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runner.ts
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runner.ts
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import { ProcessStatus, Closer, Process } from "deno";
import * as deno from "deno";
import {
watch,
Options as WatchOptions
} from "https://deno.land/x/watch@1.2.0/mod.ts";
import * as path from "https://deno.land/x/fs/path.ts"; // should fix later
type Tasks = { [name: string]: Command };
interface ResolveContext {
checked: Set<string>;
hasWatcher: boolean;
}
class ProcessError extends Error {
constructor(
public pid: number,
public rid: number,
public status: ProcessStatus,
public taskName?: string
) {
super("Process exited with status code " + status.code);
}
}
interface Command {
resolveRef(tasks: Tasks, context: ResolveContext): Command;
run(args: string[], context: RunContext): Promise<void>;
}
class Single implements Command {
constructor(public script: string) {}
resolveRef(tasks: Tasks, _: ResolveContext) {
return this;
}
async run(args: string[], { cwd, shell, resources }: RunContext) {
const allArgs = shell
? [...getShellCommand(), [this.script, ...args].join(" ")]
: [...this.script.split(/\s/), ...args];
const p = deno.run({
args: allArgs,
cwd: cwd,
stdout: "inherit",
stderr: "inherit"
});
const closer = {
close() {
kill(p);
}
};
resources.add(closer);
const status = await p.status();
p.close();
resources.delete(closer);
if (!status.success) {
throw new ProcessError(p.pid, p.rid, status);
}
}
}
function getShellCommand(): string[] {
let env = deno.env();
if (deno.platform.os === "win") {
return [env.COMSPEC || "cmd.exe", "/D", "/C"];
} else {
return [env.SHELL || "/bin/sh", "-c"];
}
}
async function kill(p: Process) {
const k = deno.run({
args: ["kill", `${p.pid}`],
stdout: "inherit",
stderr: "inherit"
});
await k.status();
k.close();
}
class Ref implements Command {
constructor(public script: string) {}
resolveRef(tasks: Tasks, context: ResolveContext) {
const splitted = this.script.split(/\s/);
const name = splitted[0].slice(1);
const args = splitted.slice(1);
if (!name.length) {
throw new Error("Task name should not be empty.");
}
let command = tasks[name];
if (!command) {
throw new Error(`Task "${name}" is not defined.`);
}
if (context.checked.has(name)) {
throw new Error(`Task "${name}" is in a reference loop.`);
}
if (command instanceof Single) {
command = new Single([command.script, ...args].join(" "));
}
return command.resolveRef(tasks, {
...context,
checked: new Set(context.checked).add(name)
});
}
async run(args: string[], context: RunContext) {
throw new Error("Ref should be resolved before running.");
}
}
class Sequence implements Command {
commands: Command[];
constructor(commands: Command[]) {
this.commands = commands;
}
resolveRef(tasks: Tasks, context: ResolveContext) {
return new Sequence(
this.commands.map(c => {
return c.resolveRef(tasks, context);
})
);
}
async run(args: string[], context: RunContext) {
if (args.length) {
throw new Error("Cannot pass args to sequential tasks.");
}
for (let command of this.commands) {
await command.run([], context);
}
}
}
class Parallel implements Command {
commands: Command[];
constructor(commands: Command[]) {
this.commands = commands;
}
resolveRef(tasks: Tasks, context: ResolveContext) {
return new Parallel(
this.commands.map(c => {
return c.resolveRef(tasks, context);
})
);
}
async run(args: string[], context: RunContext) {
if (args.length) {
throw new Error("Cannot pass args to parallel tasks.");
}
await Promise.all(this.commands.map(c => c.run([], context)));
}
}
class SyncWatcher implements Command {
constructor(
public dirs: string[],
public watchOptions: WatchOptions,
public command: Command
) {}
resolveRef(tasks: Tasks, context: ResolveContext) {
if (context.hasWatcher) {
throw new Error("Nested watchers not supported.");
}
