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< h1 > Higher order function in zsh< / h1 >
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< p > UPDATE: < a href = "http://nicholassterling.wordpress.com/2012/03/30/a-zsh-map-function/" > Nicholas Sterling had discovered a way to implement anonymous functions< / a > Thanks!< / p >
< p > With this last version you should use < code > map< / code > if you use external function. < code > mapl< / code > to use lambda function. And < code > mapa< / code > for arithmetic operations.< / p >
< p > Example:< / p >
< div class = "sourceCode" id = "cb1" > < pre class = "sourceCode zsh" > < code class = "sourceCode zsh" > < a class = "sourceLine" id = "cb1-1" title = "1" > $ filterl < span class = "st" > 'echo $1|grep a > /dev/null'< / span > ab < span class = "kw" > cd< / span > ef ada< / a >
< a class = "sourceLine" id = "cb1-2" title = "2" > ab< / a >
< a class = "sourceLine" id = "cb1-3" title = "3" > ada< / a >
< a class = "sourceLine" id = "cb1-4" title = "4" > < / a >
< a class = "sourceLine" id = "cb1-5" title = "5" > $ folda < span class = "st" > '$1+$2'< / span > < span class = "dt" > {1..5}< / span > < / a >
< a class = "sourceLine" id = "cb1-6" title = "6" > 15< / a >
< a class = "sourceLine" id = "cb1-7" title = "7" > < / a >
< a class = "sourceLine" id = "cb1-8" title = "8" > $ folda < span class = "st" > '$1*$2'< / span > < span class = "dt" > {1..20}< / span > < / a >
< a class = "sourceLine" id = "cb1-9" title = "9" > 2432902008176640000< / a >
< a class = "sourceLine" id = "cb1-10" title = "10" > < / a >
< a class = "sourceLine" id = "cb1-11" title = "11" > $ mapl < span class = "st" > 'echo X $1:t Y'< / span > ~/.zsh/functional/src/*< / a >
< a class = "sourceLine" id = "cb1-12" title = "12" > X each Y< / a >
< a class = "sourceLine" id = "cb1-13" title = "13" > X filter Y< / a >
< a class = "sourceLine" id = "cb1-14" title = "14" > X fold Y< / a >
< a class = "sourceLine" id = "cb1-15" title = "15" > X map Y< / a >
< a class = "sourceLine" id = "cb1-16" title = "16" > < / a >
< a class = "sourceLine" id = "cb1-17" title = "17" > $ mapa < span class = "st" > '$1*2'< / span > < span class = "dt" > {1..3}< / span > < / a >
< a class = "sourceLine" id = "cb1-18" title = "18" > 2< / a >
< a class = "sourceLine" id = "cb1-19" title = "19" > 4< / a >
< a class = "sourceLine" id = "cb1-20" title = "20" > 6< / a >
< a class = "sourceLine" id = "cb1-21" title = "21" > < / a >
< a class = "sourceLine" id = "cb1-22" title = "22" > $ mapl < span class = "st" > 'echo result $1'< / span > < span class = "ot" > $(< / span > mapa < span class = "st" > '$1+5'< / span > < span class = "ot" > $(< / span > mapa < span class = "st" > '$1*2'< / span > < span class = "dt" > {1..3}< / span > < span class = "ot" > ))< / span > < / a >
< a class = "sourceLine" id = "cb1-23" title = "23" > result 7< / a >
< a class = "sourceLine" id = "cb1-24" title = "24" > result 9< / a >
< a class = "sourceLine" id = "cb1-25" title = "25" > result 11< / a > < / code > < / pre > < / div >
< p > < span class = "sc" > < abbr title = "Too long; didn't read" > tl;dr< / abbr > : < / span > some simple implementation of higher order function for zsh.< / p >
< / div >
< p > Why is it important to have these functions? Simply because, the more I programmed with zsh the more I tended to work using functional programming style.< / p >
< p > The minimal to have better code are the functions < code > map< / code > , < code > filter< / code > and < code > fold< / code > .< / p >
< p > Let’ < / p >
< p > Before ⇒< / p >
