is it possible to let helm complete the current file name in helm-dired-do-rename? It is not convenient if I need to type in a long name only to change a part of it. Thank you for your help!
You can navigate to that file, execute persistent actdion (default is
C-z) to complete it, then start modifying.
Actually this is documented in the helm wiki:
To yank the symbol at point from helm-current-buffer (i.e. buffer where a helm command originated):
Alternatively, customize helm-yank-symbol-first to enable
to always yank the whole symbol on first invocation.