Enable demandimport only in scripts, not in importable modules (issue605)

This way other applications can choose if and when they want this feature,
because it might be problematic if those applications rely on ImportError.

contrib/hg-ssh

@@ -25,6 +25,9 b' You can use pattern matching of your nor'
 command="cd repos && hg-ssh user/thomas/* projects/{mercurial,foo}"
 """
 
+# enable importing on demand to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
 from mercurial import dispatch
 
 import sys, os

contrib/hgwebdir.fcgi

@@ -2,6 +2,9 b''
 #
 # An example CGI script to export multiple hgweb repos, edit as necessary
 
+# enable demandloading to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
 # send python tracebacks to the browser if an error occurs:
 import cgitb
 cgitb.enable()

hg

@@ -7,5 +7,8 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
+# enable importing on demand to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
 import mercurial.dispatch
 mercurial.dispatch.run()

hgweb.cgi

@@ -2,6 +2,9 b''
 #
 # An example CGI script to use hgweb, edit as necessary
 
+# enable importing on demand to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
 # send python tracebacks to the browser if an error occurs:
 import cgitb
 cgitb.enable()

hgwebdir.cgi

@@ -2,6 +2,9 b''
 #
 # An example CGI script to export multiple hgweb repos, edit as necessary
 
+# enable importing on demand to reduce startup time
+from mercurial import demandimport; demandimport.enable()
+
 # send python tracebacks to the browser if an error occurs:
 import cgitb
 cgitb.enable()

mercurial/hgweb/hgwebdir_mod.py

@@ -6,7 +6,6 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-from mercurial import demandimport; demandimport.enable()
 import os, mimetools, cStringIO
 from mercurial.i18n import gettext as _
 from mercurial import ui, hg, util, templater

setup.py

@@ -14,8 +14,6 b' from distutils.core import setup, Extens'
 from distutils.command.install_data import install_data
 
 import mercurial.version
-import mercurial.demandimport
-mercurial.demandimport.enable = lambda: None
 
 extra = {}