< div class = "sourceCode" id = "cb2" > < pre class = "sourceCode zsh" > < code class = "sourceCode zsh" > < a class = "sourceLine" id = "cb2-1" title = "1" > < span class = "co" > # for each directory in projects dir< / span > < / a >
< a class = "sourceLine" id = "cb2-2" title = "2" > < span class = "kw" > for< / span > toProject < span class = "kw" > in< / span > /path/to/projects/*< span class = "kw" > (< / span > /N< span class = "kw" > )< / span > ; < span class = "kw" > do< / span > < / a >
< a class = "sourceLine" id = "cb2-3" title = "3" > < span class = "co" > # toProject is /path/to/projects/foo< / span > < / a >
< a class = "sourceLine" id = "cb2-4" title = "4" > < span class = "co" > # project become foo (:t for tail)< / span > < / a >
< a class = "sourceLine" id = "cb2-5" title = "5" > < span class = "ot" > project=${toProject:t}< / span > < / a >
< a class = "sourceLine" id = "cb2-6" title = "6" > < span class = "kw" > for< / span > toResource < span class = "kw" > in< / span > < span class = "ot" > $toProject< / span > /resources/*.gif< span class = "kw" > (< / span > .N< span class = "kw" > )< / span > ; < span class = "kw" > do< / span > < / a >
< a class = "sourceLine" id = "cb2-7" title = "7" > convert < span class = "ot" > $toResource< / span > < span class = "ot" > ${toResource:r}< / span > .png < span class = "kw" > & & < / span > < span class = "kw" > \< / span > < / a >
< a class = "sourceLine" id = "cb2-8" title = "8" > \< span class = "kw" > rm< / span > -f < span class = "ot" > $toResource< / span > < / a >
< a class = "sourceLine" id = "cb2-9" title = "9" > < span class = "kw" > done< / span > < / a >
< a class = "sourceLine" id = "cb2-10" title = "10" > < span class = "kw" > done< / span > < / a > < / code > < / pre > < / div >
< ul >
< li > The < code > (/N)< / code > means to select only directory and not to crash if there isn’ < / li >
< li > The < code > (.N)< / code > means to select only files and not to crash if there isn’ < / li >
< li > The < code > :t< / code > means tail; if < code > toto=/path/to/file.ext< / code > then < code > ${toto:t}=file.ext< / code > .< / li >
< / ul >
< p > After ⇒< / p >
< div class = "sourceCode" id = "cb3" > < pre class = "sourceCode bash" > < code class = "sourceCode bash" > < a class = "sourceLine" id = "cb3-1" title = "1" > < span class = "fu" > gif_to_png()< / span > < span class = "kw" > {< / span > < span class = "ex" > convert< / span > < span class = "va" > $1< / span > < span class = "va" > ${1:r}< / span > .png < span class = "kw" > & & < / span > \< span class = "fu" > rm< / span > -f < span class = "va" > $1< / span > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb3-2" title = "2" > < / a >
< a class = "sourceLine" id = "cb3-3" title = "3" > < span class = "fu" > handle_resources()< / span > < span class = "kw" > {< / span > < span class = "ex" > map< / span > gif_to_png < span class = "va" > $1< / span > /resources/*.gif(.N) < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb3-4" title = "4" > < / a >
< a class = "sourceLine" id = "cb3-5" title = "5" > < span class = "ex" > map< / span > handle_resources /path/to/projects/*(/N)< / a > < / code > < / pre > < / div >
< p > No more bloc! It might be a little bit harder to read if you’ < / p >
< p > Another example with some tests.< / p >
< p > Find all files in project not containing an < code > s< / code > which their name contains their project name:< / p >
< p > Before ⇒< / p >
< div class = "sourceCode" id = "cb4" > < pre class = "sourceCode zsh" > < code class = "sourceCode zsh" > < a class = "sourceLine" id = "cb4-1" title = "1" > < span class = "kw" > for< / span > toProject < span class = "kw" > in< / span > Projects/*; < span class = "kw" > do< / span > < / a >
