install: add qt

install/util.fish

@@ -116,3 +116,13 @@ function install-link -a from to
         ln -s $from $to
     end
 end
+
+function confirm-copy -a from to
+    test -L $to -a "$(realpath $to 2> /dev/null)" = (realpath $from) && return  # Return if symlink
+    cmp $from $to &> /dev/null && return  # Return if files are the same
+    if test -e $to
+        read -l -p "input '$(realpath $to) already exists. Overwrite? [y/N] ' -n" confirm
+        test "$confirm" = 'y' -o "$confirm" = 'Y' && log 'Continuing.' || return
+    end
+    cp $from $to
+end