Clojure JIRA

[CLJ-848] defn :or form does not warn you if you provide a vector instead of a map

Tue, 25 Oct 2011 18:04:23 -0500

I had a problem defining a function today, I passed :or a vector instead of a map - everything seemed to work fine but later on I got a really puzzling "Null pointer exception".

raek helped me debug the problem and suggested opening this ticket. I think it would be useful if an exception was thrown on the :or line unless it's given a map.

Here are some examples

(defn broken-example [{:keys [i processor]
:or [processor identity]}]
(processor i))

(defn working-example [{:keys [i processor]
:or {processor identity}}]
(processor i))

(working-example {:i 1})
=> 1
(broken-example {:i 1})
=> Null pointer exception

Cheers, Dave.

[CLJ-765] Enhance clojure.java.shell/sh to accept more input types

Fri, 6 May 2011 08:49:09 -0500

Currently clojure.java.shell/sh will only accept bytes or Strings as inputs to the subprocess's stdin.

Attached patch replaces code specific to byte[] and String with a call to clojure.java.io/copy, thus additionally accepting InputStreams, Readers, and Files as input.

[CLJ-753] clojure.string/replace-first returns nil with replacement fn when regex doesn't match

Fri, 1 Mar 2013 12:47:01 -0600

Originally reported by Takahiro Hozumi

With a function as the "replacement" argument, clojure.string/replace-first returns nil if there is no match, instead of returning the original string unchanged.

user=> (use 'clojure.string)
nil
user=> (replace-first "abcdef" "ghi" "jkl")
"abcdef"
user=> (replace-first "abcdef" #"ghi" "jkl")
"abcdef"
user=> (replace-first "abcdef" #"ghi" (fn [a] "jkl"))
nil

[CLJ-733] Data Conveying Exception

Fri, 9 Dec 2011 10:01:00 -0600

Problem: need to convey diagnostic information in an exception, and Java exceptions are poor for this because they don't have any place to put data. Having many apps write their own exceptions is unnecessary code bloat, and sometimes has compilation implications.

Choices made:

Naming it ExceptionInfo. Needs to tell the user that it carries data, without suggesting that there was a problem with data.
- think we have to include Exception in the name, esp. for interop consumers.
Class of data member. IPersistentMap
Class of map input. IPersistentMap
Do not want to build anything to support conditional logic. (Use bindings for this).
Base class. RuntimeException is consistent with a dynamic language (don't want to impose checked exceptions).
print with data just after msg on first line
equality by identity (pretty much dictated by having exception as base class)
ex-info factory function
ex-data fn to get the data out
data and msg arguments required
data argument comes second
- matches Java expectation of msg first, cause last
- matches print order

[CLJ-730] Create test suite for functional fns (e.g. juxt, comp, partial, etc.)

Fri, 18 May 2012 12:31:51 -0500

The tests in other_functions.clj for the combinator functions are tenuous in some cases (comp) and missing in others (juxt, partial, complement, and constantly). It would be nice to have a full suite of combinator tests moving forward.

I would be happy to write the needed tests.

[CLJ-371] dynamic defrecord definitions trumped by AOT versions in classpath

Fri, 2 Dec 2011 13:39:40 -0600

Symptom: Define a defrecord at the repl and you still see the old (AOT'd) defrecord.

In the attached project:
lein compile
lein repl

and enter the commands in the comment in src/defrecordissue/core.clj

Design Discussion here: http://dev.clojure.org/display/design/Dynamic+defrecord+definitions+trumped+by+AOT+versions+in+classpath

[CLJ-342] Enhance (vector-of) to populate vector

Sun, 20 Mar 2011 08:46:37 -0500

As discussed on clojure-dev at <http://groups.google.com/group/clojure-dev/browse_thread/thread/97137884bb33f8ee>, I would like to enhance (vector-of) so that it can create a populated vector. There are two ways to do this:

1. Like vector, take an arbitrary number of arguments used to populate the array.
2. Like vec, take a collection and use it to populate the array.

[CLJ-178] Reloading core.clj from REPL fails with print-method exception

Tue, 28 Sep 2010 15:34:00 -0500

Example REPL session:

(in-ns 'clojure.core)
(def source-file "/path/to/clojure/src/clj/clojure/core.clj")
(load-string (slurp source-file))
</code></pre>

Result:
<pre><code>
java.lang.IllegalArgumentException: No method in multimethod 'print-method' for dispatch value: class clojure.lang.Var
Exception in thread "main" java.lang.IllegalArgumentException: No method in multimethod 'print-method' for dispatch value: class java.lang.String
        at clojure.lang.MultiFn.getFn(MultiFn.java:115)
        at clojure.lang.MultiFn.invoke(MultiFn.java:161)
        at clojure.core$pr_on__1315.invoke(Unknown Source)
        at clojure.core$pr__1318.invoke(Unknown Source)
        at clojure.lang.AFn.applyToHelper(AFn.java:173)
        at clojure.lang.RestFn.applyTo(RestFn.java:137)
        at clojure.core$apply__183.doInvoke(Unknown Source)
        at clojure.lang.RestFn.invoke(RestFn.java:428)
        at clojure.core$print__1332.doInvoke(Unknown Source)
        at clojure.lang.RestFn.invoke(RestFn.java:413)
        at clojure.core$printf__2285.doInvoke(Unknown Source)
        at clojure.lang.RestFn.invoke(RestFn.java:428)
        at clojure.main$repl_prompt__6713.invoke(main.clj:41)
        at clojure.main$repl__6737.doInvoke(main.clj:199)
        at clojure.lang.RestFn.invoke(RestFn.java:426)
        at clojure.main$repl_opt__6777.invoke(main.clj:251)
        at clojure.main$main__6812.doInvoke(main.clj:338)
        at clojure.lang.RestFn.invoke(RestFn.java:402)
        at clojure.lang.Var.invoke(Var.java:355)
        at clojure.lang.AFn.applyToHelper(AFn.java:171)
        at clojure.lang.Var.applyTo(Var.java:476)
        at clojure.main.main(main.java:37)