Paredit Preso

Bay Area Clojure Meetup functional lispers December 3, 2009 Runa Galactic Headquarters Friday, December 4, 2009

paredit At ﬁrst it sucks, but then it’s awesome. mudphone (kyle oba) irc / twitter / github runa employee 9 Friday, December 4, 2009

about runa We are simultaneously the largest cloud-based manufacturer, distributor, and consumer of Bavarian-style pretzels, nationally. http://www.ﬂickr.com/photos/bellalago/3938498023/ Friday, December 4, 2009

and we’re hiring clojure-hbase-ruby-hadoop-rails-javascript-chefs Friday, December 4, 2009

0/8 why Friday, December 4, 2009

Q: What is paredit? A: paredit is a minor mode for Emacs, created by Taylor R. Campbell. Friday, December 4, 2009

commit 2ecf00a124062d7b4c4538f79426bc19c6b11b83 Author: Philip (ﬂip) Kromer <ﬂip@infochimps.org> Date: Mon Aug 24 23:38:14 2009 -0500 Paredit fucking sucks my balls So, why paredit? Friday, December 4, 2009

Because, these are your father’s parentheses... http://xkcd.com/297/ Friday, December 4, 2009

http://technomancy.us/126 Hingebjerg – 2009-06-01T14:05:40Z Hi Phil, Just installed the emacs-starter-kit and clojure-mode, and i can't delete curly braces when in clojure-mode. Is there a logical explanation for that? Phil – 2009-06-12T09:37:15Z Hingebjerg: That's a feature of paredit-mode; it enforces that you can't delete parens (or other matched chars) unless they're empty so you don't end up with invalid structure in your code. It's unbelievably handy/ addictive once you get used to it, but if you're not sure what's going on it can be pretty annoying. Friday, December 4, 2009

0/8 why 1/8 balancing 2/8 basic insertion commands 3/8 deleting & killing 4/8 movement & navigation 5/8 depth-changing commands 6/8 barfage & slurpage 7/8 miscellaneous commands 8/8 in the wild (tips & tricks) Friday, December 4, 2009

1/8 balancing Friday, December 4, 2009

balancing basics keys ([“ ([“”]) Friday, December 4, 2009

1.1/8 assumptions Friday, December 4, 2009

you’re using the emacs starter kit or, you’re already familiar setting the modes up you’ve got paredit and show-parens modes M-x paredit-mode M-x show-paren-mode Friday, December 4, 2009

install? ;;; Install paredit by placing `paredit.el' in `/path/to/elisp', a ;;; directory of your choice, and adding to your .emacs ﬁle: ;;; ;;; (add-to-list 'load-path "/path/to/elisp") ;;; (autoload 'paredit-mode "paredit" ;;; "Minor mode for pseudo-structurally editing Lisp code." ;;; t) ;;; ;;; Toggle Paredit Mode with `M-x paredit-mode RET', or enable it ;;; always in a major mode `M' (e.g., `lisp' or `scheme') with: ;;; ;;; (add-hook M-mode-hook (lambda () (paredit-mode +1))) http://mumble.net/~campbell/emacs/paredit.el Friday, December 4, 2009

wrapping killing raising splicing slurping / barﬁng 1.2/8 demo splitting / joining Friday, December 4, 2009

2/8 basic insertion commands Friday, December 4, 2009

paredit-open-round keys (a b |c d) ( (a b (|) c d) Friday, December 4, 2009

paredit-close-round-and-newline keys (a b |c ) ) (a b c) | Friday, December 4, 2009

paredit-close-round keys (a b |c ) M-) (a b c)| Friday, December 4, 2009

paredit-open-square keys (a b |c d) [ (a b [|] c) Friday, December 4, 2009

paredit-close-square keys (defn cky [bcn| ] 2) ] (defn cky [bcn]| 2) Friday, December 4, 2009

paredit-doublequote keys (ça va |bien) “ (ça va “|” bien) Friday, December 4, 2009

paredit-doublequote (while in a quote) keys (the “q|uick” fox) “ (the “q”|uick” fox) Friday, December 4, 2009

