fix names of parent changeset ids in hooks.

fix hook part of man page.

doc/hgrc.5.txt

@@ -145,37 +145,41 b' hooks::'
     incoming.email = /my/email/hook
     incoming.autobuild = /my/build/hook
 
+  Most hooks are run with environment variables set that give added
+  useful information.  For each hook below, the environment variables
+  it is passed are listed with names of the form "$HG_foo".
+
   changegroup;;
-    Run after a changegroup has been added via push or pull. Passed
-    the ID of the first new changeset in $HG_NODE.
+    Run after a changegroup has been added via push or pull. ID of the
+    first new changeset is in $HG_NODE.
   commit;;
     Run after a changeset has been created in the local repository.
-    Passed the ID of the newly created changeset in environment
-    variable $HG_NODE.  Parent changeset IDs in $HG_P1 and $HG_P2.
+    ID of the newly created changeset is in $HG_NODE.  Parent
+    changeset IDs are in $HG_PARENT1 and $HG_PARENT2.
   incoming;;
     Run after a changeset has been pulled, pushed, or unbundled into
-    the local repository.  Passed the ID of the newly arrived
-    changeset in environment variable $HG_NODE.
+    the local repository.  The ID of the newly arrived changeset is in
+    $HG_NODE.
   precommit;;
     Run before starting a local commit.  Exit status 0 allows the
     commit to proceed.  Non-zero status will cause the commit to fail.
-    Parent changeset IDs in $HG_P1 and $HG_P2.
+    Parent changeset IDs are in $HG_PARENT1 and $HG_PARENT2.
   pretag;;
     Run before creating a tag.  Exit status 0 allows the tag to be
     created.  Non-zero status will cause the tag to fail.  ID of
-    changeset to tag in $HG_NODE.  Name of tag in $HG_TAG.  Tag is
-    local if $HG_LOCAL=1, in repo if $HG_LOCAL=0.
+    changeset to tag is in $HG_NODE.  Name of tag is in $HG_TAG.  Tag
+    is local if $HG_LOCAL=1, in repo if $HG_LOCAL=0.
   pretxncommit;;
     Run after a changeset has been created but the transaction not yet
     committed.  Changeset is visible to hook program.  This lets you
     validate commit message and changes.  Exit status 0 allows the
     commit to proceed.  Non-zero status will cause the transaction to
-    be rolled back.  ID of changeset in $HG_NODE.  Parent changeset
-    IDs in $HG_P1 and $HG_P2.
+    be rolled back.  ID of changeset is in $HG_NODE.  Parent changeset
+    IDs are in $HG_PARENT1 and $HG_PARENT2.
   tag;;
-    Run after a tag is created.  ID of tagged changeset in $HG_NODE.
-    Name of tag in $HG_TAG.  Tag is local if $HG_LOCAL=1, in repo if
-    $HG_LOCAL=0.
+    Run after a tag is created.  ID of tagged changeset is in
+    $HG_NODE.  Name of tag is in $HG_TAG.  Tag is local if
+    $HG_LOCAL=1, in repo if $HG_LOCAL=0.
 
   In earlier releases, the names of hook environment variables did not
   have a "HG_" prefix.  These unprefixed names are still provided in

mercurial/localrepo.py

@@ -382,7 +382,7 b' class localrepository(object):'
         if p2 == nullid: xp2 = ''
         else: xp2 = hex(p2)
 
-        self.hook("precommit", throw=True, p1=xp1, p2=xp2)
+        self.hook("precommit", throw=True, parent1=xp1, parent2=xp2)
 
         if not wlock:
             wlock = self.wlock()
@@ -468,14 +468,15 b' class localrepository(object):'
 
         user = user or self.ui.username()
         n = self.changelog.add(mn, changed + remove, text, tr, p1, p2, user, date)
-        self.hook('pretxncommit', throw=True, node=hex(n), p1=xp1, p2=xp2)
+        self.hook('pretxncommit', throw=True, node=hex(n), parent1=xp1,
+                  parent2=xp2)
         tr.close()
 
         self.dirstate.setparents(n)
         self.dirstate.update(new, "n")
         self.dirstate.forget(remove)
 
-        self.hook("commit", node=hex(n), p1=xp1, p2=xp2)
+        self.hook("commit", node=hex(n), parent1=xp1, parent2=xp2)
         return n
 
     def walk(self, node=None, files=[], match=util.always):