Catch broken pipes in command interpreter

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Catch broken pipes in command interpreter

manifest hash: b1550ec705836af571bf0c0921d9e768ac5e5e80
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mercurial/commands.py

@@ -571,6 +571,11 b' def dispatch(args):'
         u.warn("killed!\n")
     except KeyboardInterrupt:
         u.warn("interrupted!\n")
+    except IOError, inst:
+        if inst.errno == 32:
+            u.warn("broken pipe\n")
+        else:
+            raise
     except TypeError, inst:
         import traceback
         # was this an argument error?