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EXAMPLES.md

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All Compiler Instructions

Improvement on a shell one-liner

objdump -d /usr/bin/* | cut -f3 | ja '~.{%/^[a-z]+/}{`1}'

All packages on Hackage

cabal list --simple | ja '~.$1'

(one can download all packages from Hackage with:)

cabal list --simple | ja '~.$1' | xargs cabal get

This is simpler than:

cabal list --simple | cut -d' ' -f1 | sort -u

Get Latest Version (Cabal)

cabal info splitmix \
    | ja -R '\n[^:\n]*:' -b -F'\s*,\s*' '[x ~* 1 /(\d+(\.\d+)*)/]:?{%/Versions available:/}{[y]|>`$}'

Prune Branches (Git)

git branch --contains | ja '{%/^[^\*]/}{`0}' | xargs git branch -d

Create SQL Table From CSV

ja --csv "{ix=1}{sprintf'CREATE TABLE c (%s);'([x+', '+y]|>[sprintf '%s TEXT' x]¨\`$)}" -i data.csv
CREATE TABLE c (Series_reference TEXT, Period TEXT, Data_value TEXT, STATUS TEXT, UNITS TEXT);

Deduplicate Dependencies

cdeps pyc/apple.c | ja "[x+' '+y]|> ~.{|subs /[^\/]+\/\.\.\// '' \`0}"

This is not entirely rigorous since dir1/dir2/../file is not always dir1/../file.

cdeps pyc/apple.c | xargs realpath | ja "[x+' '+y]|> ~.\$0"

Extract Fixity Declarations for HLint

{%/infix(r|l)?\s+\d+/}{sprintf '- fixity: %s' `0}

Equivalently:

[sprintf '- fixity: %s' x]¨(~/infix(r|l)?\s+\d+/)#.$0

This is equivalent to hlint --find src/FILE.hs | rg '^- fixity:', except it works on Happy, Alex, etc. preprocessor files.

Trim URL

echo 'https://soundcloud.com/shitzulover07/ayesha-erotica-vacation-bible-school?utm_medium=text&utm_campaign=social_sharing' \
    | ja '.?{|`1 ~* 1 /([^\?]*)/}'

yields

https://soundcloud.com/shitzulover07/ayesha-erotica-vacation-bible-school

Mac

Download a video using yt-dlp, trimming tracking information from the URL:

yt-dlp "$(pbpaste | ja '.?{|`1 ~* 1 /([^\?]*)/}')"

Display Name of Terminal

Modification of a StackExchange one-liner using Awk.

ps -aux | rg "$(ps -p $$ -o ppid=)" | ja '{ix=1}{`*}'

Filter GHC error messages to only those originating in some file

cabal -v0 build |& ja -R'\n\n' -F':' "{\`1='src/Ty.hs'}{\`0}"

Find all distinct language extensions used in a project

fd '\.hs$' . -x ja '.?{|`0 ~* 1 /LANGUAGE\s*([a-zA-Z]*)\s*#-/}' -i | ja '~.$0'

This is not entirely rigorous; it does not account for {-# LANGUAGE Xxx,Yyy #-}.

This could be used to populate the other-extensions field in a .cabal file.

NYC Vaccine Effectiveness

curl -sL https://raw.githubusercontent.com/nychealth/coronavirus-data/master/latest/now-weekly-breakthrough.csv | \
    ja ',[1.0-x%y] {ix>1}{`5:} {ix>1}{`17:}' -F,

Ctags

ja -F= '{%/let\s*[[:lower:]][[:alnum:]]*/}{(⍳.`1)}' -i lib.dhall

Inflation

curl https://www.stats.govt.nz/assets/Uploads/Food-price-index/Food-price-index-September-2023/Download-data/food-price-index-september-2023-weighted-average-prices.csv -o food-prices.csv
ja --csv '(%)\. {%/Apple/}{`3:}' -i food-prices.csv

Get Environment Variable

printenv | ja -F= '{%/^PATH/}{`2}'

Extract All Symbols

nm -D $(which pandoc) \
    | sed 's/\([^z]\)zi/\1./g ;s/\([^z]\)zm/\1-/g; s/\([^z]\)zd/\1$/g; s/ZC/:/g; s/zz/z/g' \
    | ja '~..?{`2 ~ /^(T|t)$/}{`3 ~* 1 /([A-Za-z][A-Za-z0-9\-]*\-\d+(\.\d+)*)\-[0-9a-f]{4}/}'

Extract Library Versions (Unstripped)

