On 28/03/2010, at 8:01 PM, B Smith-Mannschott wrote:
> On Sun, Mar 28, 2010 at 08:39, Antony Blakey <[email protected]> wrote:
>>
>> On 28/03/2010, at 4:42 PM, Antony Blakey wrote:
>>
>>> (defproject main "org.clojars.the-kenny:clojure-couchdb:0.2"
>>> :add-default-plugins true
>>> :description "Simple Clojure interface to Apache CouchDB, fork of the
>>> original project with function arguments instead of *server* and some other
>>> changes."
>>> :dependencies [["org.clojure:clojure:1.1.0-master-SNAPSHOT"]
>>> ["org.clojure:clojure-contrib:1.0-SNAPSHOT"]
>>> ["org.clojure:clojure-http-client:1.0.0-SNAPSHOT"]])
>>
>> Actually, it's even simpler than that because the string-format coordinates
>> removes the need to wrap the coordinate in a vector:
>
> True, but concatenating the three coordinates together into a single
> string smells like a [first normal form][1NF] violation to me. I think
> Leiningen's notation is a better fit and more idiomatic as Clojure,
> even if it is a little more verbose to type.
Having completed this now, so I can read leningen files, the problem is that
the leiningen format needs to be quoted i.e the macro needs to transform
:dependencies [[a/b "1.0"]]
into
:dependencies '[[a/b "1.0"]]
which means that the dependencies list cannot be computed dynamically (well,
without extra syntax to unquote). It would have been ok if leiningen required
quoted symbols e.g.
:dependencies [['a/b "1.0"]]
> - Clojure code manipulating poloyglot's notation is more complex
> because it must be parsed first, and then recombined. Leiningen's
> notation already is 'parsed'.
Parsing is still required in order to deal with the optional nature of the
group id and version number e.g.
(defmulti parse-reference class)
(defmethod parse-reference clojure.lang.Symbol
[reference]
(let [artifact (name reference)
group (if-let [g (namespace reference)] g artifact)]
{:group-id group :artifact-id artifact}))
(defmethod parse-reference clojure.lang.PersistentVector
[reference]
(let [ga (parse-reference (reference 0))]
(if (and (> (count reference) 1) (= (class (reference 1)) String))
(assoc ga :version (reference 1))
ga)))
So the difference is minor.
> - Editing just the version of a dependency (or the project itself) is
> a fairly common occurrence and is somewhat more awkward if you're
> editing only *part* of a string literal, rather than a single token.
Agreed.
Antony Blakey
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