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use std::collections::HashMap;
use std::process::Command;
use std::io;
#[derive(Debug, PartialEq, Eq)]
pub struct Unit {
pub name: String,
pub type_: String
}
pub fn parse_key_value(line: &str) -> Option<(String, String)> {
let pos = line.find('=');
pos.map(|pos| {
let (k, v) = line.split_at(pos);
(k.to_owned(), v[1..].to_owned())
})
}
#[test]
fn test_parse_key_value() {
assert_eq!(None, parse_key_value("ab"));
assert_eq!(Some(("a".to_owned(), "b".to_owned())), parse_key_value("a=b"));
assert_eq!(Some(("a".to_owned(), "b=c".to_owned())), parse_key_value("a=b=c"));
}
fn make_unit(info: HashMap<String, String>) -> Option<Unit> {
fn from_id(id: &str) -> Option<String> {
id.rsplit('.').next().map(|t| t.to_owned())
};
let id = info.get("Id").map(|id| id.clone());
let type_ = id.as_ref().and_then(|id| from_id(&id));
if let (Some(id), Some(type_)) = (id, type_) {
Some(Unit { name: id, type_: type_ })
} else {
None
}
}
#[test]
fn test_make_unit() {
let s = |s: &str| -> String { s.to_owned() };
let info = [(s("Id"), s("Test.service"))]
.iter().cloned().collect::<HashMap<String, String>>();
assert_eq!(Some(Unit { name: s("Test.service"), type_: s("service") }), make_unit(info));
let info = HashMap::new();
assert_eq!(None, make_unit(info));
}
pub fn get_units() -> io::Result<Vec<Unit>> {
let mut units = Vec::new();
let status = try!(Command::new("systemctl")
.args(&["show", "*"]).output());
let mut unit_info = HashMap::new();
for line in String::from_utf8_lossy(&status.stdout).split('\n') {
if let Some((k, v)) = parse_key_value(line) {
unit_info.insert(k, v);
} else {
make_unit(unit_info).map(|u| units.push(u));
unit_info = HashMap::new();
}
}
return Ok(units);
}
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