76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
use nix::unistd::Pid;
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use crate::{jobs::{ChildProc, JobBldr}, libsh::error::ShResult, parse::{execute::prepare_argv, lex::{Span, Tk}, Redir}, procio::{IoFrame, IoStack}};
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pub mod echo;
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pub mod cd;
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pub mod export;
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pub mod pwd;
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pub mod source;
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pub mod shift;
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pub mod jobctl;
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pub const BUILTINS: [&str;9] = [
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"echo",
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"cd",
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"export",
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"pwd",
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"source",
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"shift",
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"jobs",
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"fg",
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"bg"
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];
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/// Sets up a builtin command
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///
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/// Prepares a builtin for execution by processing arguments, setting up redirections, and registering the command as a child process in the given `JobBldr`
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///
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/// # Parameters
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/// * argv - The vector of raw argument tokens
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/// * job - A mutable reference to a `JobBldr`
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/// * io_mode - An optional 2-tuple consisting of a mutable reference to an `IoStack` and a vector of `Redirs`
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///
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/// # Behavior
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/// * Cleans, expands, and word splits the arg vector
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/// * Adds a new `ChildProc` to the job builder
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/// * Performs redirections, if any.
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///
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/// # Returns
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/// * The processed arg vector
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/// * The popped `IoFrame`, if any
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///
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/// # Notes
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/// * If redirections are given to this function, the caller must call `IoFrame.restore()` on the returned `IoFrame`
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/// * If redirections are given, the second field of the resulting tuple will *always* be `Some()`
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/// * If no redirections are given, the second field will *always* be `None`
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pub fn setup_builtin(
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argv: Vec<Tk>,
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job: &mut JobBldr,
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io_mode: Option<(&mut IoStack,Vec<Redir>)>,
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) -> ShResult<(Vec<(String,Span)>, Option<IoFrame>)> {
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let mut argv: Vec<(String,Span)> = prepare_argv(argv);
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let child_pgid = if let Some(pgid) = job.pgid() {
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pgid
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} else {
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job.set_pgid(Pid::this());
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Pid::this()
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};
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let cmd_name = argv.remove(0).0;
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let child = ChildProc::new(Pid::this(), Some(&cmd_name), Some(child_pgid))?;
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job.push_child(child);
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let io_frame = if let Some((io_stack,redirs)) = io_mode {
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io_stack.append_to_frame(redirs);
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let mut io_frame = io_stack.pop_frame();
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io_frame.redirect()?;
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Some(io_frame)
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} else {
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None
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};
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// We return the io_frame because the caller needs to also call io_frame.restore()
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Ok((argv,io_frame))
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}
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