EDITLINE

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

These functions are available in the libedit library (which needs the libtermcap library). Programs should be linked with -ledit ltermcap  

LINE EDITING FUNCTIONS

The following functions are available:

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 editrc(5) file to determine which settings to use. Fa fin , Fa fout and Fa 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.

Fn el_end

Clean up and finish with Fa e , assumed to have been created with Fn el_init .

Fn el_reset

Reset the tty and the parser. This should be called after an error which may have upset the tty's state.

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 NULL if no characters were read or if an error occurred.

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.

Fn el_push

Pushes Fa 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.

Fn el_parse

Parses the Fa argv array (which is Fa argc elements in size) to execute builtin commands. If the command is prefixed with ``prog'' then Fn el_parse will only execute the command if ``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 ``prog'' didn't match, or 1 if the command returned an error. Refer to editrc(5) for more information.

Fn el_set

Set parameters. Fa op determines which parameter to set, and each operation has its own parameter list.

The following values for Fa op are supported, along with the required argument list:

EL_PROMPT , Fa char *(*f)(EditLine *)

Define prompt printing function as Fa f , which is to return a string that contains the prompt.

EL_RPROMPT , Fa char *(*f)(EditLine *)

Define right side prompt printing function as Fa f , which is to return a string that contains the prompt.

EL_TERMINAL , Fa const char *type

Define terminal type of the tty to be Fa type , or to TERM if Fa type is NULL

EL_EDITOR , Fa const char *mode

Set editing mode to Fa mode , which must be one of ``emacs'' or ``vi''

EL_SIGNAL , Fa int flag

If Fa flag is non-zero, 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 , Fa const char * , Fa ... , NULL

Perform the bind builtin command. Refer to editrc(5) for more information.

EL_ECHOTC , Fa const char * , Fa ... , NULL

Perform the echotc builtin command. Refer to editrc(5) for more information.

EL_SETTC , Fa const char * , Fa ... , NULL

Perform the settc builtin command. Refer to editrc(5) for more information.

EL_SETTY , Fa const char * , Fa ... , NULL

Perform the setty builtin command. Refer to editrc(5) for more information.

EL_TELLTC , Fa const char * , Fa ... , NULL

Perform the telltc builtin command. Refer to editrc(5) for more information.

EL_ADDFN , Fa const char *name , Fa const char *help , Fa unsigned char (*func)(EditLine *e, int ch)

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:

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

CC_REDISPLAY

Redisplay entire input line. This is useful if a key binding outputs extra information.

CC_ERROR

An error occurred. Beep, and flush tty.

CC_FATAL

Fatal error, reset tty to known state.

EL_HIST , Fa History *(*func)(History *, int op, ...) , Fa const char *ptr

Defines which history function to use, which is usually Fn history . Fa ptr should be the value returned by Fn history_init .

EL_EDITMODE , Fa int flag

If Fa flag is non-zero, editing is enabled (the default). Note that this is only an indication, and does not affect the operation of . At this time, it is the caller's responsibility to check this (using Fn el_get ) to determine if editing should be enabled or not.

EL_GETCFN , Fa int (*f)(EditLine *, char *c)

Define the character reading function as Fa f , which is to return the number of characters read and store them in Fa c . This function is called internally by Fn el_gets and Fn el_getc . The builtin function can be set or restored with the special function name ``EL_BUILTIN_GETCFN''.

EL_CLIENTDATA , Fa void *data

Register Fa data to be associated with this EditLine structure. It can be retrieved with the corresponding Fn el_get call.

Fn el_get

Get parameters. Fa op determines which parameter to retrieve into Fa result . Returns 0 if successful, -1 otherwise.

The following values for Fa op are supported, along with actual type of Fa result :

EL_PROMPT , Fa char *(*f)(EditLine *)

Return a pointer to the function that displays the prompt.

EL_RPROMPT , Fa char *(*f)(EditLine *)

Return a pointer to the function that displays the rightside prompt.

EL_EDITOR , Fa const char *

Return the name of the editor, which will be one of ``emacs'' or ``vi''

EL_SIGNAL , Fa int *

Return non-zero if has installed private signal handlers (see Fn el_get above).

EL_EDITMODE, Fa int *

Return non-zero if editing is enabled.

EL_GETCFN, Fa 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 , Fa void **data

Retrieve Fa data previously registered with the corresponding Fn el_set call.

