LIBRARY
Command Line Editor Library (libedit, -ledit)
SYNOPSIS
#include <histedit.h>
EditLine *
el_init(const char *prog, FILE *fin, FILE *fout, FILE *ferr);
void
el_end(EditLine *e);
void
el_reset(EditLine *e);
const char *
el_gets(EditLine *e, int *count);
int
el_getc(EditLine *e, char *ch);
void
el_push(EditLine *e, const char *str);
int
el_parse(EditLine *e, int argc, const char *argv[]);
int
el_set(EditLine *e, int op, ...);
int
el_get(EditLine *e, int op, void *result);
int
el_source(EditLine *e, const char *file);
void
el_resize(EditLine *e);
const LineInfo *
el_line(EditLine *e);
int
el_insertstr(EditLine *e, const char *str);
void
el_deletestr(EditLine *e, int count);
History *
history_init();
void
is created by el_init() and freed by el_end().
The following functions are available:
el_init()
Initialise the line editor, and return a data structure to be used
by all other line editing functions. prog is the name of the
invoking program, used when reading the editrc(5) file to determine
which settings to use. fin, fout and ferr are the input, output,
and error streams (respectively) to use. In this documentation,
references to ``the tty'' are actually to this input/output stream
combination.
el_end()
Clean up and finish with e, assumed to have been created with
el_init().
el_reset()
Reset the tty and the parser. This should be called after an error
which may have upset the tty's state.
el_gets()
Read a line from the tty. count is modified to contain the number
of characters read. Returns the line read if successful, or NULL
if no characters were read or if an error occurred.
el_getc()
Read a character from the tty. ch is modified to contain the char-
acter read. Returns the number of characters read if successful,
-1 otherwise.
el_push()
Pushes str back onto the input stream. This is used by the macro
expansion mechanism. Refer to the description of bind -s in
editrc(5) for more information.
el_parse()
Parses the argv array (which is argc elements in size) to execute
builtin editline commands. If the command is prefixed with
``prog'': then el_parse() will only execute the command if ``prog''
matches the prog argument supplied to el_init(). The return value
is -1 if the command is unknown, 0 if there was no error or
``prog'' didn't match, or 1 if the command returned an error.
Refer to editrc(5) for more information.
el_set()
Set editline parameters. op determines which parameter to set, and
each operation has its own parameter list.
The following values for op are supported, along with the required
argument list:
``vi''.
EL_SIGNAL, int flag
If flag is non-zero, editline will install its own signal
handler for the following signals when reading command input:
SIGCONT, SIGHUP, SIGINT, SIGQUIT, SIGSTOP, SIGTERM, SIGTSTP,
and SIGWINCH. Otherwise, the current signal handlers will be
used.
EL_BIND, const char *, ..., NULL
Perform the bind builtin command. Refer to editrc(5) for
more information.
EL_ECHOTC, const char *, ..., NULL
Perform the echotc builtin command. Refer to editrc(5) for
more information.
EL_SETTC, const char *, ..., NULL
Perform the settc builtin command. Refer to editrc(5) for
more information.
EL_SETTY, const char *, ..., NULL
Perform the setty builtin command. Refer to editrc(5) for
more information.
EL_TELLTC, const char *, ..., NULL
Perform the telltc builtin command. Refer to editrc(5) for
more information.
EL_ADDFN, const char *name, const char *help, unsigned char
(*func)(EditLine *e, int ch)
Add a user defined function, func(), referred to as name
which is invoked when a key which is bound to name is
entered. help is a description of name. At invocation time,
ch is the key which caused the invocation. The return value
of func() should be one of:
CC_NORM Add a normal character.
CC_NEWLINE End of line was entered.
CC_EOF EOF was entered.
CC_ARGHACK Expecting further command input as arguments,
do nothing visually.
CC_REFRESH Refresh display.
CC_REFRESH_BEEP
Refresh display, and beep.
CC_CURSOR Cursor moved, so update and perform CC_REFRESH.
If flag is non-zero, editing is enabled (the default). Note
that this is only an indication, and does not affect the
operation of editline. At this time, it is the caller's
responsibility to check this (using el_get()) to determine if
editing should be enabled or not.
EL_GETCFN, int (*f)(EditLine *, char *c)
Define the character reading function as f, which is to
return the number of characters read and store them in c.
This function is called internally by el_gets() and
el_getc(). The builtin function can be set or restored with
the special function name ``EL_BUILTIN_GETCFN''.
