Fix help output. Test it.

* include/mailutils/opt.h (MU_PARSEOPT_EXTRA_INFO)
(MU_PARSEOPT_EXIT_ERROR): New flags.
(struct mu_parseopt) <po_extra_info>: New member.
<po_exit_error>: New member.
* libmailutils/opt/help.c: Fix help output formatting.
Implement support for ARGP_HELP_FMT envvar.
* libmailutils/opt/opt.c (add_option_cache): Honor
MU_PARSEOPT_IMMEDIATE.
(parseopt_init): Initialize each member separately.

* libmailutils/tests/parseopt.c: Rewrite envvar handling.
* libmailutils/tests/Makefile.am: Add new tests.
* libmailutils/tests/testsuite.at (PARSEOPT_DEFAULT): New define.
* libmailutils/tests/parseopt00.at: Use PARSEOPT_DEFAULT.
* libmailutils/tests/parseopt01.at: Likewise.
* libmailutils/tests/parseopt02.at: Likewise.
* libmailutils/tests/parseopt03.at: Likewise.
* libmailutils/tests/parseopt04.at: Likewise.
* libmailutils/tests/parseopt05.at: Likewise.
* libmailutils/tests/parseopt06.at: Likewise.
* libmailutils/tests/parseopt07.at: Likewise.
* libmailutils/tests/parseopt08.at: Likewise.
* libmailutils/tests/parseopt09.at: Likewise.
* libmailutils/tests/parseopt10.at: Likewise.
* libmailutils/tests/parseopt11.at: Likewise.
* libmailutils/tests/parseopt12.at: Likewise.
* libmailutils/tests/parseopt13.at: Likewise.
* libmailutils/tests/parseopt14.at: Likewise.
* libmailutils/tests/parseopt15.at: Likewise.
* libmailutils/tests/parseopt16.at: Likewise.
* libmailutils/tests/parseopt17.at: Likewise.
* libmailutils/tests/parseopt18.at: Likewise.
* libmailutils/tests/parseopt19.at: Likewise.
* libmailutils/tests/parseopt20.at: Likewise.
* libmailutils/tests/parseopt21.at: Likewise.
* libmailutils/tests/parseopt22.at: Likewise.
* libmailutils/tests/parseopt23.at: New test.
* libmailutils/tests/parseopt24.at: New test.
* libmailutils/tests/parseopt25.at: New test.
* libmailutils/tests/parseopt_help00.at: New test.
* libmailutils/tests/parseopt_help01.at: New test.
* libmailutils/tests/parseopt_help02.at: New test.
* libmailutils/tests/parseopt_help03.at: New test.
* libmailutils/tests/parseopt_help04.at: New test.
* libmailutils/tests/parseopt_help05.at: New test.
* libmailutils/tests/parseopt_help06.at: New test.
* libmailutils/tests/parseopt_help07.at: New test.
* libmailutils/tests/parseopt_help08.at: New test.
* libmailutils/tests/parseopt_help09.at: New test.
* libmailutils/tests/parseopt_help10.at: New test.
* libmailutils/tests/parseopt_help11.at: New test.

@@ -61,7 +61,7 @@ struct mu_option
   (!MU_OPTION_IS_OPTION(opt) && (opt)->opt_doc)
 #define MU_OPTION_IS_VALID_SHORT_OPTION(opt) \
   ((opt)->opt_short > 0 && (opt)->opt_short < 127 && \
-   mu_isalnum ((opt)->opt_short))
+   (mu_isalnum ((opt)->opt_short) || ((opt)->opt_short == '?')))
 #define MU_OPTION_IS_VALID_LONG_OPTION(opt) \
   ((opt)->opt_long != NULL)
 
@@ -97,8 +97,11 @@ struct mu_option_cache
 #define MU_PARSEOPT_BUG_ADDRESS    0x00010000
 #define MU_PARSEOPT_PACKAGE_NAME   0x00020000
 #define MU_PARSEOPT_PACKAGE_URL    0x00040000
-#define MU_PARSEOPT_DATA           0x00080000
-#define MU_PARSEOPT_HELP_HOOK      0x00100000
+#define MU_PARSEOPT_EXTRA_INFO     0x00080000
+#define MU_PARSEOPT_EXIT_ERROR     0x00100000
+#define MU_PARSEOPT_HELP_HOOK      0x00200000
+#define MU_PARSEOPT_DATA           0x00400000
+#define MU_PARSEOPT_VERSION_HOOK   0x00800000
 
 /* Reuse mu_parseopt struct initialized previously */
 #define MU_PARSEOPT_REUSE          0x80000000
@@ -116,6 +119,8 @@ struct mu_parseopt
   int po_flags;                        
 
   char *po_data;                   /* Call-specific data */
+
+  int po_exit_error;               /* Exit on error with this code */
   
   /* Informational: */
   char const *po_prog_name;
@@ -124,8 +129,10 @@ struct mu_parseopt
   char const *po_bug_address;
   char const *po_package_name;
   char const *po_package_url;
-
-  void (*po_help_hook) (FILE *stream); /* FIXME: should take mu_Stream_t ?*/
+  char const *po_extra_info;
+  
+  void (*po_help_hook) (FILE *stream); /* FIXME: should take mu_stream_t ?*/
+  void (*po_version_hook) (FILE *stream);
   
   /* Output data */
   int po_ind;                      /* Index of the next option */

