can't be fixed prior that
+      # due to the use of URI#opaque.
+      assert_filename("sqlite3:./file.db?max_pool_size=5", "./file.db")
+    {% end %}
+    assert_filename("sqlite3:/path/to/file.db?max_pool_size=5", "/path/to/file.db")
+    assert_filename("sqlite3://./file.db?max_pool_size=5", "./file.db")
+    assert_filename("sqlite3:///path/to/file.db?max_pool_size=5", "/path/to/file.db")
   end
 
   it "should use database option as file to open" do

spec/pool_spec.cr

@@ -21,7 +21,12 @@ describe DB::Pool do
       fibers.times { channel.receive }
 
       # all numbers were inserted
-      s = fibers * max_n * (max_n + 1) / 2
+      s : Int32
+      {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
+        s = fibers * max_n * (max_n + 1) // 2
+      {% else %}
+        s = fibers * max_n * (max_n + 1) / 2
+      {% end %}
       db.scalar("select sum(n) from numbers").should eq(s)
 
       # numbers were not inserted one fiber at a time

spec/spec_helper.cr

@@ -19,11 +19,13 @@ ensure
   File.delete(DB_FILENAME)
 end
 
-def with_db(name, &block : DB::Database ->)
-  File.delete(name) rescue nil
-  DB.open "sqlite3:#{name}", &block
+def with_db(config, &block : DB::Database ->)
+  uri = "sqlite3:#{config}"
+  filename = SQLite3::Connection.filename(URI.parse(uri))
+  File.delete(filename) rescue nil
+  DB.open uri, &block
 ensure
-  File.delete(name)
+  File.delete(filename) if filename
 end
 
 def with_mem_db(&block : DB::Database ->)

src/sqlite3/connection.cr

@@ -9,11 +9,15 @@ class SQLite3::Connection < DB::Connection
   end
 
   def self.filename(uri : URI)
-    URI.unescape (if path = uri.path
-      (uri.host || "") + path
-    else
-      uri.opaque.not_nil!
-    end)
+    {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
+      URI.unescape((uri.host || "") + uri.path)
+    {% else %}
+      URI.unescape (if path = uri.path
+        (uri.host || "") + path
+      else
+        uri.opaque.not_nil!
+      end)
+    {% end %}
   end
 
   def build_prepared_statement(query)