Copyright (c) 1997 The NetBSD Foundation, Inc.
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$FreeBSD: head/lib/libedit/editline.3 60772 2000-05-22 05:55:22Z imp $
.Dd January 11, 1997 .Os BSD 4.4 .Dt EDITLINE 3 .Sh NAME .Nm editline , .Nm el_init , .Nm el_end , .Nm el_reset , .Nm el_gets , .Nm el_getc , .Nm el_push , .Nm el_parse , .Nm el_set , .Nm el_source , .Nm el_resize , .Nm el_line , .Nm el_insertstr , .Nm el_deletestr , .Nm el_data_set , .Nm el_data_get , .Nm history_init , .Nm history_end , .Nm history .Nd line editor and history functions .Sh LIBRARY .Lb libedit .Sh SYNOPSIS .Fd #include <histedit.h> .Ft EditLine * .Fn el_init "const char *prog" "FILE *fin" "FILE *fout" .Ft void .Fn el_end "EditLine *e" .Ft void .Fn el_reset "EditLine *e" .Ft const char * .Fn el_gets "EditLine *e" "int *count" .Ft int .Fn el_getc "EditLine *e" "char *ch" .Ft void .Fn el_push "EditLine *e" "const char *str" .Ft int .Fn el_parse "EditLine *e" "int argc" "char *argv[]" .Ft int .Fn el_set "EditLine *e" "int op" "..." .Ft int .Fn el_source "EditLine *e" "const char *file" .Ft void .Fn el_resize "EditLine *e" .Ft const LineInfo * .Fn el_line "EditLine *e" .Ft int .Fn el_insertstr "EditLine *e" "char *str" .Ft void .Fn el_deletestr "EditLine *e" "int count" .Ft void .Fn el_data_set "EditLine *e" "void *data" .Ft void * .Fn el_data_get "EditLine *e" .Ft History * .Fn history_init .Ft void .Fn history_end "History *h" .Ft const HistEvent * .Fn history "History *h" "int op" "..." .Sh DESCRIPTION The .Nm library provides generic line editing and history functions, similar to those found in .Xr sh 1 .
p These functions are available in the .Nm libedit library (which needs the .Nm libtermcap library). Programs should be linked with .Fl ledit ltermcap . .Sh LINE EDITING FUNCTIONS The line editing functions use a common data structure, .Fa EditLine , which is created by .Fn el_init and freed by .Fn el_end .
p The following functions are available: l -tag -width 4n t Fn el_init Initialise the line editor, and return a data structure to be used by all other line editing functions. .Fa prog is the name of the invoking program, used when reading the .Xr editrc 5 file to determine which settings to use. .Fa fin and .Fa fout are the input and output streams (respectively) to use. In this documentation, references to .Dq the tty are actually to this input/output stream combination. t Fn el_end Clean up and finish with .Fa e , assumed to have been created with .Fn el_init . t Fn el_reset Reset the tty and the parser. This should be called after an error which may have upset the tty's state. t Fn el_gets Read a line from the tty. .Fa count is modified to contain the number of characters read. Returns the line read if successful, or .Dv NULL if no characters were read or if an error occurred. t Fn el_getc Read a character from the tty. .Fa ch is modified to contain the character read. Returns the number of characters read if successful, -1 otherwise. t Fn el_push Pushes .Fa str back onto the input stream. This is used by the macro expansion mechanism. Refer to the description of c bind .Fl s in .Xr editrc 5 for more information. t Fn el_parse Parses the .Fa argv array (which is .Fa argc elements in size) to execute builtin .Nm commands. If the command is prefixed with .Dq prog: then .Fn el_parse will only execute the command if .Dq prog matches the .Fa prog argument supplied to .Fn el_init . The return value is -1 if the command is unknown, 0 if there was no error or .Dq prog didn't match, or 1 if the command returned an error. Refer to .Xr editrc 5 for more information.
p .Em NOTE: .Va argv[0] may be modified by .Fn el_parse . The colon between .Dq prog and the command, .Ar command , will be replaced with a NUL
o .Dq \e0
c . t Fn el_set Set .Nm parameters. .Fa op determines which parameter to set, and each operation has its own parameter list.