@@ -19,22 +19,161 @@
 #endif
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
+#include <errno.h>
+#include <unistd.h>
 #include <mailutils/alloc.h>
 #include <mailutils/opt.h>
 #include <mailutils/cctype.h>
 #include <mailutils/nls.h>
+#include <mailutils/wordsplit.h>
+
+unsigned short_opt_col = 2;
+unsigned long_opt_col = 6;
+/*FIXME: doc_opt_col? */
+unsigned header_col = 1;
+unsigned opt_doc_col = 29;
+unsigned usage_indent = 12;
+unsigned rmargin = 79;
+
+unsigned dup_args = 0;
+unsigned dup_args_note = 1;
+
+enum usage_var_type
+  {
+    usage_var_column,
+    usage_var_bool
+  };
+
+static struct usage_var
+{
+  char *name;
+  unsigned *valptr;
+  enum usage_var_type type;
+} usage_var[] = {
+  { "short-opt-col", &short_opt_col, usage_var_column },
+  { "header-col",    &header_col,    usage_var_column },
+  { "opt-doc-col",   &opt_doc_col,   usage_var_column },
+  { "usage-indent",  &usage_indent,  usage_var_column },
+  { "rmargin",       &rmargin,       usage_var_column },
+  { "dup-args",      &dup_args,      usage_var_bool },
+  { "dup-args-note", &dup_args_note, usage_var_bool },
+  { "long-opt-col",  &long_opt_col,  usage_var_column },
+  { "doc_opt_col",   NULL,           usage_var_column },
+  { NULL }
+};
 
-#define LMARGIN 2
-#define DESCRCOLUMN 30
-#define RMARGIN 79
-#define GROUPCOLUMN 2
-#define USAGECOLUMN 13
+static void
+set_usage_var (struct mu_parseopt *po, char const *id)
+{
+  struct usage_var *p;
+  size_t len;
+  int boolval = 1;
+  
+  if (strlen (id) > 3 && memcmp (id, "no-", 3) == 0)
+    {
+      id += 3;
+      boolval = 0;
+    }
+  len = strcspn (id, "=");
+
+  for (p = usage_var; p->name; p++)
+    {
+      if (strlen (p->name) == len && memcmp (p->name, id, len) == 0)
+	{
+	  if (!p->valptr)
+	    return;
+
+	  if (p->type == usage_var_bool)
+	    {
+	      if (id[len])
+		{
+		  if (po->po_prog_name)
+		    fprintf (stderr, "%s: ", po->po_prog_name);
+		  fprintf (stderr,
+			   "error in ARGP_HELP_FMT: improper usage of [no-]%s\n",
+			   id);
+		  return;
+		}
+	      *p->valptr = boolval;
+	      return;
+	    }
+	  
+	  if (id[len])
+	    {
+	      char *endp;
+	      unsigned long val;
+	      
+	      errno = 0;
+	      val = strtoul (id + len + 1, &endp, 10);
+	      if (errno || *endp)
+		{
+		  if (po->po_prog_name)
+		    fprintf (stderr, "%s: ", po->po_prog_name);
+		  fprintf (stderr,
+			   "error in ARGP_HELP_FMT: bad value for %s\n",
+			   id);
+		}
+	      else if (val > UINT_MAX)
+		{
+		  if (po->po_prog_name)
+		    fprintf (stderr, "%s: ", po->po_prog_name);
+		  fprintf (stderr,
+			   "error in ARGP_HELP_FMT: %s value is out of range\n",
+			   id);
+		}
+	      else
+		*p->valptr = val;
+	    }
+	  else
+	    {
+	      if (po->po_prog_name)
+		fprintf (stderr, "%s: ", po->po_prog_name);
+	      fprintf (stderr,
+		       "%s: ARGP_HELP_FMT parameter requires a value\n",
+		       id);
+	      return;
+	    }
+	  return;
+	}
+    }
+
+  if (po->po_prog_name)
+    fprintf (stderr, "%s: ", po->po_prog_name);
+  fprintf (stderr,
+	   "%s: Unknown ARGP_HELP_FMT parameter\n",
+	   id);
+}
 
 static void
-indent (size_t start, size_t col)
+init_usage_vars (struct mu_parseopt *po)
+{
+  char *fmt;
+  struct mu_wordsplit ws;
+  size_t i;
+  
+  fmt = getenv ("ARGP_HELP_FMT");
+  if (!fmt)
+    return;
+  ws.ws_delim=",";
+  if (mu_wordsplit (fmt, &ws, 
+		    MU_WRDSF_DELIM | MU_WRDSF_NOVAR | MU_WRDSF_NOCMD
+		    | MU_WRDSF_WS | MU_WRDSF_SHOWERR))
+    return;
+  for (i = 0; i < ws.ws_wordc; i++)
+    {
+      set_usage_var (po, ws.ws_wordv[i]);
+    }
+
+  mu_wordsplit_free (&ws);
+}
+
+static int
+indent (int start, int col)
 {
   for (; start < col; start++)
     putchar (' ');
+  return start;
 }
 
 static void
@@ -70,6 +209,22 @@ print_option_descr (const char *descr, size_t lmargin, size_t rmargin)
 
