cl-oju

What is oju? A Mysterious Sauce used as a special ingredient sourced (some would say pilfered) from an advanced civilization thirty years in the future (far beyond the late 1980's).

cl-oju: a few idioms, mostly relating to sequences, that I miss when writing Common Lisp.

There are many more comprehensive utility libraries out there, such as Serapeum. This one is focused on a fairly narrow goal: to provide fairly simple equivalents to core Clojure functions. Since I frequently reach for (and write) these out of habit, I wanted a place to put them.

I haven't needed to worry too much about comprehensiveness or performance, though PRs to improve either will be gratefully reviewed. I typically add these here when I reach for them out of habit while working in Common Lisp.

Note that I stick to the functional interface of familiar Clojure expressions, but do not worry about immutable data structures or laziness in this library.

If you're new to Common Lisp coming from Clojure, it may be better to learn "the Common Lisp way" of doing things than to rely on these functions; but this library can still be a reference point to see a way of doing things you're used to.

Supported operators:

comment
comp
drop
filter
frequencies
group-by
if-not
interleave
interpose
juxt
neg?
not=          (based on #'EQUAL)
partial
partition-all
partition-by
partition-n   (called "partition" in Clojure)
pos?
rand-int
rand-nth
range
repeatedly
slurp
sort-by
spit
str
take
take-while
when-not

Usage

Available on Quicklisp or Ultralisp:

(ql:quickload :cl-oju)

Example:

(in-package :cl-oju)

(mapcar (juxt (comp #'length #'str)
              #'identity)
        (repeatedly 10 (lambda () (rand-int 1000))))
;;=>
'((3 717) (3 508) (3 238) (3 366) (2 50) (3 564) (3 395) (2 18) (3 446) (3 935))

Testing / Building

make test should be sufficient to run the tests using SBCL, or make test-ecl for ECL. You can also run them in Docker (make docker), which is what the CI for this project does. You'll obviously need make and Docker installed for this.

License

MIT

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.