CODEWITHSUNDEEP
bashshellnpmnpm-scripts
Patricio Vargas
Patricio Vargas

Reputation: 5522

pass parameters to bash script through npm run

I'm new to writting bash script and I have a npm package that I created https://www.npmjs.com/package/comgen

Bash

days=3
hours=24
minutes=60
totalNumberOfCommits=3
lenghtOfTime=$((days*hours*minutes))
arrayOfCommits=$(shuf -i 1-$lenghtOfTime -n $totalNumberOfCommits | sort -r -n)

for index in $arrayOfCommits
  do
    randomMessage=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)  
    git commit --allow-empty --date "$(date -d "-$index minutes")" -m "$randomMessage"
  done 
git push origin master

You run it like this npm run comgen I want it to run like this:

npm run comgen -days "x number of days" -totalNumberOfCommits "x number of commits"

Package.json

"scripts": {
    "comgen": "commit-generator.sh"
 },

Where the number of days and the total of commits passed will replace the number in the variables I have in the bash script.

I read this SO questions before postins my own: https://unix.stackexchange.com/questions/32290/pass-command-line-arguments-to-bash-script

Upvotes: 1

Views: 3266

Answers (2)

Nikhil Mandlik
Nikhil Mandlik

Reputation: 21

Try this

package.json

"scripts": {
    "comgen": "commit-generator.sh"
 },

commit-generator.sh

 #!/bin/bash 
echo $npm_config_days
echo $npm_config_hours

and finally in terminal

npm run comgen --days=foo --hours=bar

output:

> commit-generator.sh

foo
bar

Upvotes: 2

iBug
iBug

Reputation: 37227

I'm not sure how exactly npm works, but from my experience I guess that command-line arguments are passed directly to the called executable (binary or script). This means your script is actually called like

/path/to/comgen -days "x number of days" -totalNumberOfCommits "x number of commits"

Now it's pure Bash stuff to parse the cmdline arguments. You evaluate an option and decide what the next value is:

days=3
hours=24
minutes=60
totalNumberOfCommits=3

while [ $# -ne 0 ]; do
  case "$1" in
    "-d"|"-days") days=$2; shift 2;;
    "-tc"|"-totalNumberOfCommits") totalNumberOfCommits=$2; shift 2;;
  # "-x"|"-xx"|"-xxx") : Process another option; shift 2;;
    *) break;;
  esac
done

lenghtOfTime=$((days*hours*minutes))

... rest of the code

Upvotes: 2

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