EL_UNBUFFERED, Fa int

Sets or clears unbuffered mode. In this mode, Fn el_gets will return immediately after processing a single character.

EL_PREP_TERM, Fa int

Sets or clears terminal editing mode.

Fn el_source

Initialise by reading the contents of Fa file . Fn el_parse is called for each line in Fa file . If Fa file is NULL try $PWD/.editrc then $HOME/.editrc Refer to editrc(5) for details on the format of Fa file .

Fn el_resize

Must be called if the terminal size changes. If 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.

Fn el_line

Return the editing information for the current line in a Fa 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;

Fa buffer is not NUL terminated. This function may be called after Fn el_gets to obtain the Fa LineInfo structure pertaining to line returned by that function, and from within user defined functions added with EL_ADDFN

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.

Fn el_deletestr

Delete Fa num characters before the cursor.

HISTORY LIST FUNCTIONS

The following functions are available:

Fn history_init

Initialise the history list, and return a data structure to be used by all other history list functions.

Fn history_end

Clean up and finish with Fa h , assumed to have been created with Fn history_init .

Fn history

Perform operation Fa op on the history list, with optional arguments as needed by the operation. Fa ev is changed accordingly to operation. The following values for Fa op are supported, along with the required argument list:

H_SETSIZE , Fa int size

Set size of history to Fa size elements.

H_GETSIZE

Get number of events currently in history.

H_END

Cleans up and finishes with Fa h , assumed to be created with Fn history_init .

H_CLEAR

Clear the history.

H_FUNC , 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_sfun_t set , Fa history_vfun_t clear , Fa history_efun_t enter , Fa history_efun_t add

Define functions to perform various history operations. Fa ptr is the argument given to a function when it's invoked.

H_FIRST

Return the first element in the history.

H_LAST

Return the last element in the history.

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 , Fa const char *str

Append Fa str to the current element of the history, or perform the H_ENTER operation with argument Fa str if there is no current element.

H_APPEND , Fa const char *str

Append Fa str to the last new element of the history.

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. 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 element. If the element is entered Fn history returns 1, if it is ignored as a duplicate returns 0. Finally Fn history returns -1 if an error occurred.

H_PREV_STR , Fa const char *str

Return the closest previous event that starts with Fa str .

H_NEXT_STR , Fa const char *str

Return the closest next event that starts with Fa str .

H_PREV_EVENT , Fa int e

Return the previous event numbered Fa e .

H_NEXT_EVENT , Fa int e

Return the next event numbered Fa e .

H_LOAD , Fa const char *file

Load the history list stored in Fa file .

H_SAVE , Fa const char *file

Save the history list to Fa file .

H_SETUNIQUE , Fa int unique

Set if the adjacent identical event strings should not be entered into the history.

H_GETUNIQUE

Retrieve the current setting if if adjacent elements should be entered into the history.

Fn history returns >= 0 if the operation Fa op succeeds. Otherwise, -1 is returned and Fa ev is updated to contain more details about the error.

TOKENIZATION FUNCTIONS

The following functions are available:

Fn tok_init

Initialise the tokenizer, and return a data structure to be used by all other tokenizer functions. Fa IFS contains the Input Field Separators, which defaults to Aq space , Aq tab , and Aq newline if NULL

Fn tok_end

Clean up and finish with Fa t , assumed to have been created with Fn tok_init .

Fn tok_reset

Reset the tokenizer state. Use after a line has been successfully tokenized by Fn tok_line or Fn tok_str and before a new line is to be tokenized.

Fn tok_line

Tokenize Fa li , If successful, modify: Fa argv to contain the words, Fa argc to contain the number of words, Fa cursorc (if not NULL to contain the index of the word containing the cursor, and Fa cursoro (if not NULL to contain the offset within Fa argv[cursorc] of the cursor.

Returns 0 if successful, -1 for an internal error, 1 for an unmatched single quote, 2 for an unmatched double quote, and 3 for a backslash quoted Aq newline . A positive exit code indicates that another line should be read and tokenization attempted again.

Fn tok_str

A simpler form of Fn tok_line ; Fa str is a NUL terminated string to tokenize.

SEE ALSO

HISTORY

AUTHORS

BUGS

Index

NAME

LIBRARY

SYNOPSIS

DESCRIPTION

LINE EDITING FUNCTIONS

HISTORY LIST FUNCTIONS

TOKENIZATION FUNCTIONS

SEE ALSO

HISTORY

AUTHORS

BUGS