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tsort: Switch to BTreeHash and BTreeSet

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Using HashMap and HashSet give a valid topological sort, but the output
will change randomly at each run.

BTree based structures will guarantee that the output is always ordered
in the same way.

This also makes the ouptut similar to the output of the C version of the
tools, on which some applications rely.
This commit is contained in:
Detlev Casanova 2023-06-02 14:42:47 -04:00
parent 82f5fec688
commit b070506255
1 changed files with 4 additions and 4 deletions
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8
src/uu/tsort/src/tsort.rs
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@ -6,7 +6,7 @@
// * For the full copyright and license information, please view the LICENSE
// * file that was distributed with this source code.
use clap::{crate_version, Arg, Command};
use std::collections::{HashMap, HashSet};
use std::collections::{BTreeMap, BTreeSet};
use std::fs::File;
use std::io::{stdin, BufRead, BufReader, Read};
use std::path::Path;
@ -103,8 +103,8 @@ pub fn uu_app() -> Command {
// but using integer may improve performance.
#[derive(Default)]
struct Graph {
in_edges: HashMap<String, HashSet<String>>,
out_edges: HashMap<String, Vec<String>>,
in_edges: BTreeMap<String, BTreeSet<String>>,
out_edges: BTreeMap<String, Vec<String>>,
result: Vec<String>,
}
@ -122,7 +122,7 @@ impl Graph {
}
fn init_node(&mut self, n: &str) {
self.in_edges.insert(n.to_string(), HashSet::new());
self.in_edges.insert(n.to_string(), BTreeSet::new());
self.out_edges.insert(n.to_string(), vec![]);
}