paredit-meta-doublequote keys (the |(cky) bcn) M-” (the “|(cky)” bcn) Friday, December 4, 2009

paredit-meta-doublequote (while in quote) keys (the “chk|y” bcn) M-” (the “chky” |bcn) Friday, December 4, 2009

paredit-comment-dwim keys (blah |xyz) ; baz M-; (blah xyz) ; |baz Friday, December 4, 2009

paredit-comment-dwim keys (amit siva)| M-; (amit siva) ;| Friday, December 4, 2009

paredit-comment-dwim (hbase) | keys (clojure) M-; (hbase) ;;; | (clojure) Friday, December 4, 2009

paredit-comment-dwim (ruby) |(java) keys M-; (ruby) ;;; | (java) Friday, December 4, 2009

paredit-newline keys (let [x 2] |(list x y) C-j (let [x 2] |(list x y)) Friday, December 4, 2009

intermission http://xkcd.com/224/ Friday, December 4, 2009

3/8 deleting & killing Friday, December 4, 2009

paredit-forward-delete (|”third” worst) keys (“|third” worst) C-d (“|hird” worst) Friday, December 4, 2009

paredit-forward-delete (w |(x) y) keys (w (|x) y) C-d (w (|) y) (w | y) Friday, December 4, 2009

paredit-backward-delete (w (x)| y) keys (w (x|) y) DEL (w (|) y) (w | y) Friday, December 4, 2009

paredit-kill keys (zee)| ;comment C-k (zee)| Friday, December 4, 2009

paredit-kill (|zee) ;comment keys (|) ;comment C-k (println “|x is:” x) (println “|” x) Friday, December 4, 2009

paredit-forward-kill-word |(declare x) ;comment keys (| x) ;comment M-d (|) ;comment () ;| Friday, December 4, 2009

paredit-forward-kill-word ;| hack (declare x) keys ;| M-d (declare x) ; (| x) Friday, December 4, 2009

paredit-backward-kill-word (declare x) ;comment (zee) | keys (declare x) ;comment M-DEL (|) (declare x) ;| Friday, December 4, 2009

paredit-backward-kill-word keys (declare x) ;| M-DEL (declare |) (|) Friday, December 4, 2009

4/8 movement & navigation Friday, December 4, 2009

paredit-forward keys (conj |[1 2 3] 4) C-M-f (conj [1 2 3]| 4) Friday, December 4, 2009

paredit-forward keys (conj [1 2 3] |4) C-M-f (conj [1 2 3] 4|) (conj [1 2 3] 4)| Friday, December 4, 2009

paredit-backward keys (conj [1 2 3]| 4) C-M-b (conj |[1 2 3] 4) Friday, December 4, 2009

paredit-backward keys (conj| [1 2 3] 4) C-M-b (|conj [1 2 3] 4) |(conj [1 2 3] 4) Friday, December 4, 2009

intermission http://www.ﬂickr.com/photos/nickporjr/2158780350/ Friday, December 4, 2009

5/8 depth-changing commands Friday, December 4, 2009

paredit-wrap-around keys (eat |cky bcn) M-( (eat (|cky) bcn) same for {}, [], and “” Friday, December 4, 2009

paredit-splice-sexp keys (eat (|cky bcn) sdwch) M-s (eat |cky bcn sdwch) Friday, December 4, 2009

paredit-splice-sexp-killing-backward keys (eat (cky |bcn)) M-<up> (eat |bcn) Friday, December 4, 2009

paredit-splice-sexp-killing-forward keys (eat (cky |bcn)) M-<down> (eat cky|) Friday, December 4, 2009

paredit-raise-sexp keys (eat (cky |bcn) sdwch) M-r (eat |bcn sdwch) |bcn Friday, December 4, 2009

6/8 barfage & slurpage Friday, December 4, 2009

paredit-forward-slurp-sexp keys (eat (|cky) bcn z) C-) C-<right> (eat (|cky bcn) z) Friday, December 4, 2009

paredit-forward-barf-sexp keys (eat (|cky bcn) z) C-} C-<left> (eat (|cky) bcn z) Friday, December 4, 2009

paredit-backward-slurp-sexp keys C-( (omg eat (|cky) bcn) C-M-<left> (omg (eat |cky) bcn) Friday, December 4, 2009

paredit-backward-barf-sexp keys C-{ (omg (eat |cky) bcn) C-M-<right> (omg eat (|cky) bcn) Friday, December 4, 2009

