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//! Executable naming, search, image discovery, and materialization primitives.
//!
//! Callers name the *program* they want. Whether that program is a file called
//! `runpm` or `runpm.exe`, and where a sibling install lives relative to the
//! running image, is a host mechanic and is decided here.
pub use crate::{
executable_file_name as file_name,
executable_sibling_of_current_image as sibling_of_current_image, EXECUTABLE_EXTENSION,
};
#[cfg(test)]
mod tests {
use super::*;
/// The host decides the spelling; the caller never does.
///
/// Asserted against `EXECUTABLE_EXTENSION` rather than a hard-coded
/// `.exe`, so the test states the contract instead of restating one host's
/// answer -- the shape the caller sites used to have.
#[test]
fn file_name_applies_the_host_executable_extension() {
let named = file_name("running-process-daemon");
match EXECUTABLE_EXTENSION {
Some(extension) => {
assert_eq!(named, format!("running-process-daemon.{extension}"));
assert!(std::path::Path::new(&named).extension().is_some());
}
None => assert_eq!(named, "running-process-daemon"),
}
}
/// The running image is always a sibling of itself, under whatever
/// spelling this host uses -- which is the only claim that holds on every
/// host without assuming what else is installed.
#[test]
fn the_running_image_is_found_beside_itself() {
let current = std::env::current_exe().expect("current image");
let bare = current
.file_stem()
.expect("image stem")
.to_string_lossy()
.into_owned();
assert_eq!(sibling_of_current_image(&bare).as_deref(), Some(&*current));
}
/// A program that is not installed beside us is reported as absent rather
/// than as a path that does not exist.
#[test]
fn an_absent_sibling_is_none_not_a_missing_path() {
assert!(sibling_of_current_image("rp-no-such-sibling-program").is_none());
}
}