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Paredit Preso

Kyle Oba
Kyle Oba

A simple intro to Emacs Paredit minor mode.

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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
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Paredit Preso

  • 1. Bay Area Clojure Meetup functional lispers December 3, 2009 Runa Galactic Headquarters Friday, December 4, 2009
  • 2. paredit At first it sucks, but then it’s awesome. mudphone (kyle oba) irc / twitter / github runa employee 9 Friday, December 4, 2009
  • 3. 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
  • 4. and we’re hiring clojure-hbase-ruby-hadoop-rails-javascript-chefs Friday, December 4, 2009
  • 5. 0/8 why Friday, December 4, 2009
  • 6. Q: What is paredit? A: paredit is a minor mode for Emacs, created by Taylor R. Campbell. Friday, December 4, 2009
  • 7. 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
  • 8. Because, these are your father’s parentheses... http://xkcd.com/297/ Friday, December 4, 2009
  • 9. 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
  • 10. 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
  • 11. 1/8 balancing Friday, December 4, 2009
  • 12. balancing basics keys ([“ ([“”]) Friday, December 4, 2009
  • 13. 1.1/8 assumptions Friday, December 4, 2009
  • 14. 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
  • 15. 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
  • 16. wrapping killing raising splicing slurping / barfing 1.2/8 demo splitting / joining Friday, December 4, 2009
  • 17. 2/8 basic insertion commands Friday, December 4, 2009
  • 18. paredit-open-round keys (a b |c d) ( (a b (|) c d) Friday, December 4, 2009
  • 19. paredit-close-round-and-newline keys (a b |c ) ) (a b c) | Friday, December 4, 2009
  • 20. paredit-close-round keys (a b |c ) M-) (a b c)| Friday, December 4, 2009
  • 21. paredit-open-square keys (a b |c d) [ (a b [|] c) Friday, December 4, 2009
  • 22. paredit-close-square keys (defn cky [bcn| ] 2) ] (defn cky [bcn]| 2) Friday, December 4, 2009
  • 23. paredit-doublequote keys (ça va |bien) “ (ça va “|” bien) Friday, December 4, 2009
  • 24. paredit-doublequote (while in a quote) keys (the “q|uick” fox) “ (the “q”|uick” fox) Friday, December 4, 2009
  • 25. paredit-meta-doublequote keys (the |(cky) bcn) M-” (the “|(cky)” bcn) Friday, December 4, 2009
  • 26. paredit-meta-doublequote (while in quote) keys (the “chk|y” bcn) M-” (the “chky” |bcn) Friday, December 4, 2009
  • 27. paredit-comment-dwim keys (blah |xyz) ; baz M-; (blah xyz) ; |baz Friday, December 4, 2009
  • 28. paredit-comment-dwim keys (amit siva)| M-; (amit siva) ;| Friday, December 4, 2009
  • 29. paredit-comment-dwim (hbase) | keys (clojure) M-; (hbase) ;;; | (clojure) Friday, December 4, 2009
  • 30. paredit-comment-dwim (ruby) |(java) keys M-; (ruby) ;;; | (java) Friday, December 4, 2009
  • 31. paredit-newline keys (let [x 2] |(list x y) C-j (let [x 2] |(list x y)) Friday, December 4, 2009
  • 32. intermission http://xkcd.com/224/ Friday, December 4, 2009
  • 33. 3/8 deleting & killing Friday, December 4, 2009
  • 34. paredit-forward-delete (|”third” worst) keys (“|third” worst) C-d (“|hird” worst) Friday, December 4, 2009
  • 35. paredit-forward-delete (w |(x) y) keys (w (|x) y) C-d (w (|) y) (w | y) Friday, December 4, 2009
  • 36. paredit-backward-delete (“speed” w|alk) keys (“speed” |alk) DEL (“speed”|alk) (“speed|”alk) (“spee|”alk) Friday, December 4, 2009
  • 37. paredit-backward-delete (w (x)| y) keys (w (x|) y) DEL (w (|) y) (w | y) Friday, December 4, 2009
  • 38. paredit-kill keys (zee)| ;comment C-k (zee)| Friday, December 4, 2009
  • 39. paredit-kill (|zee) ;comment keys (|) ;comment C-k (println “|x is:” x) (println “|” x) Friday, December 4, 2009
