Debugging in Clojure: Finding Light in the Darkness using Emacs and Cursive
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This document summarizes an error encountered when trying to alter the name of a protocol, as well as configuration files and examples demonstrating usage of the Spyscope library for Clojure debugging and tracing.
![~/.lein/profiles.clj
{:user {:repl-options {:init (set! *print-length* 150)}
:dependencies [[spyscope "0.1.5"]]
:injections [(require 'spyscope.core)]}
:dev {:dependencies [[proto-repl "0.3.1"]
[proto-repl-charts "0.3.1"]
[alembic "0.3.2"]]}}](https://image.slidesharecdn.com/debugging-in-clojure-171109023824/85/Debugging-in-Clojure-Finding-Light-in-the-Darkness-using-Emacs-and-Cursive-7-320.jpg)
![#spy/d - debug output
(defn foo
"I don't do a whole lot."
[x]
(println #spy/d x "Hello, World!"))
spyscope.core$pretty_render_value.invokeStatic(core.clj:24) x => 10
10 Hello, World!](https://image.slidesharecdn.com/debugging-in-clojure-171109023824/85/Debugging-in-Clojure-Finding-Light-in-the-Darkness-using-Emacs-and-Cursive-9-320.jpg)
![#spy/t - trace-query
(defn call-future [p] (future (Thread/sleep 10000)
#spy/t (+ 4
(:value {:value p
:something "else"}))))
user=>(use `spyscope.repl)
nil
user=>(trace-query)
spyscope.core$pretty_render_value.invokeStatic(core.clj:24) (+ (:value {:value p, :something "else"})) => 100
----------------------------------------
spyscope.core$pretty_render_value.invokeStatic(core.clj:24) (+ (:value {:value p, :something "else"})) => 100
----------------------------------------
spyscope.core$pretty_render_value.invokeStatic(core.clj:24) (+ 4 (:value {:value p, :something "else"})) => 1
nil](https://image.slidesharecdn.com/debugging-in-clojure-171109023824/85/Debugging-in-Clojure-Finding-Light-in-the-Darkness-using-Emacs-and-Cursive-10-320.jpg)
![(defn do-stuff [x y z]
(let [file (slurp "./README.md")
hello (take 10 file)]
#dbg ^{:break/when (some? file)}
(+ 10 (count hello))))](https://image.slidesharecdn.com/debugging-in-clojure-171109023824/85/Debugging-in-Clojure-Finding-Light-in-the-Darkness-using-Emacs-and-Cursive-12-320.jpg)
