Awesome

jayin

Let's say you have a gitignore-like file:

# https://github.com/fritx/dotfiles
# .gitignore
*
!.gitignore
!README.md
!prs-welcome.svg
!.bashrc
!.bash_profile
!.exports
!.aliases
!.editorconfig

You want to cp the listed files to another folder.

Do it in bash?

files=$(cat .gitignore | sed /^\*$/d | sed s/\!//)
for file in $files; do cp $file ./dotfiles/; done

# or even
cat file | sed /^\*$/d | sed s/\!// \
  | while read -r file; do cp $file ./dotfiles/; done

WTF?

As a node.js developer, what if using just js flow/style?

cat .gitignore | js -ti 'x.trim().split(`\n`).slice(1).map(x => x.slice(1))' \
  | js -e 'exec(`cp ${x} ./dotfiles/`)'

# same as
cat .gitignore | js -ti 'x.trim().split(`\n`)' \
  | js 'x.slice(1)' \
  | js 'x.map(x => x.slice(1))' \
  | js -e 'exec(`cp ${x} ./dotfiles/`)'

Don't forget to take an alias if you want.

npm install -g jayin
alias js="jayin"

• x: current input value
• exec(cmd): child_process.execSync(cmd)
• -e: for each
• -ti: input as text
• -to: output as text
• -t: input/output both as text

jayin is based on through2.

If you've seen anything that is similar to this, don't hesitate to let me know ;)