adding dynamic/interpreted template variables

dotdrop/config.py

@@ -13,6 +13,7 @@ import shlex
 from dotdrop.dotfile import Dotfile
 from dotdrop.logger import Logger
 from dotdrop.action import Action, Transform
+from dotdrop.utils import *
 
 
 TILD = '~'
@@ -44,6 +45,8 @@ class Cfg:
 
     # template variables
     key_variables = 'variables'
+    # shell variable
+    key_dynvariables = 'dynvariables'
 
     # dotfiles keys
     key_dotfiles = 'dotfiles'
@@ -521,9 +524,15 @@ class Cfg:
         return self.lnk_settings.copy()
 
     def get_variables(self):
+        variables = {}
         if self.key_variables in self.content:
-            return self.content[self.key_variables]
-        return {}
+            variables.update(self.content[self.key_variables])
+        if self.key_dynvariables in self.content:
+            # interpret dynamic variables
+            dynvars = self.content[self.key_dynvariables]
+            for key, cmd in dynvars.items():
+                variables[key] = shell(cmd)
+        return variables
 
     def dump(self):
         """return a dump of the config"""

dotdrop/utils.py

@@ -19,7 +19,7 @@ LOG = Logger()
 
 
 def run(cmd, raw=True, debug=False, checkerr=False):
-    """run a command in the shell (expects a list)"""
+    """run a command (expects a list)"""
     if debug:
         LOG.dbg('exec: {}'.format(' '.join(cmd)))
     p = subprocess.Popen(cmd, shell=False,
@@ -38,6 +38,11 @@ def run(cmd, raw=True, debug=False, checkerr=False):
     return ret == 0, lines
 
 
+def shell(cmd):
+    """run a command in the shell (expects a string)"""
+    return subprocess.getoutput(cmd)
+
+
 def diff(src, dst, raw=True, opts='', debug=False):
     """call unix diff to compare two files"""
     cmd = 'diff -r {} \"{}\" \"{}\"'.format(opts, src, dst)