Ok,
So I'm trying to write a leiningen plugin that takes some namespace
arguments. Let's call it *<myplugin>*. This is a brand new plugin, so
everything else is empty, and this value is present: *{:eval-in-leiningen
true}*. My problem happens when, in the context of the project *<myplugin>*
is acting on, the plugin code fails. I pass in some project-local namespace
that I want to eval (which is definitely present). And I get this
situation:
*Error*
java.lang.Exception: No namespace: <mynamespace> found
*Offending Code*
(defn check-foreach-namespace [namespaces]
(let [fnss (filter #(= Fubar (type (var-get %)))
(vals *(ns-publics (symbol (first namespaces)))*))]
(println "filtered-namespace [" fnss "]")))
(defn myplugin [project & args]
(check-foreach-namespace args))
So then, if I try to require the namespace being passed in, that too fails
like so:
*Error: *
java.io.FileNotFoundException: Could not locate <mynamespace_file.clj> on
classpath:
*Offending Code:*
(ns leiningen.chesk
(:require [clojure.test.check :as tc]
[clojure.test.check.generators :as gen]
[clojure.test.check.properties :as prop]))
(defn check-foreach-namespace [namespaces]
(let [nss (map *#(require (symbol %))* namespaces)
fnss (filter #(= clojure.test.check.generators.Generator (type
(var-get %)))
(vals (ns-publics (symbol (first nss)))))]
(println "filtered-namespace [" fnss "]")))
(defn myplugin [project & args]
(check-foreach-namespace args))
Looking around, I thought I had found some relevant instruction on how to
handle this gilardi scenario
<https://github.com/technomancy/leiningen/blob/master/doc/PLUGINS.md#evaluating-in-project-context>.
So I tried to use *eval-in-project* with and without namespace prefix, and
with several permutations of quoting. This is the error that occurs.
*Error: *
clojure.lang.Compiler$CompilerException: java.lang.ClassNotFoundException:
leiningen.core.eval
*Offending Code: *
(ns leiningen.chesk
(:require [clojure.test.check :as tc]
[clojure.test.check.generators :as gen]
[clojure.test.check.properties :as prop]))
(defn check-foreach-namespace [namespaces]
(let [fnss (filter #(= clojure.test.check.generators.Generator (type
(var-get %)))
(vals (ns-publics (symbol (first namespaces)))))]
(println "filtered-namespace [" fnss "]")))
(defn myplugin [project & args]
(*leiningen.core.eval/eval-in-project* project
(check-foreach-namespace args)
(map #(require (symbol %)) args)))
So something that looks like it should be straightforward, is not working
out as planned. I also can't quite see how other plugins are doing this.
lein-midje seems a bit cryptic (see here
<https://github.com/marick/lein-midje/blob/master/src/leiningen/midje.clj#L14-L23>
and here
<https://github.com/marick/Midje/blob/master/src/midje/repl.clj#L192-L235>).
Are there any clearer examples?
Tim Washington
Interruptsoftware.com <http://interruptsoftware.com>
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