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fp.sh
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fp.sh
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#! /bin/env sh
fp ()
(
# Tuple -- x y < <(echo X Y)
# fielder=",$IFS" Tuple -- x y < <(echo XX, YY)
Tuple () { IFS="${fielder:-$IFS}" read -r "${@:-x}" ; } &&
# trim $' \n U W U \n \n\n ' $' \n U W U \n \n\n '
trim () (Tuple -d "${trimmer:=鈥媫" -- s < <(echo "$@" "${trimmer}") && echo "$s") &&
# fp formatf "$@"
# formatter=' _%s' fp formatf $(seq 12)
# eq: seq 12 | f='printf \ _%s "$x"' fp per x
formatf () (printf "${formatter:-%s\n}" "$@") &&
# erro echo xxx
# erro fp formatf "$@"
erro () (1>&2 "$@") &&
iterate () (eval "$past" && while IFS="${fielder:-$IFS}" "$@" ; do eval "${iterator:-$f}" ; done && eval "$future") &&
# demos
Iterators ()
{
: fmt='%o: %o\n' n=16 fib
: fmt='%x: %x\n' n=16 fib
: mapas='"$y"' fmt='%d ' n=16 fib
# use tmp asigns
fib ()
(
_x=0 _y=0 _z=1 \
iterator='
test "$x" -eq "'"${n:-13}"'" && break ;
_x="$((x + 1))" _y="$((z))" _z="$((y + z))"
' fp iterate \
eval '
x="$_x" y="$_y" z="$_z" ;
printf '"'${fmt:-%d: %d\\n}' ${mapas:-\"\$x\" \"\$y\"}" &&
: ) ;
# or use the Tuple
fib ()
(
x=0 y=0 z=1 \
iterator='
test "$x" -eq "'"${n:-13}"'" && break ;
fielder=",$IFS" Tuple -- x y z < <(echo "$((x + 1)), $((z)), $((y + z))")
' fp iterate \
eval printf "'${fmt:-%d: %d\\n}' ${mapas:-\"\$x\" \"\$y\"}" &&
: ) ;
# fmt='%i %i, ' n=13 fib
# 0 0, 1 1, 2 1, 3 2, 4 3, 5 5, 6 8, 7 13, 8 21, 9 34, 10 55, 11 89, 12 144, 13 233,
:;
"$@" &&
:;
} &&
# seq 2 2 8 | cat -n | f='echo "$x -> $y"' fp per x y
# echo a,b,c:d,e,f: | fielder=, f='echo "$z ~ $x -> $y"' fp per -d : -- y x z
# per () (while IFS="${fielder:-$IFS}" read -r "${@:-p}" ; do eval "$f" ; done) &&
per () (iterator="${p:-$f}" iterate read -r "${@:-p}") &&
# seq 7 | acc=3 f='echo $((x + acc))' fp reduce -- x
# echo a,b,c:d,e,f: | fielder=, acc='' f='echo "$y .. $z .. $x ~ $acc"' fp reduce -d : -- x y z
# echo a,b,c:d,e,f: | fielder=, acc='' f='echo "$acc: $y .. $z .. $x"' fp reduce -d : -- x y z
# reduce () (while IFS="${fielder:-$IFS}" read -r "${@:-p}" ; do local acc="${preconcater:-${IFS: -1}}$(eval "$f")${concater:-${IFS: -1}}" ; done ; trim "$acc") &&
reduce () (concater="${concater:-${IFS: -1}}" preconcater="${preconcater}" acc="${preconcater}${acc}${concater}" f="$f" p='local acc="${preconcater}$(eval "$f")${concater}"' future='trim "$acc"' per "$@") &&
Reducers ()
{
: fib 16
: fib -- 2 2 32
: concater=':: ' fib -- 2 2 32
: ofs='| ' fib -- 2 2 32
: dont: concater=' ...' fib -- 2 2 32
: dont: concater=',...' fib -- 2 2 32
: dont: ofs=': ' concater=':...' fib -- 2 2 32
fib ()
(
local ofs="${ofs:-,}" &&
acc="0${ofs} 0${ofs} 1${ofs} _" \
f='
echo "$(
fielder="${ofs}$IFS" Tuple -d "${concater:-${IFS: -1}}" -- x y z _ < <(echo "$acc") ;
echo "$((x + 1))${ofs} $((z))${ofs} $((y + z))${ofs} ${q}" &&
