Re: [Zutils-bug] Any de/compressor support

[Antonio Diaz Diaz]

Adam Tuja wrote:
> > zutilsrc just allows changing the command used to decompress each supported
> > format, but it can't be used to define new formats.
>
> I don't want to add any new compressors. User will. And it's their
> responsibility to do it right. Not yours.

It is impossible to add new compressors to zutils without modifying the code 
because the zutils detect the format of the data, not the extension of the 
file. Else they could not process data from a pipe, for example:

$ cat fox
The quick brown fox jumps over the lazy dog.
$ gzip -c fox | zgrep dog
The quick brown fox jumps over the lazy dog.
$ lzip -c fox | zgrep dog
The quick brown fox jumps over the lazy dog.

File name extensions are used to exclude files from processing, not to 
determine the format.

Most of zutils do not work like tar and are not scripts with a switch 
statement that one can expand at will. They do not contain something like this:
  case "$1" in
  *.gz) gzip -dc "$1"  2>/dev/null ;;
  *.bz2) bzip2 -dc "$1" 2>/dev/null ;;
  *.lz) lzip -dc "$1"  2>/dev/null ;;

BTW, how do you propose that zutils processes data from a pipe if the data 
is in an user-defined format?

> > What you ask requires the redesign of zutils. Currently adding a new format
> > requires making changes to most source files.
>
> It's not necessary. I ask to add ability to parse extension and then use
> program defined in configuration (file).

Adding an "ability" incompatible with the way zutils works, requires the 
redesign of zutils.


Best regards,
Antonio.