 
 static size_t
+print_opt_arg (struct mu_option *opt, int delim)
+{
+  int w = 0;
+  if (opt->opt_flags & MU_OPTION_ARG_OPTIONAL)
+    {
+      if (delim == '=')
+	w = printf ("[=%s]", gettext (opt->opt_arg));
+      else
+	w = printf ("[%s]", gettext (opt->opt_arg));
+    }
+  else
+    w = printf ("%c%s", delim, gettext (opt->opt_arg));
+  return w;
+}
+
+static size_t
 print_option (struct mu_option **optbuf, size_t optcnt, size_t num,
 	      int *argsused)
 {
@@ -82,9 +237,11 @@ print_option (struct mu_option **optbuf, size_t optcnt, size_t num,
     {
       if (num)
 	putchar ('\n');
-      indent (0, GROUPCOLUMN);
-      print_option_descr (gettext (opt->opt_doc), GROUPCOLUMN, RMARGIN);
-      putchar ('\n');
+      if (opt->opt_doc[0])
+	{
+	  indent (0, header_col);
+	  print_option_descr (gettext (opt->opt_doc), header_col, rmargin);
+	}
       return num + 1;
     }
 
@@ -103,52 +260,51 @@ print_option (struct mu_option **optbuf, size_t optcnt, size_t num,
 	{
 	  if (w == 0)
 	    {
-	      indent (0, LMARGIN);
-	      w = LMARGIN;
+	      indent (0, short_opt_col);
+	      w = short_opt_col;
 	    }
 	  else
 	    w += printf (", ");
 	  w += printf ("-%c", optbuf[i]->opt_short);
 	  delim = ' ';
+	  if (opt->opt_arg && dup_args)
+	    w += print_opt_arg (opt, delim);
 	}
     }
-  
+
   for (i = num; i < next; i++)
     {
       if (MU_OPTION_IS_VALID_LONG_OPTION (optbuf[i]))
 	{
 	  if (w == 0)
 	    {
-	      indent (0, LMARGIN);
-	      w = LMARGIN;
+	      indent (0, short_opt_col);
+	      w = short_opt_col;
 	    }
 	  else
 	    w += printf (", ");
-	  w += printf ("--%s", optbuf[i]->opt_long);
+	  if (i == num)
+	    w = indent (w, long_opt_col);
+  	  w += printf ("--%s", optbuf[i]->opt_long);
 	  delim = '=';
+	  if (opt->opt_arg && dup_args)
+	    w += print_opt_arg (opt, delim);
 	}
     }
   
   if (opt->opt_arg)
     {
       *argsused = 1;
-      if (opt->opt_flags & MU_OPTION_ARG_OPTIONAL)
-	{
-	  if (delim == '=')
-	    w += printf ("[=%s]", gettext (opt->opt_arg));
-	  else
-	    w += printf ("[%s]", gettext (opt->opt_arg));
-	}
-      else
-	w += printf ("%c%s", delim, gettext (opt->opt_arg));
+      if (!dup_args)
+	w += print_opt_arg (opt, delim);
     }
-  if (w >= DESCRCOLUMN)
+  if (w >= opt_doc_col)
     {
       putchar ('\n');
       w = 0;
     }
-  indent (w, DESCRCOLUMN);
-  print_option_descr (gettext (opt->opt_doc), DESCRCOLUMN, RMARGIN);
+  indent (w, opt_doc_col);
+  print_option_descr (gettext (opt->opt_doc), opt_doc_col, rmargin);
 
   return next;
 }
@@ -163,9 +319,9 @@ mu_option_describe_options (struct mu_option **optbuf, size_t optcnt)
     i = print_option (optbuf, optcnt, i, &argsused);
   putchar ('\n');
 
-  if (argsused)
+  if (argsused && dup_args_note)
     {
-      print_option_descr (_("Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options."), 0, RMARGIN);
+      print_option_descr (_("Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options."), 0, rmargin);
       putchar ('\n');
     }
 }
@@ -173,6 +329,8 @@ mu_option_describe_options (struct mu_option **optbuf, size_t optcnt)
 void
 mu_program_help (struct mu_parseopt *po)
 {
+  init_usage_vars (po);
+
   printf ("%s", _("Usage:"));
   if (po->po_prog_name)
     printf (" %s", po->po_prog_name);
@@ -182,7 +340,7 @@ mu_program_help (struct mu_parseopt *po)
   putchar ('\n');
   
   if (po->po_prog_doc)
-    print_option_descr (gettext (po->po_prog_doc), 0, RMARGIN);
+    print_option_descr (gettext (po->po_prog_doc), 0, rmargin);
   putchar ('\n');
 
   mu_option_describe_options (po->po_optv, po->po_optc);
@@ -200,6 +358,8 @@ mu_program_help (struct mu_parseopt *po)
   if (po->po_package_name && po->po_package_url)
     printf (_("%s home page: <%s>\n"),
 	    po->po_package_name, po->po_package_url);
+  if (po->po_flags & MU_PARSEOPT_EXTRA_INFO)
+    print_option_descr (po->po_extra_info, 0, rmargin);
 }
 
 static struct mu_option **option_tab;
@@ -209,8 +369,22 @@ cmpidx_short (const void *a, const void *b)
 {
   unsigned const *ai = (unsigned const *)a;
   unsigned const *bi = (unsigned const *)b;
+  int ac = option_tab[*ai]->opt_short;
+  int bc = option_tab[*bi]->opt_short;
+  int d;
+  
+  if (mu_isalpha (ac))
+    {
+      if (!mu_isalpha (bc))
+	return -1;
+    }
+  else if (mu_isalpha (bc))
+    return 1;
 
