+check for Fisherman directories when sourcing its config

config.fish

@@ -1,3 +1,23 @@
+# If fisher_home is not provided, use the directory of this file:
+set -q fisher_home; or set -g fisher_home (dirname (status -f))
+
+# If fisher_config is not provided, set it up:
+set -q fisher_config
+or if test ! -z "$XDG_CONFIG_HOME"
+    set -g fisher_config $XDG_CONFIG_HOME/fisherman
+else
+    # if XDG home is unset or empty, use ~/.config as a fallback
+    set -g fisher_config ~/.config/fisherman
+end
+
+# To not break fish, we need to make sure the config dir exists:
+if test ! -d "$fisher_config"
+    echo "Setting up Fisherman config dir..."
+    mkdir -p "$fisher_config/cache"
+    touch "$fisher_config/fishfile"
+    echo "Done."
+end
+
 set -g fisher_file $fisher_config/fishfile
 set -g fisher_cache $fisher_config/cache
 set -g fisher_binds $fisher_config/key_bindings.fish