return new SyncWatcher(
this.dirs,
this.watchOptions,
this.command.resolveRef(tasks, { ...context, hasWatcher: true })
);
}
async run(args: string[], context: RunContext) {
const dirs_ = this.dirs.map(d => {
return path.join(context.cwd, d);
});
const childResources = new Set();
await this.command
.run(args, { ...context, resources: childResources })
.catch(_ => {});
for await (const _ of watch(dirs_, this.watchOptions)) {
closeResouces(childResources);
await this.command
.run(args, { ...context, resources: childResources })
.catch(_ => {});
}
}
}
class AsyncWatcher implements Command {
constructor(
public dirs: string[],
public watchOptions: WatchOptions,
public command: Command
) {}
resolveRef(tasks: Tasks, context: ResolveContext) {
if (context.hasWatcher) {
throw new Error("Nested watchers not supported.");
}
return new AsyncWatcher(
this.dirs,
this.watchOptions,
this.command.resolveRef(tasks, { ...context, hasWatcher: true })
);
}
async run(args: string[], context: RunContext) {
const dirs_ = this.dirs.map(d => {
return path.join(context.cwd, d);
});
const childResources = new Set();
const closer = {
close() {
throw new Error("Nested watchers not supported.");
}
};
context.resources.add(closer);
this.command
.run(args, { ...context, resources: childResources })
.catch(_ => {});
for await (const _ of watch(dirs_, this.watchOptions)) {
closeResouces(childResources);
this.command
.run(args, { ...context, resources: childResources })
.catch(_ => {});
}
context.resources.delete(closer);
}
}
function closeResouces(resources: Set<Closer>) {
for (let resource of resources) {
resource.close();
}
resources.clear();
}
export class TaskDecorator {
constructor(public tasks: Tasks, public name: string) {}
watchSync(dirs: string | string[], watchOptions = {}) {
if (typeof dirs === "string") {
dirs = [dirs];
}
this.tasks[this.name] = new SyncWatcher(
dirs,
watchOptions,
this.tasks[this.name]
);
}
watch(dirs: string | string[], watchOptions = {}) {
if (typeof dirs === "string") {
dirs = [dirs];
}
this.tasks[this.name] = new AsyncWatcher(
dirs,
watchOptions,
this.tasks[this.name]
);
}
}
interface RunOptions {
cwd?: string;
shell?: boolean;
}
interface RunContext {
cwd: string;
shell: boolean;
resources: Set<Closer>;
}
export class TaskRunner {
tasks: Tasks = {};
task(name: string, ...rawCommands: (string | string[])[]): TaskDecorator {
if (name.split(/\s/).length > 1) {
throw new Error(`Task name "${name}" is invalid.`);
}
if (this.tasks[name]) {
throw new Error(`Task name "${name}" is duplicated.`);
}
this.tasks[name] = makeCommand(rawCommands);
return new TaskDecorator(this.tasks, name);
}
async run(taskName: string, args: string[] = [], options: RunOptions = {}) {
options = { cwd: ".", shell: true, ...options };
let command = this.tasks[taskName];
if (!command) {
throw new Error(`Task "${taskName}" not found.`);
}
const resolveContext = { checked: new Set(), hasWatcher: false };
const context = {
cwd: options.cwd,
shell: options.shell,
resources: new Set()
};
const resolvedCommand = command.resolveRef(this.tasks, resolveContext);
await resolvedCommand.run(args, context);
}
}
function makeCommand(rawCommands: (string | string[])[]): Command {
if (rawCommands.length === 0) {
throw new Error("Task needs at least one command.");
}
if (rawCommands.length === 1) {
return makeNonSequenceCommand(rawCommands[0]);
}
return new Sequence(rawCommands.map(makeNonSequenceCommand));
}
function makeNonSequenceCommand(rawCommand: string | string[]): Command {
if (typeof rawCommand === "string") {
return makeSingleCommand(rawCommand);
}
return new Parallel(rawCommand.map(makeSingleCommand));
}
function makeSingleCommand(script: string) {
script = script.trim();
if (!script.trim()) {
throw new Error("Command should not be empty.");
}
if (script.charAt(0) === "$") {
return new Ref(script);
}
return new Single(script);
}