On 5/13/06, Beni Cherniavsky <[EMAIL PROTECTED]> wrote:
> On 5/12/06, Beni Cherniavsky <[EMAIL PROTECTED]> wrote:
[...]
word_concat(a, 1) -> a1
list_concat([a b], [1 2]) -> [a b 1 2]
word_product([a b], [1 2]) -> [a1 a2 b1 b2]
list_product([a b], [1 2]) -> [a 1 a 2 b 1 b 2]
word_parallel([a b], [1 2]) -> [a1 b2]
list_parallel([a b], [1 2]) -> [a 1 b 2]
Good points!
[...]
word_concat() doesn't really exist because words are built from items
like variable expansion that produce lists. In fish, it's a special
case of word_product(). [...]
Is it something like this?
function strcat
for a in $argv
printf "%s" $a
end
end
The top level of a command line is list_concat() but it's not
availiable otherwise.
set ar3 $ar1 $ar2
list_product() is availiable through braces but in a surprising way.
[reordered]
[It is] sometimes useful: ``fgrep {-f,(ls *.words)}`` expands to
``fgrep -f some.words -f more.words``
How often is it useful, really? You can achieve the fgrep expression as
fgrep -f' '{ls *.words}
and handle cases with three arrays, inline as
for a in $arr1
for b in $arr2
for c in $arr3
echo $a\n$b\n$c
end
end
end
[...]
Note that all implementations using external commands suffer from
false splitting if any word contains newlines.
[...]
To avoid this, you can use "set newArray[$i] oldArray1[$j]", instead
of "echo".
[...] I hacked perlish references int the flat data structures of fish.
[...]
Well, if we want a function, we have to use the array names, as in
your implementations.
function interleave_arrays -d 'Interleave the arrays named by the arguments'
set i 1
for j in (seq (count $$argv[1]))
for k in (seq (count $argv))
set arr[$i] $$argv[$k][$j]
set i (echo $i+1 | bc)
end
end
end
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