-  return option_tab[*ai]->opt_short - option_tab[*bi]->opt_short;
+  d = mu_tolower (ac) - mu_tolower (bc);
+  if (d == 0)
+    d =  mu_isupper (ac) ? 1 : -1;
+  return d;
 }
   
 static int
@@ -228,7 +402,7 @@ mu_program_usage (struct mu_parseopt *po)
 {
   unsigned i;
   unsigned n;
-  char buf[RMARGIN+1];
+  char buf[rmargin+1];
   unsigned *idxbuf;
   unsigned nidx;
 
@@ -240,23 +414,25 @@ mu_program_usage (struct mu_parseopt *po)
     {									\
       buf[n] = 0;							\
       printf ("%s\n", buf);						\
-      n = USAGECOLUMN;							\
-      memset (buf, ' ', n);						\
+      n = usage_indent;						\
+      if (n) memset (buf, ' ', n);					\
     }									\
   while (0)
 #define ADDC(c)							        \
   do									\
     {									\
-      if (n == RMARGIN) FLUSH;						\
+      if (n == rmargin) FLUSH;						\
       buf[n++] = c;							\
     }									\
   while (0)
 
+  init_usage_vars (po);
+
   option_tab = optbuf;
   
   idxbuf = mu_calloc (optcnt, sizeof (idxbuf[0]));
 
-  n = snprintf (buf, sizeof buf, "%s %s ", _("Usage:"),	mu_progname);
+  n = snprintf (buf, sizeof buf, "%s %s ", _("Usage:"),	po->po_prog_name);
   
   /* Print a list of short options without arguments. */
   for (i = nidx = 0; i < optcnt; i++)
@@ -293,8 +469,10 @@ mu_program_usage (struct mu_parseopt *po)
 	  const char *arg = gettext (opt->opt_arg);
 	  size_t len = 5 + strlen (arg) + 1;
 	  
-	  if (n + len > RMARGIN) FLUSH;
-	  buf[n++] = ' ';
+	  if (n + len >= rmargin)
+	    FLUSH;
+	  else
+	    buf[n++] = ' ';
 	  buf[n++] = '[';
 	  buf[n++] = '-';
 	  buf[n++] = opt->opt_short;
@@ -320,10 +498,12 @@ mu_program_usage (struct mu_parseopt *po)
 	{
 	  struct mu_option *opt = optbuf[idxbuf[i]];
 	  const char *arg = opt->opt_arg ? gettext (opt->opt_arg) : NULL;
-	  size_t len = 3 + strlen (opt->opt_long)
+	  size_t len = 5 + strlen (opt->opt_long)
 	                 + (arg ? 1 + strlen (arg) : 0);
-	  if (n + len > RMARGIN) FLUSH;
-	  buf[n++] = ' ';
+	  if (n + len >= rmargin)
+	    FLUSH;
+	  else
+	    buf[n++] = ' ';
 	  buf[n++] = '[';
 	  buf[n++] = '-';
 	  buf[n++] = '-';
@@ -339,6 +519,30 @@ mu_program_usage (struct mu_parseopt *po)
 	}
     }
 
+  if (po->po_flags & MU_PARSEOPT_PROG_ARGS)
+    {
+      char const *p = po->po_prog_args;
+
+      if (n + 1 >= rmargin)
+	FLUSH;
+      buf[n++] = ' ';
+      
+      while (*p)
+	{
+	  size_t len = strcspn (p, "  \t\n");
+	  if (len == 0)
+	    len = 1;
+	  if (n + len >= rmargin)
+	    FLUSH;
+	  else
+	    {
+	      memcpy (buf + n, p, len);
+	      p += len;
+	      n += len;
+	    }
+	}
+    }
+
   FLUSH;
   free (idxbuf);
 }

@@ -82,19 +82,30 @@ fn_usage (struct mu_parseopt *po, struct mu_option *opt, char const *unused)
   exit (EXIT_SUCCESS);
 }
 
+static void
+fn_version (struct mu_parseopt *po, struct mu_option *opt, char const *unused)
+{
+  po->po_version_hook (stdout);
+  exit (EXIT_SUCCESS);
+}
+
 /* Default options */
 struct mu_option mu_default_options[] = {
   MU_OPTION_GROUP(""),
-  { "help",    'h', NULL, MU_OPTION_IMMEDIATE, N_("give this help list"),
+  { "help",    '?', NULL, MU_OPTION_IMMEDIATE, N_("give this help list"),
     mu_c_string, NULL, fn_help },
-  { "version", 'V', NULL, MU_OPTION_IMMEDIATE, N_("print program version"),
-    mu_c_string, NULL, /* FIXME: fn_version */ },
   { "usage",   0,   NULL, MU_OPTION_IMMEDIATE, N_("give a short usage message"),
     mu_c_string, NULL, fn_usage
   },
   MU_OPTION_END
 };
 
+struct mu_option mu_version_options[] = {
+  { "version", 'V', NULL, MU_OPTION_IMMEDIATE, N_("print program version"),
+    mu_c_string, NULL, fn_version },
+  MU_OPTION_END
+};
+
 /* Output error message */
 static void
 parse_error (struct mu_parseopt *po, char const *fmt, ...)
@@ -132,7 +143,8 @@ add_option_cache (struct mu_parseopt *po, struct mu_option *opt,
   cache->cache_opt = opt;
   cache->cache_arg = arg ? mu_strdup (arg) : NULL;
 
