trying to fix a sed line

[Troels Kofoed Jacobsen]

On Wed, Dec 16, 2009 at 04:54:09PM -0500, Chuck Robey wrote:
> I don't do enough in sed .... if I could figure out what it is that the broken
> line is TRYING to do, I think maybe I could fix it, I HAVE used sed before, and
> I know about the s command, and how it sets it's delimiters.  Anyhow, here's the
> broken line, and I hope my mailer doesn't decide to break the line for me:
> 
> REINPLACE_ARGS= -i.bak -E -e "1s,^(\#!.* )python$$,\1 -S PYTHONPATH=${DATADIR}
> ${PYTHON_CMD},1"

Inside "" we have

1s                  make a find replace in first line
^(\#!.* )python$$   Is a regexp matching what to be replaced:
                    #!/usr/bin/env python
                    In detail:
                        ^       matches start of line
                        ()      marks a group
                        \#!.*   matches /usr/bin/env (ending with a
                                 space)
                        python  matches python!
                        $       matches end of line. I think this could
                                be the error as the line only ends once
\1 -S PYTHONPATH=${DATADIR} ${PYTHON_CMD}
                    This is what the previous expression is replaced
                    with:
                    \1  puts what was in the group () from first regexp
                        e.g. #!/usr/bin/env 
                    The rest is just to set the pythonpath before
                    executing python. I have never seen this though and
                    do not know if it will work

Best regards
Troels Kofoed Jacobsen


chuckr at telenix.org
> 
> should be only a single space between ${DATADIR} and ${PYTHON_CMD}, my mailer
> put a line break in there for me ...
> 
> If you care, this came from editors/spe/Makefile.
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