< a class = "sourceLine" id = "cb4-2" title = "2" > < span class = "ot" > project=$toProject< / span > :t< / a >
< a class = "sourceLine" id = "cb4-3" title = "3" > < span class = "kw" > if< / span > < span class = "kw" > print< / span > -- project < span class = "kw" > |< / span > < span class = "kw" > grep< / span > -v s < span class = "kw" > > < / span > /dev/null< / a >
< a class = "sourceLine" id = "cb4-4" title = "4" > < span class = "kw" > then< / span > < / a >
< a class = "sourceLine" id = "cb4-5" title = "5" > < span class = "kw" > print< / span > < span class = "ot" > $project< / span > < / a >
< a class = "sourceLine" id = "cb4-6" title = "6" > < span class = "kw" > for< / span > toResource < span class = "kw" > in< / span > < span class = "ot" > $toProject< / span > /*< span class = "kw" > (< / span > .N< span class = "kw" > )< / span > ; < span class = "kw" > do< / span > < / a >
< a class = "sourceLine" id = "cb4-7" title = "7" > < span class = "kw" > if< / span > < span class = "kw" > print< / span > -- < span class = "ot" > ${toResource:t}< / span > < span class = "kw" > |< / span > < span class = "kw" > grep< / span > < span class = "ot" > $project< / span > < span class = "kw" > > < / span > /dev/null; < span class = "kw" > then< / span > < / a >
< a class = "sourceLine" id = "cb4-8" title = "8" > < span class = "kw" > print< / span > -- < span class = "st" > " X < / span > < span class = "ot" > $toResource< / span > < span class = "st" > " < / span > < / a >
< a class = "sourceLine" id = "cb4-9" title = "9" > < span class = "kw" > fi< / span > < / a >
< a class = "sourceLine" id = "cb4-10" title = "10" > < span class = "kw" > done< / span > < / a >
< a class = "sourceLine" id = "cb4-11" title = "11" > < span class = "kw" > fi< / span > < / a >
< a class = "sourceLine" id = "cb4-12" title = "12" > < span class = "kw" > done< / span > < / a > < / code > < / pre > < / div >
< p > After ⇒< / p >
< div class = "sourceCode" id = "cb5" > < pre class = "sourceCode zsh" > < code class = "sourceCode zsh" > < a class = "sourceLine" id = "cb5-1" title = "1" > < span class = "fu" > contain_no_s()< / span > < span class = "kw" > {< / span > < span class = "kw" > print< / span > < span class = "ot" > $1< / span > < span class = "kw" > |< / span > < span class = "kw" > grep< / span > -v s < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb5-2" title = "2" > < / a >
< a class = "sourceLine" id = "cb5-3" title = "3" > < span class = "kw" > function< / span > < span class = "fu" > verify_file_name< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb5-4" title = "4" > < span class = "kw" > local< / span > < span class = "ot" > project=$1< / span > :t< / a >
< a class = "sourceLine" id = "cb5-5" title = "5" > < span class = "fu" > contains_project_name()< / span > < span class = "kw" > {< / span > < span class = "kw" > print< / span > < span class = "ot" > $1< / span > :t < span class = "kw" > |< / span > < span class = "kw" > grep< / span > < span class = "ot" > $project< / span > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb5-6" title = "6" > map < span class = "st" > " print -- X" < / span > < span class = "ot" > $(< / span > filter contains_project_name < span class = "ot" > $1< / span > /*< span class = "kw" > (< / span > .N< span class = "kw" > )< / span > < span class = "ot" > )< / span > < / a >
< a class = "sourceLine" id = "cb5-7" title = "7" > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb5-8" title = "8" > < / a >
< a class = "sourceLine" id = "cb5-9" title = "9" > map verify_file_name < span class = "ot" > $(< / span > filter contain_no_s Projects/* < span class = "ot" > )< / span > < / a > < / code > < / pre > < / div >
