Merge pull request #1680 from getnikola/dependency-injection

Dependency injection
getnikola · May 4, 2015 · e427fc0 · e427fc0
2 parents a3e27f7 + 3717534
commit e427fc0
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diff --git a/CHANGES.txt b/CHANGES.txt
@@ -4,6 +4,7 @@ New in master
 Features
 --------
 
+* Plugins can manipulate task dependencies (Issue #1679)
 * LINK_CHECK_WHITELIST now works with output relative and full fs paths
 * Four new filters: html_tidy_nowrap, html_tidy_wrap, html_tidy_wrap_attr,
   and html_tidy_mini for prettification and minification. Requires tidy5.

diff --git a/nikola/nikola.py b/nikola/nikola.py
@@ -286,6 +286,7 @@ def __init__(self, **config):
         self.quiet = config.pop('__quiet__', False)
         self.configuration_filename = config.pop('__configuration_filename__', False)
         self.configured = bool(config)
+        self.injected_deps = defaultdict(list)
 
         self.rst_transforms = []
         self.template_hooks = {
@@ -1319,6 +1320,9 @@ def flatten(task):
             for task in flatten(pluginInfo.plugin_object.gen_tasks()):
                 assert 'basename' in task
                 task = self.clean_task_paths(task)
+                if 'task_dep' not in task:
+                    task['task_dep'] = []
+                task['task_dep'].extend(self.injected_deps[task['basename']])
                 yield task
                 for multi in self.plugin_manager.getPluginsOfCategory("TaskMultiplier"):
                     flag = False

diff --git a/nikola/plugin_categories.py b/nikola/plugin_categories.py
@@ -75,6 +75,10 @@ def inject_templates(self):
             # so let’s just ignore it and be done with it.
             pass
 
+    def inject_dependency(self, target, dependency):
+        """Add 'dependency' to the target task's task_deps"""
+        self.site.injected_deps[target].append(dependency)
+
 
 class Command(BasePlugin, DoitCommand):
     """These plugins are exposed via the command line.