[CMake] string MATCHALL

[Edoardo Pasca]

Gregor big thanks!

I had not understood that the matched string are stored in CMAKE_MATCH_<n>
variables with:
n=0 for the whole string
n=1 the first match
n=2 the second match
etc

My script has now simplified consistently

                                  string(REGEX MATCHALL "(.+)[*](.+)" match
${line})
  if (NOT ${match} EQUAL "")
        string(STRIP ${CMAKE_MATCH_1} CONDA_ENVIRONMENT)
string(STRIP ${CMAKE_MATCH_2} CONDA_ENVIRONMENT_PATH)
  endif()

Thanks again

Edo

On Tue, Oct 24, 2017 at 9:52 PM, Gregor Jasny <gjasny at googlemail.com> wrote:

> In case it helps: the GUI can contains a regex explorer where you can play
> with rexexes. But beware: there are some corner cases around quoting
> special things.
>
> I'd suggest to use if( ... MATCHES ...) And read the match from
> the CMAKE_MATCH_<n> variables.
>
>
> On Oct 24, 2017 11:16, "Edoardo Pasca" <edo.paskino at gmail.com> wrote:
>
> Dear all,
>
> I'm trying to determine the active conda environment (name and path) at
> cmake runtime.
>
> To do that I issue the command
> conda env list, which yields lines with the active environment highlighted
> with an asterisk: something similar to this:
>
> env1       /path/to/env1
> env2       / path/to/env2
> env3   *  /path/to/env3
>
> It is a perfect task for a match of REGEX but I cannot get it right and I
> defaulted to using brute force to achieve my goal.
>
> My brute force method is
> 1) splitting the lines by replacing \n with ;
> 2) now that I have a LIST (or I think that is a list) I can run a foreach
> to see if line-by-line I match the following string(REGEX MATCHALL
> "(.+)[*](.+)" match ${line})
>
> Now, I'd expect to find in ${match} a list with the captured strings, i.e.
> env3;/path/to/env3. However that's not the case ${match} contains the whole
> line. So now I REPLACE "*" with ";" and now I have a almost LIST. Actually
> I do this:
>
> string(REPLACE "*" ";" ENV_DIR ${match})
> list (APPEND cc "")
> foreach(conda ${ENV_DIR})
>      string(STRIP ${conda} stripped)
>      list(APPEND cc ${stripped})
> endforeach()
>
> Finally I've got my list ${cc} with the name and path of the environment
> as first and second element.
>
> The question is, how would I use MATCHALL to achieve my goal (if possible)?
>
> for the record I attach here the whole script.
>
> Thanks for your help
>
> Edo
>
>
> execute_process(COMMAND "conda" "env" "list"
> OUTPUT_VARIABLE _CONDA_ENVS
> RESULT_VARIABLE _CONDA_RESULT
> ERROR_VARIABLE _CONDA_ERR)
> if(NOT _CONDA_RESULT)
> string(REPLACE "\n" ";" ENV_LIST ${_CONDA_ENVS})
> foreach(line ${ENV_LIST})
>   string(REGEX MATCHALL "(.+)[*](.+)" match ${line})
>   if (NOT ${match} EQUAL "")
>     string(REPLACE "*" ";" ENV_DIR ${match})
>     list (APPEND cc "")
>     foreach(conda ${ENV_DIR})
>       string(STRIP ${conda} stripped)
>                                        list(APPEND cc ${stripped})
>     endforeach()
>     list(LENGTH cc Ns)
>                                     if (${Ns} EQUAL 2)
>       list(GET cc 0 CONDA_ENVIRONMENT)
>       list(GET cc 1 CONDA_ENVIRONMENT_PATH)
>     endif()
>   endif()
> endforeach()
> else()
> message(FATAL_ERROR "ERROR with conda command " ${_CONDA_ERR})
> endif()
>
>
> --
> Edo
> I know you think you understand what you thought I said, but I'm not sure
> you realize that what you heard is not what I meant (prob. Alan Greenspan)
> :wq
>
> --
>
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-- 
Edo
I know you think you understand what you thought I said, but I'm not sure
you realize that what you heard is not what I meant (prob. Alan Greenspan)
:wq
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