Actual source code: select.c

      1: #define PETSC_DLL
     2:  #include petsc.h
     3:  #include petscsys.h

      7: /*@C
      8:      PetscPopUpSelect - Pops up a windows with a list of choices; allows one to be chosen

     10:      Collective on MPI_Comm

     12:      Input Parameters:
     13: +    comm - MPI communicator, all processors in communicator must call this but input
     14:             from first communicator is the only one that is used
     15: .    machine - location to run popup program or PETSC_NULL
     16: .    title - text to display above choices
     17: .    n - number of choices
     18: -    choices - array of strings

     20:      Output Parameter:
     21: .    choice - integer indicating which one was selected

     23:      Level: developer

     25:      Notes:
     26:        Uses DISPLAY variable or -display option to determine where it opens the window

     28:        Currently this uses a file ~username/.popuptmp to pass the value back from the
     29:        xterm; hence this program must share a common file system with the machine
     30:        parameter passed in below.

     32:    Concepts: popup
     33:    Concepts: user selection
     34:    Concepts: menu

     36: @*/
     37: PetscErrorCode PETSC_DLLEXPORT PetscPopUpSelect(MPI_Comm comm,char *machine,char *title,int n,char **choices,int *choice)
     38: {
     39:   PetscMPIInt    rank;
     40:   int            i,rows = n + 2;
     41:   size_t         cols,len;
     42:   char           buffer[2048],display[256],geometry[64];
     43:   FILE           *fp;

     47:   if (!title) SETERRQ(PETSC_ERR_ARG_NULL,"Must pass in a title line");
     48:   if (n < 1) SETERRQ(PETSC_ERR_ARG_WRONG,"Must pass in at least one selection");
     49:   if (n == 1) {*choice = 0; return(0);}

     51:   PetscStrlen(title,&cols);
     52:   for (i=0; i<n; i++) {
     53:     PetscStrlen(choices[i],&len);
     54:     cols = PetscMax(cols,len);
     55:   }
     56:   cols += 4;
     57:   sprintf(geometry," -geometry %dx%d ",(int)cols,rows);
     58:   PetscStrcpy(buffer,"xterm -bw 100 -bd blue +sb -display ");
     59:   PetscGetDisplay(display,128);
     60:   PetscStrcat(buffer,display);
     61:   PetscStrcat(buffer,geometry);
     62:   PetscStrcat(buffer," -e ${PETSC_DIR}/bin/popup ");

     64:   PetscStrcat(buffer,"\"");
     65:   PetscStrcat(buffer,title);
     66:   PetscStrcat(buffer,"\" ");
     67:   for (i=0; i<n; i++) {
     68:     PetscStrcat(buffer,"\"");
     69:     PetscStrcat(buffer,choices[i]);
     70:     PetscStrcat(buffer,"\" ");
     71:   }
     72: #if defined(PETSC_HAVE_POPEN)
     73:   PetscPOpen(comm,machine,buffer,"r",&fp);
     74:   PetscPClose(comm,fp);
     75:   MPI_Comm_rank(comm,&rank);
     76:   if (!rank) {
     77:     FILE *fd;

     79:     PetscFOpen(PETSC_COMM_SELF,"${HOMEDIRECTORY}/.popuptmp","r",&fd);
     80:     fscanf(fd,"%d",choice);
     81:     *choice -= 1;
     82:     if (*choice < 0 || *choice > n-1) SETERRQ1(PETSC_ERR_ARG_OUTOFRANGE,"Selection %d out of range",*choice);
     83:     PetscPClose(PETSC_COMM_SELF,fd);
     84:   }
     85: #else
     86:   SETERRQ(PETSC_ERR_SUP_SYS,"Cannot run external programs on this machine");
     87: #endif
     88:   MPI_Bcast(choice,1,MPI_INT,0,comm);
     89:   return(0);
     90: }