rl_point is always zero #55
Description
I try to use alternative API
/* For wcwidth() */
#define _XOPEN_SOURCE 700
#include <locale.h>
#include <ncurses.h>
#include <editline/readline.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
int kurzor;
static int readline_proxy;
static bool readline_proxy_is_valid = false;
char *string = NULL;
/*
* Zkopiruje znak z proxy do readline
*/
static int
readline_getc(FILE *dummy)
{
readline_proxy_is_valid = false;
return readline_proxy;
}
/*
* Touto funkci readline predava vysledek editace
*/
static void
readline_callback(char *line)
{
free(string);
string = NULL;
if (line)
string = strdup(line);
}
/*
* Chceme mit zobrazeni ve vlastni rezii
*/
static void
readline_redisplay()
{
/* do nothing here */
}
/*
* Vrati (zobrazovaci) sirku retezce.
*/
static size_t
strnwidth(const char *s, size_t n)
{
mbstate_t shift_state;
wchar_t wc;
size_t wc_len;
size_t width = 0;
size_t ch_width;
memset(&shift_state, '\0', sizeof shift_state);
for (size_t i = 0; i < n; i += wc_len)
{
wc_len = mbrtowc(&wc, s + i, MB_CUR_MAX, &shift_state);
if (!wc_len)
return width;
if ((wc_len == (size_t) -1) || (wc_len == (size_t) -2))
return width + strnlen(s + i, n - i);
if (iswcntrl(wc))
width += 2;
else if ((ch_width = wcwidth(wc)) > 0)
width += ch_width;
}
return width;
}
int
main()
{
int c = 0;
bool alt = false;
char *prompt = ": ";
setlocale(LC_ALL, "");
initscr();
cbreak();
noecho();
/* ENTER neni \n */
nonl();
/*
* readline vyzaduje neprekodovany vstup tj
* vypnuty keypad a cteni vice bajtovych
* znaku po bajtech (emuluje se binarni
* cteni ze souboru v aktualnim kodovani)
*/
keypad(stdscr, FALSE);
/*
* Instalace hooku - pokud se pouzije rl_getc_function,
* tak by se mel VZDY pouzit i rl_input_available_hook.
*/
rl_getc_function = readline_getc;
rl_redisplay_function = readline_redisplay;
/*
* Nechceme obsluhu signalu v readline, a nechceme tab
* complete (neni nakonfigurovano, hrozi pady.
*/
rl_catch_signals = 0;
rl_catch_sigwinch = 0;
rl_inhibit_completion = 0;
/* Zahajeni editace */
rl_callback_handler_install(prompt, readline_callback);
/* Vlozi vychozi (default) text */
rl_insert_text("Editaci ukonci 2x stisk ESCAPE");
while (1)
{
int cursor_pos;
clear();
mvaddstr(10, 10, rl_prompt);
addstr(rl_line_buffer);
if (string)
{
mvaddstr(12, 6, "text: ");
attron(A_REVERSE);
addstr(string);
attroff(A_REVERSE);
}
/* nastav kurzor */
cursor_pos = strnwidth(rl_prompt, SIZE_MAX) +
strnwidth(rl_line_buffer, rl_point);
move(10, 10 + cursor_pos);
refresh();
get_wch(&c);
/* ignoruj tabelatory */
if (c == '\t')
continue;
if (c == 27)
{
if (alt)
break;
else
alt = true;
}
else
alt = false;
readline_proxy = c;
readline_proxy_is_valid = true;
/* posli echo readline, ze jsou nova data k precteni */
rl_callback_read_char();
}
rl_callback_handler_remove();
endwin();
}
I am able to build this example, but the variables rl_point and rl_end are always zero. Unfortunately editline doesn't decode cursor keys or other control keys.
Is this functionality supported? I try to use editline from ncurses application.
tested on FC34
Name : editline
Version : 1.17.1
Release : 3.fc34
Architecture : x86_64
Size : 28 k
Source : editline-1.17.1-3.fc34.src.rpm
Repository : fedora
Summary : A small compatible replacement for readline
URL : https://troglobit.com/projects/editline/
License : HSRL
Description : This is a line editing library for UNIX. It can be linked into almost
: any program to provide command line editing and history. It is call
: compatible with the FSF readline library, but is a fraction of the
: size (and offers fewer features).