Fix mac dev build

aab/git.py

@@ -35,7 +35,7 @@
 
 import logging
 
-from .utils import call_shell
+from .utils import call_shell, isMac
 
 
 class Git(object):
@@ -78,13 +78,14 @@ def modtime(self, version):
         if version == "dev":
             # Get timestamps of uncommitted changes and return the most recent.
             # https://stackoverflow.com/a/14142413
+            statcmd = "stat -f %m" if isMac else "stat -c %Y"
             cmd = (
                 "git status -s | while read mode file;"
-                " do echo $(stat -c %Y $file); done"
+                f" do echo $({statcmd} $file); done"
             )
             modtimes = call_shell(cmd).splitlines()
             # https://stackoverflow.com/a/12010656
-            modtimes = [int(modtime) for modtime in modtimes]
+            modtimes = [int(modtime) for modtime in modtimes if modtime != ""]
             return max(modtimes)
         else:
             return int(call_shell("git log -1 -s --format=%ct {}".format(version)))

aab/utils.py

@@ -36,6 +36,7 @@
 import logging
 import subprocess
 import sys
+import platform
 
 from . import PATH_ROOT
 
@@ -84,3 +85,6 @@ def copy_recursively(source, target):
     return call_shell(
         'cp -r "{source}" "{target}"'.format(source=source, target=target)
     )
+
+
+isMac = platform.system() == "Darwin"