This file is complete.def, from which is created complete.c.
It implements the builtins "complete" and "compgen" in Bash.

Copyright (C) 1999 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

Bash 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 2, or (at your option) any later
version.

Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.

$PRODUCES complete.c

$BUILTIN complete
$DEPENDS_ON PROGRAMMABLE_COMPLETION
$FUNCTION complete_builtin
$SHORT_DOC complete [-abcdefjkvu] [-pr] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [name ...]
For each NAME, specify how arguments are to be completed.
If the -p option is supplied, or if no options are supplied, existing
completion specifications are printed in a way that allows them to be
reused as input.  The -r option removes a completion specification for
each NAME, or, if no NAMEs are supplied, all completion specifications.
$END

#include <config.h>

#include <stdio.h>

#include "../bashtypes.h"

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "../bashansi.h"

#include "../shell.h"
#include "../builtins.h"
#include "../pcomplete.h"

#include "common.h"
#include "bashgetopt.h"

#define STRDUP(x)       ((x) ? savestring (x) : (char *)NULL)

static int remove_cmd_completions ();

static void print_all_completions ();
static int print_cmd_completions ();

static char *Aarg, *Garg, *Warg, *Parg, *Sarg, *Xarg, *Farg, *Carg;

static struct _compacts {
  char *actname;
  int actflag;
  int actopt;
} compacts[] = {
  { "alias",     CA_ALIAS,     'a' },
  { "arrayvar",  CA_ARRAYVAR,   0 },
  { "binding",   CA_BINDING,    0 },
  { "builtin",   CA_BUILTIN,   'b' },
  { "command",   CA_COMMAND,   'c' },
  { "directory", CA_DIRECTORY, 'd' },
  { "disabled",  CA_DISABLED,   0 },
  { "enabled",   CA_ENABLED,    0 },
  { "export",    CA_EXPORT,    'e' },
  { "file",      CA_FILE,      'f' },
  { "function",  CA_FUNCTION,   0 },
  { "helptopic", CA_BUILTIN,  0 },	/* for now */
  { "hostname",  CA_HOSTNAME,   0 },
  { "job",       CA_JOB,       'j' },
  { "keyword",   CA_KEYWORD,   'k' },
  { "running",   CA_RUNNING,    0 },
  { "setopt",    CA_SETOPT,     0 },
  { "shopt",     CA_SHOPT,      0 },
  { "signal",    CA_SIGNAL,     0 },
  { "stopped",   CA_STOPPED,    0 },
  { "user",      CA_USER,      'u' },
  { "variable",  CA_VARIABLE,  'v' },
  { (char *)NULL, 0, 0 },
};

static int
find_compact (name)
     char *name;
{
  register int i;

  for (i = 0; compacts[i].actname; i++)
    if (STREQ (name, compacts[i].actname))
      return i;
  return -1;
}

/* Build the actions from the options specified in LIST.  ACTP is a pointer
   to an unsigned long in which to place the bitmap of actions.  PP, if
   non-null, gets 1 if -p is supplied; RP, if non-null, gets 1 if -r is
   supplied.  If either is null, the corresponding option generates an
   error.  This also sets variables corresponding to options that take
   arguments as a side effect; the caller should ensure that those variables
   are set to NULL before calling build_actions.  Return value:
   	EX_USAGE = bad option
   	EXECUTION_SUCCESS = some options supplied
   	EXECUTION_FAILURE = no options supplied
*/

static int
build_actions (list, pp, rp, actp)
     WORD_LIST *list;
     int *pp, *rp;
     unsigned long *actp;
{
  int opt, ind, pflag, rflag, opt_given;
  unsigned long acts;

  acts = (unsigned long)0L;
  opt_given = 0;

  reset_internal_getopt ();
  while ((opt = internal_getopt (list, "abcdefjkpruvA:G:W:P:S:X:F:C:")) != -1)
    {
      opt_given = 1;
      switch (opt)
	{
	case 'r':
	  if (rp)
	    {
	      *rp = 1;
	      break;
	    }
	  else
	    {
	      builtin_error ("illegal option: -r");
	      builtin_usage ();
	      return (EX_USAGE);
	    }

	case 'p':
	  if (pp)
	    {
	      *pp = 1;
	      break;
	    }
	  else
	    {
	      builtin_error ("illegal option: -p");
	      builtin_usage ();
	      return (EX_USAGE);
	    }