-  if (opt->opt_flags & MU_OPTION_IMMEDIATE)
+  if ((po->po_flags & MU_PARSEOPT_IMMEDIATE)
+       || (opt->opt_flags & MU_OPTION_IMMEDIATE))
     {
       parseopt_apply (cache, po);
       mu_option_cache_destroy (cache);
@@ -407,7 +419,7 @@ parse (struct mu_parseopt *po)
 			po->po_arg_count++;
 		      continue;
 		    }
-		  exit (EXIT_ERROR);
+		  exit (po->po_exit_error);
 		}	
 	    }
 	  else
@@ -426,7 +438,7 @@ parse (struct mu_parseopt *po)
 			po->po_arg_count++;
 		      continue;
 		    }
-		  exit (EXIT_ERROR);
+		  exit (po->po_exit_error);
 		}
 	      arg = NULL;
 	    }
@@ -442,7 +454,7 @@ parse (struct mu_parseopt *po)
 		po->po_arg_count++;
 	      continue;
 	    }
-	  exit (EXIT_ERROR);
+	  exit (po->po_exit_error);
 	}
     }
 
@@ -459,7 +471,6 @@ parseopt_init (struct mu_parseopt *po, struct mu_option **options,
   struct mu_option *opt;
   size_t i, j;
 
-  memset (po, 0, sizeof *po);
   po->po_argc = 0;
   po->po_argv = NULL;
   po->po_optc = 0;
@@ -481,8 +492,14 @@ parseopt_init (struct mu_parseopt *po, struct mu_option **options,
     po->po_package_url = NULL;
   if (!(flags & MU_PARSEOPT_PACKAGE_URL))
     po->po_data = NULL;
+  if (!(flags & MU_PARSEOPT_EXTRA_INFO))
+    po->po_extra_info = NULL;
   if (!(flags & MU_PARSEOPT_HELP_HOOK))
     po->po_help_hook = NULL;
+  if (!(flags & MU_PARSEOPT_EXIT_ERROR))
+    po->po_exit_error = EXIT_ERROR;
+  if (!(flags & MU_PARSEOPT_VERSION_HOOK))
+    po->po_version_hook = NULL;
   
   /* Count the options */
   po->po_optc = 0;
@@ -493,6 +510,10 @@ parseopt_init (struct mu_parseopt *po, struct mu_option **options,
   if (!(flags & MU_PARSEOPT_NO_STDOPT))
     for (i = 0; !MU_OPTION_IS_END (&mu_default_options[i]); i++)
       ++po->po_optc;
+
+  if (flags & MU_PARSEOPT_VERSION_HOOK)
+    for (i = 0; !MU_OPTION_IS_END (&mu_version_options[i]); i++)
+      ++po->po_optc;
   
   /* Allocate the working buffer of option pointers */
   po->po_optv = mu_calloc (po->po_optc + 1, sizeof (*po->po_optv));
@@ -512,6 +533,10 @@ parseopt_init (struct mu_parseopt *po, struct mu_option **options,
   if (!(flags & MU_PARSEOPT_NO_STDOPT))
     for (i = 0; !MU_OPTION_IS_END (&mu_default_options[i]); i++, j++)
       po->po_optv[j] = &mu_default_options[i];
+
+  if (flags & MU_PARSEOPT_VERSION_HOOK)
+    for (i = 0; !MU_OPTION_IS_END (&mu_version_options[i]); i++, j++)
+      po->po_optv[j] = &mu_version_options[i];
   
   po->po_optv[j] = NULL;
 
@@ -532,6 +557,16 @@ parseopt_init (struct mu_parseopt *po, struct mu_option **options,
 	    start = sort_group (po->po_optv, start);
 	}
     }
+
+  po->po_ind = 0;
+  po->po_opterr = 0;
+  po->po_optlist = NULL;
+  po->po_cur = NULL;
+  po->po_chr = 0;
+  po->po_arg_start = 0;
+  po->po_arg_count = 0;
+  po->po_permuted = 0;
+  
   return 0;
 }
 

@@ -127,6 +127,21 @@ TESTSUITE_AT = \
  parseopt20.at\
  parseopt21.at\
  parseopt22.at\
+ parseopt23.at\
+ parseopt24.at\
+ parseopt25.at\
+ parseopt_help00.at\
+ parseopt_help01.at\
+ parseopt_help02.at\
+ parseopt_help03.at\
+ parseopt_help04.at\
+ parseopt_help05.at\
+ parseopt_help06.at\
+ parseopt_help07.at\
+ parseopt_help08.at\
+ parseopt_help09.at\
+ parseopt_help10.at\
+ parseopt_help11.at\
  prop.at\
  scantime.at\
  strftime.at\

@@ -63,8 +63,51 @@ struct mu_option group_b[] = {
 
 struct mu_option *optv[] = { group_a, group_b, NULL };
 
+static void
+version_func (FILE *fp)
+{
+  fputs ("version hook called\n", fp);
+}
+
 #define S(s) ((s)?(s):"(null)")
 