< p > Also, the first verstion is a bit easier to read. But the second one is clearly far superior in architecture. I don’ < / p >
< p > You can find an < a href = "https://github.com/Tarrasch/zsh-functional" > updated version of the code (thanks to Arash Rouhani)< / a > . An older version is < a href = "https://github.com/yogsototh/zsh_functional" > here thought< / a > . Here is the (first version) source code:< / p >
< div class = "sourceCode" id = "cb6" > < pre class = "sourceCode zsh" > < code class = "sourceCode zsh" > < a class = "sourceLine" id = "cb6-1" title = "1" > < span class = "co" > #!/usr/bin/env zsh< / span > < / a >
< a class = "sourceLine" id = "cb6-2" title = "2" > < / a >
< a class = "sourceLine" id = "cb6-3" title = "3" > < span class = "co" > # Provide higer-order functions < / span > < / a >
< a class = "sourceLine" id = "cb6-4" title = "4" > < / a >
< a class = "sourceLine" id = "cb6-5" title = "5" > < span class = "co" > # usage:< / span > < / a >
< a class = "sourceLine" id = "cb6-6" title = "6" > < span class = "co" > #< / span > < / a >
< a class = "sourceLine" id = "cb6-7" title = "7" > < span class = "co" > # $ foo(){print " x: $1" }< / span > < / a >
< a class = "sourceLine" id = "cb6-8" title = "8" > < span class = "co" > # $ map foo a b c d< / span > < / a >
< a class = "sourceLine" id = "cb6-9" title = "9" > < span class = "co" > # x: a< / span > < / a >
< a class = "sourceLine" id = "cb6-10" title = "10" > < span class = "co" > # x: b< / span > < / a >
< a class = "sourceLine" id = "cb6-11" title = "11" > < span class = "co" > # x: c< / span > < / a >
< a class = "sourceLine" id = "cb6-12" title = "12" > < span class = "co" > # x: d< / span > < / a >
< a class = "sourceLine" id = "cb6-13" title = "13" > < span class = "kw" > function< / span > < span class = "fu" > map< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-14" title = "14" > < span class = "kw" > local< / span > < span class = "ot" > func_name=$1< / span > < / a >
< a class = "sourceLine" id = "cb6-15" title = "15" > < span class = "kw" > shift< / span > < / a >
< a class = "sourceLine" id = "cb6-16" title = "16" > < span class = "kw" > for< / span > elem < span class = "kw" > in< / span > < span class = "ot" > $@< / span > ; < span class = "kw" > print< / span > -- < span class = "ot" > $(< / span > < span class = "kw" > eval< / span > < span class = "ot" > $func_name< / span > < span class = "ot" > $elem)< / span > < / a >
< a class = "sourceLine" id = "cb6-17" title = "17" > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb6-18" title = "18" > < / a >
< a class = "sourceLine" id = "cb6-19" title = "19" > < span class = "co" > # $ bar() { print $(($1 + $2)) }< / span > < / a >
< a class = "sourceLine" id = "cb6-20" title = "20" > < span class = "co" > # $ fold bar 0 1 2 3 4 5< / span > < / a >
< a class = "sourceLine" id = "cb6-21" title = "21" > < span class = "co" > # 15< / span > < / a >
< a class = "sourceLine" id = "cb6-22" title = "22" > < span class = "co" > # -- but also< / span > < / a >
< a class = "sourceLine" id = "cb6-23" title = "23" > < span class = "co" > # $ fold bar 0 $( seq 1 100 )< / span > < / a >
< a class = "sourceLine" id = "cb6-24" title = "24" > < span class = "kw" > function< / span > < span class = "fu" > fold< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-25" title = "25" > < span class = "kw" > if< / span > < span class = "kw" > ((< / span > < span class = "ot" > $#< / span > < 2< span class = "kw" > ))< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-26" title = "26" > < span class = "kw" > print< / span > -- < span class = "st" > " ERROR fold use at least 2 arguments" < / span > < span class = "kw" > > & 2< / span > < / a >
