adding support for pre/post actions

README.md

@@ -290,6 +290,49 @@ Thus when `f_vimrc` is installed, the command
 `vim +VundleClean! +VundleInstall +VundleInstall! +qall` will
 be executed.
 
+
+Sometimes, you may even want to execute some action prior deploying a dotfile.
+Let's take another example with
+[vim-plug](https://github.com/junegunn/vim-plug):
+
+```yaml
+actions:
+  pre:
+    vim-plug-install: test -e ~/.vim/autoload/plug.vim || (mkdir -p ~/.vim/autoload; curl
+      -fLo ~/.vim/autoload/plug.vim https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim)
+  vim-plug: vim +PlugInstall +qall
+config:
+  backup: true
+  create: true
+  dotpath: dotfiles
+dotfiles:
+  f_vimrc:
+    dst: ~/.vimrc
+    src: vimrc
+    actions:
+       - vim-plug-install
+       - vim-plug
+profiles:
+  home:
+    dotfiles:
+    - f_vimrc
+```
+
+This way, we make sure [vim-plug](https://github.com/junegunn/vim-plug)
+is installed prior deploying the `~/.vimrc` dotfile.
+
+
+Note: You can also define `post` actions like this:
+
+```yaml
+actions:
+  post:
+    some-action: echo "Hello, World!" >/tmp/log
+```
+
+If you don't specify neither `post` or `pre`, actions will be executed
+after dotfiles deployment (which is equivalent to `post`).
+
 ## Use transformations
 
 Transformation actions are used to transform a dotfile before it is

dotdrop/config.py

@@ -25,6 +25,8 @@ class Cfg:
 
     # key actions
     key_actions = 'actions'
+    key_actions_pre = 'pre'
+    key_actions_post = 'post'
 
     # key transformations
     key_trans = 'trans'
@@ -101,12 +103,26 @@ class Cfg:
 
     def _parse_actions(self, actions, entries):
         """ parse actions specified for an element """
-        res = []
+        res = {
+            self.key_actions_pre: [],
+            self.key_actions_post: [],
+            'actions': []
+        }
         for entry in entries:
-            if entry not in actions.keys():
+            key = 'actions'
+            action = None
+            if self.key_actions_pre in actions and entry in actions[self.key_actions_pre]:
+                key = self.key_actions_pre
+                action = actions[self.key_actions_pre][entry]
+            elif self.key_actions_post in actions and entry in actions[self.key_actions_post]:
+                key = self.key_actions_post
+                action = actions[self.key_actions_post][entry]
+            elif entry not in actions.keys():
                 self.log.warn('unknown action \"{}\"'.format(entry))
                 continue
-            res.append(actions[entry])
+            else:
+                action = actions[entry]
+            res[key].append(action)
         return res
 
     def _complete_configs(self):
@@ -124,7 +140,13 @@ class Cfg:
         if self.key_actions in self.content:
             if self.content[self.key_actions] is not None:
                 for k, v in self.content[self.key_actions].items():
-                    self.actions[k] = Action(k, v)
+                    if k in [self.key_actions_pre, self.key_actions_post]:
+                        for k2, v2 in self.content[self.key_actions][k].items():
+                            if k not in self.actions:
+                                self.actions[k] = {}
+                            self.actions[k][k2] = Action(k2, v2)
+                    else:
+                        self.actions[k] = Action(k, v)
 
         # parse all transformations
         if self.key_trans in self.content:

dotdrop/dotdrop.py

@@ -87,16 +87,20 @@ def install(opts, conf):
                      diff=opts['installdiff'], debug=opts['debug'])
     installed = []
     for dotfile in dotfiles:
+        if dotfile.actions and Cfg.key_actions_pre in dotfile.actions:
+            for action in dotfile.actions[Cfg.key_actions_pre]:
+                LOG.dbg('executing pre action {}'.format(action))
+                action.execute()
         LOG.dbg('installing {}'.format(dotfile))
         if hasattr(dotfile, 'link') and dotfile.link:
             r = inst.link(dotfile.src, dotfile.dst)
         else:
             src = dotfile.src
             tmp = None
-            if dotfile.trans:
+            if 'actions' in dotfile.trans and dotfile.trans['actions']:
                 tmp = '{}.{}'.format(src, TRANS_SUFFIX)
                 err = False
-                for trans in dotfile.trans:
+                for trans in dotfile.trans['actions']:
                     LOG.dbg('executing transformation {}'.format(trans))
                     s = os.path.join(opts['dotpath'], src)
                     temp = os.path.join(opts['dotpath'], tmp)
@@ -115,11 +119,19 @@ def install(opts, conf):
                 tmp = os.path.join(opts['dotpath'], tmp)
                 if os.path.exists(tmp):
                     remove(tmp)
-        if len(r) > 0 and len(dotfile.actions) > 0:
+        if len(r) > 0:
-            # execute action
+            if 'actions' in dotfile.actions:
-            for action in dotfile.actions:
+                actions = dotfile.actions['actions']
-                LOG.dbg('executing action {}'.format(action))
+                # execute action
-                action.execute()
+                for action in actions:
+                    LOG.dbg('executing action {}'.format(action))
+                    action.execute()
+            if Cfg.key_actions_post in dotfile.actions:
+                actions = dotfile.actions[Cfg.key_actions_post]
+                # execute action
+                for action in actions:
+                    LOG.dbg('executing post action {}'.format(action))
+                    action.execute()
         installed.extend(r)
     LOG.log('\n{} dotfile(s) installed.'.format(len(installed)))
     return True
@@ -155,7 +167,7 @@ def compare(opts, conf, tmp, focus=None):
 
     for dotfile in selected:
         LOG.dbg('comparing {}'.format(dotfile))
-        if dotfile.trans:
+        if 'actions' in dotfile.trans and dotfile.trans['actions']:
             msg = 'ignore {} as it uses transformation(s)'
             LOG.log(msg.format(dotfile.key))
             continue

dotdrop/dotfile.py

@@ -8,7 +8,7 @@ represents a dotfile in dotdrop
 class Dotfile:
 
     def __init__(self, key, dst, src,
-                 actions=[], trans=[], link=False):
+                 actions={}, trans={}, link=False):
         # key of dotfile in the config
         self.key = key
         # where to install this dotfile