+struct parseopt_param
+{
+  char *name;
+  int flag;
+  mu_c_type_t type;
+  size_t off;
+};
+
+static struct parseopt_param parseopt_param[] = {
+  { "MU_PARSEOPT_ARGV0", MU_PARSEOPT_ARGV0, mu_c_void },
+  { "MU_PARSEOPT_IGNORE_ERRORS", MU_PARSEOPT_IGNORE_ERRORS, mu_c_void },
+  { "MU_PARSEOPT_IN_ORDER", MU_PARSEOPT_IN_ORDER, mu_c_void },
+  { "MU_PARSEOPT_NO_STDOPT", MU_PARSEOPT_NO_STDOPT, mu_c_void },
+  { "MU_PARSEOPT_NO_ERREXIT", MU_PARSEOPT_NO_ERREXIT, mu_c_void },
+  { "MU_PARSEOPT_IMMEDIATE", MU_PARSEOPT_IMMEDIATE, mu_c_void },
+  { "MU_PARSEOPT_NO_SORT", MU_PARSEOPT_NO_SORT, mu_c_void },
+
+  { "MU_PARSEOPT_PROG_NAME", MU_PARSEOPT_PROG_NAME,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_prog_name) },
+  { "MU_PARSEOPT_PROG_DOC", MU_PARSEOPT_PROG_DOC,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_prog_doc) },
+  { "MU_PARSEOPT_PROG_ARGS", MU_PARSEOPT_PROG_ARGS,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_prog_args) },
+  { "MU_PARSEOPT_BUG_ADDRESS", MU_PARSEOPT_BUG_ADDRESS,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_bug_address) },
+  { "MU_PARSEOPT_PACKAGE_NAME", MU_PARSEOPT_PACKAGE_NAME,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_package_name) },
+  { "MU_PARSEOPT_PACKAGE_URL", MU_PARSEOPT_PACKAGE_URL,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_package_url) },
+  { "MU_PARSEOPT_EXTRA_INFO", MU_PARSEOPT_EXTRA_INFO,
+    mu_c_string, mu_offsetof(struct mu_parseopt, po_extra_info) },
+  { "MU_PARSEOPT_EXIT_ERROR", MU_PARSEOPT_EXIT_ERROR,
+    mu_c_int, mu_offsetof(struct mu_parseopt, po_exit_error) },
+  { "MU_PARSEOPT_VERSION_HOOK", MU_PARSEOPT_VERSION_HOOK, mu_c_void },
+  { NULL }
+};
+
 int
 main (int argc, char *argv[])
 {
@@ -79,16 +122,29 @@ main (int argc, char *argv[])
     flags = MU_PARSEOPT_DEFAULT;
   else
     {
-      if (getenv ("MU_PARSEOPT_IN_ORDER"))
-	flags |= MU_PARSEOPT_IN_ORDER;
-      if (getenv ("MU_PARSEOPT_IGNORE_ERRORS"))
-	flags |= MU_PARSEOPT_IGNORE_ERRORS;
-      if (getenv ("MU_PARSEOPT_IN_ORDER"))
-	flags |= MU_PARSEOPT_IN_ORDER;
-      if (getenv ("MU_PARSEOPT_NO_ERREXIT"))
-	flags |= MU_PARSEOPT_NO_ERREXIT;
-      if (getenv ("MU_PARSEOPT_NO_STDOPT"))
-	flags |= MU_PARSEOPT_NO_STDOPT;
+      struct parseopt_param *param;
+      for (param = parseopt_param; param->name; param++)
+	{
+	  char *val = getenv (param->name);
+	  if (val)
+	    {
+	      flags |= param->flag;
+	      if (param->type != mu_c_void)
+		{
+		  char *errmsg;
+		  int rc = mu_str_to_c (val, param->type,
+					((char*)&po + param->off),
+					&errmsg);
+		  if (rc)
+		    {
+		      fprintf (stderr, "envvar %s: %s\n",
+			       param->name, errmsg ? errmsg : mu_strerror (rc));
+		    }
+		}
+	    }
+	}
+      if (flags & MU_PARSEOPT_VERSION_HOOK)
+	po.po_version_hook = version_func;
     }
   
   rc = mu_parseopt (&po, argc, argv, optv, flags);

@@ -17,7 +17,7 @@
 AT_SETUP([empty command line])
 AT_KEYWORDS([parseopt parseopt00])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([command line without options])
 AT_KEYWORDS([parseopt parseopt_noopt parseopt01])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([short options])
 AT_KEYWORDS([parseopt parseopt_short parseopt02])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -f file -x -a -d command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([short option with argument])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_arg parseopt03])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -ffile -x -a -d command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([short option with optional argument])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_opt_arg parseopt04])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -ofile command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([short option without optional argument])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_opt_noarg parseopt05])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -o command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([incremental short option])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_incr parseopt06])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -d -d command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([short option clustering])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_cluster parseopt07])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt -xffile -dado10 command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([long options])
 AT_KEYWORDS([parseopt parseopt_long parseopt08])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --file=file --all command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([long option with argument])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_arg parseopt09])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --file file command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([long option with optional argument])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_opt_arg parseopt10])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --optional=file command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([long option without optional argument])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_opt_noarg parseopt11])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --optional command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([incremental long option])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_incr parseopt12])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --debug --debug command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([abbreviated long options])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_abbr parseopt13])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --fil=file --fin=Word command line arguments
 ],
 [0],

@@ -17,7 +17,7 @@
 AT_SETUP([ambiguous abbreviated long options])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_abbr parseopt_long_ambig parseopt14])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --fi=file --fi=Word command line arguments
 ],
 [1],

