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83 lines
1.8 KiB
83 lines
1.8 KiB
/**
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* Base interface class other can inherits from
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*/
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var _ = require("lodash");
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var tty = require("../utils/tty");
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var readlineFacade = require("readline2");
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/**
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* Module exports
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*/
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module.exports = UI;
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/**
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* Constructor
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*/
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function UI( opt ) {
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// Instantiate the Readline interface
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// @Note: Don't reassign if already present (allow test to override the Stream)
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this.rl || (this.rl = readlineFacade.createInterface());
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this.rl.resume();
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this.onForceClose = this.onForceClose.bind(this);
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this.onKeypress = this.onKeypress.bind(this);
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// Make sure new prompt start on a newline when closing
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this.rl.on( "SIGINT", this.onForceClose );
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process.on( "exit", this.onForceClose );
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// Propagate keypress events directly on the readline
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process.stdin.addListener( "keypress", this.onKeypress );
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}
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_.extend( UI.prototype, tty );
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/**
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* Handle the ^C exit
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* @return {null}
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*/
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UI.prototype.onForceClose = function() {
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this.close();
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console.log("\n"); // Line return
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};
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/**
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* Close the interface and cleanup listeners
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*/
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UI.prototype.close = function() {
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// Remove events listeners
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this.rl.removeListener( "SIGINT", this.onForceClose );
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process.stdin.removeListener( "keypress", this.onKeypress );
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process.removeListener( "exit", this.onForceClose );
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// Restore prompt functionnalities
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this.rl.output.unmute();
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process.stdout.write("\x1B[?25h"); // show cursor
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// Close the readline
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this.rl.output.end();
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this.rl.pause();
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this.rl.close();
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this.rl = null;
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};
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/**
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* Handle and propagate keypress events
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*/
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UI.prototype.onKeypress = function( s, key ) {
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// Ignore `enter` key (readline `line` event is the only one we care for)
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if ( key && (key.name === "enter" || key.name === "return") ) return;
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if ( this.rl ) {
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this.rl.emit( "keypress", s, key );
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}
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};
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