figuring out mercurial

[Thomas L. Scofield]

I know I could probably do a lot of reading (and certainly should!)  
to find the answer to my questions---I'm just sure someone out there  
can give me the basic idea much quicker.  So that you know, this is  
my first time doing shared program development, so I don't have any  
experience with CVS, svn, etc. to draw on.

I started with the commands

    hg clone http://www.octave.org/hg/octave
    hg clone octave octave-imread1

The files I've worked on thus far (and wish to submit their changes)  
were new to Octave; until now they have been part of the image  
package (in octave-forge).  After some fiddling, I decided that I  
should add these two files in their unaltered (octave-forge) form  
first.  I placed them in src/DLD_FUNCTIONS, then ran

    hg add <file1>
    hg add <file2>

I then replaced both of these files with my altered copies.  Then I ran

    hg diff       (actually produces something meaningful, because of  
the procedure I followed)
    hg ci

Now I run "hg export" (or "hg export -o imread.diff"), and get the  
message

    abort: export requires at least one changeset

What should I be doing differently?  Also, will "hg export", when run  
properly, be the last step in the process?  Or will I need to send an  
email to the maintainers list with a .diff file attached?

Thanks.

Thomas L. Scofield
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Associate Professor
Department of Mathematics and Statistics
Calvin College
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