Function refreshMultiLine

linenoise.c:1426–1587

Multi line low level line refresh. * * Rewrite the currently edited line accordingly to the buffer content, * cursor position, and number of columns of the terminal. * * Flags is REFRESH_* macros. The function can just remove the old * prompt, just write it, or both. * * This function is UTF-8 aware and uses display widths for positioning. */

     * We need to trim full UTF-8 characters from the left until the
     * cursor position fits within the terminal width. */
    while (pwidth + poscol >= l->cols) {
        size_t clen = utf8NextCharLen(buf, 0, len);
        int cwidth = utf8SingleCharWidth(buf, clen);
        buf += clen;
        len -= clen;
        pos -= clen;
        poscol -= cwidth;
        lencol -= cwidth;
    }

    /* Trim from the right if the line still doesn't fit. */
    while (pwidth + lencol > l->cols) {
        size_t clen = utf8PrevCharLen(buf, len);
        int cwidth = utf8SingleCharWidth(buf + len - clen, clen);
        len -= clen;
        lencol -= cwidth;
    }

    abInit(&ab);
    /* Cursor to left edge */
    snprintf(seq,sizeof(seq),"\r");
    abAppend(&ab,seq,strlen(seq));

    if (flags & REFRESH_WRITE) {
        /* Write the prompt and the current buffer content */
        abAppend(&ab,l->prompt,l->plen);
        if (maskmode == 1) {
            /* In mask mode, we output one '*' per UTF-8 character, not byte */
            size_t i = 0;
            while (i < len) {
                abAppend(&ab,"*",1);
                i += utf8NextCharLen(buf, i, len);
            }
        } else {
            abAppend(&ab,buf,len);
        }
        /* Show hints if any. */
        refreshShowHints(&ab,l,pwidth,fullwidth);
    }

    /* Erase to right */
    snprintf(seq,sizeof(seq),"\x1b[0K");
    abAppend(&ab,seq,strlen(seq));

    if (flags & REFRESH_WRITE) {
        /* Move cursor to original position (using display column, not byte). */
        snprintf(seq,sizeof(seq),"\r\x1b[%dC", (int)(poscol+pwidth));
        abAppend(&ab,seq,strlen(seq));
    }

    if (linenoiseWrite(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
    abFree(&ab);
    free(render);
}

/* Multi line low level line refresh.
 *
 * Rewrite the currently edited line accordingly to the buffer content,