1 .\" $NetBSD: editline.3,v 1.85 2015/11/03 21:36:59 christos Exp $
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75 .Nd line editor, history and tokenization functions
81 .Fn el_init "const char *prog" "FILE *fin" "FILE *fout" "FILE *ferr"
83 .Fn el_init_fd "const char *prog" "FILE *fin" "FILE *fout" "FILE *ferr" "int fdin" "int fdout" "int fderr"
85 .Fn el_end "EditLine *e"
87 .Fn el_reset "EditLine *e"
89 .Fn el_gets "EditLine *e" "int *count"
91 .Fn el_wgets "EditLine *e" "int *count"
93 .Fn el_getc "EditLine *e" "char *ch"
95 .Fn el_wgetc "EditLine *e" "wchar_t *ch"
97 .Fn el_push "EditLine *e" "const char *str"
99 .Fn el_wpush "EditLine *e" "const wchar_t *str"
101 .Fn el_parse "EditLine *e" "int argc" "const char *argv[]"
103 .Fn el_wparse "EditLine *e" "int argc" "const wchar_t *argv[]"
105 .Fn el_set "EditLine *e" "int op" "..."
107 .Fn el_wset "EditLine *e" "int op" "..."
109 .Fn el_get "EditLine *e" "int op" "..."
111 .Fn el_wget "EditLine *e" "int op" "..."
113 .Fn el_source "EditLine *e" "const char *file"
115 .Fn el_resize "EditLine *e"
117 .Fn el_cursor "EditLine *e" "int count"
119 .Fn el_line "EditLine *e"
120 .Ft const LineInfoW *
121 .Fn el_wline "EditLine *e"
123 .Fn el_insertstr "EditLine *e" "const char *str"
125 .Fn el_winsertstr "EditLine *e" "const wchar_t *str"
127 .Fn el_deletestr "EditLine *e" "int count"
129 .Fn el_wdeletestr "EditLine *e" "int count"
135 .Fn history_end "History *h"
137 .Fn history_wend "HistoryW *h"
139 .Fn history "History *h" "HistEvent *ev" "int op" "..."
141 .Fn history_w "HistoryW *h" "HistEventW *ev" "int op" "..."
143 .Fn tok_init "const char *IFS"
145 .Fn tok_winit "const wchar_t *IFS"
147 .Fn tok_end "Tokenizer *t"
149 .Fn tok_wend "TokenizerW *t"
151 .Fn tok_reset "Tokenizer *t"
153 .Fn tok_wreset "TokenizerW *t"
155 .Fn tok_line "Tokenizer *t" "const LineInfo *li" "int *argc" "const char **argv[]" "int *cursorc" "int *cursoro"
157 .Fn tok_wline "TokenizerW *t" "const LineInfoW *li" "int *argc" "const wchar_t **argv[]" "int *cursorc" "int *cursoro"
159 .Fn tok_str "Tokenizer *t" "const char *str" "int *argc" "const char **argv[]"
161 .Fn tok_wstr "TokenizerW *t" "const wchar_t *str" "int *argc" "const wchar_t **argv[]"
165 library provides generic line editing, history and tokenization functions,
166 similar to those found in
169 These functions are available in the
171 library (which needs the
174 Programs should be linked with
176 .Sh LINE EDITING FUNCTIONS
177 The line editing functions use a common data structure,
186 The wide-character functions behave the same way as their narrow
189 The following functions are available:
192 Initialize the line editor, and return a data structure
193 to be used by all other line editing functions, or
197 is the name of the invoking program, used when reading the
199 file to determine which settings to use.
204 are the input, output, and error streams (respectively) to use.
205 In this documentation, references to
207 are actually to this input/output stream combination.
211 but allows specifying file descriptors for the
213 corresponding streams, in case those were created with
216 Clean up and finish with
218 assumed to have been created with
223 Reset the tty and the parser.
224 This should be called after an error which may have upset the tty's
227 Read a line from the tty.
229 is modified to contain the number of characters read.
230 Returns the line read if successful, or
232 if no characters were read or if an error occurred.
233 If an error occurred,
237 contains the error code that caused it.
238 The return value may not remain valid across calls to
240 and must be copied if the data is to be retained.
242 Read a character from the tty.
244 is modified to contain the character read.
245 Returns the number of characters read if successful, \-1 otherwise,
248 can be inspected for the cause.
252 back onto the input stream.
253 This is used by the macro expansion mechanism.
254 Refer to the description of
259 for more information.
269 If the command is prefixed with
273 will only execute the command if
280 \-1 if the command is unknown,
281 0 if there was no error or
284 1 if the command returned an error.
287 for more information.
293 determines which parameter to set, and each operation has its
295 Returns 0 on success, \-1 on failure.
297 The following values for
299 are supported, along with the required argument list:
301 .It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)"
302 Define prompt printing function as
304 which is to return a string that contains the prompt.
305 .It Dv EL_PROMPT_ESC , Fa "char *(*f)(EditLine *)" , Fa "char c"
310 argument indicates the start/stop literal prompt character.