: )${concater:-${IFS: -1}}${acc}"
' fp reduce q < <(seq "$@") &&
: ) ;
# ofs=' ' fib 13 | f='"$x $y"' fp map -- x y _ _ | tac | f='printf "%s, " "$x $y"' fp per -- x y
# 0 0, 1 1, 2 1, 3 2, 4 3, 5 5, 6 8, 7 13, 8 21, 9 34, 10 55, 11 89, 12 144, 13 233,
:;
"$@" &&
:;
} &&
# seq 2 2 8 | cat -n | f='"$x -> $y"' fp map x y
# echo a,b,c:d,e,f: | fielder=, f='"$z ~ $x -> $y"' fp map -d : -- y x z
map () (acc='' f='printf '"'${formatter:-%s}'"' "$acc"'"$f" reduce "$@") &&
# repeater=21 fp repeat AA BBB CCCC
# ofs='!?::' repeater=5 fp repeat AA BBB CCCC
# ofs=' ' concater=$'\n:;;:' repeater=3 fp repeat AA BBB CCCC
repeat () (formatf "$@" | f='"'"$(echo $(concater="${ofs:-$concater}" f='"\$str"' map _ < <(seq "${repeater:-3}") ) )"'"' map str) &&
# n=13 initer='0 0 1' init='Tuple -- x y z < <(echo "$initer") && echo "$x $y $z"' unfolder=' { Tuple -- x y z < <(echo "$((x + 1)) $((z)) $((y + z))") && echo "$x $y $z" ; } ' folder='echo "${acc} ${processes}"' delimiter=' &&' fp unfold eval 'eval "$(cat -) :"'
unfold () (seq -- "${n:-13}" | f="'$unfolder'" map _ | acc="$init" concater="${delimiter:-$concater}" f="${folder:-echo \"\$acc \$processes\"}" reduce -- processes | initer="$initer" "$@") &&
UnFolders ()
{
# seq 13 |
#
# f="'"' { Tuple -- x y z < <(echo "$((x + 1)) $((z)) $((y + z))") && echo "$x $y $z" ; } '"'" fp map _ |
# acc='Tuple -- x y z < <(echo "$init") && echo "$x $y $z"' f='echo "${acc} ${processes}"' concater=' &&' fp reduce -- processes |
# init='0 0 1' eval "$(cat -) :"
: echoer='printf "%s, " "$x $y"' n=16 fib
fib ()
(
n="${n}" echoer="${echoer:-echo \"\$x \$y \$z\"}" \
init='Tuple -- x y z < <(echo "$initer") && '"$echoer" \
unfolder=' { Tuple -- x y z < <(echo "$((x + 1)) $((z)) $((y + z))") && '"$echoer"' ; } ' \
folder='echo "${acc} ${processes}"' delimiter=' &&' \
initer='0 0 1' fp unfold eval 'eval "$(cat -) :"' &&
: ) ;
# echoer='printf "%s, " "$x $y"' n=13 fib
# 0 0, 1 1, 2 1, 3 2, 4 3, 5 5, 6 8, 7 13, 8 21, 9 34, 10 55, 11 89, 12 144, 13 233,
# or you wana direct ? then you need a folder by yourself, with your unfolder.
# seq 13 |
# f="'"' { Tuple -- x y z < <(echo "$((x + 1)) $((z)) $((y + z))") && echo "$x $y $z" ; } '"'" fp map _ |
# acc='0 0 1' f='Tuple -- x y z < <(echo "$acc") && erro echo "$x $y $z" && eval "$processes"' fp reduce -- processes
fib ()
(
n="${n}" echoer='echo "$x $y $z"' init='0 0 1' returner="${returner:-$echoer}" \
unfolder=' { Tuple -- x y z < <(echo "$((x + 1)) $((z)) $((y + z))") && '"$echoer"' ; } ' \
folder='Tuple -- x y z < <(echo "$acc") && erro '"$returner"' && eval "$processes"' \
fp unfold cat - | f="$returner" fp per -- x y z &&
: ) ;
# returner='printf "%s, " "$x $y"' n=13 fib
# 0 0, 1 1, 2 1, 3 2, 4 3, 5 5, 6 8, 7 13, 8 21, 9 34, 10 55, 11 89, 12 144, 13 233,
# attention: only last one is stdout, other all before it both are stderr.
:;
"$@" &&
:;
} &&
"$@" &&
: ) &&
: \
fp "$@"