[PATCH] Add 'stg prev' and 'stg next'

[Hannes Eder <heder@google.com>]

These commands are related to 'stg top'.  They print the patch below
resp. above the topmost patch, given that they exist.

Signed-off-by: Hannes Eder <heder@google.com>
---
Ok, I confess it's not kill feature, but Mercurial has these commands
and I use them from time to time.  Maybe somebody else finds it useful
as well, so I decided to share it. ;)

Cheers,
Hannes

 stgit/commands/next.py |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 stgit/commands/prev.py |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+), 0 deletions(-)
 create mode 100644 stgit/commands/next.py
 create mode 100644 stgit/commands/prev.py

diff --git a/stgit/commands/next.py b/stgit/commands/next.py
new file mode 100644
index 0000000..c8e2599
--- /dev/null
+++ b/stgit/commands/next.py
@@ -0,0 +1,48 @@
+__copyright__ = """
+Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+"""
+
+from stgit.argparse import opt
+from stgit.commands import common
+from stgit.out import out
+from stgit import argparse
+
+help = 'Print the name of the next patch'
+kind = 'stack'
+usage = ['']
+description = """
+Print the name of the next patch."""
+
+args = []
+options = [
+    opt('-b', '--branch', args = [argparse.stg_branches],
+        short = 'Use BRANCH instead of the default branch')]
+
+directory = common.DirectoryHasRepositoryLib()
+
+def func(parser, options, args):
+    """Show the name of the next patch
+    """
+    if len(args) != 0:
+        parser.error('incorrect number of arguments')
+
+    stack = directory.repository.get_stack(options.branch)
+    unapplied = stack.patchorder.unapplied
+
+    if unapplied:
+        out.stdout(unapplied[0])
+    else:
+        raise common.CmdException, 'No unapplied patches'
diff --git a/stgit/commands/prev.py b/stgit/commands/prev.py
new file mode 100644
index 0000000..79f97a8
--- /dev/null
+++ b/stgit/commands/prev.py
@@ -0,0 +1,48 @@
+__copyright__ = """
+Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+"""
+
+from stgit.argparse import opt
+from stgit.commands import common
+from stgit.out import out
+from stgit import argparse
+
+help = 'Print the name of the previous patch'
+kind = 'stack'
+usage = ['']
+description = """
+Print the name of the previous patch."""
+
+args = []
+options = [
+    opt('-b', '--branch', args = [argparse.stg_branches],
+        short = 'Use BRANCH instead of the default branch')]
+
+directory = common.DirectoryHasRepositoryLib()
+
+def func(parser, options, args):
+    """Show the name of the previous patch
+    """
+    if len(args) != 0:
+        parser.error('incorrect number of arguments')
+
+    stack = directory.repository.get_stack(options.branch)
+    applied = stack.patchorder.applied
+
+    if applied and len(applied) >= 2:
+        out.stdout(applied[-2])
+    else:
+        raise common.CmdException, 'Not enough applied patches'