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use std::{ffi::OsStr, path::Path, process::Command};
use serde::Serialize;
use sysinfo::{get_current_pid, Process, System};
use thiserror::Error;
pub enum Shell {
Sh,
Bash,
Fish,
Zsh,
Xonsh,
Nu,
Unknown,
}
impl std::fmt::Display for Shell {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let shell = match self {
Shell::Bash => "bash",
Shell::Fish => "fish",
Shell::Zsh => "zsh",
Shell::Nu => "nu",
Shell::Xonsh => "xonsh",
Shell::Sh => "sh",
Shell::Unknown => "unknown",
};
write!(f, "{}", shell)
}
}
#[derive(Debug, Error, Serialize)]
pub enum ShellError {
#[error("shell not supported")]
NotSupported,
#[error("failed to execute shell command: {0}")]
ExecError(String),
}
impl Shell {
pub fn current() -> Shell {
let sys = System::new_all();
let process = sys
.process(get_current_pid().expect("Failed to get current PID"))
.expect("Process with current pid does not exist");
let parent = 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::from_string(shell.to_string())
}
/// Best-effort attempt to determine the default shell
/// This implementation will be different across different platforms
/// Caller should ensure to handle Shell::Unknown correctly
pub fn default_shell() -> Result<Shell, ShellError> {
let sys = System::name().unwrap_or("".to_string()).to_lowercase();
// TODO: Support Linux
// I'm pretty sure we can use /etc/passwd there, though there will probably be some issues
if sys.contains("darwin") {
// This works in my testing so far
let path = Shell::Sh.run_interactive([
"dscl localhost -read \"/Local/Default/Users/$USER\" shell | awk '{print $2}'",
])?;
let path = Path::new(path.trim());
let shell = path.file_name();
if shell.is_none() {
return Err(ShellError::NotSupported);
}
Ok(Shell::from_string(
shell.unwrap().to_string_lossy().to_string(),
))
} else {
Err(ShellError::NotSupported)
}
}
pub fn from_string(name: String) -> Shell {
match name.as_str() {
"bash" => Shell::Bash,
"fish" => Shell::Fish,
"zsh" => Shell::Zsh,
"xonsh" => Shell::Xonsh,
"nu" => Shell::Nu,
"sh" => Shell::Sh,
_ => Shell::Unknown,
}
}
/// 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 run_interactive<I, S>(&self, args: I) -> Result<String, ShellError>
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
let shell = self.to_string();
let output = Command::new(shell)
.arg("-ic")
.args(args)
.output()
.map_err(|e| ShellError::ExecError(e.to_string()))?;
Ok(String::from_utf8(output.stdout).unwrap())
}
}
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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