util: make wrap() require a width argument

This keeps hgweb's help engine from poking at file descriptors that
don't exist.

mercurial/commands.py

@@ -1949,7 +1949,7 b' def help_(ui, name=None, with_version=Fa'
                 commands = cmds[f].replace("|",", ")
                 ui.write(" %s:\n      %s\n"%(commands, h[f]))
             else:
-                ui.write('%s\n' % (util.wrap(h[f],
+                ui.write('%s\n' % (util.wrap(h[f], textwidth,
                                              initindent=' %-*s   ' % (m, f),
                                              hangindent=' ' * (m + 4))))
 
@@ -2106,7 +2106,7 b' def help_(ui, name=None, with_version=Fa'
             if desc:
                 initindent = ' %s%s  ' % (opt, ' ' * (hanging - width))
                 hangindent = ' ' * (hanging + 3)
-                ui.write('%s\n' % (util.wrap(desc,
+                ui.write('%s\n' % (util.wrap(desc, textwidth,
                                              initindent=initindent,
                                              hangindent=hangindent)))
             else:

mercurial/util.py

@@ -1313,9 +1313,7 b' class MBTextWrapper(textwrap.TextWrapper'
 
 #### naming convention of above implementation follows 'textwrap' module
 
-def wrap(line, width=None, initindent='', hangindent=''):
-    if width is None:
-        width = termwidth() - 2
+def wrap(line, width, initindent='', hangindent=''):
     maxindent = max(len(hangindent), len(initindent))
     if width <= maxindent:
         # adjust for weird terminal size