1 .\" $NetBSD: editline.3,v 1.4 1997/01/14 04:17:23 lukem Exp $
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6 .\" This file was contributed to The NetBSD Foundation by Luke Mewburn.
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61 .Nd line editor and history functions
63 .Fd #include <histedit.h>
65 .Fn el_init "const char *prog" "FILE *fin" "FILE *fout"
67 .Fn el_end "EditLine *e"
69 .Fn el_reset "EditLine *e"
71 .Fn el_gets "EditLine *e" "int *count"
73 .Fn el_getc "EditLine *e" "char *ch"
75 .Fn el_push "EditLine *e" "const char *str"
77 .Fn el_parse "EditLine *e" "int argc" "char *argv[]"
79 .Fn el_set "EditLine *e" "int op" "..."
81 .Fn el_source "EditLine *e" "const char *file"
83 .Fn el_resize "EditLine *e"
85 .Fn el_line "EditLine *e"
87 .Fn el_insertstr "EditLine *e" "char *str"
89 .Fn el_deletestr "EditLine *e" "int count"
91 .Fn el_data_set "EditLine *e" "void *data"
93 .Fn el_data_get "EditLine *e"
97 .Fn history_end "History *h"
99 .Fn history "History *h" "int op" "..."
103 library provides generic line editing and history functions,
104 similar to those found in
107 These functions are available in the
109 library (which needs the
112 Programs should be linked with
114 .Sh LINE EDITING FUNCTIONS
115 The line editing functions use a common data structure,
122 The following functions are available:
125 Initialise the line editor, and return a data structure
126 to be used by all other line editing functions.
128 is the name of the invoking program, used when reading the
130 file to determine which settings to use.
134 are the input and output streams (respectively) to use.
135 In this documentation, references to
137 are actually to this input/output stream combination.
139 Clean up and finish with
141 assumed to have been created with
144 Reset the tty and the parser.
145 This should be called after an error which may have upset the tty's
148 Read a line from the tty.
150 is modified to contain the number of characters read.
151 Returns the line read if successful, or
153 if no characters were read or if an error occurred.
155 Read a character from the tty.
157 is modified to contain the character read.
158 Returns the number of characters read if successful, -1 otherwise.
162 back onto the input stream.
163 This is used by the macro expansion mechanism.
164 Refer to the description of
169 for more information.
179 If the command is prefixed with
183 will only execute the command if
190 -1 if the command is unknown,
191 0 if there was no error or
194 1 if the command returned an error.
197 for more information.
207 will be replaced with a NUL
216 determines which parameter to set, and each operation has its
219 The following values for
221 are supported, along with the required argument list:
223 .It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)"
224 Define prompt printing function as
226 which is to return a string that contains the prompt.
227 .It Dv EL_TERMINAL , Fa "const char *type"
228 Define terminal type of the tty to be
236 .It Dv EL_EDITOR , Fa "const char *mode"
243 .It Dv EL_SIGNAL , Fa "int flag"
248 will install its own signal handler for the following signals when
249 reading command input:
259 Otherwise, the current signal handlers will be used.
270 for more information.
271 .It Dv EL_ECHOTC , Xo
281 for more information.
292 for more information.
303 for more information.
304 .It Dv EL_TELLTC , Xo
314 for more information.
316 .Fa "const char *name" ,
317 .Fa "const char *help" ,
318 .Fa "unsigned char (*func)(EditLine *e, int ch)
320 Add a user defined function,
324 which is invoked when a key which is bound to
332 is the key which caused the invocation.
336 .Bl -tag -width "CC_REDISPLAY"
338 Add a normal character.
340 End of line was entered.
344 Expecting further command input as arguments, do nothing visually.
348 Cursor moved, so update and perform
351 Redisplay entire input line.
352 This is useful if a key binding outputs extra information.
357 Fatal error, reset tty to known state.
360 .Fa "History *(*func)(History *, int op, ...)" ,
361 .Fa "const char *ptr"
363 Defines which history function to use, which is usually
366 should be the value returned by
372 by reading the contents of
375 is called for each line in
387 for details on the format of
390 Must be called if the terminal size changes.
395 then this is done automatically.
396 Otherwise, it's the responsibility of the application to call
398 on the appropriate occasions.
400 Return the editing information for the current line in a
402 structure, which is defined as follows:
404 typedef struct lineinfo {
405 const char *buffer; /* address of buffer */
406 const char *cursor; /* address of cursor */
407 const char *lastchar; /* address of last character */
413 into the line at the cursor.
416 is empty or won't fit, and 0 otherwise.
420 characters before the cursor.
428 .Sh HISTORY LIST FUNCTIONS
429 The history functions use a common data structure,
436 The following functions are available:
439 Initialise the history list, and return a data structure
440 to be used by all other history list functions.
442 Clean up and finish with
444 assumed to have been created with
449 on the history list, with optional arguments as needed by the
451 The following values for
453 are supported, along with the required argument list:
455 .It Dv H_EVENT , Fa "int size"
456 Set size of history to
460 Cleans up and finishes with
462 assumed to be created with
468 .Fa "history_gfun_t first" ,
469 .Fa "history_gfun_t next" ,
470 .Fa "history_gfun_t last" ,
471 .Fa "history_gfun_t prev" ,
472 .Fa "history_gfun_t curr" ,
473 .Fa "history_vfun_t clear" ,
474 .Fa "history_efun_t enter" ,
475 .Fa "history_efun_t add"
477 Define functions to perform various history operations.
479 is the argument given to a function when it's invoked.
481 Return the first element in the history.
483 Return the last element in the history.
485 Return the previous element in the history.
487 Return the next element in the history.
489 Return the current element in the history.
490 .It Dv H_ADD , Fa "const char *str"
493 to the current element of the history, or create an element with
496 .It Dv H_ENTER , Fa "const char *str"
499 as a new element to the history, and, if necessary,
500 removing the oldest entry to keep the list to the created size.
501 .It Dv H_PREV_STR , Fa "const char *str"
502 Return the closest previous event that starts with
504 .It Dv H_NEXT_STR , Fa "const char *str"
505 Return the closest next event that starts with
507 .It Dv H_PREV_EVENT , Fa "int e"
508 Return the previous event numbered
510 .It Dv H_NEXT_EVENT , Fa "int e"
511 Return the next event numbered
513 .It Dv H_LOAD , Fa "const char *file"
514 Load the history list stored in
516 .It Dv H_SAVE , Fa "const char *file"
517 Save the history list to
522 .\"XXX: provide some examples
531 library first appeared in
536 library was written by
537 .An Christos Zoulas ,
538 and this manual was written by
541 This documentation is probably incomplete.
544 should not modify the supplied
547 The tokenization functions are not publicly defined in