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debug-repl's Introduction

The Clojure debug-repl 

Every time I stick a println into some Clojure code to debug it, I
think to myself, "This is Lisp! I should be able to insert a repl
here!"

The problem is of course that Clojure's eval function doesn't know
about the surrounding lexical scope.  How to solve the problem?
Create a macro that passes a copy of the lexical scope in with the
form to be evaled, something like this:

(defn eval-with-locals
  [locals form]
    (eval
     `(let ~(generate-local-bindings locals)
        ~form)))

USE:
The interface is meant to be dead simple:
"(use 'alex-and-georges.debug-repl)" loads it, and "(debug-repl)" invokes it.

That's about it.  When you enter the debug-repl, the regular
repl prompt will be replaced with 

dr =>

An example will make it clearer:

user=>   (let [c 1 d 2]
    (defn a [b c]
      (debug-repl)
      d))
#'user/a

user=>   (a "foo" "bar")

dr-1-1001 => c
"bar"

dr-1-1001 => d
2

dr-1-1001 => *locals*
{fn__104 #<user$eval__103 user$eval__103@5f6303>, c "bar", d 2, fn__106 #<user$eval__103$a__105 user$eval__103$a__105@179dce4>, b "foo", counter__56__auto__ 1001}

dr-1-1001 => (str b c)
"foobar"

dr-1-1001 => ()
2
user=> 

LIMITATIONS:
The debug-repl doesn't currently integrate properly
with the slime-repl, (I think because of how Slime manages IO
redirection,) so you'll have to invoke it from a regular repl, or
slime's *inferior lisp* buffer.

A version of the debug-repl has been ported to slime.  More details
here:
http://hugoduncan.org/post/2010/swank_clojure_gets_a_break_with_the_local_environment.xhtml

debug-repl's People

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debug-repl's Issues

(quit-dr) throw an error

(quit-dr)
;;=> Exception$Enumeration$f482e887 vendors.debug_repl.proxy$java.lang.Exception$Enumeration$f482e887.fillInStackTrace (:-1)

dr-1-1001 => (.printStackTrace *e)

;;=> vendors.debug_repl.proxy$java.lang.Exception$Enumeration$f482e887
at vendors.debug_repl.proxy$java.lang.Exception$Enumeration$f482e887.fillInStackTrace(Unknown Source)
at java.lang.Throwable.(Throwable.java:181)
at java.lang.Exception.(Exception.java:29)
at vendors.debug_repl.proxy$java.lang.Exception$Enumeration$f482e887.(Unknown Source)
at vendors.debug_repl$fn__16719.invoke(debug_repl.clj:86)
at clojure.lang.AFn.applyToHelper(AFn.java:152)
at clojure.lang.AFn.applyTo(AFn.java:144)
at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:3509)
at clojure.lang.Compiler$DefExpr.eval(Compiler.java:417)
at clojure.lang.Compiler.eval(Compiler.java:6647)
at clojure.lang.Compiler.load(Compiler.java:7069)
at clojure.lang.RT.loadResourceScript(RT.java:370)
at clojure.lang.RT.loadResourceScript(RT.java:361)
at clojure.lang.RT.load(RT.java:440)
at clojure.lang.RT.load(RT.java:411)
at clojure.core$load$fn__5027.invoke(core.clj:5561)
at clojure.core$load.doInvoke(core.clj:5560)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at clojure.core$load_one.invoke(core.clj:5366)
at clojure.core$load_lib$fn__4976.invoke(core.clj:5406)
at clojure.core$load_lib.doInvoke(core.clj:5405)
at clojure.lang.RestFn.applyTo(RestFn.java:142)
at clojure.core$apply.invoke(core.clj:619)
at clojure.core$load_libs.doInvoke(core.clj:5444)
at clojure.lang.RestFn.applyTo(RestFn.java:137)
at clojure.core$apply.invoke(core.clj:621)
at clojure.core$use.doInvoke(core.clj:5538)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at utils.utils$eval16693.invoke(form-init1922168186769041658.clj:12)
at clojure.lang.Compiler.eval(Compiler.java:6642)
at clojure.lang.Compiler.eval(Compiler.java:6605)
at clojure.core$eval.invoke(core.clj:2883)
at clojure.main$repl$read_eval_print__6581$fn__6584.invoke(main.clj:239)
at clojure.main$repl$read_eval_print__6581.invoke(main.clj:239)
at clojure.main$repl$fn__6590.invoke(main.clj:257)
at clojure.main$repl.doInvoke(main.clj:257)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.main$repl_opt.invoke(main.clj:323)
at clojure.main$main.doInvoke(main.clj:421)
at clojure.lang.RestFn.invoke(RestFn.java:397)
at clojure.lang.Var.invoke(Var.java:383)
at clojure.lang.AFn.applyToHelper(AFn.java:152)
at clojure.lang.Var.applyTo(Var.java:708)
at clojure.main.main(main.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)
at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:207)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)
at clojure.lang.Reflector.invokeStaticMethod(Reflector.java:207)
at user$eval1015.invoke(form-init1922168186769041658.clj:1)
at clojure.lang.Compiler.eval(Compiler.java:6642)
at clojure.lang.Compiler.eval(Compiler.java:6632)
at clojure.lang.Compiler.load(Compiler.java:7069)
at clojure.lang.Compiler.loadFile(Compiler.java:7025)
at clojure.main$load_script.invoke(main.clj:274)
at clojure.main$init_opt.invoke(main.clj:279)
at clojure.main$initialize.invoke(main.clj:307)
at clojure.main$null_opt.invoke(main.clj:342)
at clojure.main$main.doInvoke(main.clj:420)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at clojure.lang.Var.invoke(Var.java:391)
at clojure.lang.AFn.applyToHelper(AFn.java:156)
at clojure.lang.Var.applyTo(Var.java:708)
at clojure.main.main(main.java:37)
nil

Clojure 1.3.0 Support

Clojure 1.3.0 complains about rebinding things like locals. It don't like that no more.

Push to clojars please.

java.lang.IllegalStateException: Can't dynamically bind non-dynamic var: alex-and-georges.debug-repl/level

is annoying.

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