Actual source code: select.c

petsc-3.6.0 2015-06-09
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  2: #include <petscsys.h>              /*I  "petscsys.h"  I*/

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

  9:      Collective on MPI_Comm

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

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

 22:      Level: developer

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

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

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

 35: @*/
 36: PetscErrorCode  PetscPopUpSelect(MPI_Comm comm,const char *machine,const char *title,int n,const char **choices,int *choice)
 37: {
 38:   PetscMPIInt    rank;
 39:   int            i,rows = n + 2;
 40:   size_t         cols,len;
 41:   char           buffer[2048],display[256],geometry[64];
 42:   FILE           *fp;

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

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

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

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