fish: add npm upgrade function

fish/functions/npm_upgrade.fish

@@ -0,0 +1,12 @@
+function npm_upgrade --description "Upgrade npm packages"
+    set --local npm_pkgs_outdated (npm outdated -g --depth=0)
+
+    if test (count $py_pkgs_outdated) = 0
+        echo "All packages up-to-date."
+    else
+        echo "Outdated packages: $npm_pkgs_outdated"
+        if confirm
+            npm update -g
+        end
+    end
+end

fish/functions/pip_upgrade.fish

@@ -4,8 +4,11 @@ function pip_upgrade --description "Upgrade python packages"
     if test (count $py_pkgs_outdated) = 0
         echo "All packages up-to-date."
     else
-        for py_pkg in $py_pkgs_outdated
+        echo "Outdated packages: $py_pkgs_outdated"
-            pip3 install $py_pkg -U
+        if confirm
+            for py_pkg in $py_pkgs_outdated
+                pip3 install -U $py_pkg
+            end
         end
     end
 end