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import _ from 'underscore';
import $ from 'jquery';
import { Terminal } from 'xterm';
import * as fit from 'xterm/lib/addons/fit/fit';
import { canScrollUp, canScrollDown } from '~/lib/utils/dom_utils';
const SCROLL_MARGIN = 5;
Terminal.applyAddon(fit);
export default class GLTerminal {
constructor(element, options = {}) {
this.options = Object.assign(
{},
{
cursorBlink: true,
screenKeys: true,
},
options,
);
this.container = element;
this.onDispose = [];
this.setSocketUrl();
this.createTerminal();
$(window)
.off('resize.terminal')
.on('resize.terminal', () => {
this.terminal.fit();
});
}
setSocketUrl() {
const { protocol, hostname, port } = window.location;
const wsProtocol = protocol === 'https:' ? 'wss://' : 'ws://';
const path = this.container.dataset.projectPath;
this.socketUrl = `${wsProtocol}${hostname}:${port}${path}`;
}
createTerminal() {
this.terminal = new Terminal(this.options);
this.socket = new WebSocket(this.socketUrl, ['terminal.gitlab.com']);
this.socket.binaryType = 'arraybuffer';
this.terminal.open(this.container);
this.terminal.fit();
this.terminal.focus();
this.socket.onopen = () => {
this.runTerminal();
};
this.socket.onerror = () => {
this.handleSocketFailure();
};
}
runTerminal() {
const decoder = new TextDecoder('utf-8');
const encoder = new TextEncoder('utf-8');
this.terminal.on('data', data => {
this.socket.send(encoder.encode(data));
});
this.socket.addEventListener('message', ev => {
this.terminal.write(decoder.decode(ev.data));
});
this.isTerminalInitialized = true;
this.terminal.fit();
}
handleSocketFailure() {
this.terminal.write('\r\nConnection failure');
}
addScrollListener(onScrollLimit) {
const viewport = this.container.querySelector('.xterm-viewport');
const listener = _.throttle(() => {
onScrollLimit({
canScrollUp: canScrollUp(viewport, SCROLL_MARGIN),
canScrollDown: canScrollDown(viewport, SCROLL_MARGIN),
});
});
this.onDispose.push(() => viewport.removeEventListener('scroll', listener));
viewport.addEventListener('scroll', listener);
// don't forget to initialize value before scroll!
listener({ target: viewport });
}
disable() {
this.terminal.setOption('cursorBlink', false);
this.terminal.setOption('theme', { foreground: '#707070' });
this.terminal.setOption('disableStdin', true);
this.socket.close();
}
dispose() {
this.terminal.off('data');
this.terminal.dispose();
this.socket.close();
this.onDispose.forEach(fn => fn());
this.onDispose.length = 0;
}
scrollToTop() {
this.terminal.scrollToTop();
}
scrollToBottom() {
this.terminal.scrollToBottom();
}
fit() {
this.terminal.fit();
}
}
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