check python dependencies

dotdrop/dotdrop.py

@@ -690,6 +690,13 @@ def apply_trans(dotpath, dotfile, templater, debug=False):
 
 def main():
     """entry point"""
+    # check dependencies are met
+    try:
+        dependencies_met()
+    except Exception as e:
+        LOG.err(e)
+        return False
+
     try:
         o = Options()
     except YamlException as e:
@@ -702,13 +709,6 @@ def main():
     if o.debug:
         LOG.dbg('\n\n')
 
-    # check dependencies are met
-    try:
-        dependencies_met()
-    except Exception as e:
-        LOG.err(e)
-        return False
-
     ret = True
     try:
 

dotdrop/utils.py

@@ -268,11 +268,34 @@ def get_module_from_path(path):
 
 def dependencies_met():
     """make sure all dependencies are met"""
-    deps = ['file', 'diff', 'mkdir']
+    # check unix tools deps
+    deps = ['file', 'diff']
     err = 'The tool \"{}\" was not found in the PATH!'
     for dep in deps:
         if not which(dep):
             raise Exception(err.format(dep))
+    # check python deps
+    err = 'missing python module {}'
+    try:
+        import magic
+        assert(magic)
+    except ImportError:
+        raise Exception(err.format('python-magic'))
+    try:
+        from docopt import docopt
+        assert(docopt)
+    except ImportError:
+        raise Exception(err.format('docopt'))
+    try:
+        import jinja2
+        assert(jinja2)
+    except ImportError:
+        raise Exception(err.format('jinja2'))
+    try:
+        from ruamel.yaml import YAML
+        assert(YAML)
+    except ImportError:
+        raise Exception(err.format('ruamel.yaml'))
 
 
 def mirror_file_rights(src, dst):