The Evolution of the Clojure Tooling for Emacs

Slides from my Clojure/conj 2014 talk

Transcript

1. The Evolution of the Clojure tooling for Emacs narrated by Bozhidar I. Batsov
2. Hello!
3. @bbatsov
4. Bug
5. A (Dark) Knight of the Order of Emacs
6. Why I am here?
7. Bulgaria
8. 2013 Other 24% LightTable 8% CCW 8% fireplace 10% Cursive 3% CIDER 48% 2014 Other 13% LightTable 12% CCW 5% fireplace 14% Cursive 14% CIDER 42%
9. –Nancy Pearcey “Competition is always a good thing. It forces us to do our best. A monopoly renders people complacent and satisfied with mediocrity.”
10. The critics
11. CIDER sucks big time!
12. CIDER breaks on every update!
13. CIDER has become bloated and slow!
14. CIDER’s setup is overly complex!
16. CIDER is doing great!
17. Near future Others 10% CIDER 90%
18. Near future Cursive 25% Others 15% CIDER 60%
19. A not so long time ago in a galaxy not far away…
20. Java, PHP and .NET ruled the dev world
21. Lisps were out of fashion
23. A gentleman & a scholar
24. Clojure
25. Biggest Clojure problem at launch?
26. 0 Clojure dev environments
27. Emacs was the last Lisp stronghold
28. SLIME
29. Superior Lisp Interaction Mode for Emacs
30. SLIME Features • REPL • Interactive evaluation • Compilation notes • Code completion • Definition lookup • Documentation lookup • Apropos
31. SLIME Features • Debugger • Value inspector • Tracing • Find usages • Macroexpansion • Scratchpad • Minibuffer code evaluation
32. SLIME (Emacs Lisp) SWANK (Common Lisp) Clozure RPC LispWorks CMUCL ABCL SBCL Client Server Backends
34. clojure-mode & swank-clojure
35. SLIME (Emacs Lisp) SWANK (Common Lisp) swank-clojure
36. A star was born
37. swank-clojure • Requires knowledge of swank (Common Lisp) • Bundles a frozen SLIME version • Subpar features (e.g. debugger, inspector, find usages) • Monolithic (no swank plugins)
38. SLIME is a Common Lisp tool
40. Another esteemed gentleman & scholar
41. nREPL
42. A common foundation for Clojure dev tools
43. • Load (compile) a Clojure file • Evaluate a Clojure form • Interrupt evaluation • Read from the standard input
44. Extensible via middleware
46. nrepl.el
47. nrepl.el (Emacs Lisp) nREPL (Clojure)
48. A workhorse is retired
49. nrepl.el • lacked many SLIME features • relied heavily on evaluation of inlined code • made assumptions about the environment • flawed bencode parser
51. Don’t settle for good. Demand great!
52. –Phil Karlton “There are only two hard things in Computer Science: cache invalidation and naming things.”
54. Clojure Integrated Development Environment & REPL
55. Clojure Interactive Development Environment Reimagined
56. CIDER (Emacs Lisp) nREPL (Clojure) cider-nrepl
57. (defun nrepl-jump-to-def (var) "Jump to the definition of the VAR at point." (let ((form (format "(let [ns-symbol '%s ns-var '%s ns-file (clojure.core/comp :file clojure.core/meta clojure.core/second clojure.core/first clojure.core/ns-publics) resource-str (clojure.core/comp clojure.core/str clojure.java.io/resource ns-file) file-str (clojure.core/comp clojure.core/str clojure.java.io/file ns-file)] (cond ((clojure.core/ns-aliases ns-symbol) ns-var) (let [resolved-ns ((clojure.core/ns-aliases ns-symbol) ns-var)] [(resource-str resolved-ns) (file-str resolved-ns) 1]) (find-ns ns-var) [(resource-str ns-var) (file-str ns-var) 1] (clojure.core/ns-resolve ns-symbol ns-var) ((clojure.core/juxt (clojure.core/comp clojure.core/str clojure.java.io/resource :file) (clojure.core/comp clojure.core/str clojure.java.io/file :file) :line) (clojure.core/meta (clojure.core/ns-resolve ns-symbol ns-var)))))" (nrepl-current-ns) var))) (nrepl-send-string form (nrepl-jump-to-def-handler (current-buffer)) nrepl-buffer-ns (nrepl-current-tooling-session)))) not portable
58. (defun cider-jump-to-var (&optional var line) "Jump to the definition of VAR, optionally at a specific LINE. When called interactively, this operates on point, or falls back to a prompt." (interactive) (cider-ensure-op-supported "info") (cider-read-symbol-name "Symbol: " (lambda (var) (-if-let (info (cider-var-info var)) (cider--jump-to-loc-from-info info) (message "Symbol %s not resolved" var))))) portable
59. CIDER Features • Interactive evaluation • Compilation notes • Code completion • Definition lookup • Documentation lookup • Apropos
60. CIDER Features • Value inspector • Command selector • Tracing • Macroexpansion • Scratchpad • Minibuffer code evalution
61. Bonus features
62. Javadoc support
63. JavaDoc Support
64. C-c C-d d
66. Jump to Java definition
67. JavaDoc Support
68. M-.
70. Jump to resource
72. C-c M-.
73. resources/conj/demo/resource.txt
74. Sanity-preserving stacktraces
78. clojure.test integration
79. C-c ,
82. Namespace Browser
84. Classpath browser
86. Grimoire integration
88. C-c C-d g
90. • nREPL session manager • Smart ns reloading • ClojureScript support
91. Extensions (are easy)
92. • refactoring (clj-refactor + refactor-nrepl) • profiling (cider-profile + nrepl-refactor) • session tracking (cider-spy + cider-spy-nrepl)
93. CIDER tastes better than SLIME
94. What’s still missing?
95. • Debugger • Find usages • A proper manual CIDER 1.0
96. Why CIDER?
97. IDE
99. Emacs
105. Emacs users know how to build productive Lisp workflows
106. • Emacs (ultimate Elisp dev env) • SLIME (and SLY) • Geiser • racket-mode • CIDER (obviously)
107. • paredit • smartparens • rainbow-delimiters • rainbow-identifiers • sexp-fu • paxedit
108. Community impact
109. cider-nrepl https://github.com/clojure-emacs/cider-nrepl
110. refactor-nrepl https://github.com/clojure-emacs/refactor-nrepl
111. compliment https://github.com/alexander-yakushev/compliment
112. cljs-tooling https://github.com/gtrak/cljs-tooling
113. profile https://github.com/thunknyc/profile
114. nREPL improvements
115. Open development
118. 85 contributors!
119. Please, send more help!
120. One more thing…
121. CIDER 0.8 is out!
122. Thanks!
123. CIDER Demo / Q & A Unsession today @ 7 pm
124. Felina