@@ -17,7 +17,7 @@
 AT_SETUP([mixed long and short options])
 AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt15.at])
 AT_CHECK([
-MU_PARSEOPT_DEFAULT=1
+PARSEOPT_DEFAULT
 parseopt --file=filename -o -xa --find word -j10 command line arguments
 ],
 [0],

@@ -15,8 +15,9 @@
 # along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
 
 AT_SETUP([option aliases])
-AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt16.at])
+AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt_alias parseopt16.at])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt -vvv
 ],
 [0],

@@ -17,6 +17,7 @@
 AT_SETUP([argument permutation])
 AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt17.at])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt more --file=file arguments follow -x -o options
 ],
 [0],

@@ -17,6 +17,7 @@
 AT_SETUP([double-dash])
 AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt_double_dash parseopt18.at])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt -x --file=foobar -- -a --optional arg
 ],
 [0],

@@ -17,6 +17,7 @@
 AT_SETUP([double-dash with permutation])
 AT_KEYWORDS([parseopt parseopt_long parseopt_short parseopt_double_dash parseopt19.at])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt -x more --file=foobar -- -a --optional arg
 ],
 [0],

@@ -17,10 +17,11 @@
 AT_SETUP([short option without required argument])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_noarg parseopt20])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt -f
 ],
 [1],
 [],
 [parseopt: option '-f' requires an argument
 ])
-AT_CLEANUP
\ No newline at end of file
+AT_CLEANUP

@@ -17,10 +17,11 @@
 AT_SETUP([long option without required argument])
 AT_KEYWORDS([parseopt parseopt_long parseopt_long_noarg parseopt21])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt --file
 ],
 [1],
 [],
 [parseopt: option '--file' requires an argument
 ])
-AT_CLEANUP
\ No newline at end of file
+AT_CLEANUP

@@ -17,10 +17,11 @@
 AT_SETUP([unrecognized option])
 AT_KEYWORDS([parseopt parseopt_short parseopt_short_unrecognized parseopt22])
 AT_CHECK([
+PARSEOPT_DEFAULT
 parseopt -X
 ],
 [1],
 [],
 [parseopt: unrecognized option '-X'
 ])
-AT_CLEANUP
\ No newline at end of file
+AT_CLEANUP

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([in order parsing])
+AT_KEYWORDS([parseopt parseopt_in_order parseopt23])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_IN_ORDER=1 parseopt --file=filename more -a -x arguments
+],
+[0],
+[rc=0
+file_name=filename
+opt_value=initial
+x_option=0
+a_option=0
+find_value=(null)
+d_option=0
+jobs=0
+argv:
+0: more
+1: -a
+2: -x
+3: arguments
+])
+AT_CLEANUP
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_VERSION_HOOK])
+AT_KEYWORDS([parseopt MU_PARSEOPT_VERSION_HOOK parseopt25])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_VERSION_HOOK=1 parseopt -V
+],
+[0],
+[version hook called
+])
+AT_CLEANUP

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([standard help output])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help00])
+AT_CHECK([
+PARSEOPT_DEFAULT
+parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]...
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([standard usage output])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help00])
+AT_CHECK([
+PARSEOPT_DEFAULT
+parseopt --usage
+],
+[0],
+[[Usage: parseopt [-advx?] [-f FILE] [-F VALUE] [-j N] [-o FILE] [--all]
+            [--debug] [--file=FILE] [--find=VALUE] [--help] [--jobs=N]
+            [--optional=FILE] [--usage] [--verbose]
+]])
+AT_CLEANUP

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_PROG_NAME])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help02])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_PROG_NAME=newname parseopt --help
+],
+[0],
+[[Usage: newname [OPTION]...
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_PROG_DOC])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help03])
+AT_CHECK([
+unset ARGP_HELP_FMT
+MU_PARSEOPT_PROG_DOC="Tests option parsing" parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]...
+Tests option parsing
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_PROG_ARGS])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help04])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_PROG_ARGS="SOME MORE ARGS" parseopt --help
+],
+[0],
+[Usage: parseopt [[OPTION]]... SOME MORE ARGS
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[[=FILE]]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_BUG_ADDRESS])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help05])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_BUG_ADDRESS='<gray@gnu.org>' parseopt --help
+],
+[0],
+[Usage: parseopt [[OPTION]]...
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[[=FILE]]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+Report bugs to <gray@gnu.org>.
+])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_PACKAGE_NAME and MU_PARSEOPT_PACKAGE_URL])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help06])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_PACKAGE_NAME='GNU Mailutils' MU_PARSEOPT_PACKAGE_URL='http://mailutils.org' parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]...
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+GNU Mailutils home page: <http://mailutils.org>
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([all data])
+AT_KEYWORDS([parseopt parseopt_help parseopt_help07])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_PROG_DOC="Tests option parsing"\
+ MU_PARSEOPT_PROG_ARGS="SOME MORE ARGS"\ 
+ MU_PARSEOPT_BUG_ADDRESS='<gray@gnu.org>'\
+ MU_PARSEOPT_PACKAGE_NAME='GNU Mailutils'\
+ MU_PARSEOPT_PACKAGE_URL='http://mailutils.org'\
+ MU_PARSEOPT_EXTRA_INFO='General help using GNU software: <http://www.gnu.org/gethelp/>'\
+ parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]... SOME MORE ARGS
+Tests option parsing
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+Report bugs to <gray@gnu.org>.
+GNU Mailutils home page: <http://mailutils.org>
+General help using GNU software: <http://www.gnu.org/gethelp/>
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([ARGP_HELP_FMT compatibility])
+AT_KEYWORDS([parseopt parseopt_help ARGP_HELP_FMT parseopt_help08])
+AT_CHECK([
+PARSEOPT_DEFAULT
+ARGP_HELP_FMT=dup-args,no-dup-args-note,short-opt-col=1,opt-doc-col=32,header-col=10\
+ parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]...
+
+          Group A
+ -a,  --all                     no arguments to this one
+ -f FILE, --file=FILE           set file name
+ -o[FILE], --optional[=FILE]    optional argument
+ -x                             short-only option
+
+          Group B
+ -F VALUE, --find=VALUE         find VALUE
+ -d, -v, --debug, --verbose     another option
+ -j N, --jobs=N                 sets numeric value
+
+ -?,  --help                    give this help list
+      --usage                   give a short usage message
+
+]])
+AT_CLEANUP
+
+

