Mercurial (hg) cheat sheet
This page contains some helpful commands to use when interacting with the GNU Octave mercurial repository.
When you do not have push permissions to the repository (you cannot add your changes using mercurial itself) and you have a modification to the current GNU Octave code, you have to generate a patch (or changeset) so developers with permissions can include them in the code. The overview of the process is as follows
- Change the code and test that your changes do work (write tests, that's the best!).
- Create the changeset (instructions below).
- Post your patch in the Patch tracker.
 Before starting
The way patches are generated uses an extension of mercurial and therefore you need to prepare your .hgrc file to use it. If you do not have a .hgrc file, just create one in your home directory. In Windows, this is something like "C:\Documents and Settings\your_name\Mercurial.ini"
Add the following code to that file:
[extensions] hgext.mq = hgext.pager = color = [pager] pager = LESS='FSRX' less attend = help, annotate, cat, diff, export, glog, log, qdiff, status, outgoing, incoming ## Colours I like [color] status.modified = magenta bold status.added = green bold status.removed = red bold status.deleted = cyan bold status.unknown = gray bold status.ignored = gray bold
The only part that is important is the extensions. The rest is to make hg behave in a fancy way (recommended).
 Creating changesets with hg
 Simple way
- Update to the latest revision.
- Make your changes and save.
- Commit your code following the commit message guidelines.
- Export the modifications.
hg export -r tip -o mypatch.patch
- Save the output to a file and upload it tot he patch tracker.
 Using the extension
In the repository you can start a patch by doing
hg qnew mychangeset
You can further edit your files... if you do, you need your patch to know about these changes. To do that execute
Once you think you have all the changes that make your patch complete you can export your patch
hg qdiff > mychangeset.patch
Now you can do (at least) two things
- Apply your patch to your copy (it will differ form the repository and you will have to merge somehow...). To do it run
hg qfinish tip
- Forget the changes and go back to the unpatched version of the code.
hg qrefresh hg qpop hg qfinish tip
The file mychangeset.patch contains your changes.