getopts::long & option string argument

[Florian Kaufmann]

What can Getopt::Long, or any other 'standard' module offer me for
this problem task:

I have an option which expects a string argument. But a) only a finite
set of strings are to be accepted b) unique abbreviations shall be
accepted, e.g. if the set of valid strings is ("foo","bar","fly") then
"fo" should stand for "foo".

An example for such a use case is the --backup[=CONTROL] option of
many coreutils tools as for example cp, ln, install. CONTROL can only
be ("no","off","numbered"... and a few more).

 

[James Spahlinger]

What can Getopt::Long, or any other 'standard' module offer me for
this problem task:

I have an option which expects a string argument. But a) only a finite
set of strings are to be accepted b) unique abbreviations shall be
accepted, e.g. if the set of valid strings is ("foo","bar","fly") then
"fo" should stand for "foo".

An example for such a use case is the -- backup[=CONTROL] option of
many coreutils tools as for example cp, ln, install. CONTROL can only
be ("no","off","numbered"... and a few more).

What you want to do is exactly what Getopt is
for.

 

[Florian Kaufmann]

What you want to do is exactly what Getopt is
for.

So which part of "perldoc Getopt::Long" tells me how I accomplish
point a) and b) from my question? I already used Getopt::Long before,
so I know the basics. Reading the documentation, the 'only' limitation
upon the argument of an option I can make, is to tell wheter it has to
be a string, an integer, or a float. I cant say, it has to be a string
of a certain finite set. See section "options with values".

 

[Jürgen Exner]

[Quoting in full]

What can Getopt::Long, or any other 'standard' module offer me for
this problem task:

I have an option which expects a string argument. But a) only a finite
set of strings are to be accepted b) unique abbreviations shall be
accepted, e.g. if the set of valid strings is ("foo","bar","fly") then
"fo" should stand for "foo".

An example for such a use case is the -- backup[=CONTROL] option of
many coreutils tools as for example cp, ln, install. CONTROL can only
be ("no","off","numbered"... and a few more).

What you want to do is exactly what Getopt is
for.

What on earth did you do with the quoted text. You _REALLY_ should check
your quoting style. It is absolutely impossible to tell what you were
quoting and what you were saying.

jue

 

[Uri Guttman]

[Quoting in full]

Florian Kaufmann wrote:

What can Getopt::Long, or any other 'standard'
module offer me for
this problem task:

I have an option which expects a string
argument. But a) only a finite
set of strings are to be accepted b) unique
abbreviations shall be
accepted, e.g. if the set of valid strings is
("foo","bar","fly") then
"fo" should stand for "foo".

An example for such a use case is the --
backup[=CONTROL] option of
many coreutils tools as for example cp, ln,
install. CONTROL can only
be ("no","off","numbered"... and a few more).
What you want to do is exactly what Getopt is
for.

What on earth did you do with the quoted text. You _REALLY_ should check
your quoting style. It is absolutely impossible to tell what you were
quoting and what you were saying.

TJM> But it is a pretty good bellweather of the quality of the comment
TJM> offered...

beyond that, you CAN do what the OP wants with getopt::long using a
callback sub which is a closure. it would contain the hash of valid
values as well as a ref to the variable to set. see the docs for how to
use that. also Getopt::Euclid has code constraints that allow this very
thing as well and it does much more including pod and usage generation
all in one.

uri