p The following values for .Fa op are supported, along with the required argument list: l -tag -width 4n t Dv EL_PROMPT , Fa "char *(*f)(EditLine *)" Define prompt printing function as .Fa f , which is to return a string that contains the prompt. t Dv EL_TERMINAL , Fa "const char *type" Define terminal type of the tty to be .Fa type , or to .Ev TERM if .Fa type is .Dv NULL . t Dv EL_EDITOR , Fa "const char *mode" Set editing mode to .Fa mode , which must be one of .Dq emacs or .Dq vi . t Dv EL_SIGNAL , Fa "int flag" If .Fa flag is non-zero, .Nm will install its own signal handler for the following signals when reading command input: .Dv SIGCONT , .Dv SIGHUP , .Dv SIGINT , .Dv SIGQUIT , .Dv SIGSTOP , .Dv SIGTERM , .Dv SIGTSTP , and .Dv SIGWINCH . Otherwise, the current signal handlers will be used. t Dv EL_BIND , Xo .Fa "const char *" , .Fa "..." , .Dv NULL .Xc Perform the c bind builtin command. Refer to .Xr editrc 5 for more information. t Dv EL_ECHOTC , Xo .Fa "const char *" , .Fa "..." , .Dv NULL .Xc Perform the c echotc builtin command. Refer to .Xr editrc 5 for more information. t Dv EL_SETTC , Xo .Fa "const char *" , .Fa "..." , .Dv NULL .Xc Perform the c settc builtin command. Refer to .Xr editrc 5 for more information. t Dv EL_SETTY , Xo .Fa "const char *" , .Fa "..." , .Dv NULL .Xc Perform the c setty builtin command. Refer to .Xr editrc 5 for more information. t Dv EL_TELLTC , Xo .Fa "const char *" , .Fa "..." , .Dv NULL .Xc Perform the c telltc builtin command. Refer to .Xr editrc 5 for more information. t Dv EL_ADDFN , Xo .Fa "const char *name" , .Fa "const char *help" , .Fa "unsigned char (*func)(EditLine *e, int ch) .Xc Add a user defined function, .Fn func , referred to as .Fa name which is invoked when a key which is bound to .Fa name is entered. .Fa help is a description of .Fa name . At invocation time, .Fa ch is the key which caused the invocation. The return value of .Fn func should be one of: l -tag -width "CC_REDISPLAY" t Dv CC_NORM Add a normal character. t Dv CC_NEWLINE End of line was entered. t Dv CC_EOF EOF was entered. t Dv CC_ARGHACK Expecting further command input as arguments, do nothing visually. t Dv CC_REFRESH Refresh display. t Dv CC_CURSOR Cursor moved, so update and perform .Dv CC_REFRESH. t Dv CC_REDISPLAY Redisplay entire input line. This is useful if a key binding outputs extra information. t Dv CC_ERROR An error occurred. Beep, and flush tty. t Dv CC_FATAL Fatal error, reset tty to known state. .El t Dv EL_HIST , Xo .Fa "History *(*func)(History *, int op, ...)" , .Fa "const char *ptr" .Xc Defines which history function to use, which is usually .Fn history . .Fa ptr should be the value returned by .Fn history_init . .El t Fn el_source Initialise .Nm by reading the contents of .Fa file . .Fn el_parse is called for each line in .Fa file . If .Fa file is .Dv NULL , try
a $HOME/.editrc . Refer to .Xr editrc 5 for details on the format of .Fa file . t Fn el_resize Must be called if the terminal size changes. If .Dv EL_SIGNAL has been set with .Fn el_set , then this is done automatically. Otherwise, it's the responsibility of the application to call .Fn el_resize on the appropriate occasions. t Fn el_line Return the editing information for the current line in a .Fa LineInfo structure, which is defined as follows: d -literal typedef struct lineinfo { const char *buffer; /* address of buffer */ const char *cursor; /* address of cursor */ const char *lastchar; /* address of last character */ } LineInfo; .Ed t Fn el_insertstr Insert .Fa str into the line at the cursor. Returns -1 if .Fa str is empty or won't fit, and 0 otherwise. t Fn el_deletestr Delete .Fa num characters before the cursor. t Fn el_data_set Set the user data to .Fa data . t Fn el_data_get Get the user data. .El .Sh HISTORY LIST FUNCTIONS The history functions use a common data structure, .Fa History , which is created by .Fn history_init and freed by .Fn history_end .
p
The following functions are available:
l -tag -width 4n t Fn history_init Initialise the history list, and return a data structure
to be used by all other history list functions.
t Fn history_end Clean up and finish with
.Fa h ,
assumed to have been created with
.Fn history_init .
t Fn history Perform operation
.Fa op
on the history list, with optional arguments as needed by the
operation.
The following values for
.Fa op
are supported, along with the required argument list:
l -tag -width 4n t Dv H_EVENT , Fa "int size" Set size of history to
.Fa size
elements.
t Dv H_END Cleans up and finishes with
.Fa h ,
assumed to be created with
.Fn history_init .
t Dv H_CLEAR Clear the history.
t Dv H_FUNC , Xo .Fa "void *ptr" ,
.Fa "history_gfun_t first" ,
.Fa "history_gfun_t next" ,
.Fa "history_gfun_t last" ,
.Fa "history_gfun_t prev" ,
.Fa "history_gfun_t curr" ,
.Fa "history_vfun_t clear" ,
.Fa "history_efun_t enter" ,
.Fa "history_efun_t add"
.Xc
Define functions to perform various history operations.
.Fa ptr
is the argument given to a function when it's invoked.
t Dv H_FIRST Return the first element in the history.
t Dv H_LAST Return the last element in the history.
t Dv H_PREV Return the previous element in the history.
t Dv H_NEXT Return the next element in the history.
t Dv H_CURR Return the current element in the history.
t Dv H_ADD , Fa "const char *str" Append
.Fa str
to the current element of the history, or create an element with
.Dv H_ENTER
if there isn't one.
t Dv H_ENTER , Fa "const char *str" Add
.Fa str
as a new element to the history, and, if necessary,
removing the oldest entry to keep the list to the created size.
t Dv H_PREV_STR , Fa "const char *str" Return the closest previous event that starts with
.Fa str .
t Dv H_NEXT_STR , Fa "const char *str" Return the closest next event that starts with
.Fa str .
t Dv H_PREV_EVENT , Fa "int e" Return the previous event numbered
.Fa e .
t Dv H_NEXT_EVENT , Fa "int e" Return the next event numbered
.Fa e .
t Dv H_LOAD , Fa "const char *file" Load the history list stored in
.Fa file .
t Dv H_SAVE , Fa "const char *file" Save the history list to
.Fa file .
.El
.El
XXX.Sh EXAMPLES
XXX: provide some examples
.Sh SEE ALSO
.Xr sh 1 ,
.Xr signal 3 ,
.Xr termcap 3 ,
.Xr editrc 5
.Sh HISTORY
The
.Nm
library first appeared in
x 4.4 . .Sh AUTHORS
The
.Nm
library was written by
.An Christos Zoulas ,
and this manual was written by
.An Luke Mewburn .
.Sh BUGS
This documentation is probably incomplete.
p .Fn el_parse should not modify the supplied .Va argv[0] .
p The tokenization functions are not publicly defined in .Li <histedit.h> .