completion.c

/*
** completion.c
**
** Made by (Matthieu Lucotte)
** Login   <gounter@users.sourceforge.net>
**
** Started on  Sun Oct  7 01:43:23 2001 Matthieu Lucotte
** Last update Mon Sep  1 22:57:07 2003
*/

#include "zssh.h"
#include <readline/readline.h>
#include <readline/history.h>

#ifdef HAVE_LIBREADLINE

/* for readline < 4.2 we have to use username_completion_function
 *                4.2 we have to use rl_username_completion_function
 * and so on ...
 */
#ifdef HAVE_READLINE_4_2_OR_GREATER
#define RL_USERNAME_COMPLETION_FUNCTION rl_username_completion_function
#define RL_FILENAME_COMPLETION_FUNCTION rl_filename_completion_function
#define RL_COMPLETION_MATCHES           rl_completion_matches

#else /* readline < 4.2 */

#define RL_USERNAME_COMPLETION_FUNCTION username_completion_function
#define RL_FILENAME_COMPLETION_FUNCTION filename_completion_function
#define RL_COMPLETION_MATCHES           completion_matches
#endif


/* **************************************************************** */
/*                                                                  */
/*                  Interface to Readline Completion                */
/*                                                                  */
/* **************************************************************** */


/* Tell the GNU Readline library how to complete.  We want to try to complete
   on command names if this is the first word in the line, or on filenames
   if not. */
void initialize_readline(void)
{
#ifdef DEBUG
	printf("Using readline library version: %s\n", rl_library_version);
#endif
	/* Allow conditional parsing of the ~/.inputrc file. */
	rl_readline_name = "zssh";

	/* inhibit default filename completion
	   so that if zssh_completion() fails nothing is completed */
	rl_completion_entry_function = fake_generator;
	/* Tell the completer that we want a crack first. */
	rl_attempted_completion_function = (rl_completion_func_t *)zssh_completion;

}

/* Attempt to complete on the contents of TEXT.  START and END bound the
   region of rl_line_buffer that contains the word to complete.  TEXT is
   the word to complete.  We can use the entire contents of rl_line_buffer
   in case we want to do some simple parsing.  Return the array of matches,
   or NULL if there aren't any. */
char **zssh_completion(char *text, int start, int end)
{
	char         **matches;

	matches = (char **)NULL;
/*   printf("text: >%s<\n", text); */

	/* If this word is at the start of the line, then it is a command
	   to complete.  Otherwise it is the name of a file in the current
	   directory. */
	if (!start)
		matches = RL_COMPLETION_MATCHES(text, command_generator);
	else if (text[0] == '~' && !strchr(text, '/'))
		matches = RL_COMPLETION_MATCHES(text, RL_USERNAME_COMPLETION_FUNCTION);
	else
		matches = RL_COMPLETION_MATCHES(text, RL_FILENAME_COMPLETION_FUNCTION);

	return matches;
}

/* Generator function for command completion.  STATE lets us know whether
   to start from scratch; without any state (i.e. STATE == 0), then we
   start at the top of the list. */
char *command_generator(const char *text, int state)
{
	static int list_index, len;
	char         *name;

	/* If this is a new word to complete, initialize now.  This includes
	   saving the length of TEXT for efficiency, and initializing the index
	   variable to 0. */
	if (!state) {
		list_index = 0;
		len = strlen(text);
	}

	/* Return the next name which partially matches from the command list. */
	while ((name = cmdtab[list_index].name)) {
		list_index++;

		if (strncmp(name, text, len) == 0)
			return strdup(name);
	}

	/* If no names matched, then return NULL. */
	return (char *)NULL;
}

char *fake_generator(const char *text, int state)
{
	return 0;
}

#endif /* HAVE_LIBREADLINE */