Install the zoxide plugin

functions/zoxide.fish

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+function _zoxide_z_complete -d "Complete directory first or zoxide queries otherwise" --argument-names comp desc
+    # most of this functions is compied from __fish_complete_directories with a small tweak
+
+    # comp is the currently completing token
+    if not set -q comp[1]
+        set comp (commandline -ct)
+    end
+    # cmd are all tokens including the current one except the command
+    set -l cmd (commandline -opc) $comp
+    set -e cmd[1]
+
+    if test "$comp" = "$cmd"
+        # if we are on our first token, then allow file complete
+        # otherwise use zoxide (for multi word zoxide query)
+
+        # HACK: We call into the file completions by using a non-existent command.
+        # If we used e.g. `ls`, we'd run the risk of completing its options or another kind of argument.
+        # But since we default to file completions, if something doesn't have another completion...
+        set -f dirs (complete -C"nonexistentcommandooheehoohaahaahdingdongwallawallabingbang $comp" | string match -r '.*/$')
+    end
+
+    # in the future: replace entire cmd with tab complete instead of only last token
+    # at the moment: is handled in z function to always enter last token if directory
+
+    if set -q dirs[1]
+        # if we find any files to complete use those
+        printf "%s\t$desc\n" $dirs
+    else
+        # otherwise use zoxide
+        zoxide query -l $cmd
+    end
+end
+
+function _zoxide_equals_first_token -a check -d "Test if first non-switch token equals given one"
+    set -l tokens (commandline -co)
+    set -e tokens[1]
+    set -l tokens (string replace -r --filter '^([^-].*)' '$1' -- $tokens)
+    if set -q tokens[1]
+        test $tokens[1] = $check
+    else
+        return 1
+    end
+end