/** \file builtin.h
	Prototypes for functions for executing builtin functions.
*/

#ifndef FISH_BUILTIN_H
#define FISH_BUILTIN_H

#include <wchar.h>

#include "util.h"

enum
{
	COMMAND_NOT_BUILTIN,
	BUILTIN_REGULAR,
	BUILTIN_FUNCTION
}
;

/**
   Error message on missing argument
*/
#define BUILTIN_ERR_MISSING _( L"%ls: Expected argument\n" )

/**
   Error message on invalid combination of options
*/
#define BUILTIN_ERR_COMBO _( L"%ls: Invalid combination of options\n" )

/**
   Error message on invalid combination of options
*/
#define BUILTIN_ERR_COMBO2 _( L"%ls: Invalid combination of options,\n%ls\n" )

/**
   Error message on multiple scope levels for variables
*/
#define BUILTIN_ERR_GLOCAL _( L"%ls: Variable scope can only be one of universal, global and local\n%ls\n" )

/**
   Error message for specifying both export and unexport to set/read
*/
#define BUILTIN_ERR_EXPUNEXP _( L"%ls: Variable can't be both exported and unexported\n%ls\n" )

/**
   Error message for unknown switch
*/
#define BUILTIN_ERR_UNKNOWN	_( L"%ls: Unknown option '%ls'\n" )

/**
   Error message for invalid character in variable name
*/
#define BUILTIN_ERR_VARCHAR _( L"%ls: Invalid character '%lc' in variable name. Only alphanumerical characters and underscores are valid in a variable name.\n" )

/**
   Error message for invalid (empty) variable name
*/
#define BUILTIN_ERR_VARNAME_ZERO _( L"%ls: Variable name can not be the empty string\n" )

/**
   Error message when second argument to for isn't 'in'
*/
#define BUILTIN_FOR_ERR_IN _( L"%ls: Second argument must be 'in'\n" )

/**
   Error message when too many arguments are supplied to a builtin
*/
#define BUILTIN_ERR_TOO_MANY_ARGUMENTS _( L"%ls: Too many arguments\n" )

/**
   Stringbuffer used to represent standard output
*/
extern string_buffer_t *sb_out;

/**
   Stringbuffer used to represent standard error
*/
extern string_buffer_t *sb_err;

/**
   Kludge. Tells builtins if output is to screen
*/
extern int builtin_out_redirect;

/**
   Kludge. Tells builtins if error is to screen
*/
extern int builtin_err_redirect;


/**
   Initialize builtin data. 
*/
void builtin_init();

/**
   Destroy builtin data.
*/
void builtin_destroy();

/**
  Is there a builtin command with the given name?
*/
int builtin_exists( wchar_t *cmd );

/**
  Execute a builtin command 

  \param argv Array containing the command and parameters 
  of the builtin.  The list is terminated by a
  null pointer. This syntax resembles the syntax 
  for exec.

  \return the exit status of the builtin command
*/
int builtin_run( wchar_t **argv );

/**
  Insert all builtin names into l. These are not copies of the strings and should not be freed after use.
*/
void builtin_get_names( array_list_t *list );

/**
   Pushes a new set of input/output to the stack. The new stdin is supplied, a new set of output string_buffer_ts is created.
*/
void builtin_push_io( int stdin_fd );

/**
   Pops a set of input/output from the stack. The output string_buffer_ts are destroued, but the input file is not closed.
*/
void builtin_pop_io();


/**
   Return a one-line description of the specified builtin
*/
const wchar_t *builtin_get_desc( const wchar_t *b );


/**
   Slightly kludgy function used with 'complete -C' in order to make
   the commandline builtin operate on the string to complete instead
   of operating on whatever is to be completed.
*/
const wchar_t *builtin_complete_get_temporary_buffer();


/**
   Return the help text for the specified builtin command. Use
   non-wide characters since wide characters have some issues with
   string formating escape sequences sometimes.

   \param cmd The command for which to obtain help text
*/
char *builtin_help_get( const wchar_t *cmd );

#endif