pass parameters to bash script through npm run

Question

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

iBug · Accepted Answer · 2018-09-03 05:48:35Z

2

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

edited Sep 3, 2018 at 5:48

answered Sep 3, 2018 at 5:36

iBug

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3 Comments

Patricio Vargas Over a year ago

All I have to do know is now go to pass variables to the npm run comgen -d 5 -tc 10

Patricio Vargas Over a year ago

I got to the point where I can run this commit-generator.sh -d 4 -tc 10 in the terminal. Now, when I want to do npm run comgen -d 5 -tc 10 i get commit-generator.sh -d $1 -tc $2 "1" "10" in my package.json I have "scripts": { "comgen": "commit-generator.sh -d $1 -tc $2 " }

Patricio Vargas Over a year ago

i figured it out. My problem is that i need to pass the parameters with out the "-" and change the name in the bash script to be just d,tc,etc

Nikhil Mandlik · Accepted Answer · 2021-07-02 01:04:13Z

2

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

answered Jul 2, 2021 at 1:04

Nikhil Mandlik

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