import and startup cleanups

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import and startup cleanups

add commands:run()
add copyright notice to commands
eliminate/reorganize imports to speed up start time:

0.5b:
$ time bash -c 'for i in `seq 100`; do ~/bin/hg > /dev/null; done'

real    0m7.718s
user    0m6.719s
sys     0m0.794s

new:

$ time bash -c 'for i in `seq 100`; do hg > /dev/null; done' 
real    0m2.171s
user    0m1.684s
sys     0m0.444s

just python:

$ time bash -c 'for i in `seq 100`; do python -c pass; done' 
real    0m0.988s
user    0m0.771s
sys     0m0.207s

Ignoring the fixed cost of loading the Python interpreter, we're 5.6
times faster. With the Python load time, we're still 3.5 times faster.

manifest hash: acce5882a55c76eb165316f5741724c8ce4ef587
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hg

@@ -8,16 +8,7 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-# the psyco compiler makes commits a bit faster
-# and makes changegroup merge about 20 times slower!
-# try:
-#    import psyco
-#    psyco.full()
-# except:
-#    pass
-
-import sys
 from mercurial import commands
 
-sys.exit(commands.dispatch(sys.argv[1:]))
+commands.run()
 

mercurial/commands.py

@@ -1,4 +1,11 b''
-import os, re, traceback, sys, signal, time, mdiff
+# commands.py - command processing for mercurial
+#
+# Copyright 2005 Matt Mackall <[e-mail]>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+import os, re, sys, signal, time, mdiff
 from mercurial import fancyopts, ui, hg
 
 class UnknownCommand(Exception): pass
@@ -522,6 +529,9 b' class SignalInterrupt(Exception): pass'
 def catchterm(*args):
     raise SignalInterrupt
 
+def run():
+    sys.exit(dispatch(sys.argv[1:]))
+
 def dispatch(args):
     options = {}
     opts = [('v', 'verbose', None, 'verbose'),
@@ -562,6 +572,7 b' def dispatch(args):'
     except KeyboardInterrupt:
         u.warn("interrupted!\n")
     except TypeError, inst:
+        import traceback
         # was this an argument error?
         tb = traceback.extract_tb(sys.exc_info()[2])
         if len(tb) > 2: # no

mercurial/hg.py

@@ -5,9 +5,8 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import sys, struct, sha, socket, os, time, re, urllib2, tempfile
-import urllib
-from mercurial import byterange, lock
+import sys, struct, os
+from mercurial import lock
 from mercurial.transaction import *
 from mercurial.revlog import *
 from difflib import SequenceMatcher
@@ -139,6 +138,7 b' class changelog(revlog):'
 
     def add(self, manifest, list, desc, transaction, p1=None, p2=None,
                   user=None, date=None):
+        import socket, time
         user = (user or
                 os.environ.get("HGUSER") or
                 os.environ.get("EMAIL") or
@@ -315,6 +315,7 b' class localrepository:'
             self.dirstate = dirstate(self.opener, ui, self.root)
 
     def ignore(self, f):
+        import re
         if self.ignorelist is None:
             self.ignorelist = []
             try:
@@ -967,6 +968,8 b' class localrepository:'
     def merge3(self, fn, my, other):
         """perform a 3-way merge in the working directory"""
         
+        import tempfile
+        
         def temp(prefix, node):
             pre = "%s~%s." % (os.path.basename(fn), prefix)
             (fd, name) = tempfile.mkstemp("", pre)
@@ -1177,10 +1180,14 b' class remoterepository:'
 
 def repository(ui, path=None, create=0):
     if path and path[:7] == "http://":
+        import urllib, urllib2
         return remoterepository(ui, path)
     if path and path[:5] == "hg://":
+        import urllib, urllib2
         return remoterepository(ui, path.replace("hg://", "http://"))
     if path and path[:11] == "old-http://":
+        import urllib, urllib2
+        from mercurial import byterange
         return localrepository(ui, path.replace("old-http://", "http://"))
     else:
         return localrepository(ui, path, create)

mercurial/mdiff.py

@@ -5,7 +5,7 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import difflib, struct, mmap
+import difflib, struct
 from mercurial.mpatch import *
 
 def unidiff(a, ad, b, bd, fn):

mercurial/ui.py

@@ -5,7 +5,7 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import os, tempfile, sys, re
+import os, sys, re
 
 class ui:
     def __init__(self, verbose=False, debug=False, quiet=False,
@@ -37,6 +37,7 b' class ui:'
     def debug(self, *msg):
         if self.debugflag: self.write(*msg)
     def edit(self, text):
+        import tempfile
         (fd, name) = tempfile.mkstemp("hg")
         f = os.fdopen(fd, "w")
         f.write(text)