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([ARGP_HELP_FMT usage compatibility])
+AT_KEYWORDS([parseopt parseopt_help ARGP_HELP_FMT parseopt_help09])
+AT_CHECK([
+PARSEOPT_DEFAULT
+ARGP_HELP_FMT=rmargin=62,usage-indent=1\
+ parseopt --usage
+],
+[0],
+[[Usage: parseopt [-advx?] [-f FILE] [-F VALUE] [-j N]
+ [-o FILE] [--all] [--debug] [--file=FILE] [--find=VALUE]
+ [--help] [--jobs=N] [--optional=FILE] [--usage] [--verbose]
+]])
+AT_CLEANUP

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_VERSION_HOOK usage output])
+AT_KEYWORDS([parseopt MU_PARSEOPT_VERSION_HOOK parseopt26])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_VERSION_HOOK=1 parseopt --usage
+],
+[0],
+[[Usage: parseopt [-advVx?] [-f FILE] [-F VALUE] [-j N] [-o FILE] [--all]
+            [--debug] [--file=FILE] [--find=VALUE] [--help] [--jobs=N]
+            [--optional=FILE] [--usage] [--verbose] [--version]
+]])
+AT_CLEANUP

+# This file is part of GNU Mailutils. -*- Autotest -*-
+# Copyright (C) 2016 Free Software Foundation, Inc.
+#
+# GNU Mailutils is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3, or (at
+# your option) any later version.
+#
+# GNU Mailutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
+
+AT_SETUP([MU_PARSEOPT_VERSION_HOOK help output])
+AT_KEYWORDS([parseopt MU_PARSEOPT_VERSION_HOOK help])
+AT_CHECK([
+PARSEOPT_DEFAULT
+MU_PARSEOPT_VERSION_HOOK=1 parseopt --help
+],
+[0],
+[[Usage: parseopt [OPTION]...
+
+ Group A
+  -a, --all                  no arguments to this one
+  -f, --file=FILE            set file name
+  -o, --optional[=FILE]      optional argument
+  -x                         short-only option
+
+ Group B
+  -F, --find=VALUE           find VALUE
+  -d, -v, --debug, --verbose another option
+  -j, --jobs=N               sets numeric value
+
+  -?, --help                 give this help list
+      --usage                give a short usage message
+  -V, --version              print program version
+
+Mandatory or optional arguments to long options are also mandatory or optional
+for any corresponding short options.
+
+]])
+AT_CLEANUP

@@ -57,6 +57,24 @@ AT_BANNER([Conversions])
 m4_include([strtoc.at])
 
 AT_BANNER([Command line parser])
+m4_define([PARSEOPT_DEFAULT],[
+unset ARGP_HELP_FMT
+unset MU_PARSEOPT_ARGV0
+unset MU_PARSEOPT_IGNORE_ERRORS
+unset MU_PARSEOPT_IN_ORDER
+unset MU_PARSEOPT_NO_STDOPT
+unset MU_PARSEOPT_NO_ERREXIT
+unset MU_PARSEOPT_IMMEDIATE
+unset MU_PARSEOPT_NO_SORT
+
+unset MU_PARSEOPT_PROG_NAME
+unset MU_PARSEOPT_PROG_DOC
+unset MU_PARSEOPT_PROG_ARGS
+unset MU_PARSEOPT_BUG_ADDRESS
+unset MU_PARSEOPT_PACKAGE_NAME
+unset MU_PARSEOPT_PACKAGE_URL
+])
+
 m4_include([parseopt00.at])
 m4_include([parseopt01.at])
 m4_include([parseopt02.at])
@@ -80,6 +98,23 @@ m4_include([parseopt19.at])
 m4_include([parseopt20.at])
 m4_include([parseopt21.at])
 m4_include([parseopt22.at])
+m4_include([parseopt23.at])
+m4_include([parseopt24.at])
+m4_include([parseopt25.at])
+
+AT_BANNER([Command line help output])
+m4_include([parseopt_help00.at])
+m4_include([parseopt_help01.at])
+m4_include([parseopt_help02.at])
+m4_include([parseopt_help03.at])
+m4_include([parseopt_help04.at])
+m4_include([parseopt_help05.at])
+m4_include([parseopt_help06.at])
+m4_include([parseopt_help07.at])
+m4_include([parseopt_help08.at])
+m4_include([parseopt_help09.at])
+m4_include([parseopt_help10.at])
+m4_include([parseopt_help11.at])
 
 AT_BANNER([Standard streams])
 m4_include([strin.at])