bulkrename using bult-ins instead of using a completely separate program

.config/lf/lfrc

@@ -93,7 +93,26 @@ cmd copyto ${{
 }}
 
 cmd setbg "$1"
-cmd bulkrename $vidir
+
+cmd bulkrename ${{
+    old="$(mktemp)"
+    new="$(mktemp)"
+    [ -z "$fs" ] && fs="$(ls)"
+    printf '%s\n' "$fs" >"$old"
+    printf '%s\n' "$fs" >"$new"
+    $EDITOR "$new"
+    [ "$(wc -l < "$new")" -ne "$(wc -l < "$old")" ] && exit
+    paste "$old" "$new" | while IFS= read -r names; do
+        src="$(printf '%s' "$names" | cut -f1)"
+        dst="$(printf '%s' "$names" | cut -f2)"
+        if [ "$src" = "$dst" ] || [ -e "$dst" ]; then
+            continue
+        fi
+        mv -- "$src" "$dst"
+    done
+    rm -- "$old" "$new"
+    lf -remote "send $id unselect"
+}}
 
 # Bindings
 map <c-f> $lf -remote "send $id select \"$(fzf)\""