feat(config): fish configs

config/fish/functions/has_app.fish

@@ -0,0 +1,14 @@
+# @halostatue/fish-macos/functions/has_app.fish:v7.0.0
+
+function has_app --description 'Returns true if the named application exists'
+    # Suppress these flags being passed to __macos_app_find
+    argparse a/all q/quiet -- $argv
+    or return 1
+
+    if not set --query argv[1]
+        echo >&2 Usage: (status function) APPNAME...
+        return 1
+    end
+
+    __macos_app_find --exact --quiet $argv
+end