Discovering the Clojure language is more effective when you have good tool support. I cover the setup of a really great (perfect?) clojure development environment using Emacs 24 Clojure mode Marmalade repository Leiningen build tool Autocomplete manual installation Lightbox, the future of Clojure IDE's ? Thank you.

1. ( P e rfe c t?
E n v ir o n m e
nt)
C – means control key, M – means meta key

2. ClojureMadeSimple.co.uk
Information covered in this presentation is also detailed on my website
C – means control key, M – means meta key

3. slideshare.net/jr0cket
This slide deck is available to follow along with on slideshare.net
C – means control key, M – means meta key

4. Something simple
to start with
C – means control key, M – means meta key

5. C – means control key, M – means meta key

6. A taste of things
to come
C – means control key, M – means meta key

7. C – means control key, M – means meta key

8. Get Emacs
(sorry vi people)
C – means control key, M – means meta key

9. Download & Install Emacs
Linux
sudo apt-add-repository
ppa:cassou/emacs
sudo apt-get update
sudo apt-get install emacs-snapshot
Mac Windows
EmacsForMacOSX.com Use Cygwin?
C – means control key, M – means meta key

10. In the meantime: Usual Suspects
Netbeans
IntelliJ
Eclipse
C – means control key, M – means meta key

11. Configure emacs
… you will have an .el of a time
C – means control key, M – means meta key

12. Configs live in ~/.emacs.d folder
~/.emacs.d
folder created when Emacs first run
~/.emacs.d/init.el
main configuration file for Emacs
You can define multiple .el config files as long as they are on the
Emacs load path. init.el is the read first.
C – means control key, M – means meta key

13. Give Emacs a
Clojure injection
… lots of starter-kits, only one for Clojure
C – means control key, M – means meta key

14. Automatic Clojure install
… get your Clojure fix quickly
C – means control key, M – means meta key

15. Add the package repository
;; Add Marmalade package archive for Emacs starter kit
;; and tonnes of other packages to your .emacs.d/init.el
(require 'package)
(add-to-list
'package-archives
'("marmalade" .
"http://marmalade-
repo.org/packages/"))
C – means control key, M – means meta key

16. Specify package to load
(when (not package-archive-contents)
(package-refresh-contents))
(defvar my-packages '(starter-kit
starter-kit-lisp
starter-kit-
eshell
starter-kit-
bindings
clojure-mode
clojure-test-mode M – means meta key
C – means control key,

17. Didn't get all that typed??
Clone my Emacs Clojure Kickstart repository on
github.com/jr0cket
git clone
https://jr0cket@github.com/
jr0cket/Emacs-clojure-
kickstart.git
~/.emacs.d
The git clone command should all be on one line, but would not be as readable on the slide
C – means control key, M – means meta key

18. Re-start Emacs
… watch clojure and other goodies be
automatically downloaded and added.
C – means control key, M – means meta key

19. In the meantime, Clooj
Clojure IDE in Clojure
github.com/arthuredelstein/clooj
C – means control key, M – means meta key

20. github.com/arthuredelstein/clooj
C – means control key, M – means meta key

21. Back to Emacs
… keyboard on stun !!
C – means control key, M – means meta key

22. Editing text...
...should be easy, right?
C – means control key, M – means meta key

23. Using a mouse is bad for your
health
C – means control key, M – means meta key

24. C – means control key, M – means meta key

25. Moving along a line
C – a
Go to start of a line
C – e
Go to end of a line
C – means control key, M – means meta key

26. Searching for something...
C – s
Search forward
C – r
Search backwards
C – means control key, M – means meta key

27. Select / Copy / Paste
C – @
Or to select, use the mouse, Luke
C – means control key, M – means meta key

28. Select / Copy / Paste
C – k
cut line
C – w
cut selected
C – means control key, M – means meta key

29. Select / Copy / Paste
C – y
Yank that text into your code
C – means control key, M – means meta key

30. Undo / Redo
C - _
Go back change by change
C – means control key, M – means meta key

31. Undo / Redo
C - ???
Go forward change by change
C – means control key, M – means meta key

32. Some core keyboard
commands
C – means control key, M – means meta key

33. C – g
Hit as many times as necessary to
cancel a keyboard command
C – means control key, M – means meta key

34. Getting help with
keyboard commands
C – means control key, M – means meta key

35. Just the bindings,
ma'am
C – h b
List all the current keyboard bindings configured
in Emacs
C – means control key, M – means meta key

