bisect: status message when no action is specified

mercurial/commands.py

@@ -285,7 +285,10 b' def bisect(ui, repo, rev=None, extra=Non'
         else:
             reset = True
     elif extra or good + bad + skip + reset > 1:
-        raise util.Abort("Incompatible arguments")
+        raise util.Abort(_('incompatible arguments'))
+    elif not (good or bad or skip or reset):
+        ui.status(_('(no action selected)\n'))
+        return
 
     if reset:
         p = repo.join("bisect.state")

tests/test-bisect

@@ -55,6 +55,9 b' hg bisect -g null'
 hg bisect -bU tip
 hg id
 
+echo % test no action message
+hg bisect
+
 # reproduce AssertionError (issue1228 and issue1182)
 hg bisect -r
 hg bisect -b 4

tests/test-bisect.out

@@ -241,6 +241,8 b' abort: Inconsistent state, 31:58c80a7c8a'
 error
 Testing changeset 15:e7fa0811edb0 (32 changesets remaining, ~5 tests)
 5cd978ea5149
+% test no action message
+(no action selected)
 Testing changeset 2:db07c04beaca (4 changesets remaining, ~2 tests)
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 Testing changeset 1:5cd978ea5149 (4 changesets remaining, ~2 tests)