EL_CLIENTDATA, void *data
Register data to be associated with this EditLine structure.
It can be retrieved with the corresponding el_get() call.
el_get()
Get editline parameters. op determines which parameter to retrieve
into result. Returns 0 if successful, -1 otherwise.
The following values for op are supported, along with actual type
of result:
EL_PROMPT, char *(*f)(EditLine *)
Return a pointer to the function that displays the prompt.
EL_RPROMPT, char *(*f)(EditLine *)
Return a pointer to the function that displays the rightside
prompt.
EL_EDITOR, const char *
Return the name of the editor, which will be one of ``emacs''
or ``vi''.
EL_SIGNAL, int *
Return non-zero if editline has installed private signal han-
dlers (see el_get() above).
EL_EDITMODE, int *
Return non-zero if editing is enabled.
EL_GETCFN, int (**f)(EditLine *, char *)
Return a pointer to the function that read characters, which
is equal to ``EL_BUILTIN_GETCFN'' in the case of the default
builtin function.
EL_CLIENTDATA, void **data
Retrieve data previously registered with the corresponding
el_set() call.
EL_UNBUFFERED, int
set with el_set(), then this is done automatically. Otherwise,
it's the responsibility of the application to call el_resize() on
the appropriate occasions.
el_line()
Return the editing information for the current line in a LineInfo
structure, which is defined as follows:
typedef struct lineinfo {
const char *buffer; /* address of buffer */
const char *cursor; /* address of cursor */
const char *lastchar; /* address of last character */
} LineInfo;
el_insertstr()
Insert str into the line at the cursor. Returns -1 if str is empty
or won't fit, and 0 otherwise.
el_deletestr()
Delete num characters before the cursor.
HISTORY LIST FUNCTIONS
The history functions use a common data structure, History, which is cre-
ated by history_init() and freed by history_end().
The following functions are available:
history_init()
Initialise the history list, and return a data structure to be used
by all other history list functions.
history_end()
Clean up and finish with h, assumed to have been created with
history_init().
history()
Perform operation op on the history list, with optional arguments
as needed by the operation. ev is changed accordingly to opera-
tion. The following values for op are supported, along with the
required argument list:
H_SETSIZE, int size
Set size of history to size elements.
H_GETSIZE
Get number of events currently in history.
H_END
Cleans up and finishes with h, assumed to be created with
history_init().
H_CLEAR
H_PREV
Return the previous element in the history.
H_NEXT
Return the next element in the history.
H_CURR
Return the current element in the history.
H_SET
Set the cursor to point to the requested element.
H_ADD, const char *str
Append str to the current element of the history, or perform
the H_ENTER operation wth argument str if there is no current
element.
H_APPEND, const char *str
Append str to the last new element of the history.
H_ENTER, const char *str
Add str as a new element to the history, and, if necessary,
removing the oldest entry to keep the list to the created
size. If H_SETUNIQUE was has been called with a non-zero
arguments, the element will not be entered into the history
if its contents match the ones of the current history ele-
ment. If the element is entered history() returns 1, if it
is ignored as a duplicate returns 0. Finally history()
returns -1 if an error occurred.
H_PREV_STR, const char *str
Return the closest previous event that starts with str.
H_NEXT_STR, const char *str
Return the closest next event that starts with str.
H_PREV_EVENT, int e
Return the previous event numbered e.
H_NEXT_EVENT, int e
Return the next event numbered e.
H_LOAD, const char *file
Load the history list stored in file.
H_SAVE, const char *file
Save the history list to file.
H_SETUNIQUE, int unique
Set if the adjacent identical event strings should not be
entered into the history.
NetBSD 1.3. CC_REFRESH_BEEP, EL_EDITMODE and the readline emulation
appeared in NetBSD 1.4. EL_RPROMPT appeared in NetBSD 1.5.
AUTHORS
The editline library was written by Christos Zoulas. Luke Mewburn wrote
this manual and implemented CC_REDISPLAY, CC_REFRESH_BEEP, EL_EDITMODE,
and EL_RPROMPT. Jaromir Dolecek implemented the readline emulation.
BUGS
The tokenization functions are not publicly defined in <histedit.h>.
At this time, it is the responsibility of the caller to check the result
of the EL_EDITMODE operation of el_get() (after an el_source() or
el_parse()) to determine if editline should be used for further input.
I.e., EL_EDITMODE is purely an indication of the result of the most
recent editrc(5) edit command.
BSD October 17, 2003 BSD
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