	case 'a':
	  acts |= CA_ALIAS;
	  break;
	case 'b':
	  acts |= CA_BUILTIN;
	  break;
	case 'c':
	  acts |= CA_COMMAND;
	  break;
	case 'd':
	  acts |= CA_DIRECTORY;
	  break;
	case 'e':
	  acts |= CA_EXPORT;
	  break;
	case 'f':
	  acts |= CA_FILE;
	  break;
	case 'j':
	  acts |= CA_JOB;
	  break;
	case 'k':
	  acts |= CA_KEYWORD;
	  break;
	case 'u':
	  acts |= CA_USER;
	  break;
	case 'v':
	  acts |= CA_VARIABLE;
	  break;
	case 'A':
	  ind = find_compact (list_optarg);
	  if (ind < 0)
	    {
	      builtin_error ("%s: invalid action name", list_optarg);
	      return (EX_USAGE);
	    }
	  acts |= compacts[ind].actflag;
	  break;
	case 'C':
	  Carg = list_optarg;
	  break;
	case 'F':
	  Farg = list_optarg;
	  break;
	case 'G':
	  Garg = list_optarg;
	  break;
	case 'P':
	  Parg = list_optarg;
	  break;
	case 'S':
	  Sarg = list_optarg;
	  break;
	case 'W':
	  Warg = list_optarg;
	  break;
	case 'X':
	  Xarg = list_optarg;
	  break;
	default:
	  builtin_usage ();
	  return (EX_USAGE);
	}
    }

  *actp = acts;
  return (opt_given ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
}

/* Add, remove, and display completion specifiers. */
int
complete_builtin (list)
     WORD_LIST *list;
{
  int opt_given, pflag, rflag, rval;
  unsigned long acts;
  char *cmd;
  COMPSPEC *cs;

  if (list == 0)
    {
      print_all_completions ();
      return (EXECUTION_SUCCESS);
    }

  opt_given = pflag = rflag = 0;
  acts = (unsigned long)0L;
  Aarg = Garg = Warg = Parg = Sarg = Xarg = Farg = Carg = (char *)NULL;
  cs = (COMPSPEC *)NULL;

  /* Build the actions from the arguments.  Also sets the [A-Z]arg variables
     as a side effect if they are supplied as options. */
  rval = build_actions (list, &pflag, &rflag, &acts);
  if (rval == EX_USAGE)
    return (rval);
  opt_given = rval != EXECUTION_FAILURE;

  list = loptend;

  /* -p overrides everything else */
  if (pflag || (list == 0 && opt_given == 0))
    {
      if (list == 0)
	{
	  print_all_completions ();
	  return (EXECUTION_SUCCESS);
	}
      return (print_cmd_completions (list));
    }

  /* next, -r overrides everything else. */
  if (rflag)
    {
      if (list == 0)
	{
	  clear_progcomps ();
	  return (EXECUTION_SUCCESS);
	}
      return (remove_cmd_completions (list));
    }

  if (list == 0 && opt_given)
    {
      builtin_usage ();
      return (EX_USAGE);
    }

  /* If we get here, we need to build a compspec and add it for each
     remaining argument. */
  cs = alloc_compspec ();
  cs->actions = acts;

  cs->globpat = STRDUP (Garg);
  cs->words = STRDUP (Warg);
  cs->prefix = STRDUP (Parg);
  cs->suffix = STRDUP (Sarg);
  cs->funcname = STRDUP (Farg);
  cs->command = STRDUP (Carg);
  cs->filterpat = STRDUP (Xarg);

  for (rval = EXECUTION_SUCCESS ; list; list = list->next)
    {
      /* Add CS as the compspec for the specified commands. */
      cmd = list->word->word;
      if (add_progcomp (cmd, cs) == 0)
        rval = EXECUTION_FAILURE;
    }

  return (rval);
}

static int
remove_cmd_completions (list)
     WORD_LIST *list;
{
  WORD_LIST *l;
  int ret;

  for (ret = EXECUTION_SUCCESS, l = list; l; l = l->next)
    {
      if (remove_progcomp (l->word->word) == 0)
	{
	  builtin_error ("%s: no completion specification", l->word->word);
	  ret = EXECUTION_FAILURE;
	}
    }
  return ret;
}

#define SQPRINTARG(a, f) \
  do { \
    if (a) \
      { \
      	x = single_quote (a); \
	printf ("%s %s ", f, x); \
	free (x); \
      } \
  } while (0)

#define PRINTARG(a, f) \
  do { \
    if (a) \
      printf ("%s %s ", f, a); \
  } while (0)

#define PRINTOPT(a, f) \
  do { \
    if (acts & a) \
      printf ("%s ", f); \
  } while (0)

#define PRINTACT(a, f) \
  do { \
    if (acts & a) \
      printf ("-A %s ", f); \
  } while (0)

static void
print_one_completion (cmd, cs)
     char *cmd;
     COMPSPEC *cs;
{
  unsigned long acts;
  char *x;

  printf ("complete ");

  acts = cs->actions;

