problem checking/adding lines - sed?

[medigeek]

I'm trying to add all ubuntu packages list to an sqlite database.
Everything works out perfectly, I wget http://archive.ubuntu.com/ubuntu/dis...6/Packages.bz2 and I managed to make each line as an INSERT command.

The problem is that some parts of the list aren't always shown, specifically after "Version:"

Replaces:
Provides:
Depends:
Recommends:
Suggests:
Conflicts:

and after "Origin:"

Task:

e.g. I need to add "Replaces:" in a new line after a line that starts with "Version:" only if there isn't such a line (that begins with "Replaces:")

I've tried a sed script, but I think I have it all wrong:

s/"/'/g
:replaces
s/Replaces: /","/g
t provides
T addreplaces
:addreplaces
/Version:/ a\
Replaces:
:provides
s/Provides: /","/g
t depends
T addprovides
:addprovides
/Replaces:/ a\
Provides:
:depends
s/Depends: /","/g
t next
T adddepends
:adddepends
/Version:/ a\
Depends:
:next

I've attached a small sample of the packages.bz2 (uncompressed) for you to play with.

Thanks in advance!