使用bash从文件名输入的JSON文件

Question

I am very new to bash scripting.

I have set of JSON files as follows:

sub-285345_task-EMOTION_acq-LR_idir-acq-LR_epi.json
sub-285345_task-EMOTION_acq-LR_idir-acq-RL_epi.json
sub-285345_task-EMOTION_acq-RL_idir-acq-LR_epi.json
sub-285345_task-EMOTION_acq-RL_idir-acq-RL_epi.json

Now looking at the each .json filename, I want to have key value pair inside the .json file. For eg: for file sub-285345_task-EMOTION_acq-LR_idir-acq-LR_epi.json i want to include following information:

{
"PhaseEncodingDirection": "-i",
"TotalReadoutTime": 0.08346,
"IntendedFor": "func/sub-285345_task-rest_acq-LR_run-01_bold.nii.gz"
}

PhaseENcodingDirection is derived from idir-acq-LR in the filename. For LR its -i and for RL its i .

How can this be done using bash script preferably if not then in python.

Any help is appreciated.

Answer 1

You try below node js script

var fs = require('fs');

fs.readdir('.', function(err, files) {
    if (err) console.log(err);
    files.forEach(function(file) {
        var obj = {
            "TotalReadoutTime": 0.08346,

        };

        if (file.indexOf("idir-acq-LR") > -1) {
            console.log(file);
            obj.PhaseEncodingDirection = "-i";
            var intendedForPart1 =  file.replace(/'-EMOTION-acq-LR'/g,'-rest_acq-LR');
            var intendedForPart2 =  intendedForPart1.replace(/'_epi.json'/g,'_run-01_bold.nii.gz');
            obj.IntendedFor = 'func/' + intendedForPart2;
            fs.writeFile(file, JSON.stringify(obj), 'utf-8');
        } else if (file.indexOf("idir-acq-RL") > -1) {
            console.log(file);
            obj.PhaseEncodingDirection = "i";
            var intendedForPart1 =  file.replace(/'-EMOTION-acq-RL'/g,'-rest_acq-RL');
            var intendedForPart2 =  intendedForPart1.replace(/'_epi.json'/g,'_run-01_bold.nii.gz');
            obj.IntendedFor = 'func/' + intendedForPart2;
            //obj.IntendedFor = "func/sub-285345_task-rest_acq-RL_run-01_bold.nii.gz"
            fs.writeFile(file, JSON.stringify(obj), 'utf-8');
        }

    });
});