libtecla.h

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#ifndef libtecla_h
#define libtecla_h

/*
 * Copyright (c) 2000, 2001 by Martin C. Shepherd.
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons
 * to whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
 * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * Except as contained in this notice, the name of a copyright holder
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * of the copyright holder.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>   /* FILE * */
#include <stdlib.h>  /* size_t */
#include <time.h>    /* time_t */

/*
 * The following are the three components of the libtecla version number.
 * Note that it is better to use the libtecla_version() function than these
 * macros since the macros only tell you which version of the library your
 * code was compiled against, whereas the libtecla_version() function
 * tells you which version of the shared tecla library your program is
 * actually linked to.
 */
#define TECLA_MAJOR_VER 1
#define TECLA_MINOR_VER 4
#define TECLA_MICRO_VER 0

/*.......................................................................
 * Query the version number of the tecla library.
 *
 * Input:
 *  major    int *   The major version number of the library
 *                   will be assigned to *major. This number is
 *                   only incremented when a change to the library is
 *                   made that breaks binary (shared library) and/or
 *                   compilation backwards compatibility.
 *  minor    int *   The minor version number of the library
 *                   will be assigned to *minor. This number is
 *                   incremented whenever new functions are added to
 *                   the public API.
 *  micro    int *   The micro version number of the library will be
 *                   assigned to *micro. This number is incremented
 *                   whenever internal changes are made that don't
 *                   change the public API, such as bug fixes and
 *                   performance enhancements.
 */
void libtecla_version(int *major, int *minor, int *micro);

/*-----------------------------------------------------------------------
 * The getline module provides interactive command-line input, recall
 * and editing by users at terminals. See the gl_getline(3) man page for
 * more details.
 *-----------------------------------------------------------------------*/

/*
 * Provide an opaque handle for the resource object that is defined in
 * getline.h.
 */
typedef struct GetLine GetLine;

/*
 * The following two functions are used to create and delete the
 * resource objects that are used by the gl_getline() function.
 */
GetLine *new_GetLine(size_t linelen, size_t histlen);
GetLine *del_GetLine(GetLine *gl);

/*
 * Read a line into an internal buffer of gl.
 */
char *gl_get_line(GetLine *gl, const char *prompt, const char *start_line,
		  int start_pos);

/*
 * Configure the application specific and/or user-specific behavior of
 * gl_get_line().
 */
int gl_configure_getline(GetLine *gl, const char *app_string,
			 const char *app_file, const char *user_file);

/*
 * Read a line from the network into an internal buffer of gl.
 */
char *gl_get_line_net(GetLine *gl, const char *prompt, const char *start_line,
		      int start_pos, int val);

/*
 * Return the current position of the cursor within the internal buffer,
 * and the cursor position on the terminal.
 */
int gl_is_net(GetLine *gl);
void gl_set_is_net(GetLine *gl, int is_net);
int gl_get_buff_curpos(const GetLine *gl);
int gl_place_cursor(GetLine *gl, int buff_curpos);
int gl_redisplay_line(GetLine *gl);
int gl_reset_line(GetLine *gl);
int gl_get_user_event(GetLine *gl);
void gl_reset_user_event(GetLine *gl);
const char *gl_get_key_binding_action_name(GetLine *gl, const char *keyseq);

/*-----------------------------------------------------------------------
 * The file-expansion module provides facilities for expanding ~user/ and
 * $envvar expressions, and for expanding glob-style wildcards.
 * See the ef_expand_file(3) man page for more details.
 *-----------------------------------------------------------------------*/

/*
 * ExpandFile objects contain the resources needed to expand pathnames.
 */
typedef struct ExpandFile ExpandFile;

/*
 * The following functions are used to create and delete the resource
 * objects that are used by the ef_expand_file() function.
 */
ExpandFile *new_ExpandFile(void);
ExpandFile *del_ExpandFile(ExpandFile *ef);

/*
 * A container of the following type is returned by ef_expand_file().
 */
typedef struct {
  int exists;       /* True if the files in files[] currently exist. */
                    /*  This only time that this may not be true is if */
                    /*  the input filename didn't contain any wildcards */
                    /*  and thus wasn't matched against existing files. */
                    /*  In this case the single entry in 'nfile' may not */
                    /*  refer to an existing file. */
  int nfile;        /* The number of files in files[] */
  char **files;     /* An array of 'nfile' filenames. */
} FileExpansion;

/* 
 * The ef_expand_file() function expands a specified pathname, converting
 * ~user/ and ~/ patterns at the start of the pathname to the
 * corresponding home directories, replacing $envvar with the value of
 * the corresponding environment variable, and then, if there are any
 * wildcards, matching these against existing filenames.
 *
 * If no errors occur, a container is returned containing the array of
 * files that resulted from the expansion. If there were no wildcards
 * in the input pathname, this will contain just the original pathname
 * after expansion of ~ and $ expressions. If there were any wildcards,
 * then the array will contain the files that matched them. Note that
 * if there were any wildcards but no existing files match them, this
 * is counted as an error and NULL is returned.
 *
 * The supported wildcards and their meanings are:
 *  *        -  Match any sequence of zero or more characters.
 *  ?        -  Match any single character.
 *  [chars]  -  Match any single character that appears in 'chars'.
 *              If 'chars' contains an expression of the form a-b,
 *              then any character between a and b, including a and b,
 *              matches. The '-' character looses its special meaning
 *              as a range specifier when it appears at the start
 *              of the sequence of characters.
 *  [^chars] -  The same as [chars] except that it matches any single
 *              character that doesn't appear in 'chars'.
 *
 * Wildcard expressions are applied to individual filename components.
 * They don't match across directory separators. A '.' character at
 * the beginning of a filename component must also be matched
 * explicitly by a '.' character in the input pathname, since these
 * are UNIX's hidden files.
 *
 * Input:
 *  fe         ExpandFile *  The pathname expansion resource object.
 *  path       const char *  The path name to be expanded.
 *  pathlen           int    The length of the suffix of path[] that
 *                           constitutes the filename to be expanded,
 *                           or -1 to specify that the whole of the
 *                           path string should be used.
 * Output:
 *  return  FileExpansion *  A pointer to a results container within the
 *                           given ExpandFile object. This contains an
 *                           array of the pathnames that resulted from
 *                           expanding ~ and $ expressions and from
 *                           matching any wildcards, sorted into lexical
 *                           order.
 *
 *                           This container and its contents will be
 *                           recycled on subsequent calls, so if you need
 *                           to keep the results of two successive runs,
 *                           you will either have to allocate a private
 *                           copy of the array, or use two ExpandFile
 *                           objects.
 *
 *                           On error, NULL is returned. A description
 *                           of the error can be acquired by calling the
 *                           ef_last_error() function.
 */
FileExpansion *ef_expand_file(ExpandFile *ef, const char *path, int pathlen);

/*.......................................................................
 * Print out an array of matching files.
 *
 * Input:
 *  result  FileExpansion *   The container of the sorted array of
 *                            expansions.
 *  fp               FILE *   The output stream to write to.
 *  term_width        int     The width of the terminal.
 * Output:
 *  return            int     0 - OK.
 *                            1 - Error.
 */
int ef_list_expansions(FileExpansion *result, FILE *fp, int term_width);

/*
 * The ef_last_error() function returns a description of the last error
 * that occurred in a call ef_expand_file(). Note that this message is
 * contained in an array which is allocated as part of *ef, and its
 * contents thus potentially change on every call to ef_expand_file().
 */
const char *ef_last_error(ExpandFile *ef);

/*-----------------------------------------------------------------------
 * The WordCompletion module is used for completing incomplete words, such
 * as filenames. Programs can use functions within this module to register
 * their own customized completion functions.
 *-----------------------------------------------------------------------*/

/*
 * Ambiguous completion matches are recorded in objects of the
 * following type.
 */
typedef struct WordCompletion WordCompletion;

/*
 * Create a new completion object.
 */
WordCompletion *new_WordCompletion(void);

/*
 * Delete a redundant completion object.
 */
WordCompletion *del_WordCompletion(WordCompletion *cpl);

/*.......................................................................
 * Callback functions declared and prototyped using the following macro
 * are called upon to return an array of possible completion suffixes
 * for the token that precedes a specified location in the given
 * input line. It is up to this function to figure out where the token
 * starts, and to call cpl_add_completion() to register each possible
 * completion before returning.
 *
 * Input:
 *  cpl  WordCompletion *  An opaque pointer to the object that will
 *                         contain the matches. This should be filled
 *                         via zero or more calls to cpl_add_completion().
 *  data           void *  The anonymous 'data' argument that was
 *                         passed to cpl_complete_word() or
 *                         gl_customize_completion()).
 *  line     const char *  The current input line.
 *  word_end        int    The index of the character in line[] which
 *                         follows the end of the token that is being
 *                         completed.
 * Output
 *  return          int    0 - OK.
 *                         1 - Error.
 */
#define CPL_MATCH_FN(fn) int (fn)(WordCompletion *cpl, void *data, \
                                  const char *line, int word_end)
typedef CPL_MATCH_FN(CplMatchFn);

/*.......................................................................
 * Optional callback functions declared and prototyped using the
 * following macro are called upon to return non-zero if a given
 * file, specified by its pathname, is to be included in a list of
 * completions.
 *
 * Input:
 *  data            void *  The application specified pointer which
 *                          was specified when this callback function
 *                          was registered. This can be used to have
 *                          anything you like passed to your callback.
 *  pathname  const char *  The pathname of the file to be checked to
 *                          see if it should be included in the list