  /* simple flags first */
  PRINTOPT (CA_ALIAS, "-a");
  PRINTOPT (CA_BUILTIN, "-b");
  PRINTOPT (CA_COMMAND, "-c");
  PRINTOPT (CA_DIRECTORY, "-d");
  PRINTOPT (CA_EXPORT, "-e");
  PRINTOPT (CA_FILE, "-f");
  PRINTOPT (CA_KEYWORD, "-k");
  PRINTOPT (CA_JOB, "-j");
  PRINTOPT (CA_USER, "-u");
  PRINTOPT (CA_VARIABLE, "-v");

  /* now the rest of the actions */
  PRINTACT (CA_ARRAYVAR, "arrayvar");
  PRINTACT (CA_BINDING, "binding");
  PRINTACT (CA_DISABLED, "disabled");
  PRINTACT (CA_ENABLED, "enabled");
  PRINTACT (CA_FUNCTION, "function");
  PRINTACT (CA_HELPTOPIC, "helptopic");
  PRINTACT (CA_HOSTNAME, "hostname");
  PRINTACT (CA_RUNNING, "running");
  PRINTACT (CA_SETOPT, "setopt");
  PRINTACT (CA_SHOPT, "shopt");
  PRINTACT (CA_SIGNAL, "signal");
  PRINTACT (CA_STOPPED, "stopped");

  /* now the rest of the arguments */

  /* arguments that require quoting */
  SQPRINTARG (cs->globpat, "-G");
  SQPRINTARG (cs->words, "-W");
  SQPRINTARG (cs->prefix, "-P");
  SQPRINTARG (cs->suffix, "-S");
  SQPRINTARG (cs->filterpat, "-X");

  /* simple arguments that don't require quoting */
  PRINTARG (cs->funcname, "-F");
  PRINTARG (cs->command, "-C");

  printf ("%s\n", cmd);
}

static void
print_all_completions ()
{
  print_all_compspecs (print_one_completion);
}

static int
print_cmd_completions (list)
     WORD_LIST *list;
{
  WORD_LIST *l;
  COMPSPEC *cs;
  int ret;

  for (ret = EXECUTION_SUCCESS, l = list; l; l = l->next)
    {
      cs = find_compspec (l->word->word);
      if (cs)
        print_one_completion (l->word->word, cs);
      else
	{
	  builtin_error ("%s: no completion specification", l->word->word);
	  ret = EXECUTION_FAILURE;
	}
    }
  return (ret);
}

$BUILTIN compgen
$DEPENDS_ON PROGRAMMABLE_COMPLETION
$FUNCTION compgen_builtin
$SHORT_DOC compgen [-abcdefjkvu] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [word]
Display the possible completions depending on the options.  Intended
to be used from within a shell function generating possible completions.
If the optional WORD argument is supplied, matches against WORD are
generated.
$END

int
compgen_builtin (list)
     WORD_LIST *list;
{
  int rval;
  unsigned long acts;
  COMPSPEC *cs;
  STRINGLIST *sl;
  char *word;

  if (list == 0)
    return (EXECUTION_SUCCESS);

  acts = (unsigned long)0L;
  Aarg = Garg = Warg = Parg = Sarg = Xarg = Farg = Carg = (char *)NULL;
  cs = (COMPSPEC *)NULL;

  /* Build the actions from the arguments.  Also sets the [A-Z]arg variables
     as a side effect if they are supplied as options. */
  rval = build_actions (list, (int *)NULL, (int *)NULL, &acts);
  if (rval == EX_USAGE)
    return (rval);
  if (rval == EXECUTION_FAILURE)
    return (EXECUTION_SUCCESS);

  list = loptend;

  word = (list && list->word) ? list->word->word : "";

  if (Farg)
    internal_warning ("compgen: -F option may not work as you expect");
  if (Carg)
    internal_warning ("compgen: -C option may not work as you expect");

  /* If we get here, we need to build a compspec and evaluate it. */
  cs = alloc_compspec ();
  cs->actions = acts;
  cs->refcount = 1;

  cs->globpat = STRDUP (Garg);
  cs->words = STRDUP (Warg);
  cs->prefix = STRDUP (Parg);
  cs->suffix = STRDUP (Sarg);
  cs->funcname = STRDUP (Farg);
  cs->command = STRDUP (Carg);
  cs->filterpat = STRDUP (Xarg);

  rval = EXECUTION_FAILURE;
  sl = gen_compspec_completions (cs, "compgen", word, 0, 0);
  if (sl)
    {
      if (sl->list)
	{
	  rval = EXECUTION_SUCCESS;
	  print_stringlist (sl, (char *)NULL);
	}
      free_stringlist (sl);
    }

  free_compspec (cs);
  return (rval);
}
