convert: display all errors if we couldn't open the source repo

This should give the user a better hint of what's going wrong.

Improve some error messages.  In particular, mention "CVS checkout" instead
of "CVS repo".

Fixes issue822 and issue826.

hgext/convert/__init__.py

@@ -32,12 +32,16 b' sink_converters = ['
     ]
 
 def convertsource(ui, path, type, rev):
+    exceptions = []
     for name, source in source_converters:
         try:
             if not type or name == type:
                 return source(ui, path, rev)
         except NoRepo, inst:
-            ui.note(_("convert: %s\n") % inst)
+            exceptions.append(inst)
+    if not ui.quiet:
+        for inst in exceptions:
+            ui.write(_("%s\n") % inst)
     raise util.Abort('%s: unknown repository type' % path)
 
 def convertsink(ui, path, type):

hgext/convert/cvs.py

@@ -11,7 +11,7 b' class convert_cvs(converter_source):'
 
         cvs = os.path.join(path, "CVS")
         if not os.path.exists(cvs):
-            raise NoRepo("couldn't open CVS repo %s" % path)
+            raise NoRepo("%s does not look like a CVS checkout" % path)
 
         self.changeset = {}
         self.files = {}

hgext/convert/darcs.py

@@ -24,13 +24,13 b' class darcs_source(converter_source):'
         # check for _darcs, ElementTree, _darcs/inventory so that we can
         # easily skip test-convert-darcs if ElementTree is not around
         if not os.path.exists(os.path.join(path, '_darcs')):
-            raise NoRepo("couldn't open darcs repo %s" % path)
+            raise NoRepo("%s does not look like a darcs repo" % path)
 
         if ElementTree is None:
             raise util.Abort(_("Python ElementTree module is not available"))
 
         if not os.path.exists(os.path.join(path, '_darcs', 'inventory')):
-            raise NoRepo("couldn't open darcs repo %s" % path)
+            raise NoRepo("%s does not look like a darcs repo" % path)
 
         self.path = os.path.realpath(path)
 

hgext/convert/git.py

@@ -30,7 +30,7 b' class convert_git(converter_source):'
         if os.path.isdir(path + "/.git"):
             path += "/.git"
         if not os.path.exists(path + "/objects"):
-            raise NoRepo("couldn't open GIT repo %s" % path)
+            raise NoRepo("%s does not look like a Git repo" % path)
         self.path = path
 
     def getheads(self):

hgext/convert/hg.py

@@ -190,7 +190,7 b' class mercurial_source(converter_source)'
             self.repo.heads()
         except hg.RepoError:
             ui.print_exc()
-            raise NoRepo("could not open hg repo %s as source" % path)
+            raise NoRepo("%s does not look like a Mercurial repo" % path)
         self.lastrev = None
         self.lastctx = None
         self._changescache = None

hgext/convert/subversion.py

@@ -102,7 +102,7 b' class svn_source(converter_source):'
         try:
             SubversionException
         except NameError:
-            raise NoRepo('subversion python bindings could not be loaded')
+            raise NoRepo('Subversion python bindings could not be loaded')
 
         self.encoding = locale.getpreferredencoding()
         self.lastrevs = {}
@@ -131,7 +131,7 b' class svn_source(converter_source):'
             self.uuid = svn.ra.get_uuid(self.ra).decode(self.encoding)
         except SubversionException, e:
             ui.print_exc()
-            raise NoRepo("couldn't open SVN repo %s" % self.url)
+            raise NoRepo("%s does not look like a Subversion repo" % self.url)
 
         if rev:
             try: