faux/tinyrl/tinyrl.h

 /**
\ingroup tinyrl
\defgroup tinyrl_class tinyrl
@{

\brief This class provides instances which are capable of handling user input
from a CLI in a "readline" like fashion.

*/
#ifndef _tinyrl_tinyrl_h
#define _tinyrl_tinyrl_h

#include <stdio.h>
#include "lub/types.h"
#include "lub/c_decl.h"
#include "tinyrl/history.h"

_BEGIN_C_DECL

typedef struct _tinyrl tinyrl_t;
typedef enum
{
    /**
     * no possible completions were found
     */
    TINYRL_NO_MATCH = 0,
    /**
     * the provided string was already an exact match
     */
    TINYRL_MATCH,
    /**
     * the provided string was ambiguous and produced
     * more than one possible completion
     */
    TINYRL_AMBIGUOUS,
    /**
     * the provided string was unambiguous and a 
     * completion was performed
     */
    TINYRL_COMPLETED_MATCH,
    /**
     * the provided string was ambiguous but a partial
     * completion was performed.
     */
    TINYRL_COMPLETED_AMBIGUOUS,
    /**
     * the provided string was an exact match for one
     * possible value but there are other exetensions
     * of the string available.
     */
    TINYRL_MATCH_WITH_EXTENSIONS
} tinyrl_match_e;

/* virtual methods */
typedef char  *
    tinyrl_compentry_func_t(tinyrl_t   *instance,
                            const char *text,
                            unsigned    offset,
                            unsigned    state);
typedef int
    tinyrl_hook_func_t(tinyrl_t *instance);

typedef char **
    tinyrl_completion_func_t(tinyrl_t   *instance,
                             const char *text, 
                             unsigned    start,
                             unsigned    end);
/**
 * \return
 * - BOOL_TRUE if the action associated with the key has
 *   been performed successfully
 * - BOOL_FALSE if the action was not successful
 */
typedef bool_t
    tinyrl_key_func_t(tinyrl_t *instance,
                      int       key);


/* exported functions */
extern tinyrl_t *
    tinyrl_new(FILE                     *instream,
               FILE                     *outstream,
               unsigned                  stifle,
               tinyrl_completion_func_t *complete_fn);
               
/*lint -esym(534,tinyrl_printf)  Ignoring return value of function */
extern int
    tinyrl_printf(const tinyrl_t *instance,
                  const char     *fmt,
                  ...);

extern void
    tinyrl_delete(tinyrl_t *instance);

extern tinyrl_history_t *
    tinyrl__get_history(const tinyrl_t *instance);

extern const char *
    tinyrl__get_prompt(const tinyrl_t *instance);

extern void
    tinyrl_done(tinyrl_t *instance);

extern void
    tinyrl_completion_over(tinyrl_t *instance);

extern void
    tinyrl_completion_error_over(tinyrl_t *instance);

extern bool_t
    tinyrl_is_completion_error_over(const tinyrl_t *instance);

extern void *
    tinyrl__get_context(const tinyrl_t *instance);

/**
 * This operation returns the current line in use by the tinyrl instance
 * NB. the pointer will become invalid after any further operation on the 
 * instance.
 */
extern const char *
    tinyrl__get_line(const tinyrl_t *instance);

extern void
    tinyrl__set_istream(tinyrl_t *instance,
                        FILE     *istream);

extern bool_t
    tinyrl__get_isatty(const tinyrl_t *instance);

extern FILE *
    tinyrl__get_istream(const tinyrl_t *instance);

extern FILE *
    tinyrl__get_ostream(const tinyrl_t *instance);

extern char *
    tinyrl_readline(tinyrl_t   *instance,
                    const char *prompt,
                    void       *context);

extern char *
    tinyrl_forceline(tinyrl_t   *instance,
                     const char *prompt,
                     void       *context,
                     const char *line);

extern bool_t
    tinyrl_bind_key(tinyrl_t          *instance,
                    int                key,
                    tinyrl_key_func_t *fn);
extern void
    tinyrl_delete_matches(char **instance);
extern char **
    tinyrl_completion(tinyrl_t                *instance,
                      const char              *line,
                      unsigned                 start,
                      unsigned                 end,
                      tinyrl_compentry_func_t *generator);
extern void
    tinyrl_crlf(const tinyrl_t *instance);
extern void
    tinyrl_ding(const tinyrl_t *instance);

extern void
    tinyrl_reset_line_state(tinyrl_t *instance);

extern bool_t
    tinyrl_insert_text(tinyrl_t   *instance,
                       const char *text);
extern void
    tinyrl_delete_text(tinyrl_t *instance,
                       unsigned  start,
                       unsigned  end);
extern void
    tinyrl_redisplay(tinyrl_t *instance);

extern void
    tinyrl_replace_line(tinyrl_t *instance,
                        const char    *text,
                        int            clear_undo);

/**
 * Complete the current word in the input buffer, displaying
 * a prompt to clarify any abiguity if necessary.
 *
 * \return
 * - the type of match performed.
 * \post
 * - If the current word is ambiguous then a list of 
 *   possible completions will be displayed.
 */
extern tinyrl_match_e
    tinyrl_complete(tinyrl_t *instance);
    
/**
 * Complete the current word in the input buffer, displaying
 * a prompt to clarify any abiguity or extra extensions if necessary.
 *
 * \return
 * - the type of match performed.
 * \post
 * - If the current word is ambiguous then a list of 
 *   possible completions will be displayed.
 * - If the current word is complete but there are extra
 *   completions which are an extension of that word then
 *   a list of these will be displayed.
 */                        
extern tinyrl_match_e
    tinyrl_complete_with_extensions(tinyrl_t *instance);

/**
 * Disable echoing of input characters when a line in input.
 * 
 */                    
extern void
    tinyrl_disable_echo(
         /** 
          * The instance on which to operate
          */
         tinyrl_t *instance,
         /**
          * The character to display instead of a key press.
          *
          * If this has the special value '/0' then the insertion point will not 
          * be moved when keys are pressed.
          */
          char echo_char
    ); 
/**
 * Enable key echoing for this instance. (This is the default behaviour)
 */
extern void
    tinyrl_enable_echo(
        /** 
         * The instance on which to operate
         */
        tinyrl_t *instance
    );
/**
 * Indicate whether the current insertion point is quoting or not
 */
extern bool_t 
    tinyrl_is_quoting(
        /** 
         * The instance on which to operate
         */
        const tinyrl_t *instance
    );
/**
 * Limit maximum line length
 */
extern void
    tinyrl_limit_line_length(
        /** 
         * The instance on which to operate
         */
	tinyrl_t *instance,
        /** 
         * The length to limit to (0) is unlimited
         */
        unsigned length
    );
    
_END_C_DECL

#endif /* _tinyrl_tinyrl_h */
/** @} tinyrl_tinyrl */