fix: fixed unwanted wrapping of a single hyphen in quotes (#259)

Author: pamburus

Cargo.lock

@@ -4,7 +4,7 @@ members = [".", "crate/encstr"]
 [workspace.package]
 repository = "https://github.com/pamburus/hl"
 authors = ["Pavel Ivanov <mr.pavel.ivanov@gmail.com>"]
-version = "0.29.4-alpha.5"
+version = "0.29.4-alpha.6"
 edition = "2021"
 license = "MIT"
 

Cargo.toml

@@ -1283,6 +1283,21 @@ mod tests {
         assert_eq!(format_no_color(&rec), format!(r#"k={}"#, v));
     }
 
+    #[test]
+    fn test_string_value_json_hyphen() {
+        let v = "-";
+        let qv = format!(r#""{}""#, v);
+        let rec = Record::from_fields(&[("k", EncodedString::json(&qv).into())]);
+        assert_eq!(format_no_color(&rec), format!(r#"k={}"#, v));
+    }
+
+    #[test]
+    fn test_string_value_raw_hyphen() {
+        let v = "-";
+        let rec = Record::from_fields(&[("k", EncodedString::raw(&v).into())]);
+        assert_eq!(format_no_color(&rec), format!(r#"k={}"#, v));
+    }
+
     #[test]
     fn test_message_empty() {
         let rec = Record {

src/formatting.rs

@@ -46,14 +46,15 @@ pub fn looks_like_number(value: &[u8]) -> bool {
     if s[0] == b'-' {
         s = &s[1..];
     }
-    s.iter().all(|&x| {
-        if x == b'.' {
-            n_dots += 1;
-            n_dots <= 1
-        } else {
-            x.is_ascii_digit()
-        }
-    })
+    s.len() != 0
+        && s.iter().all(|&x| {
+            if x == b'.' {
+                n_dots += 1;
+                n_dots <= 1
+            } else {
+                x.is_ascii_digit()
+            }
+        })
 }
 
 // ---