fish: standardize config structure

config/shell/.config/fish/conf.d/10-sshs.fish

@@ -0,0 +1,14 @@
+# ssh with encrypted private keys
+# $ssh_keys should be set in advance or left empty to use the default keys
+if type -q ssh
+    bass $(ssh-init) > /dev/null 2>&1
+
+    # avoid entering passphrase every time
+    function sshs
+        # test if keys are added to ssh-agent
+        if not ssh-add -l > /dev/null 2>&1
+            ssh-add $ssh_keys
+        end
+        ssh $argv
+    end
+end