update doc for #290

docs/installation.md

@@ -136,11 +136,13 @@ Beside the python dependencies defined in [requirements.txt](https://github.com/
 dotdrop depends on following tools:
 
 * `diff`
-* `file` (if libmagic is not installed, see <https://github.com/ahupp/python-magic>)
 * `git` (only if using the entry point script [dotdrop.sh](https://github.com/deadc0de6/dotdrop/blob/master/dotdrop.sh))
 * `readlink` or `realpath` (only if using the entry point script [dotdrop.sh](https://github.com/deadc0de6/dotdrop/blob/master/dotdrop.sh))
 
-For MacOS users, make sure to install `realpath` (part of `coreutils`) through [homebrew](https://brew.sh/).
+For MacOS users, make sure to install below packages through [homebrew](https://brew.sh/):
+
+* [coreutils](https://formulae.brew.sh/formula/coreutils) (only if using the entry point script [dotdrop.sh](https://github.com/deadc0de6/dotdrop/blob/master/dotdrop.sh) - realpath)
+* [libmagic](https://formulae.brew.sh/formula/libmagic) - python-magic
 
 ## Update dotdrop submodule
 

dotdrop/templategen.py

@@ -152,6 +152,7 @@ class Templategen:
             if self.debug:
                 self.log.dbg('using \"magic\" for filetype identification')
         except ImportError:
+            # fallback
             _, filetype = utils.run(['file', '-b', '--mime-type', src],
                                     raw=False, debug=self.debug)
             if self.debug:

dotdrop/utils.py

@@ -275,25 +275,32 @@ def dependencies_met():
         if not which(dep):
             raise Exception(err.format(dep))
     # check python deps
-    err = 'missing python module {}'
+    err = 'missing python module \"{}\"'
+
+    # python-magic
     try:
         import magic
         assert(magic)
+        if not hasattr(magic, 'from_file'):
+            LOG.warn(err.format('python-magic'))
     except ImportError:
-        raise Exception(err.format('python-magic'))
-    if not hasattr(magic, 'from_file'):
-        e = 'wrong magic module found'
-        raise Exception(e)
+        LOG.warn(err.format('python-magic'))
+
+    # docopt
     try:
         from docopt import docopt
         assert(docopt)
     except ImportError:
         raise Exception(err.format('docopt'))
+
+    # jinja2
     try:
         import jinja2
         assert(jinja2)
     except ImportError:
         raise Exception(err.format('jinja2'))
+
+    # ruamel.yaml
     try:
         from ruamel.yaml import YAML
         assert(YAML)