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use crate::poem::{read::Readable, recite::Reciteable, Poem};
pub mod environment;
pub use environment::Environment;
use std::env;
use std::fs;
use std::path::PathBuf;
/// Setup the global shell environment
///
/// Sets up the shell's environment via configuration files. In order:
/// * `/etc/dwvshrc`
/// * `~/.dwvshrc`
///
/// For debug builds, all files will instead be sourced from
/// `./dist/...` with the exception of `~/.dwvshrc`.
pub fn env() -> Environment {
// Create a new Environment object, to store some extra shell info
let mut env = Environment::new();
// Use local repo path if running the debug target
let global_rc = if cfg!(debug_assertions) {
let mut base = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
base.push("dist/etc/dwvshrc");
base
} else {
PathBuf::from("/etc/dwvshrc")
};
// User defined rc file in ~
let local_rc = match env::var("HOME") {
Ok(val) => {
let mut rc = PathBuf::from(val);
rc.push(".dwvshrc");
rc
}
Err(_) => {
eprintln!("dwvsh: unknown home, falling back to /etc");
PathBuf::from(&global_rc)
}
};
// Read, read, and recite
rrr(global_rc, &mut env);
rrr(local_rc, &mut env);
// Return the new environment
env
}
/// Read, read, and recite
///
/// Small, reusable function used to do the heavy lifting in regards to
/// sourcing configuration files. [Read][fs::read_to_string]s a file
/// from disk, then [read][crate::poem::read]s (parses) a [Poem],
/// then [recite][crate::poem::recite]s that [Poem].
/// Configuration files are just shell scripts.
fn rrr(path: PathBuf, env: &mut Environment) {
let poetry = match fs::read_to_string(&path) {
Ok(poetry) => poetry,
Err(e) => {
if path.to_string_lossy().contains("etc/dwvshrc") {
eprintln!(
"dwvsh: unable to read global dwvshrc file: {}",
e.to_string().to_lowercase()
);
}
return;
}
};
let poem = match Poem::read(poetry, &mut Environment::new()) {
Ok(poem) => poem,
Err(e) => {
eprintln!(
"dwvsh: error in {}: {}",
path.display(),
e.to_string().to_lowercase()
);
return;
}
};
match poem.recite(env) {
Ok(_) => {}
Err(e) => {
eprintln!("dwvsh: {}", e.to_string().to_lowercase());
return;
}
}
}
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