Ability to chain tasks like deno-task-shell

[Hexagon]

Ability to chain processes using && and || just like https://github.com/denoland/deno_task_shell

Would allow for some cool solutions where only the last result of the chain affects restart strategies etc.

Example configuration where task 2 only runs if task1 fals
{
processes [
{
"id": "my-task-chain",
"cmd": ["deno","run","task1.ts","||","deno","run","task2.ts"],
"autostart": true
}
}
}

Thoughts?

Other uses for running all commands through a custom shell?

[Leokuma]

Not sure if possible, but what if we use dax as the default interpreter for every cmd? I guess it's just a wrapper around deno_task_shell. It even has a cross platform unset that could be used to filter env variables.

Sorry I've been so busy lately, but still following the project 👍.

[Hexagon]

I can make a try using dax, the code to run processes is only about 20 sloc 😃

pup/lib/core/runner.ts

Lines 80 to 103 in 6dbac5e

	const commander = new Deno.Command(
	this.processConfig.cmd[0],
	{
	args: this.processConfig.cmd.slice(1),
	cwd: this.processConfig.cwd,
	env: env,
	stdout: "piped",
	stderr: "piped",
	},
	)
	this.process = commander.spawn()
	this.process.ref()
	// Process started, report pid to callback and file
	runningCallback(this.process.pid)
	this.writePidFile()
	this.pipeToLogger("stdout", this.process.stdout)
	this.pipeToLogger("stderr", this.process.stderr)
	// Wait for process to stop and retrieve exit status
	const result = await this.process.status

@dsherret I'm working on a poc dax runner. Checking out the documentation of dax, a couple of (hopefully) quick questions pops up that would be great if you could have a look at 🙏 :

let child = $.raw`${commandString}`.stdout("piped").stderr("piped") <-
                          // Question 1. Is it possible to have a fully dynamic command string with 
                          // arguments, like ["deno run -A","/path/with spaces and/stuff",
                          // "&& echo","Hello world!"]

if (this.processConfig.cwd) child = child.cwd(this.processConfig.cwd)
if (env) child = child.env(env)
this.process = child.spawn()
this.process = child.spawn()
runningCallback(/*pid*/0) // <- Question 2: How to get the pid of the process, is it possible 
                          //    today, is it even relevant when running processes using a shell? 
                          //    Optimally i would want the pid of the currently executing process if many are chained
this.writePidFile()
this.pipeToLogger("stdout", this.process.stdout())
this.pipeToLogger("stderr", this.process.stderr())
const result = await this.process
// this.process.ref()     // <- Question 3: Is it possible to ref the child process to force it exit 
                          //    along with the parent using dax?

And the last question, are there any obvious reasons why i get "Pipe error" every now and then?

[Hexagon]

POC pushed to branch feature/dax-shell

Implemented in main and included in pup since 1.0.0-beta.23

pup/lib/core/runner.ts

Line 87 in 21fd1bd

let child = $.raw`${commandString}`.stdout("piped").stderr("piped")