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import h from 'hyperscript';
import FileSaver from 'file-saver';
import * as u from 'opcut/util';
import * as ev from 'opcut/ev';
export function loadText(ext) {
const el = h('input', {
style: 'display: none',
type: 'file',
accept: ext});
const promise = new Promise(resolve => {
ev.on(el, 'change', evt => {
const file = u.get(['files', 0], evt.target);
if (!file)
return;
const fileReader = new FileReader();
fileReader.onload = () => {
const data = fileReader.result;
resolve(data);
};
fileReader.readAsText(file);
});
el.click();
});
return promise;
}
export function saveText(text, fileName) {
const blob = stringToBlob(text);
FileSaver.saveAs(blob, fileName);
}
export function saveB64Data(b64Data, fileName) {
const blob = b64ToBlob(b64Data);
FileSaver.saveAs(blob, fileName);
}
function stringToBlob(strData, contentType) {
contentType = contentType || '';
return new Blob([strData], {type: contentType});
}
// http://stackoverflow.com/a/16245768
function b64ToBlob(b64Data, contentType, sliceSize) {
contentType = contentType || '';
sliceSize = sliceSize || 512;
var byteCharacters = atob(b64Data);
var byteArrays = [];
for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
var slice = byteCharacters.slice(offset, offset + sliceSize);
var byteNumbers = new Array(slice.length);
for (var i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}
var byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
}
var blob = new Blob(byteArrays, {type: contentType});
return blob;
}
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