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use sysinfo::{get_current_pid, Process, System};
use thiserror::Error;
pub enum Shell {
Sh,
Bash,
Fish,
Zsh,
Xonsh,
Nu,
Unknown,
}
#[derive(Debug, Error)]
pub enum ShellError {
#[error("shell not supported")]
NotSupported,
#[error("failed to execute shell command: {0}")]
ExecError(String),
}
pub fn shell() -> Shell {
let name = shell_name(None);
match name.as_str() {
"bash" => Shell::Bash,
"fish" => Shell::Fish,
"zsh" => Shell::Zsh,
"xonsh" => Shell::Xonsh,
"nu" => Shell::Nu,
"sh" => Shell::Sh,
_ => Shell::Unknown,
}
}
impl Shell {
/// Returns true if the shell is posix-like
/// Note that while fish is not posix compliant, it behaves well enough for our current
/// featureset that this does not matter.
pub fn is_posixish(&self) -> bool {
matches!(self, Shell::Bash | Shell::Fish | Shell::Zsh)
}
}
pub fn shell_name(parent: Option<&Process>) -> String {
let sys = System::new_all();
let parent = if let Some(parent) = parent {
parent
} else {
let process = sys
.process(get_current_pid().expect("Failed to get current PID"))
.expect("Process with current pid does not exist");
sys.process(process.parent().expect("Atuin running with no parent!"))
.expect("Process with parent pid does not exist")
};
let shell = parent.name().trim().to_lowercase();
let shell = shell.strip_prefix('-').unwrap_or(&shell);
shell.to_string()
}
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