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import {ISiExternalApplication} from './ISiExternalApplication';
export interface ShellUserInterface {
getChar: () => number|undefined;
putChar: (char: number) => void;
}
export interface ShellCommand {
autocomplete: (args: string[]) => string[];
validateArgs: (context: ShellCommandContext) => boolean;
run: (context: ShellCommandContext) => Promise<void>;
printUsage: (context: ShellCommandContext) => void;
}
export interface ShellCommandContext {
args: string[];
getChar: () => number|undefined;
waitChar: () => Promise<number>;
putChar: (char: number) => void;
getLine: () => Promise<string>;
putString: (line: string) => void;
env: ShellEnv;
}
export interface AllShellOptions {
prompt: string;
initialEnv: ShellEnv;
}
export interface ShellOptions {
prompt?: string;
initialEnv?: ShellEnv;
}
type ShellEnv = {[varName: string]: unknown}&{
externalApplication?: {new(url: string): ISiExternalApplication},
device?: ISiDevice<ISiDeviceDriverData<unknown>>,
};
type ShellInputParser<T> = (
contentSoFar: T,
newChar: number,
ui: ShellUserInterface,
) => [boolean, T];
export class Shell {
private env: ShellEnv;
private options: AllShellOptions;
constructor(
public ui: ShellUserInterface,
private commands: {[commandName: string]: ShellCommand},
options: ShellOptions = {},
) {
this.options = {
initialEnv: {},
prompt: '$ ',
...options,
};
this.env = {...options.initialEnv};
}
run(): Promise<unknown> {
const promptForNewCommand = () => {
this.putString(this.options.prompt);
return this.getLine(this.autocompleteCommand.bind(this));
};
const loop = (commandStr: string): Promise<string> => {
Iif (commandStr === 'exit') {
return Promise.resolve('');
}
const args = commandStr.split(/\s+/);
const command = this.commands[args[0]];
if (command) {
const isValid = command.validateArgs(this.getCommandContext(args));
if (isValid) {
return command.run(this.getCommandContext(args))
.catch(() => undefined)
.then(() => promptForNewCommand())
.then(loop);
}
command.printUsage(this.getCommandContext(args));
} else E{
this.putString(`Unknown command: ${args[0]}\n`);
const availableCommands = Object.keys(this.commands).join(', ');
this.putString(`Available commands: ${availableCommands}\n`);
}
return promptForNewCommand().then(loop);
};
return promptForNewCommand().then(loop);
}
getCommandContext(args: string[]): ShellCommandContext {
return {
args: args,
getChar: this.ui.getChar,
waitChar: () => this.waitChar(),
putChar: this.ui.putChar,
getLine: () => this.getLine(),
putString: (str: string) => this.putString(str),
env: this.env,
};
}
getLine(
autocomplete?: (commandStr: string) => [boolean, string],
): Promise<string> {
return this.parseInput(
(content: string, nextChar: number, ui: ShellUserInterface) => {
if (nextChar === 13 || nextChar === 10) { // Enter
ui.putChar(nextChar);
return [true, content];
}
Iif (nextChar === 27 || nextChar === 3) { // Escape / Ctrl-C
return [true, 'exit'];
}
Iif (nextChar === 9 && autocomplete !== undefined) { // Tab
return autocomplete(content);
}
Iif (nextChar === 8) { // Backspace
ui.putChar(nextChar);
return [false, content.substr(0, content.length - 1)];
}
const newContent = `${content}${String.fromCharCode(nextChar)}`;
this.ui.putChar(nextChar);
return [false, newContent];
},
() => '',
);
}
autocompleteCommand(commandStr: string): [boolean, string] {
const args = commandStr.split(/\s+/);
Iif (args.length === 1) {
const options = this.autocompleteCommandName(args[0]);
Iif (options.length === 1) {
const newContent = options[0];
const rest = newContent.substr(commandStr.length);
[...rest].forEach((char) => {
this.ui.putChar(char.charCodeAt(0));
});
return [false, newContent];
}
}
Iif (args.length > 1) {
const command = this.commands[args[0]];
Iif (command) {
const options = command.autocomplete(args.slice(1));
Iif (options.length === 1) {
const existingLastArg = args[args.length - 1];
const lengthToPreserve = commandStr.length - existingLastArg.length;
const newContent = `${commandStr.substr(0, lengthToPreserve)}${options[0]}`;
const rest = options[0].substr(existingLastArg.length);
[...rest].forEach((char) => {
this.ui.putChar(char.charCodeAt(0));
});
return [false, newContent];
}
}
}
return [false, commandStr];
}
autocompleteCommandName(arg: string): string[] {
return Object.keys(this.commands).filter(
(commandName) => commandName.substr(0, arg.length) === arg,
);
}
parseInput<T>(
parser: ShellInputParser<T>,
init: () => T,
): Promise<T> {
let content = init();
const loop = (nextChar: number): number|Promise<number> => {
const [shouldExit, newContent] = parser(content, nextChar, this.ui);
content = newContent;
if (shouldExit) {
return nextChar;
}
return this.waitChar().then(loop);
};
return this.waitChar().then(loop).then(() => content);
}
waitChar(): Promise<number> {
return new Promise((resolve) => {
const poll = () => {
const char = this.ui.getChar();
if (char) {
resolve(char);
} else {
setTimeout(poll, 10);
}
};
poll();
});
}
putString(strToPut: string): void {
[...strToPut].forEach((char: string) => {
this.ui.putChar(char.charCodeAt(0));
});
}
}
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