7/8 miscellaneous commands Friday, December 4, 2009

paredit-split-sexp keys (cky |bcn) M-S-s (cky) |(bcn) same for {}, [], and “” Friday, December 4, 2009

paredit-join-sexps (cky)| (bcn) (cky| bcn) keys chunky- M-S-j | bacon chunky-|bacon same for {}, [], and “” Friday, December 4, 2009

Friday, December 4, 2009

intermission Friday, December 4, 2009

8/8 in the wild (tips and tricks) Friday, December 4, 2009

C-w is not a paredit thing show-paren-mode warning 8.1/8 demo ﬁxing unbalanced parens Friday, December 4, 2009

add parens when unbalanced (override matched keys w/ C-q) keys (important | C-q ) (important )| same for {}, [], and “” Friday, December 4, 2009

remove pesky spaces (important | ) keys (important C-k then |) <del> (important |) Friday, December 4, 2009

remove stray parens with comments poor paren)| keys poor paren|) DEL then ; then poor paren;|) C-d poor paren;| Friday, December 4, 2009

override paredit delete keys C-u DEL C-u C-d LTR C-u C-k Friday, December 4, 2009

remove stray parens probably the right way keys poor paren)| C-u DEL poor paren| Friday, December 4, 2009

dammit, emacs keys M-x butterﬂy LTR Friday, December 4, 2009

M-x butterﬂy http://xkcd.com/378/ Friday, December 4, 2009

add paredit to the SLIME REPL ;; enable paredit in slime repl (add-hook 'slime-repl-mode-hook (lambda () (paredit-mode +1))) Karol Skocik - http://coding.derkeiler.com/Archive/Lisp/comp.lang.lisp/2007-07/ Friday, December 4, 2009

customize ;;; Customize paredit using èval-after-load': ;;; ;;; (eval-after-load 'paredit ;;; '(progn ...redefine keys, &c....)) ;;; ;;; ... Now `)' is bound to a ;;; command that does not insert a newline, and `M-)' is bound to the ;;; command that inserts a newline. To revert to the former behaviour, ;;; add the following forms to an èval-after-load' form for paredit.el ;;; in your .emacs file: ;;; ;;; (define-key paredit-mode-map (kbd ")") ;;; 'paredit-close-round-and-newline) ;;; (define-key paredit-mode-map (kbd "M-)") ;;; 'paredit-close-round) http://mumble.net/~campbell/emacs/paredit.el Friday, December 4, 2009

http://www.emacswiki.org/emacs/PareditCheatsheet Friday, December 4, 2009

stole from... ๏ http://mumble.net/~campbell/emacs/paredit.html ๏ http://p.hagelb.org/paredit-screencast.html technomancy - screencast soon? Friday, December 4, 2009

consume these... ๏ http://www.emacswiki.org/emacs/ParEdit ๏ http://steve.yegge.googlepages.com/effective-emacs ๏ Peepcode: Meet Emacs ๏ http://peepcode.com/products/meet-emacs ๏ Peepcode: Functional Programming with Clojure ๏ http://peepcode.com/products/functional-programming-with-clojure Friday, December 4, 2009

images and food... ๏ Pretzels - http://www.flickr.com/photos/bellalago/3938498023/ ๏ XKCD “Lisp Cycles” - http://xkcd.com/297/ ๏ XKCD “Lisp” - http://xkcd.com/224/ ๏ XKCD “Real Programmers” - http://xkcd.com/378/ ๏ Obligatory LOLCAT - http://www.flickr.com/photos/nickporjr/2158780350/ ๏ http://www.emacswiki.org/emacs/PareditCheatsheet ๏ thanks to runa, for the food http://bitterfilms.shop.musictoday.com/Product.aspx?pc=8BCT06# Friday, December 4, 2009

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Paredit Preso

by mudphone on Dec 04, 2009

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