@include'lib/string.jac'

unlines¨{% /-lHS/}{captures `0 1 /-lHS([A-Aa-z][A-Za-z0-9\-]*\d+(\.\d+)*)/}

readelf -p '.debug-ghc-link-info' $(which pandoc) | ja -R, '.?{|`0 ~* 1 /-lHS([A-Aa-z][A-Za-z0-9\-]*\d+(\.\d+)*)/}'

readelf -p '.debug-ghc-link-info' $(which pandoc) | tr ',' '\n' | rg '\-lHS([A-Aa-z][A-Za-z0-9\-]*\d+(\.\d+)*)' -o -r'$1'

Show Dynamic Library Dependencies

readelf -d $(which vim) | ja '.?{%/Shared library/}{`5 ~* 1 /\[(.*)\]/}'

Show Dynamic Library Dependencies (Mac)

otool -l $(locate libpng.dylib | tail -n1) | ja -R'Load command' '{%/LC_LOAD_DYLIB/}{`7}'

Show rpaths (Mac)

otool -l $(locate libapple.dylib | tail -n1) | ja -R 'Load command' '{%/LC_RPATH/}{`7}'

Present RUNPATH (ELF)

readelf -d libapple.so | \
    ja '.?{%/RUNPATH/}{`5 ~* 1 /\[(.*)\]/}' | \
    tr ':' '\n'

Show Machine Architecture (ELF)

readelf -h $(locate libpng.so | tail -n1) | ja -F':\s*' '{%/Machine/}{`2}'

Tag Releases

Use the following to create a git tag by extracting the current version number from the .cabal file:

git tag "$(ja -F'\s*:\s*' '{%/^\s*version/}{`2}' -i jacinda.cabal)"

Imitate killall

To kill all running GHC processes:

kill $(ps u | ja '{%/ghc/}{`2}')

Format All Code In a Haskell Project

fd '\.hs$' $(ja -F'\s*:\s*' '{%/hs-source-dirs/}{`2}' -i jacinda.cabal) -x stylish-haskell -i

Count lines of code

fd '\.(c|h)$' -x wc -l | ja '(+)|0 $1:'

Linecount

Count nonblank lines:

(+)|0 {%/./}{1}

Count blank lines:

(+)|0 {%/^$/}{1}

Count Occurrences

(+)|0 {%/Bloom/}{1}

Longest Line

max|_1 #¨$0

All lines >110 bytes:

{#`0>110}{`0}'

[#x>110] #. $0

Find all Haskell code >80 bytes wide

fd '\.hs$' -x ja '[#x>80] #. $0' -i

Is there a line >110 bytes?

(||)|#f {#`0>110}{#t}

(max|_1 #¨$0) > 110

Prelude

One could write

sum := [(+)|0 x]

product := [(*)|1 x]

or := [(||)|#f x]

and := [(&)|#t x]

count := [(+)|0 [:1"x]

maximum := [max|_1 x]

Print Line Number

(+)^0 [:1"$0

{|⍳}

Generate Vim Tag Files for Futhark

futhark defs lib/github.com/vmchale/img-fut/img.fut | \
    ja -F'[\s+:]' "{|sprintf '%s\t%s\tcall cursor(%s,%s)' (\`2.\`3.\`4.(splitc \`5 '-').1)}"

Extract C Dependencies

@include 'prelude/fn.jac'

fn dirname(x) :=
  x ~* 1 /([^\/]*\/)*(.*)/;

fn src(d) :=
  d ~* 1 /^\s*#include\s*"([^"]*)"/;

let
  val dir := fromMaybe '.' (dirname fp) + '/'
in [(dir +)"src x]:?$0 end

One would invoke like so (zsh):

for d in $(ja run cdeps.jac -i src/frame.c); do realpath $d; done

This could be used for better dependency tracking in a Makefile, viz.

C_SRC := $(shell for d in $$(ja run cdeps.jac -i src/main.c); do realpath $$d; done | ja "[x+' '+y]|> \$$0")

src/main.c: $(C_SRC)

Get Package Directories (Python)

% python3 -m site | ja ".?{|\`1 ~* 1 /([^']*site-packages)/}"
/Users/vanessa/Library/Python/3.13/lib/python/site-packages
/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages

We could use this to pass flags to a C compiler like so:

% python3 -m site | ja "[x+' '+y]|>(sprintf'-L%s')¨.?{|\`1 ~* 1 /([^']*site-packages)/}"
-L/Users/vanessa/Library/Python/3.13/lib/python/site-packages -L/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/site-packages

Count Matches in Repo

rg 'traverse' -c | ja -F: '(+)|>$2:i'