312 If a start/stop literal character is found in the prompt, the
314 is not printed, but characters after it are printed directly to the
315 terminal without affecting the state of the current line.
316 A subsequent second start/stop literal character ends this behavior.
317 This is typically used to embed literal escape sequences that change the
318 color/style of the terminal in the prompt.
322 Re-display the current line on the next terminal line.
323 .It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)"
324 Define right side prompt printing function as
326 which is to return a string that contains the prompt.
327 .It Dv EL_RPROMPT_ESC , Fa "char *(*f)(EditLine *)" , Fa "char c"
328 Define the right prompt printing function but with a literal escape character.
329 .It Dv EL_TERMINAL , Fa "const char *type"
330 Define terminal type of the tty to be
338 .It Dv EL_EDITOR , Fa "const char *mode"
345 .It Dv EL_SIGNAL , Fa "int flag"
350 will install its own signal handler for the following signals when
351 reading command input:
361 Otherwise, the current signal handlers will be used.
362 .It Dv EL_BIND , Fa "const char *" , Fa "..." , Dv NULL
368 for more information.
369 .It Dv EL_ECHOTC , Fa "const char *" , Fa "..." , Dv NULL
375 for more information.
376 .It Dv EL_SETTC , Fa "const char *" , Fa "..." , Dv NULL
382 for more information.
383 .It Dv EL_SETTY , Fa "const char *" , Fa "..." , Dv NULL
389 for more information.
390 .It Dv EL_TELLTC , Fa "const char *" , Fa "..." , Dv NULL
396 for more information.
397 .It Dv EL_ADDFN , Fa "const char *name" , Fa "const char *help" , \
398 Fa "unsigned char (*func)(EditLine *e, int ch)"
399 Add a user defined function,
403 which is invoked when a key which is bound to
411 is the key which caused the invocation.
415 .Bl -tag -width "CC_REDISPLAY"
417 Add a normal character.
419 End of line was entered.
423 Expecting further command input as arguments, do nothing visually.
426 .It Dv CC_REFRESH_BEEP
427 Refresh display, and beep.
429 Cursor moved, so update and perform
432 Redisplay entire input line.
433 This is useful if a key binding outputs extra information.
438 Fatal error, reset tty to known state.
440 .It Dv EL_HIST , Fa "History *(*func)(History *, int op, ...)" , \
442 Defines which history function to use, which is usually
445 should be the value returned by
447 .It Dv EL_EDITMODE , Fa "int flag"
451 editing is enabled (the default).
452 Note that this is only an indication, and does not
453 affect the operation of
455 At this time, it is the caller's responsibility to
459 to determine if editing should be enabled or not.
460 .It Dv EL_UNBUFFERED , Fa "int flag"
464 unbuffered mode is disabled (the default).
467 will return immediately after processing a single character.
468 .It Dv EL_GETCFN , Fa "int (*f)(EditLine *, char *c)"
469 Define the character reading function as
471 which is to return the number of characters read and store them in
473 This function is called internally by
477 The builtin function can be set or restored with the special function
479 .Dq Dv EL_BUILTIN_GETCFN .
480 .It Dv EL_CLIENTDATA , Fa "void *data"
483 to be associated with this EditLine structure.
484 It can be retrieved with the corresponding
487 .It Dv EL_SETFP , Fa "int fd" , Fa "FILE *fp"
512 determines which parameter to retrieve into
514 Returns 0 if successful, \-1 otherwise.
516 The following values for
518 are supported, along with actual type of
521 .It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)" , Fa "char *c"
524 to a pointer to the function that displays the prompt.
529 set it to the start/stop literal prompt character.
530 .It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)" , Fa "char *c"
533 to a pointer to the function that displays the prompt.
538 set it to the start/stop literal prompt character.
539 .It Dv EL_EDITOR , Fa "const char **n"
540 Set the name of the editor in
546 .It Dv EL_GETTC , Fa "const char *name" , Fa "void *value"
553 to the current value of that capability.
554 .It Dv EL_SIGNAL , Fa "int *s"
559 has installed private signal handlers (see
562 .It Dv EL_EDITMODE , Fa "int *c"
565 to non-zero if editing is enabled.
566 .It Dv EL_GETCFN , Fa "int (**f)(EditLine *, char *)"
567 Return a pointer to the function that read characters, which is equal to
568 .Dq Dv EL_BUILTIN_GETCFN
569 in the case of the default builtin function.
570 .It Dv EL_CLIENTDATA , Fa "void **data"
573 to the previously registered client data set by an
576 .It Dv EL_UNBUFFERED , Fa "int *c"
579 to non-zero if unbuffered mode is enabled.
580 .It Dv EL_GETFP , Fa "int fd", Fa "FILE **fp"
603 by reading the contents of
606 is called for each line in
616 for details on the format of
619 returns 0 on success and \-1 on error.
621 Must be called if the terminal size changes.
626 then this is done automatically.
627 Otherwise, it's the responsibility of the application to call
629 on the appropriate occasions.
