One-line output for print_level=1

[PierreMartinon]

Display some basic information:
Satus - Objective - Constraints - iterations ?

[joseph-gergaud]

What do you mean exactly ?

[PierreMartinon]

Hi @joseph-gergaud !

I would like ipopt to display only one line of output, typically the success / failure and maybe the objective.

Currently we have this

julia> solve(ocp,print_level=0);

julia> solve(ocp,print_level=1);

julia> solve(ocp,print_level=2);

julia> solve(ocp,print_level=3);
Total number of variables............................:      404
                     variables with only lower bounds:      202
                variables with lower and upper bounds:        0
                     variables with only upper bounds:        0
Total number of equality constraints.................:      203
Total number of inequality constraints...............:        0
        inequality constraints with only lower bounds:        0
   inequality constraints with lower and upper bounds:        0
        inequality constraints with only upper bounds:        0


Number of Iterations....: 9

                                   (scaled)                 (unscaled)
Objective...............:   3.1303695485806754e-01    3.1303695485806754e-01
Dual infeasibility......:   4.4408920985006262e-16    4.4408920985006262e-16
Constraint violation....:   2.8779752019036930e-12    2.8779752019036930e-12
Variable bound violation:   9.7032585134461507e-09    9.7032585134461507e-09
Complementarity.........:   1.5503759072192753e-11    1.5503759072192753e-11
Overall NLP error.......:   1.5503759072192753e-11    1.5503759072192753e-11


Number of objective function evaluations             = 10
Number of objective gradient evaluations             = 10
Number of equality constraint evaluations            = 10
Number of inequality constraint evaluations          = 0
Number of equality constraint Jacobian evaluations   = 10
Number of inequality constraint Jacobian evaluations = 0
Number of Lagrangian Hessian evaluations             = 9
Total seconds in IPOPT                               = 0.015

EXIT: Optimal Solution Found.

For whatever reason print_level=1,2 gives no output, same as print_level=0. I would like for instance print_level=1 to print only the last line.

[PierreMartinon]

I'll try to print the internal_msg recovered by NLPModelsIpopt for print_level=1.
For print_level=2 we could add the objective, contraints violation and iterations.