Fixes mac installer, stops pegging gcc@7 minor and patch versions

README.md

@@ -234,6 +234,8 @@ Initial Release: December 2014
 - Sets part.left/right/top/bottom using geometry.ACC constant, tests added
 - Fixes issue https://github.com/spacether/pycalculix/issues/57 where part.left
   was not being set if a line was slightly skewed
+- Fixes a mac install issue where gcc@7 was assuming a specific X.X.X version
+  of gcc7
 
 #### 1.1.1
 - Omits test_pinned_plate from Mac OS X with Python >= 3.6 because it does not

docs/index.rst

@@ -1,5 +1,5 @@
 .. pycalculix documentation master file, created by
-   sphinx-quickstart on Fri Dec 14 10:41:52 2018.
+   sphinx-quickstart on Sun Dec 23 14:21:14 2018.
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 

pycalculix/installer.py

@@ -131,24 +131,29 @@ def mac_add_ccx():
     subprocess.check_call(command_line, shell=True)
     # check to see if we have the fortran that ccx needs and return if we do
     gcc7_to_path = "/usr/local/opt/gcc/lib/gcc/7"
+
     needed_fortran_path = "%s/libgfortran.4.dylib" % gcc7_to_path
     if os.path.isfile(needed_fortran_path):
         if os.path.islink(link_to_path):
             print('Linked gcc7 fortran found and used')
         else:
             print('System gcc7 fortran found and used')
+        print('Finished installing calculix (ccx)')
         return
     # install gcc@7 with brew if we don't have it
-    brew_fortran_path = ("/usr/local/Cellar/gcc@7/7.3.0/lib/gcc/7/"
-                         "libgfortran.4.dylib")
-    if not os.path.isfile(brew_fortran_path):
+    paths = glob.glob("/usr/local/Cellar/gcc@7/*")
+    if not paths:
         command_line = "brew install gcc@7"
         subprocess.check_call(command_line, shell=True)
         print('Installed gcc@7 (needed by calculix)')
+        paths = glob.glob("/usr/local/Cellar/gcc@7/*")
     # link gcc@7 from_path to to_path
-    gcc7_from_path = "/usr/local/Cellar/gcc@7/7.3.0/lib/gcc/7"
+    gcc7_from_path = "%s/lib/gcc/7" % paths[-1]
     command_line = "ln -s %s %s" % (gcc7_from_path, gcc7_to_path)
     subprocess.check_call(command_line, shell=True)
+    if not os.path.isfile(needed_fortran_path):
+        raise Exception("Install failed, libgfortran.4.dylib (a library that "
+                        "ccx needs) was NOT FOUND")
     print('Finished installing calculix (ccx)')