updated setup

setup.py

@@ -16,6 +16,12 @@ if not GSL_DIR:
         "Warning: GSL_DIR is not set, this might lead to errors along the installation if\
         there is no other version of GSL in the include dirs"
     )
+BINARY_C_DIR = os.getenv("BINARY_C", None)
+if not BINARY_C_DIR:
+    print("Error: the BINARY_C environment variable is not set. Aborting setup")
+    quit()
+
+
 
 # TODO: write code to know exact parent directory of this file.
 CWD = os.getcwd()
@@ -25,7 +31,7 @@ CWD = os.getcwd()
 ############################################################
 
 # binary_c must be installed.
-BINARY_C_CONFIG = os.environ["BINARY_C"] + "/binary_c-config"
+BINARY_C_CONFIG = os.path.join(BINARY_C_DIR, "binary_c-config")
 
 BINARY_C_INCDIRS = (
     subprocess.run(
@@ -62,9 +68,9 @@ DEFINES = (
     .stdout.decode("utf-8")
     .split()
 )
+
 LONE = re.compile("^-D(.+)$")
 PARTNER = re.compile("^-D(.+)=(.+)$")
-
 for x in DEFINES:
     y = PARTNER.match(x)
     if y:
@@ -75,14 +81,18 @@ for x in DEFINES:
             BINARY_C_DEFINE_MACROS.extend([(y.group(1), None)])
 
 # add API header file
-API_h = os.environ["BINARY_C"] + "/src/API/binary_c_API.h"
+API_h = os.path.join(BINARY_C_DIR, "src", "API", "binary_c_API.h")
 BINARY_C_DEFINE_MACROS.extend([("BINARY_C_API_H", API_h)])
 
 ############################################################
 # Setting all directories and LIBRARIES to their final values
 ############################################################
 INCLUDE_DIRS = (
-    [os.environ["BINARY_C"] + "/src", os.environ["BINARY_C"] + "/src/API", "include",]
+    [
+        os.path.join(BINARY_C_DIR, "src"), 
+        os.path.join(BINARY_C_DIR, "src", "API"), 
+        "include",
+    ]
     + BINARY_C_INCDIRS
     + [os.path.join(GSL_DIR, "include")]
     if GSL_DIR
@@ -92,14 +102,14 @@ INCLUDE_DIRS = (
 LIBRARIES = ["binary_c"] + BINARY_C_LIBS + ["binary_c_api"]
 
 LIBRARY_DIRS = [
-    os.environ["BINARY_C"] + "/src",
+    os.path.join(BINARY_C_DIR, "src"),
     "./",
     os.path.join(CWD, "lib/"),
     # os.path.join(CWD, "binarycpython/core/"),
 ] + BINARY_C_LIBDIRS
 
 RUNTIME_LIBRARY_DIRS = [
-    os.environ["BINARY_C"] + "/src",
+    os.path.join(BINARY_C_DIR, "src"),
     "./",
     os.path.join(CWD, "lib/"),
     # os.path.join(CWD, "binarycpython/core/"),
@@ -142,6 +152,10 @@ def readme():
     with open("README.md") as file:
         return file.read()
 
+def license():
+    """Opens license file and returns the content"""
+    with open("LICENSE.md") as file:
+        return file.read()
 
 ############################################################
 # Making the extension function
@@ -152,7 +166,7 @@ setup(
     version="0.2",
     description="This is a python API for binary_c by David Hendriks, Rob Izzard and collaborators.\
         Based on the initial set up by Jeff andrews",
-    author=" David Hendriks, Robert Izzard and Jeff Andrews",
+    author="David Hendriks, Robert Izzard and Jeff Andrews",
     author_email="davidhendriks93@gmail.com/d.hendriks@surrey.ac.uk,\
         r.izzard@surrey.ac.uk/rob.izzard@gmail.com andrews@physics.uoc.gr",
     long_description=readme(),