add cd & escaping

Author: Clonkk

nimjl/config.nim

@@ -32,7 +32,7 @@ when defined(nimjl_cross_compile):
     JuliaLibPattern = JuliaLibPath / libPrefix & "julia*" & libSuffix
     prefixLen = len(libPrefix)+len("julia")+1 # length of the string 'libjulia.'
     suffixLen = len(libSuffix)
-    JlVersionCmd = fmt"name=$(echo libjulia.*.*.*.dylib); vers=${name:{prefixLen}:-{suffixLen}}; echo $vers"
+    JlVersionCmd = fmt"cd {JuliaLibPath} && name=$(echo libjulia.*.*.*.dylib); vers=$\{name:{prefixLen}:-{suffixLen}\}; echo $vers"
 else:
   const JlVersionCmd = JuliaPath / "bin" / "julia" & " -E VERSION"