fix(aur): fall back to yay when paru is unavailable

upgrade, pkg, search, and parur now detect paru first, then yay, and
print a clear error if neither is installed. Removes the hard dependency
on paru specifically across all AUR-wrapper functions.

functions/parur.fish

@@ -3,16 +3,23 @@
 
 # Interactively search and remove an installed package using fzf
 function parur --description 'Interactively search and remove an installed package using fzf'
-    # 1. Use command substitution to get the package list from fzf
+    set -l aur ""
+    if type -q paru
+        set aur paru
+    else if type -q yay
+        set aur yay
+    else
+        echo "No AUR helper found (install paru or yay)" >&2
+        return 1
+    end
+
     set -l pkg_list (
         pacman -Qqs \
         | fzf --preview 'pacman -Qi {}' --multi
     )
 
-    # 2. Check if a package was selected.
     if test (count $pkg_list) -gt 0
-        # 3. Pass the selected packages directly to paru -R
-        paru -R $pkg_list
+        $aur -R $pkg_list
     else
         echo "No packages selected for removal."
     end

functions/pkg.fish

@@ -1,10 +1,15 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# Function for installing packages with paru.
-# This runs `paru` with the `-S` flag to install one or more packages.
-# The `$argv` variable passes all arguments given to the `pkg` function
-# directly to the `paru` command.
-function pkg --wraps='paru' --description 'directly to the `paru` command.'
-    paru -S $argv
+function pkg --description 'Install packages via paru or yay'
+    set -l aur ""
+    if type -q paru
+        set aur paru
+    else if type -q yay
+        set aur yay
+    else
+        echo "No AUR helper found (install paru or yay)" >&2
+        return 1
+    end
+    $aur -S $argv
 end

functions/search.fish

@@ -1,10 +1,15 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# Function for searching for packages to install with paru.
-# This runs `paru` with the search flags.
-# The `$argv` variable passes all arguments given to the `search` function
-# directly to the `paru` command.
-function search --wraps='paru' --description 'directly to the `paru` command.'
-    paru $argv
+function search --description 'Search/install packages interactively via paru or yay'
+    set -l aur ""
+    if type -q paru
+        set aur paru
+    else if type -q yay
+        set aur yay
+    else
+        echo "No AUR helper found (install paru or yay)" >&2
+        return 1
+    end
+    $aur $argv
 end

functions/upgrade.fish

@@ -1,9 +1,15 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# Function for upgrading the system with paru.
-# This runs `paru` with the `-Syu` flags to sync, refresh, and upgrade all
-# packages, and adds `--no-confirm` to bypass the confirmation prompt.
-function upgrade --wraps='paru' --description 'packages, and adds `--no-confirm` to bypass the confirmation prompt.'
-    paru -Syu --noconfirm
+function upgrade --description 'Full system upgrade via paru or yay'
+    set -l aur ""
+    if type -q paru
+        set aur paru
+    else if type -q yay
+        set aur yay
+    else
+        echo "No AUR helper found (install paru or yay)" >&2
+        return 1
+    end
+    $aur -Syu --noconfirm
 end