76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
// preload.js for Electron app
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const { ipcRenderer } = require('electron');
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const fs = require('fs');
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const modpath = require('path');
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function isProbablyBinary(path, data) {
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var score = 0;
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// decode as UTF-8
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for (var i = 0; i < (data?data.length:0);) {
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let c = data[i++];
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if ((c & 0x80) == 0) {
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// more likely binary if we see a NUL or obscure control character
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if (c < 9 || (c >= 14 && c < 26) || c == 0x7f) {
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score++;
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break;
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}
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} else {
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// look for invalid unicode sequences
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var nextra = 0;
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if ((c & 0xe0) == 0xc0) nextra = 1;
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else if ((c & 0xf0) == 0xe0) nextra = 2;
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else if ((c & 0xf8) == 0xf0) nextra = 3;
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else if (c < 0xa0) score++;
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else if (c == 0xff) score++;
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while (nextra--) {
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if (i >= data.length || (data[i++] & 0xc0) != 0x80) {
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score++;
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break;
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}
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}
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}
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}
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return score > 0;
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}
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process.once('loaded', () => {
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// workspace root path
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// reload() clears this, so we have to set it every time
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var wsroot;
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// from browser: read workspace file synchronously
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window.getWorkspaceFile = function(path, filetype) {
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if (wsroot == null) throw Error("no workspace root set");
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try {
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var fullpath = modpath.join(wsroot, modpath.normalize(path));
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var data = fs.readFileSync(fullpath); // read binary
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var buf = new Uint8Array(data); // convert to array
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var isBinary = filetype != 'text' || isProbablyBinary(path, buf);
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data = isBinary ? buf : data.toString('utf-8');
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console.log("getWorkspaceFile", path, isBinary, data.length);
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return data;
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} catch (e) {
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console.log(e);
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return null;
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}
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}
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// from browser: put workspace file
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window.putWorkspaceFile = function(path, data) {
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if (wsroot == null) throw Error("no workspace root set");
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var fullpath = modpath.join(wsroot, modpath.normalize(path));
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var encoding = typeof data === 'string' ? 'utf8' : null;
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fs.writeFileSync(fullpath, data, {encoding:encoding});
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}
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// from electron.js: set workspace root directory
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ipcRenderer.on('setWorkspaceRoot', (event, data) => {
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wsroot = data.root;
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var binpath = modpath.join(wsroot, 'bin');
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if (!fs.existsSync(binpath)) fs.mkdirSync(binpath, {});
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console.log('setWorkspaceRoot', wsroot);
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});
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// from electron.js: file changed
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ipcRenderer.on('fileChanged', (event, data) => {
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var path = data.path;
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window.reloadWorkspaceFile(path);
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});
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});
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