# HG changeset patch
# User Thomas Arendsen Hein <thomas@intevation.de>
# Date 1183457665 -7200
# Node ID 8b90d763ea9032d40f4c6c72c7228224e84ae5ae
# Parent  37e11c768db912f3fcbbd24b9e2f956db048f805
Add extension to provide the 'hg children' command (with tests)

diff --git a/hgext/children.py b/hgext/children.py
new file mode 100644
--- /dev/null
+++ b/hgext/children.py
@@ -0,0 +1,45 @@
+# Mercurial extension to provide the 'hg children' command
+#
+# Copyright 2007 by Intevation GmbH <intevation@intevation.de>
+# Author(s):
+# Thomas Arendsen Hein <thomas@intevation.de>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+from mercurial import cmdutil, util
+from mercurial.i18n import _
+from mercurial.node import nullid
+
+
+def children(ui, repo, file_=None, **opts):
+    """show the children of the given or working dir revision
+
+    Print the children of the working directory's revisions.
+    If a revision is given via --rev, the children of that revision
+    will be printed. If a file argument is given, revision in
+    which the file was last changed (after the working directory
+    revision or the argument to --rev if given) is printed.
+    """
+    rev = opts.get('rev')
+    if file_:
+        ctx = repo.filectx(file_, changeid=rev)
+    else:
+        ctx = repo.changectx(rev)
+    if ctx.node() == nullid:
+        raise util.Abort(_("All non-merge changesets are children of "
+                           "the null revision!"))
+
+    displayer = cmdutil.show_changeset(ui, repo, opts)
+    for node in [cp.node() for cp in ctx.children()]:
+        displayer.show(changenode=node)
+
+
+cmdtable = {
+    "children":
+        (children,
+         [('r', 'rev', '', _('show children of the specified rev')),
+          ('', 'style', '', _('display using template map file')),
+          ('', 'template', '', _('display with template'))],
+         _('hg children [-r REV] [FILE]')),
+}
diff --git a/tests/test-children b/tests/test-children
new file mode 100755
--- /dev/null
+++ b/tests/test-children
@@ -0,0 +1,59 @@
+#!/bin/sh
+# test children command
+
+cat <<EOF >> $HGRCPATH
+[extensions]
+hgext.children=
+EOF
+
+echo "% init"
+hg init t
+cd t
+
+echo "% no working directory"
+hg children
+
+echo % setup
+echo 0 > file0
+hg ci -qAm 0 -d '0 0'
+
+echo 1 > file1
+hg ci -qAm 1 -d '1 0'
+
+echo 2 >> file0
+hg ci -qAm 2 -d '2 0'
+
+hg co null
+echo 3 > file3
+hg ci -qAm 3 -d '3 0'
+
+echo "% hg children at revision 3 (tip)"
+hg children
+
+hg co null
+echo "% hg children at nullrev (should be 0 and 3)"
+hg children
+
+hg co 1
+echo "% hg children at revision 1 (should be 2)"
+hg children
+
+hg co 2
+echo "% hg children at revision 2 (other head)"
+hg children
+
+for i in null 0 1 2 3; do
+  echo "% hg children -r $i"
+  hg children -r $i
+done
+
+echo "% hg children -r 0 file0 (should be 2)"
+hg children -r 0 file0
+
+echo "% hg children -r 1 file0 (should be 2)"
+hg children -r 1 file0
+
+hg co 0
+echo "% hg children file0 at revision 0 (should be 2)"
+hg children file0
+
diff --git a/tests/test-children.out b/tests/test-children.out
new file mode 100644
--- /dev/null
+++ b/tests/test-children.out
@@ -0,0 +1,52 @@
+% init
+% no working directory
+abort: All non-merge changesets are children of the null revision!
+% setup
+0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+% hg children at revision 3 (tip)
+0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+% hg children at nullrev (should be 0 and 3)
+2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+% hg children at revision 1 (should be 2)
+changeset:   2:8f5eea5023c2
+user:        test
+date:        Thu Jan 01 00:00:02 1970 +0000
+summary:     2
+
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+% hg children at revision 2 (other head)
+% hg children -r null
+abort: All non-merge changesets are children of the null revision!
+% hg children -r 0
+changeset:   1:708c093edef0
+user:        test
+date:        Thu Jan 01 00:00:01 1970 +0000
+summary:     1
+
+% hg children -r 1
+changeset:   2:8f5eea5023c2
+user:        test
+date:        Thu Jan 01 00:00:02 1970 +0000
+summary:     2
+
+% hg children -r 2
+% hg children -r 3
+% hg children -r 0 file0 (should be 2)
+changeset:   2:8f5eea5023c2
+user:        test
+date:        Thu Jan 01 00:00:02 1970 +0000
+summary:     2
+
+% hg children -r 1 file0 (should be 2)
+changeset:   2:8f5eea5023c2
+user:        test
+date:        Thu Jan 01 00:00:02 1970 +0000
+summary:     2
+
+1 files updated, 0 files merged, 1 files removed, 0 files unresolved
+% hg children file0 at revision 0 (should be 2)
+changeset:   2:8f5eea5023c2
+user:        test
+date:        Thu Jan 01 00:00:02 1970 +0000
+summary:     2
+