Fix rune parsing

changelog.org

@@ -1,3 +1,6 @@
+* v0.4.6
+- fix parsing of single runes, i.e. when doing ~defUnit(Ω•m⁻¹)~ the
+  parser would try to parse the Ω as a single ~char~ and not a unicode rune
 * v0.4.5
 - fix parsing of long unit names that are not in the unit table,
   i.e. ~let x = 5.Foobar~, which would previously print the following

src/unchained/parse_units.nim

@@ -37,7 +37,7 @@ proc parsePrefixAndUnit(tab: UnitTable, x: string, start, stop: int):
     doAssert false
   of 1: # short unit without SI prefix
     # must be short unit, e.g. `J`
-    result.unit = tab.getShort($x[start])
+    result.unit = tab.getShort($x.runeAt(start))
   of 2:
     # short unit with prefix (this means disallow long versions with length
     # shorter than 3, unless we added a `isUpper` check

tests/tunchained.nim

@@ -1052,6 +1052,11 @@ suite "Unchained - Bug issues":
     type Foo = UnitLess
     check 1.Foo * 1.Foo == 1.UnitLess
 
+  test "Define units with runes":
+    defUnit(Ω•m⁻¹)
+    let x = 5.Ω•m⁻¹
+    check typeof(x) is Ω•m⁻¹
+
 suite "Utils":
   test "Power w/ static integer exponents for floats":
     let x = 5