#!/bin/bash

STASH_NAME="stash-$(date +'%d-%m-%y-%H-%M-%S')"
STASH_PATCH=$STASH_NAME.dpatch

mkdir repo
cd repo
darcs init

echo testing > file
darcs add file
darcs record -a -m 'Add file'

echo -e "with\nsome\nlines" >> file

darcs wh # unique prefixes are allowed in darcs - wh(atsnew)

# Let's stash!
darcs rec -am $STASH_NAME

# In recent darcs (>2.5 I think), you can say this: 
darcs obliterate --last 1 -a -o $STASH_PATCH
# -o creates a dpatch in current dir with given name, and -a says accept "all"
# chosen patches 

# To get back to our old state:
darcs apply $STASH_PATCH
darcs unrecord --last 1 -a
rm $STASH_PATCH

########### NEWER DARCS (> 2.5) GO NO FURTHER! ########### 
# For older darcs without -o option to obliterate:

# First, get back to our full recorded state of two patches
darcs rec -am $STASH_NAME

# Need to do some juggling to generate the dpatch file, by setting up a target
# repo to "darcs send" to.
cd ..
mkdir send-target
cd send-target
darcs init 
darcs pull ../repo -p 'Add file' -a
cd ../repo

# Now, we can "send" our patch to the new repo, and output into a file.
darcs send -a -o $STASH_PATCH --no-edit ../send-target 
darcs ob --last 1 -a

# Again, to get back where we were
darcs apply $STASH_PATCH
darcs unrecord --last 1 -a