I'd like to run my Emacs in daemon mode, and then use emacsclient to actually display things. However, if I run emacsclient filename, it shows up in the terminal, which isn't what I want; I instead have to pass it the -c option.
However, that option always creates a new frame, which isn't what I want - I'd rather just have one frame, and have stuff open in a new buffer in the same frame if it already exists; otherwise, it should make me a new frame. However, I'm not sure how to do this.
Additionally, I want that one frame to be maximized, which I usually achieve my starting Emacs with the -mm option; how would I ensure that a frame made by emacsclient is also maximized?
For having every new frame maximized, you could add this to your .emacs:
(modify-all-frames-parameters '((fullscreen . maximized))))