util: fix default termwidth() under Windows stable

util: fix default termwidth() under Windows

  sys.stdout.write('-'*80 + '\n')

or

  sys.stdout.write('-'*80 + '\r')

do not work on Windows as they do on unix. On a 80 columns Windows console, the
extra CR or LF are interpreted as if belonging to the next line, so the first
command displays 2 lines (only one on unix) and the second one leave the line
visible and move back to the following line. To avoid this, we sacrifice one
column under Windows.

--- a/mercurial/posix.py	Tue Apr 27 00:44:06 2010 +0530
+++ b/mercurial/posix.py	Mon Apr 26 22:30:40 2010 +0200
@@ -264,3 +264,27 @@
 
 def gethgcmd():
     return sys.argv[:1]
+
+def termwidth_():
+    try:
+        import termios, array, fcntl
+        for dev in (sys.stderr, sys.stdout, sys.stdin):
+            try:
+                try:
+                    fd = dev.fileno()
+                except AttributeError:
+                    continue
+                if not os.isatty(fd):
+                    continue
+                arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8)
+                return array.array('h', arri)[1]
+            except ValueError:
+                pass
+            except IOError, e:
+                if e[0] == errno.EINVAL:
+                    pass
+                else:
+                    raise
+    except ImportError:
+        pass
+    return 80

--- a/mercurial/util.py	Tue Apr 27 00:44:06 2010 +0530
+++ b/mercurial/util.py	Mon Apr 26 22:30:40 2010 +0200
@@ -1245,35 +1245,6 @@
     # Avoid double backslash in Windows path repr()
     return repr(s).replace('\\\\', '\\')
 
-def termwidth():
-    if 'COLUMNS' in os.environ:
-        try:
-            return int(os.environ['COLUMNS'])
-        except ValueError:
-            pass
-    try:
-        import termios, array, fcntl
-        for dev in (sys.stderr, sys.stdout, sys.stdin):
-            try:
-                try:
-                    fd = dev.fileno()
-                except AttributeError:
-                    continue
-                if not os.isatty(fd):
-                    continue
-                arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8)
-                return array.array('h', arri)[1]
-            except ValueError:
-                pass
-            except IOError, e:
-                if e[0] == errno.EINVAL:
-                    pass
-                else:
-                    raise
-    except ImportError:
-        pass
-    return 80
-
 def wrap(line, hangindent, width=None):
     if width is None:
         width = termwidth() - 2
@@ -1357,3 +1328,11 @@
             if not i:
                 return False
         return True
+
+def termwidth():
+    if 'COLUMNS' in os.environ:
+        try:
+            return int(os.environ['COLUMNS'])
+        except ValueError:
+            pass
+    return termwidth_()

--- a/mercurial/windows.py	Tue Apr 27 00:44:06 2010 +0530
+++ b/mercurial/windows.py	Mon Apr 26 22:30:40 2010 +0200
@@ -356,6 +356,13 @@
 def gethgcmd():
     return [sys.executable] + sys.argv[:1]
 
+def termwidth_():
+    # cmd.exe does not handle CR like a unix console, the CR is
+    # counted in the line length. On 80 columns consoles, if 80
+    # characters are written, the following CR won't apply on the
+    # current line but on the new one. Keep room for it.
+    return 79
+
 try:
     # override functions with win32 versions if possible
     from win32 import *