CODEWITHSUNDEEP
rubybashyaml
Imaginaerum
Imaginaerum

Reputation: 779

Convert YAML array to Bash array

I've an YAML array:

myarray:
    - PHP
    - Perl
    - Python

How to convert it into bash array with ruby ?

Arr[0]='PHP'
Arr[1]='Perl'
Arr[2]='Python'

Upvotes: 1

Views: 3062

Answers (3)

glenn jackman
glenn jackman

Reputation: 246744

The bash mapfile command is useful to convert lines of stdin into an array:

$ cat file.yaml 
myarray:
    - PHP
    - Perl
    - Python
    - element with spaces

$ mapfile -t array < <(ruby -ryaml -e 'yaml = YAML.load(File.read(ARGV.shift)); puts yaml["myarray"].join("\n")' file.yaml)

$ for i in "${!array[@]}"; do echo "$i  ${array[i]}"; done
0  PHP
1  Perl
2  Python
3  element with spaces

This avoids having to use eval in the shell

Upvotes: 2

Fedalto
Fedalto

Reputation: 1567

I'm not sure if this is what you want.

In ruby, parse the yaml array and write an output for Bash to read as an array:

require 'yaml'

yaml_array = <<-eos
myarray:
    - PHP
    - Perl
    - Python
eos

yaml = YAML.load(yaml_array)
print "(#{yaml["myarray"].join(' ')})"

This ruby script will print (PHP Perl Python) to stdout.

You can then use it in Bash:

$ eval array=$(ruby ruby_script.rb)
$ echo ${array[0]}
PHP
$ echo ${array[1]}
Perl

Upvotes: 3

Devon Parsons
Devon Parsons

Reputation: 1288

require 'yaml'

yaml_text = "myarray:
    - PHP
    - Perl
    - Python"

yaml = YAML.load(yaml_text)
array = yaml["myarray"]

puts array.class #=> Array
puts array       #=> PHP
                 #=> Perl
                 #=> Python

Upvotes: 2

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