< a class = "sourceLine" id = "cb6-27" title = "27" > < span class = "kw" > return< / span > 1< / a >
< a class = "sourceLine" id = "cb6-28" title = "28" > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb6-29" title = "29" > < span class = "kw" > if< / span > < span class = "kw" > ((< / span > < span class = "ot" > $#< / span > < 3< span class = "kw" > ))< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-30" title = "30" > < span class = "kw" > print< / span > -- < span class = "ot" > $2< / span > < / a >
< a class = "sourceLine" id = "cb6-31" title = "31" > < span class = "kw" > return< / span > 0< / a >
< a class = "sourceLine" id = "cb6-32" title = "32" > < span class = "kw" > }< / span > < span class = "kw" > else< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-33" title = "33" > < span class = "kw" > local< / span > < span class = "ot" > acc< / span > < / a >
< a class = "sourceLine" id = "cb6-34" title = "34" > < span class = "kw" > local< / span > < span class = "ot" > right< / span > < / a >
< a class = "sourceLine" id = "cb6-35" title = "35" > < span class = "kw" > local< / span > < span class = "ot" > func_name=$1< / span > < / a >
< a class = "sourceLine" id = "cb6-36" title = "36" > < span class = "kw" > local< / span > < span class = "ot" > init_value=$2< / span > < / a >
< a class = "sourceLine" id = "cb6-37" title = "37" > < span class = "kw" > local< / span > < span class = "ot" > first_value=$3< / span > < / a >
< a class = "sourceLine" id = "cb6-38" title = "38" > < span class = "kw" > shift< / span > 3< / a >
< a class = "sourceLine" id = "cb6-39" title = "39" > < span class = "ot" > right=$(< / span > fold < span class = "ot" > $func_name< / span > < span class = "ot" > $init_value< / span > < span class = "ot" > $@< / span > < span class = "ot" > )< / span > < / a >
< a class = "sourceLine" id = "cb6-40" title = "40" > < span class = "ot" > acc=$(< / span > < span class = "kw" > eval< / span > < span class = "st" > " < / span > < span class = "ot" > $func_name< / span > < span class = "st" > < / span > < span class = "ot" > $first_value< / span > < span class = "st" > < / span > < span class = "ot" > $right< / span > < span class = "st" > " < / span > < span class = "ot" > )< / span > < / a >
< a class = "sourceLine" id = "cb6-41" title = "41" > < span class = "kw" > print< / span > -- < span class = "ot" > $acc< / span > < / a >
< a class = "sourceLine" id = "cb6-42" title = "42" > < span class = "kw" > return< / span > 0< / a >
< a class = "sourceLine" id = "cb6-43" title = "43" > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb6-44" title = "44" > < span class = "kw" > }< / span > < / a >
< a class = "sourceLine" id = "cb6-45" title = "45" > < / a >
< a class = "sourceLine" id = "cb6-46" title = "46" > < span class = "co" > # usage:< / span > < / a >
< a class = "sourceLine" id = "cb6-47" title = "47" > < span class = "co" > #< / span > < / a >
< a class = "sourceLine" id = "cb6-48" title = "48" > < span class = "co" > # $ baz() { print $1 | grep baz }< / span > < / a >
< a class = "sourceLine" id = "cb6-49" title = "49" > < span class = "co" > # $ filter baz titi bazaar biz< / span > < / a >
< a class = "sourceLine" id = "cb6-50" title = "50" > < span class = "co" > # bazaar< / span > < / a >
< a class = "sourceLine" id = "cb6-51" title = "51" > < span class = "kw" > function< / span > < span class = "fu" > filter< / span > < span class = "kw" > {< / span > < / a >
< a class = "sourceLine" id = "cb6-52" title = "52" > < span class = "kw" > local< / span > < span class = "ot" > predicate=$1< / span > < / a >
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