Re-implemented more job control logic

src/builtin/jobctl.rs

@@ -0,0 +1,205 @@
+use crate::{jobs::{ChildProc, JobBldr, JobCmdFlags, JobID}, libsh::error::{ErrSpan, ShErr, ShErrKind, ShResult}, parse::{execute::prepare_argv, lex::Span, NdRule, Node}, prelude::*, procio::{borrow_fd, IoStack}, state::{self, read_jobs, write_jobs}};
+
+pub enum JobBehavior {
+	Foregound,
+	Background
+}
+
+pub fn continue_job(node: Node, job: &mut JobBldr, behavior: JobBehavior) -> ShResult<()> {
+	let blame = ErrSpan::from(node.get_span());
+	let cmd = match behavior {
+		JobBehavior::Foregound => "fg",
+		JobBehavior::Background => "bg"
+	};
+	let NdRule::Command { assignments, argv } = node.class else {
+		unreachable!()
+	};
+
+	let child_pgid = if let Some(pgid) = job.pgid() {
+		pgid
+	} else {
+		job.set_pgid(Pid::this());
+		Pid::this()
+	};
+	let child = ChildProc::new(Pid::this(), Some(cmd), Some(child_pgid))?;
+	job.push_child(child);
+
+	let mut argv = prepare_argv(argv)
+		.into_iter()
+		.skip(1);
+
+	if read_jobs(|j| j.get_fg().is_some()) {
+		return Err(
+			ShErr::full(
+				ShErrKind::InternalErr,
+				format!("Somehow called '{}' with an existing foreground job",cmd),
+				blame
+			)
+		)
+	}
+
+	let curr_job_id = if let Some(id) = read_jobs(|j| j.curr_job()) {
+		id
+	} else {
+		return Err(
+			ShErr::full(
+				ShErrKind::ExecFail,
+				"No jobs found",
+				blame
+			)
+		)
+	};
+
+	let tabid = match argv.next() {
+		Some((arg,blame)) => parse_job_id(&arg, blame)?,
+		None => curr_job_id
+	};
+
+	let mut job = write_jobs(|j| {
+		let id = JobID::TableID(tabid);
+		let query_result = j.query(id.clone());
+		if query_result.is_some() {
+			Ok(j.remove_job(id.clone()).unwrap())
+		} else {
+			Err(
+				ShErr::full(
+					ShErrKind::ExecFail,
+					format!("Job id `{}' not found", tabid),
+					blame
+				)
+			)
+		}
+	})?;
+
+	job.killpg(Signal::SIGCONT)?;
+
+	match behavior {
+		JobBehavior::Foregound => {
+			write_jobs(|j| j.new_fg(job))?;
+		}
+		JobBehavior::Background => {
+			let job_order = read_jobs(|j| j.order().to_vec());
+			write(borrow_fd(1), job.display(&job_order, JobCmdFlags::PIDS).as_bytes())?;
+			write_jobs(|j| j.insert_job(job, true))?;
+		}
+	}
+	state::set_status(0);
+	Ok(())
+}
+
+fn parse_job_id(arg: &str, blame: Span) -> ShResult<usize> {
+	if arg.starts_with('%') {
+		let arg = arg.strip_prefix('%').unwrap();
+		if arg.chars().all(|ch| ch.is_ascii_digit()) {
+			Ok(arg.parse::<usize>().unwrap())
+		} else {
+			let result = write_jobs(|j| {
+				let query_result = j.query(JobID::Command(arg.into()));
+				query_result.map(|job| job.tabid().unwrap())
+			});
+			match result {
+				Some(id) => Ok(id),
+				None => Err(
+					ShErr::full(
+						ShErrKind::InternalErr,
+						"Found a job but no table id in parse_job_id()",
+						blame.into()
+					)
+				)
+			}
+		}
+	} else if arg.chars().all(|ch| ch.is_ascii_digit()) {
+		let result = write_jobs(|j| {
+			let pgid_query_result = j.query(JobID::Pgid(Pid::from_raw(arg.parse::<i32>().unwrap())));
+			if let Some(job) = pgid_query_result {
+				return Some(job.tabid().unwrap())
+			}
+
+			if arg.parse::<i32>().unwrap() > 0 {
+				let table_id_query_result = j.query(JobID::TableID(arg.parse::<usize>().unwrap()));
+				return table_id_query_result.map(|job| job.tabid().unwrap());
+			}
+
+			None
+		});
+
+		match result {
+			Some(id) => Ok(id),
+			None => Err(
+				ShErr::full(
+					ShErrKind::InternalErr,
+					"Found a job but no table id in parse_job_id()",
+					blame.into()
+				)
+			)
+		}
+	} else {
+		Err(
+			ShErr::full(
+				ShErrKind::SyntaxErr,
+				format!("Invalid fd arg: {}", arg),
+				blame.into()
+			)
+		)
+	}
+}
+
+pub fn jobs(node: Node, io_stack: &mut IoStack, job: &mut JobBldr) -> ShResult<()> {
+	let NdRule::Command { assignments, argv } = node.class else {
+		unreachable!()
+	};
+
+	let child_pgid = if let Some(pgid) = job.pgid() {
+		pgid
+	} else {
+		job.set_pgid(Pid::this());
+		Pid::this()
+	};
+	let child = ChildProc::new(Pid::this(), Some("jobs"), Some(child_pgid))?;
+	job.push_child(child);
+
+	let mut argv = prepare_argv(argv)
+		.into_iter()
+		.skip(1);
+
+	let mut io_frame = io_stack.pop_frame();
+	io_frame.redirect()?;
+
+	let mut flags = JobCmdFlags::empty();
+	while let Some((arg,span)) = argv.next() {
+		let mut chars = arg.chars().peekable();
+		if chars.peek().is_none_or(|ch| *ch != '-') {
+			return Err(
+				ShErr::full(
+					ShErrKind::SyntaxErr,
+					"Invalid flag in jobs call",
+					span.into()
+				)
+			)
+		}
+		chars.next();
+		while let Some(ch) = chars.next() {
+			let flag = match ch {
+				'l' => JobCmdFlags::LONG,
+				'p' => JobCmdFlags::PIDS,
+				'n' => JobCmdFlags::NEW_ONLY,
+				'r' => JobCmdFlags::RUNNING,
+				's' => JobCmdFlags::STOPPED,
+				_ => return Err(
+					ShErr::full(
+						ShErrKind::SyntaxErr,
+						"Invalid flag in jobs call",
+						span.into()
+					)
+				)
+
+			};
+			flags |= flag
+		}
+	}
+	write_jobs(|j| j.print_jobs(flags))?;
+	io_frame.restore()?;
+	state::set_status(0);
+
+	Ok(())
+}

src/builtin/mod.rs

@@ -4,12 +4,16 @@ pub mod export;
 pub mod pwd;
 pub mod source;
 pub mod shift;
+pub mod jobctl;
 
-pub const BUILTINS: [&str;6] = [
+pub const BUILTINS: [&str;9] = [
 	"echo",
 	"cd",
 	"export",
 	"pwd",
 	"source",
-	"shift"
+	"shift",
+	"jobs",
+	"fg",
+	"bg"
 ];