36. Just the modes,
ma'am
C – h m
Modes can be either major or minor and many
can be used together.
C – means control key, M – means meta key

37. Function keys Help
F1 – b
F1 – m
F1 function key is the same as help C - h
C – means control key, M – means meta key

38. Funky stuff
C – means control key, M – means meta key

39. Transpose characters
C – t
Swap the current character with the previous one
- good for erratic typing
C – means control key, M – means meta key

40. Coding Demo? – Super-size it!
C – +
C – -
Make your text big for the people at the back of
the room
C – means control key, M – means meta key

41. Clojure project
management
C – means control key, M – means meta key

42. Leiningen
… more fun than maven
C – means control key, M – means meta key

43. le in in g e n
Leiningen
.o rg
lein new Create a new clojure project
lein deps Download all dependencies
lein repl Start the interactive shell (repl)
lein jack-in Start repl server
C – means control key, M – means meta key

44. Create a new project
lein new my-project
cd my-project
lein deps
C – means control key, M – means meta key

45. Open project in emacs
cd my-project
emacs project.clj
C – means control key, M – means meta key

46. Default project definition
C – means control key, M – means meta key

47. Add a REPL server
C – means control key, M – means meta key

48. Dev Dependencies
Add libraries only needed for development
Not packaged when deployed
C – means control key, M – means meta key

49. C – means control key, M – means meta key

50. Clojure project
management
in Emacs
C – means control key, M – means meta key

51. Find file in project
C – c f
Select one of the files available in the current
Clojure project
- the file doesnt have to be open in Emacs
C – means control key, M – means meta key

52. Fire up the REPL
M – x
clojure-
jack-in
C – means control key, M – means meta key

53. Define your own Global short-cut
Open your .emacs.d/init.el file and add:
(global-set-key
(kbd "C-c C-j") 'clojure-jack-
in)
In Emacs, start the REPL with
C – c C – j
C – means control key, M – means meta key

54. More Cool short-cuts
later
… but its easy, right!
C – means control key, M – means meta key

55. Navigating functions
(s-expressions)
C – means control key, M – means meta key

56. Jump around in functions
C – M – f
C – M – b
C – M – u
C – means control key, M – means meta key

57. Jump between function
definitions
C – M – Home
C – M – End
Skip through your code function by function
C – means control key, M – means meta key

58. Jump between function
definitions
C – M – a
C – M – e
Jump to the start or end of a function definintion
C – means control key, M – means meta key

59. Keep balanced,
use
ParEdit
C – means control key, M – means meta key

60. ParEdit matches ( [ { ' ”
Prevents unbalanced parents and quotes
Example
Cant delete either parens that surround characters
(fubar) without first deleting all the characters
Pull code into brackets
Reorganise code around brackets
C – means control key, M – means meta key

61. Pull code in
M – )
Pull the next block of code inside
C – means control key, M – means meta key

62. Push code in
M – (
Push the next block of code outside ??????
C – means control key, M – means meta key

63. Clojure related commands
C-c TAB: Autocomplete symbol at point
C-x C-e: Eval the form under the point
C-c C-k: Compile the current buffer
C-c C-l: Load current buffer and force
dependent namespaces to reload
M-.: Jump to the definition of a var
C-c S-i: Inspect a value
C-c C-m: Macroexpand the call under the point
C – means control key, M – means meta key

64. Auto-complete
C – means control key, M – means meta key

65. The easy way
Clone Sam Aarons Live Coding repository
github.com/overtone/emacs-live
C – means control key, M – means meta key

66. The manual way
Add the auto-complete package dependencies to
~/.emacs.d/init.el
popup
Download the Git repository
https://github.com/m2ym/auto-complete
M – x load-file
autocomplete/etc/install.el
C – means control key, M – means meta key

67. Other cool stuff to help
you discover Clojure
C – means control key, M – means meta key

68. ClojureAtlas.com
C – means control key, M – means meta key

69. Light Table (On Kickstarter)
C – means control key, M – means meta key

70. Th a n k yo u
London Cl oj ur i ans
@ r 0c ket
j
Cl oj ur eMadeSi m e. c o
pl
. uk
C – means control key, M – means meta key