lisp

I am manually constructing path strings in Elisp by concatenating partial paths and directory names. Unfortunately sometimes the paths end with slash, sometimes not. Therefore, I need to insert slash before concatenating a directory name when necessary but not otherwise. What's a good way to do this? (file-name-as-directory dir) will return directory path dir with a trailing slash, adding one if necessary, and not otherwise. If you had your sequence of partial paths in a list, you could do something like: (let ((directory-list '("/foo" "bar/" "p/q/" "x/y")) (file-name "some_file.el")) (concat

I have been a programmer for a decade now, but I believe this is the first time I've ever asked a question on a forum. I just can't figure this out and can't find the answer already online. I am trying to turn on CUA mode so that emacs is more bearable for a windows user (normal copy paste functions). I am running Windows 7 and installed emacs through the Lisp In A Box package. I understand that I need to add a line to my .emacs file or init.el file. I'm not sure which, but I can't find either in my Lip In A Box install directory. The emacs package install also did not come with any tutorials

As a lot of people pointed out in this question , Lisp is mostly used as a learning experience. Nevertheless, it would be great if I could somehow use my Lisp algorithms and combine them with my C# programs. In college my profs never could tell me how to use my Lisp routines in a program (no, not writing a GUI in Lisp, thank you). So how can I? jfs Try these .Net implementations of Lisp: IronScheme IronScheme will aim to be a R6RS conforming Scheme implementation based on the Microsoft DLR. L Sharp .NET L Sharp .NET is a powerful Lisp-like scripting language for .NET. It uses a Lisp dialect

I'm having trouble reading output from dr racket. By default it displays lists using mcons. For example, sicp exercise 2.32 produces: > (subsets (list 1 2 3)) (mcons (mcons '() (mcons (mcons 3 '()) (mcons (mcons 2 '()) (mcons (mcons 2 (mcons 3 '())) (mcons (mcons 1 '()) (mcons (mcons 1 (mcons 3 '())) (mcons (mcons 1 (mcons 2 '())) (mcons (mcons 1 (mcons 2 (mcons 3 '()))) '())))))))) '()) I'm having trouble reading this. Is there a way to make the output look like: (() (3) (2) (2 3) (1) (1 3) (1 2) (1 2 3)) Thanks! Do you know what language are you using in your #lang line? The rest of the

Given a list, how would I select a new list, containing a slice of the original list (Given offset and number of elements) ? EDIT: Good suggestions so far. Isn't there something specified in one of the SRFI's? This appears to be a very fundamental thing, so I'm surprised that I need to implement it in user-land. The following code will do what you want: (define get-n-items (lambda (lst num) (if (> num 0) (cons (car lst) (get-n-items (cdr lst) (- num 1))) '()))) ;' (define slice (lambda (lst start count) (if (> start 1) (slice (cdr lst) (- start 1) count) (get-n-items lst count)))) Example: >