def print_json(outfile, samp_freq, time_offset, ch_name):
"""
Print the json required by BIDS format.
Parameters
----------
outfile: str or path
Fullpath to output file.
samp_freq: float
Frequency of sampling for the output file.
time_offset: float
Difference between beginning of file and first TR.
ch_name: list of str
List of channel names, as specified by BIDS format.
Notes
-----
Outcome:
outfile: .json file
File containing information for BIDS.
"""
start_time = -time_offset
summary = dict(SamplingFrequency=samp_freq,
StartTime=round(start_time, 4),
Columns=ch_name)
utils.write_json(outfile, summary, indent=4, sort_keys=False)
def test_write_json(tmpdir):
test_json_filename = tmpdir.join('foo')
test_json_data = dict(SamplingFrequency=42,
StartTime='00:00 ET',
Columns='Rick')
utils.write_json(str(test_json_filename), test_json_data, indent=4, sort_keys=False)
test_json_filename += '.json'
assert os.path.isfile(test_json_filename)
with open(test_json_filename, 'r') as src:
loaded_data = json.load(src)
assert test_json_data == loaded_data
def dataset_description_file(outdir):
"""
Create dataset_description.json file if it does not exist.
If it exists, do nothing.
Parameters
----------
outdir: path
Full path to the output directory.
"""
# dictionary that will be written for the basic dataset description version
data_dict = {"Name": os.path.splitext(os.path.basename(outdir))[0],
"BIDSVersion": "1.4.0", "DatasetType": "raw"}
file_path = os.path.join(outdir, 'dataset_description.json')
# check if dataset_description.json exists, if it doesn't create it
if not os.path.exists(file_path):
LGR.warning('phys2bids could not find dataset_description.json,'
'generating it with provided info')
utils.write_json(file_path, data_dict)