Make BuildCommand report current and total build steps

This adds a [Build 1/12765] to the output of the building of each
artifact. This makes it easier to see how much work there might
still be remaining.

2 files changed, 14 insertions, 3 deletions

diff --git a/morphlib/app.py b/morphlib/app.py
index 47288a6a..eaba5dd9 100755
--- a/morphlib/app.py
+++ b/morphlib/app.py
@@ -173,6 +173,9 @@ class Morph(cliapp.Application):
             raise morphlib.Error(
                 'System time is far in the past, please set your system clock')
 
+    def setup(self):
+        self.status_prefix = ''
+
     def process_args(self, args):
         self.check_time()
 
@@ -342,11 +345,14 @@ class Morph(cliapp.Application):
         * ``error`` should be true when it is an error message
 
         All other keywords are ignored unless embedded in ``msg``.
+        
+        The ``self.status_prefix`` string is prepended to the output.
+        It is set to the empty string by default.
 
         '''
 
         assert 'msg' in kwargs
-        text = kwargs['msg'] % kwargs
+        text = self.status_prefix + (kwargs['msg'] % kwargs)
 
         error = kwargs.get('error', False)
         chatty = kwargs.get('chatty', False)
diff --git a/morphlib/buildcommand.py b/morphlib/buildcommand.py
index 27fec4da..d6d8dca6 100644
--- a/morphlib/buildcommand.py
+++ b/morphlib/buildcommand.py
@@ -51,7 +51,7 @@ class BuildCommand(object):
             artifact = self.get_artifact_object(repo_name, ref, filename)
             self.build_in_order(artifact)
 
-        self.app.status(msg='Build ends successfully', chatty=True)
+        self.app.status(msg='Build ends successfully')
 
     def new_build_env(self):
         '''Create a new BuildEnvironment instance.'''
@@ -181,8 +181,13 @@ class BuildCommand(object):
         self.app.status(msg='Building according to build ordering',
                         chatty=True)
 
-        for a in artifact.walk():
+        artifacts = artifact.walk()
+        old_prefix = self.app.status_prefix
+        for i, a in enumerate(artifacts):
+            self.app.status_prefix = (
+                old_prefix + '[Build %d/%d] ' % ((i+1), len(artifacts)))
             self.build_artifact(a)
+        self.app.status_prefix = old_prefix
 
     def build_artifact(self, artifact):
         '''Build one artifact.