Establish connections using bookmark ID only (#619)

* Establish connections using bookmark ID only
* Refactor specs
* Extra tests
* Fix homedir assertion for bookmarks path
* Fix newline in the warning message
* Check for bookmark file existence before reading
* Connect code restructure

pkg/command/options.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/jackc/pgpassfile"
 	"github.com/jessevdk/go-flags"
+	"github.com/mitchellh/go-homedir"
 	"github.com/sirupsen/logrus"
 )
 
@@ -154,6 +155,13 @@ func ParseOptions(args []string) (Options, error) {
 		}
 	}
 
+	if opts.BookmarksDir == "" {
+		path, err := homedir.Dir()
+		if err == nil {
+			opts.BookmarksDir = filepath.Join(path, ".pgweb/bookmarks")
+		}
+	}
+
 	return opts, nil
 }