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/// Spawn a program
///
/// This macro provides a common interface for running system programs,
/// as well as built-in shell commands. This is possible, since the
/// shell's homebrew facilities for running built-ins mimic the
/// interface of [std::process::Command]. See
/// [crate::poem::anthology::Anthology] for the implementation details.
///
/// First, the macro sets the arguments for the command. Next, it
/// determines the whether or not text should be piped in/out of the
/// command. The process is spawned, then it determines what to do based
/// on the [crate::poem::elements::verse::Verse]'s meter (wait, fork to
/// background, or capture STDOUT). Finally, the macro performs any IO
/// functions (i.e. writing/appending STDOUT or STDERR to a file).
#[macro_export]
macro_rules! incant {
($verb:expr, $command:expr, $out:expr, $pids:expr, $env:expr, $self:expr) => {{
$command.args($self.clause().unwrap_or(vec![]));
// Determine couplet status
if $self.couplet == 1 {
// Verse is the left half of a couplet
$command.stdout(Stdio::piped());
} else if $self.couplet == 2 {
// Verse is the right half of a couplet
$command.stdin(Stdio::piped());
} else if $self.couplet == 3 {
// Verse is taking in and piping out output
$command.stdout(Stdio::piped());
$command.stdin(Stdio::piped());
}
// Setup for other IO
if $self.io.contains(&Rune::Write) || $self.io.contains(&Rune::Addendum) {
$command.stdout(Stdio::piped());
}
if $self.io.contains(&Rune::Write2) || $self.io.contains(&Rune::Addendum2) {
$command.stderr(Stdio::piped());
}
if $self.io.contains(&Rune::WriteAll) || $self.io.contains(&Rune::AddendumAll) {
$command.stdout(Stdio::piped());
$command.stderr(Stdio::piped());
}
// Capture stdout if (f)orce (c)apture is set
if $env.fc {
$command.stdout(Stdio::piped());
}
// Detach the process group, if in the [Rune::Quiet] meter
if $self.meter == Rune::Quiet {
$command.process_group(0);
}
// Spawn the process
let mut child = $command.fork($env)?;
// Pipe in command, if we're the right side of a couplet
if $self.couplet > 1 {
let stdin = child.stdin.as_mut().ok_or(io::ErrorKind::BrokenPipe)?;
stdin.write_all(&$out)?;
$out.clear();
}
// Determine what to do based on the meter
let mut output: Output;
let mut err: Vec<u8> = Vec::new();
match $self.meter {
Rune::None | Rune::And | Rune::Continue => {
output = child.wait_with_output()?;
if $self.io.contains(&Rune::Write) || $self.io.contains(&Rune::Addendum) {
$out.append(&mut output.stdout);
}
if $self.io.contains(&Rune::Write2) || $self.io.contains(&Rune::Addendum2) {
err.append(&mut output.stderr);
}
if $self.io.contains(&Rune::WriteAll) || $self.io.contains(&Rune::AddendumAll) {
$out.append(&mut output.stdout);
err.append(&mut output.stderr);
}
if $env.fc {
$out.append(&mut output.stdout);
}
}
Rune::Couplet => {
output = child.wait_with_output()?;
$out.append(&mut output.stdout);
if $self.io.contains(&Rune::Write2) || $self.io.contains(&Rune::Addendum2) {
err.append(&mut output.stderr);
}
if $self.io.contains(&Rune::WriteAll) || $self.io.contains(&Rune::AddendumAll) {
err.append(&mut output.stderr);
}
}
Rune::Quiet => {
println!("[&] {}", child.id());
$pids.lock().unwrap().push(child.id() as i32);
let stanza = $self.stanza.join(" ").to_string();
let pids = Arc::clone($pids);
unsafe {
signal_hook::low_level::register(signal_hook::consts::SIGCHLD, move || {
for pid in pids.lock().unwrap().iter() {
let mut pid = *pid;
let mut status: i32 = 0;
pid = waitpid(pid, &mut status, WNOHANG);
if pid > 0 {
print!("\n[&] + done {}", stanza);
io::stdout().flush().unwrap();
}
}
})
.unwrap();
}
return Ok(0);
}
_ => unreachable!(),
}
// Perform IO operations
let mut oi = 0;
let mut ei = 0;
$self.io.retain(|rune| *rune != Rune::Read);
for io in $self.io.iter() {
let (f, f2) = match *io {
Rune::Write => {
oi += 1;
(
Some(
OpenOptions::new()
.create(true)
.truncate(true)
.write(true)
.open(&$self.op[oi - 1])?,
),
None,
)
}
Rune::Write2 => {
ei += 1;
(
None,
Some(
OpenOptions::new()
.create(true)
.truncate(true)
.write(true)
.open(&$self.ep[ei - 1])?,
),
)
}
Rune::WriteAll => {
oi += 1;
ei += 1;
(
Some(
OpenOptions::new()
.create(true)
.truncate(true)
.write(true)
.open(&$self.op[oi - 1])?,
),
Some(
OpenOptions::new()
.create(true)
.truncate(true)
.write(true)
.open(&$self.ep[ei - 1])?,
),
)
}
Rune::Addendum => {
oi += 1;
(
Some(
OpenOptions::new()
.create(true)
.append(true)
.open(&$self.op[oi - 1])?,
),
None,
)
}
Rune::Addendum2 => {
ei += 1;
(
None,
Some(
OpenOptions::new()
.create(true)
.append(true)
.open(&$self.ep[ei - 1])?,
),
)
}
Rune::AddendumAll => {
oi += 1;
ei += 1;
(
Some(
OpenOptions::new()
.create(true)
.append(true)
.open(&$self.op[oi - 1])?,
),
Some(
OpenOptions::new()
.create(true)
.append(true)
.open(&$self.ep[ei - 1])?,
),
)
}
_ => unreachable!(),
};
match f {
Some(mut file) => file.write($out)?,
None => 0,
};
match f2 {
Some(mut file) => file.write(&err)?,
None => 0,
};
}
if !output.status.success() {
return Ok(output.status.code().unwrap_or(-1));
}
err.clear();
if $self.meter != Rune::Couplet && $env.fc != true {
$out.clear();
}
Ok(output.status.code().unwrap_or(0))
}};
}
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