/* ISC license. */

#include <string.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/env.h>
#include <execline/execline.h>
#include "exlsn.h"

int exlsn_importas (int argc, char const **argv, char const *const *envp, exlsn_t *info)
{
  eltransforminfo_t si = ELTRANSFORMINFO_ZERO ;
  subgetopt localopt = SUBGETOPT_ZERO ;
  elsubst_t blah ;
  char const *defaultval = 0 ;
  char const *x ;
  int insist = 0 ;
  int unexport = 0 ;
  blah.var = info->vars.len ;
  blah.value = info->values.len ;

  for (;;)
  {
    int opt = subgetopt_r(argc, argv, "iuD:NnsCcd:", &localopt) ;
    if (opt < 0) break ;
    switch (opt)
    {
      case 'i' : insist = 1 ; break ;
      case 'u' : unexport = 1 ; break ;
      case 'D' : defaultval = localopt.arg ; break ;
      case 'N' : si.chomp = 0 ; break ;
      case 'n' : si.chomp = 1 ; break ;
      case 's' : si.split = 1 ; break ;
      case 'C' : si.crunch = 1 ; break ;
      case 'c' : si.crunch = 0 ; break ;
      case 'd' : si.delim = localopt.arg ; break ;
      default : return -3 ;
    }
  }
  argc -= localopt.ind ; argv += localopt.ind ;

  if ((unsigned int)argc < 2) return -3 ;
  if (!*argv[0] || el_vardupl(argv[0], info->vars.s, info->vars.len)) return -2 ;
  if (!stralloc_catb(&info->vars, argv[0], strlen(argv[0]) + 1)) return -1 ;
  x = env_get2(envp, argv[1]) ;
  if (!x)
  {
    if (insist) strerr_dienotset(100, argv[1]) ;
    x = defaultval ;
  }
  else if (unexport)
  {
    if (!stralloc_catb(&info->modifs, argv[1], strlen(argv[1]) + 1)) goto err ;
  }
  if (!x) blah.n = 0 ;
  else
  {
    int r ;
    if (!stralloc_cats(&info->values, x)) goto err ;
    r = el_transform(&info->values, blah.value, &si) ;
    if (r < 0) goto err ;
    blah.n = r ;
  }
  if (!genalloc_append(elsubst_t, &info->data, &blah)) goto err ;
  return localopt.ind + 2 ;

 err:
  info->vars.len = blah.var ;
  info->values.len = blah.value ;
  return -1 ;
}