Indeed with Common Lisp format, it is a one liner:
(cl-format true "~{~{~3A ~...@a ~...@a ~A~%~}~}" lines)
produces:
-rw 13290 1216183460872 LispExample_Flow.png
-rw 3211 1217537516267 PDFReport.java
(nicely aligned in a fixed-width font)
CL format is available for Clojure at: http://github.com/tomfaulhaber/cl-format
A slightly nicer display is possible if we turn the number strings
into numbers:
(defn convert-nums [[a b c d]] [a (Long/parseLong b) (Long/parseLong
c) d])
(cl-format true "~{~{~3A ~8:D ~18:D ~A~%~}~}" (map convert-nums
lines))
produces:
-rw 13,290 1,216,183,460,872 LispExample_Flow.png
-rw 3,211 1,217,537,516,267 PDFReport.java
(again, nicely aligned in fixed-width)
Whether all of this is better or worse than the doseq/apply version is
a matter of personal taste. I happen to like the destructuring in the
format string. Others find it opaque and prefer to iterate explicitly
over the structures.
On Jan 26, 1:31 pm, BerlinBrown <[email protected]> wrote:
> I want to output a directory with a similar listing (see below), but
> only a fixed number of spaces. Is there a clojure approach to
> already do this.
>
> -rw 13290 1216183460872 LispExample_Flow.png
> -rw 3211 1217537516267 PDFReport.java
>
> I think in Common Lisp, the powerful 'format' could make this happen
> probably in one line. Anyone conjure a clojure approach?
>
> Basically, I need output with a fixed number of columns, I guess I use
> an 'array' of 20 spaces and then fill then fill the array with
> content.
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