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diff --git a/content/post/cedit-and-paredit.md b/content/post/cedit-and-paredit.md new file mode 100644 index 0000000..23fb1c4 --- /dev/null +++ b/content/post/cedit-and-paredit.md @@ -0,0 +1,44 @@ ++++ +Categories = ["Emacs"] +Description = "Cedit and paredit for structural editing" +Tags = ["development", "emacs"] +title = "Cedit and Paredit" +date = 2014-08-04T07:10:14Z ++++ + +I recently discovered [cedit][], which provides some structural +commands for editing c-like languages. (See this +[Emacs Rocks! episode][e14] if you're not familiar with the concept: +it introduces [paredit][], a structural editing mode for lisps). + +So, it deals with curly braces and semicolons, keeping things balanced +and correct as show in its [screencast][cedit-readme]. It mentions that it +integrates with [paredit][] rather than duplicating *all* its +functionality. After setting up cedit, I decided to try enabling +paredit alongside cedit and disabling autopair. Once I did, +however, I noticed an annoying formatting issue: If I were to type +`foo` and then `(`, paredit would format this as `foo ()`, which makes +sense, considering that paredit is written for lisps — s-expressions +are usually separated by spaces — but not so much for c-like languages. + +I was thinking about disabling paredit and going back to autopair, +when I decided to look through the configuration variables for +paredit. Turns out it provides +`paredit-space-for-delimiter-predicates`, which is a list of functions +that control whether a space should be inserted. So, solving the +formatting issue turned out to be pretty simple: + +```elisp +(defun ap/cedit-space-delimiter-p (endp delimiter) +"Don't insert a space before delimiters in c-style modes" +(not cedit-mode)) +(add-to-list 'paredit-space-for-delimiter-predicates #'ap/cedit-space-delimiter-p) +``` + +Hopefully that saves someone some time if they try to use the two +together. + +[cedit]: https://github.com/zk-phi/cedit +[cedit-readme]: https://github.com/zk-phi/cedit#readme +[e14]: http://emacsrocks.com/e14.html +[paredit]: http://www.emacswiki.org/emacs/ParEdit |