fix: allow negative values in min and max arguments

src/app.rs

@@ -24,6 +24,7 @@ fn add_min_max(app: App) -> App {
         Arg::new("max")
             .long("max")
             .short('M')
+            .allow_hyphen_values(true)
             .about("Filter out values bigger than this")
             .takes_value(true),
     )
@@ -31,6 +32,7 @@ fn add_min_max(app: App) -> App {
         Arg::new("min")
             .long("min")
             .short('m')
+            .allow_hyphen_values(true)
             .about("Filter out values smaller than this")
             .takes_value(true),
     )

tests/integration_tests.rs

@@ -166,3 +166,19 @@ fn test_plot() {
         Err(_) => assert!(false, "Could not create temp file"),
     }
 }
+
+#[test]
+fn test_hist_negative_min() {
+    let mut cmd = Command::cargo_bin("lowcharts").unwrap();
+    cmd.arg("hist")
+        .arg("--min")
+        .arg("-1")
+        .arg("--max")
+        .arg("10.1")
+        .write_stdin("4.2\n2.4\n-2\n")
+        .assert()
+        .success()
+        .stdout(predicate::str::contains(
+            "Samples = 2; Min = 2.4; Max = 4.2",
+        ));
+}