feat: Add new gcloud commands, API clients, and third-party libraries across various services.

gcloud auth application-default login/google-cloud-sdk/path.fish.inc

@@ -0,0 +1,26 @@
+#!/bin/fish
+# The begin/end block limits the scope of all variables except $PATH
+begin
+  # This script aims to be a direct mapping of our path.bash.inc shell, rather
+  # than idiomatic fish. Why? I don't really understand fish.
+  set script_link (readlink (status -f)); or set script_link (status -f)
+  # This sed expression is the equivalent of "${script_link%/*}" in bash, which
+  # chops off "/*" (with * as a wildcard) from the end of script_link.
+  set apparent_sdk_dir (echo $script_link | sed 's/\(.*\)\/.*/\1/')
+  if [ "$apparent_sdk_dir" = "$script_link" ]
+    set apparent_sdk_dir .
+  end
+  set old_dir (pwd)
+  # No "cd -P" in fish. It always resolves symlinks to their canonical location,
+  # though, when you "cd" in.
+  # Also, cd is  cd is *both* a shell builtin and shell wrapper function (to
+  # implement "cd -") in fish, so "command cd" won't work. "builtin cd" will.
+  set sdk_dir (builtin cd "$apparent_sdk_dir" > /dev/null; and pwd)
+  builtin cd "$old_dir"
+  set bin_path "$sdk_dir/bin"
+  # -gx for global (not limited to this begin/end block) and exportable (part of
+  # the environment for child processes)
+  if not contains "$bin_path" $PATH
+    set -gx PATH "$bin_path" $PATH
+  end
+end