  • 40. paredit-forward-kill-word |(declare x) ;comment keys (| x) ;comment M-d (|) ;comment () ;| Friday, December 4, 2009
  • 41. paredit-forward-kill-word ;| hack (declare x) keys ;| M-d (declare x) ; (| x) Friday, December 4, 2009
  • 42. paredit-backward-kill-word (declare x) ;comment (zee) | keys (declare x) ;comment M-DEL (|) (declare x) ;| Friday, December 4, 2009
  • 43. paredit-backward-kill-word keys (declare x) ;| M-DEL (declare |) (|) Friday, December 4, 2009
  • 44. 4/8 movement & navigation Friday, December 4, 2009
  • 45. paredit-forward keys (conj |[1 2 3] 4) C-M-f (conj [1 2 3]| 4) Friday, December 4, 2009
  • 46. 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
  • 47. paredit-backward keys (conj [1 2 3]| 4) C-M-b (conj |[1 2 3] 4) Friday, December 4, 2009
  • 48. 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
  • 49. intermission http://www.flickr.com/photos/nickporjr/2158780350/ Friday, December 4, 2009
  • 50. 5/8 depth-changing commands Friday, December 4, 2009
  • 51. paredit-wrap-around keys (eat |cky bcn) M-( (eat (|cky) bcn) same for {}, [], and “” Friday, December 4, 2009
  • 52. paredit-splice-sexp keys (eat (|cky bcn) sdwch) M-s (eat |cky bcn sdwch) Friday, December 4, 2009
  • 53. paredit-splice-sexp-killing-backward keys (eat (cky |bcn)) M-<up> (eat |bcn) Friday, December 4, 2009
  • 54. paredit-splice-sexp-killing-forward keys (eat (cky |bcn)) M-<down> (eat cky|) Friday, December 4, 2009
  • 55. paredit-raise-sexp keys (eat (cky |bcn) sdwch) M-r (eat |bcn sdwch) |bcn Friday, December 4, 2009
  • 56. 6/8 barfage & slurpage Friday, December 4, 2009
  • 57. paredit-forward-slurp-sexp keys (eat (|cky) bcn z) C-) C-<right> (eat (|cky bcn) z) Friday, December 4, 2009
  • 58. paredit-forward-barf-sexp keys (eat (|cky bcn) z) C-} C-<left> (eat (|cky) bcn z) Friday, December 4, 2009
  • 59. paredit-backward-slurp-sexp keys C-( (omg eat (|cky) bcn) C-M-<left> (omg (eat |cky) bcn) Friday, December 4, 2009
  • 60. paredit-backward-barf-sexp keys C-{ (omg (eat |cky) bcn) C-M-<right> (omg eat (|cky) bcn) Friday, December 4, 2009
  • 61. 7/8 miscellaneous commands Friday, December 4, 2009
  • 62. paredit-split-sexp keys (cky |bcn) M-S-s (cky) |(bcn) same for {}, [], and “” Friday, December 4, 2009
  • 63. paredit-join-sexps (cky)| (bcn) (cky| bcn) keys chunky- M-S-j | bacon chunky-|bacon same for {}, [], and “” Friday, December 4, 2009
  • 66. 8/8 in the wild (tips and tricks) Friday, December 4, 2009
  • 67. C-w is not a paredit thing show-paren-mode warning 8.1/8 demo fixing unbalanced parens Friday, December 4, 2009
  • 68. add parens when unbalanced (override matched keys w/ C-q) keys (important | C-q ) (important )| same for {}, [], and “” Friday, December 4, 2009
  • 69. remove pesky spaces (important | ) keys (important C-k then |) <del> (important |) Friday, December 4, 2009
  • 70. remove stray parens with comments poor paren)| keys poor paren|) DEL then ; then poor paren;|) C-d poor paren;| Friday, December 4, 2009
  • 71. override paredit delete keys C-u DEL C-u C-d LTR C-u C-k Friday, December 4, 2009
  • 72. remove stray parens probably the right way keys poor paren)| C-u DEL poor paren| Friday, December 4, 2009
  • 73. dammit, emacs keys M-x butterfly LTR Friday, December 4, 2009
  • 74. M-x butterfly http://xkcd.com/378/ Friday, December 4, 2009
  • 75. 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
  • 76. customize ;;; Customize paredit using `eval-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 `eval-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
  • 78. stole from... ๏ http://mumble.net/~campbell/emacs/paredit.html ๏ http://p.hagelb.org/paredit-screencast.html technomancy - screencast soon? Friday, December 4, 2009
  • 79. 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
  • 80. 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