3/28/2023 0 Comments Copy and paste in emacs![]() ![]() ![]() So the “script” above should probably detect if there’s no display, and in that case revert to regular emacs behaviour. You should be able to verify this on the command line on the remote machine: xsel should not work at all without -X: It’s like logging in to a completely non-graphical environment - it’s just a terminal - there’s no “global clipboard” that can be used to copy and paste from. Without ssh -X (using just plain ssh) the code above is pointless. Putting it another way: this trick requires a graphical environment - an X-server (or a Windows equivalent - see the comment from Mohamad Alrawashdeh) - whose “clipboard” we use to copy to and from, with the help from the xsel program (or putclip/getclip). If you log in on a remote machine using ssh you’ll have to use ssh -X for this whole thing to work, so that the remote shell you’re using (specifically the xsel program) has “access” to the X-server on your local machine. I guess you’ve found a limitation in the code above. Thanks to Nikolaj Schumacher and Miles Bader on the help-gnu-emacs mailing list for helping out.Īah. ( let (( xsel-output ( shell-command-to-string "xsel -clipboard -output" ))) ( unless ( string= ( car kill-ring ) xsel-output ) xsel-output ))) Attach callbacks to hooks ( setq interprogram-cut-function 'xsel-cut-function ) ( setq interprogram-paste-function 'xsel-paste-function ) Idea from ) ) Else, nil is returned, so whatever is in the top of the kill-ring will be used. If it is different from the top of the kill-ring (car kill-ring), then return it. Instead, we use of xsel, see - "a command-line program for getting and setting the contents of the X selection" ( unless window-system (when (getenv "DISPLAY") Callback for when user cuts ( defun xsel-cut-function ( text &optional push ) Insert text to temp-buffer, and "send" content to xsel stdin ( with-temp-buffer ( insert text ) I prefer using the "clipboard" selection (the one the typically is used by c-c/c-v) before the primary selection (that uses mouse-select/middle-button-click) ( call-process-region ( point-min ) ( point-max ) "xsel" nil 0 nil "-clipboard" "-input" ))) Call back for when user pastes ( defun xsel-paste-function () Find out what is current selection by xsel. I prefer using the "clipboard" selection (the one the typically is used by c-c/c-v) before the primary selection (that uses mouse-select/middle-button-click) ( setq x-select-enable-clipboard t ) If emacs is run in a terminal, the clipboard- functions have no effect. Otherwise it adds the movie to the database and returns the array. Also, if the movie title is already in the database, it returns NIL. ![]() What you are asked Change function ADD-MOVIE so that it returns NIL if the database is already full. Preamble Function ADD-MOVIE above adds a movie to the ∗ db ∗ and returns ∗ db ∗. NOTE: you should not change the definition of the structure MOVIE provided above when solving these exercises. To copy-paste text to a window buffer in emacs on Portacle: use the cursor to highlight the text, then click on the location you would like to paste the text, and press C − y (defstruct movie title director year type) (defparameter *size* 3 ) (defvar *db*) (setf *db* (make-array *size* :initial-element nil)) (defun add-movie (m) "Adds a movie to *db* and returns *db** (dotimes (i *size*) (when (null (aref *db* i)) (setf (aref *db* i) m) (return *db*))) (defun in-db? (title) "Returns ∗ db* if movie title is in the database otherwise returns NIL" (dotimes (i *size*) (when (and (typep (aref *db* i) 'movie) (requal (movie-title (aref *db* i)) title)) In the exercises below, you will be asked to change function ADD-MOVIE and add other functions to this program. On Portacle, type C-x C-f to create a new file solution.lisp in your Lab03/ folder, and copy-paste the program below in your solution.lisp. ![]()
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