631 Move the cursor to the right (if positive) or to the left (if negative)
634 Returns the resulting offset of the cursor from the beginning of the line.
636 Return the editing information for the current line in a
638 structure, which is defined as follows:
640 typedef struct lineinfo {
641 const char *buffer; /* address of buffer */
642 const char *cursor; /* address of cursor */
643 const char *lastchar; /* address of last character */
648 is not NUL terminated.
649 This function may be called after
653 structure pertaining to line returned by that function,
654 and from within user defined functions added with
659 into the line at the cursor.
662 is empty or won't fit, and 0 otherwise.
666 characters before the cursor.
668 .Sh HISTORY LIST FUNCTIONS
669 The history functions use a common data structure,
676 The following functions are available:
679 Initialize the history list, and return a data structure
680 to be used by all other history list functions, or
684 Clean up and finish with
686 assumed to have been created with
691 on the history list, with optional arguments as needed by the
694 is changed accordingly to operation.
695 The following values for
697 are supported, along with the required argument list:
699 .It Dv H_SETSIZE , Fa "int size"
700 Set size of history to
704 Get number of events currently in history.
706 Cleans up and finishes with
708 assumed to be created with
712 .It Dv H_FUNC , Fa "void *ptr" , Fa "history_gfun_t first" , \
713 Fa "history_gfun_t next" , Fa "history_gfun_t last" , \
714 Fa "history_gfun_t prev" , Fa "history_gfun_t curr" , \
715 Fa "history_sfun_t set" , Fa "history_vfun_t clear" , \
716 Fa "history_efun_t enter" , Fa "history_efun_t add"
717 Define functions to perform various history operations.
719 is the argument given to a function when it's invoked.
721 Return the first element in the history.
723 Return the last element in the history.
725 Return the previous element in the history.
727 Return the next element in the history.
729 Return the current element in the history.
731 Set the cursor to point to the requested element.
732 .It Dv H_ADD , Fa "const char *str"
735 to the current element of the history, or perform the
737 operation with argument
739 if there is no current element.
740 .It Dv H_APPEND , Fa "const char *str"
743 to the last new element of the history.
744 .It Dv H_ENTER , Fa "const char *str"
747 as a new element to the history, and, if necessary,
748 removing the oldest entry to keep the list to the created size.
751 has been called with a non-zero argument, the element
752 will not be entered into the history if its contents match
753 the ones of the current history element.
754 If the element is entered
756 returns 1; if it is ignored as a duplicate returns 0.
759 returns \-1 if an error occurred.
760 .It Dv H_PREV_STR , Fa "const char *str"
761 Return the closest previous event that starts with
763 .It Dv H_NEXT_STR , Fa "const char *str"
764 Return the closest next event that starts with
766 .It Dv H_PREV_EVENT , Fa "int e"
767 Return the previous event numbered
769 .It Dv H_NEXT_EVENT , Fa "int e"
770 Return the next event numbered
772 .It Dv H_LOAD , Fa "const char *file"
773 Load the history list stored in
775 .It Dv H_SAVE , Fa "const char *file"
776 Save the history list to
778 .It Dv H_SAVE_FP , Fa "FILE *fp"
779 Save the history list to the opened
783 .It Dv H_SETUNIQUE , Fa "int unique"
784 Set flag that adjacent identical event strings should not be entered
787 Retrieve the current setting if adjacent identical elements should
788 be entered into the history.
789 .It Dv H_DEL , Fa "int e"
790 Delete the event numbered
792 This function is only provided for
795 The caller is responsible for free'ing the string in the returned
800 returns \*[Gt]= 0 if the operation
803 Otherwise, \-1 is returned and
805 is updated to contain more details about the error.
807 .Sh TOKENIZATION FUNCTIONS
808 The tokenization functions use a common data structure,
815 The following functions are available:
818 Initialize the tokenizer, and return a data structure
819 to be used by all other tokenizer functions.
821 contains the Input Field Separators, which defaults to
829 Clean up and finish with
831 assumed to have been created with
834 Reset the tokenizer state.
835 Use after a line has been successfully tokenized
840 and before a new line is to be tokenized.
844 If successful, modify:
846 to contain the words,
848 to contain the number of words,
852 to contain the index of the word containing the cursor,
857 to contain the offset within
863 \-1 for an internal error,
864 1 for an unmatched single quote,
865 2 for an unmatched double quote,
867 3 for a backslash quoted
869 A positive exit code indicates that another line should be read
870 and tokenization attempted again.
876 is a NUL terminated string to tokenize.
880 .\"XXX: provide some examples
890 library first appeared in
895 .Dv CC_REFRESH_BEEP ,
897 and the readline emulation appeared in
906 library was written by
907 .An Christos Zoulas .
909 wrote this manual and implemented
911 .Dv CC_REFRESH_BEEP ,
916 implemented the readline emulation.
918 implemented wide-character support.
920 At this time, it is the responsibility of the caller to
921 check the result of the
931 should be used for further input.
934 is purely an indication of the result of the most recent