/*
* Calcurse - text-based organizer
*
* Copyright (c) 2004-2012 calcurse Development Team <misc@calcurse.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Send your feedback or comments to : misc@calcurse.org
* Calcurse home page : http://calcurse.org
*
*/
#include "calcurse.h"
struct getstr_charinfo {
unsigned int offset, dpyoff;
};
struct getstr_status {
char *s;
struct getstr_charinfo *ci;
int pos, len;
int scrpos;
};
/* Print the string at the desired position. */
static void
getstr_print (WINDOW *win, int x, int y, struct getstr_status *st)
{
char c = 0;
/* print string */
mvwaddnstr (win, y, x, &st->s[st->ci[st->scrpos].offset], -1);
wclrtoeol (win);
/* print scrolling indicator */
if (st->scrpos > 0 && st->ci[st->len].dpyoff -
st->ci[st->scrpos].dpyoff > col - 2)
c = '*';
else if (st->scrpos > 0)
c = '<';
else if (st->ci[st->len].dpyoff - st->ci[st->scrpos].dpyoff > col - 2)
c = '>';
mvwprintw (win, y, col - 2, " %c", c);
/* print cursor */
wmove (win, y, st->ci[st->pos].dpyoff - st->ci[st->scrpos].dpyoff);
wchgat (win, 1, A_REVERSE, COLR_CUSTOM, NULL);
}
/* Delete a character at the given position in string. */
static void
getstr_del_char (struct getstr_status *st)
{
char *str = st->s + st->ci[st->pos].offset;
int cl = st->ci[st->pos + 1].offset - st->ci[st->pos].offset;
int cw = st->ci[st->pos + 1].dpyoff - st->ci[st->pos].dpyoff;
int i;
memmove (str, str + cl, strlen (str) + 1);
st->len--;
for (i = st->pos; i <= st->len; i++)
{
st->ci[i].offset = st->ci[i + 1].offset - cl;
st->ci[i].dpyoff = st->ci[i + 1].dpyoff - cw;
}
}
/* Add a character at the given position in string. */
static void
getstr_ins_char (struct getstr_status *st, char *c)
{
char *str = st->s + st->ci[st->pos].offset;
int cl = UTF8_LENGTH (c[0]);
int cw = utf8_width (c);
int i;
memmove (str + cl, str, strlen (str) + 1);
for (i = 0; i < cl; i++, str++)
*str = c[i];
for (i = st->len; i >= st->pos; i--)
{
st->ci[i + 1].offset = st->ci[i].offset + cl;
st->ci[i + 1].dpyoff = st->ci[i].dpyoff + cw;
}
st->len++;
}
static void
bell (void)
{
putchar ('\a');
}
/* Initialize getstring data structure. */
static void
getstr_init (struct getstr_status *st, char *str, struct getstr_charinfo *ci)
{
int width;
st->s = str;
st->ci = ci;
st->len = width = 0;
while (*str)
{
st->ci[st->len].offset = str - st->s;
st->ci[st->len].dpyoff = width;
st->len++;
width += utf8_width (str);
str += UTF8_LENGTH (*str);
}
st->ci[st->len].offset = str - st->s;
st->ci[st->len].dpyoff = width;
st->pos = st->len;
st->scrpos = 0;
}
/* Scroll left/right if the cursor moves outside the window range. */
static void
getstr_fixscr (struct getstr_status *st)
{
const int pgsize = col / 3;
int pgskip;
while (st->pos < st->scrpos)
{
pgskip = 0;
while (pgskip < pgsize && st->scrpos > 0)
{
st->scrpos--;
pgskip += st->ci[st->scrpos + 1].dpyoff - st->ci[st->scrpos].dpyoff;
}
}
while (st->ci[st->pos].dpyoff - st->ci[st->scrpos].dpyoff > col - 2)
{
pgskip = 0;
while (pgskip < pgsize && st->scrpos < st->len)
{
pgskip += st->ci[st->scrpos + 1].dpyoff - st->ci[st->scrpos].dpyoff;
st->scrpos++;
}
}
}
/*
* Getstring allows to get user input and to print it on a window,
* even if noecho() is on. This function is also used to modify an existing
* text (the variable string can be non-NULL).
* We need to do the echoing manually because of the multi-threading
* environment, otherwise the cursor would move from place to place without
* control.
*/
enum getstr
getstring (WINDOW *win, char *str, int l, int x, int y)
{
struct getstr_status st;
struct getstr_charinfo ci[l + 1];
int ch, k;
char c[UTF8_MAXLEN];
getstr_init (&st, str, ci);
custom_apply_attr (win, ATTR_HIGHEST);
for (;;) {
getstr_fixscr (&st);
getstr_print (win, x, y, &st);
wins_doupdate ();
if ((ch = wgetch (win)) == '\n') break;
switch (ch)
{
case KEY_BACKSPACE: /* delete one character */
case 330:
case 127:
case CTRL ('H'):
if (st.pos > 0)
{
st.pos--;
getstr_del_char (&st);
}
else
bell ();
break;
case CTRL ('D'): /* delete next character */
if (st.pos < st.len)
getstr_del_char (&st);
else
bell ();
break;
case CTRL ('W'): /* delete a word */
if (st.pos > 0) {
while (st.pos && st.s[st.ci[st.pos - 1].offset] == ' ')
{
st.pos--;
getstr_del_char (&st);
}
while (st.pos && st.s[st.ci[st.pos - 1].offset] != ' ')
{
st.pos--;
getstr_del_char (&st);
}
}
else
bell ();
break;
case CTRL ('K'): /* delete to end-of-line */
st.s[st.ci[st.pos].offset] = 0;
st.len = st.pos;
break;
case CTRL ('A'): /* go to begginning of string */
st.pos = 0;
break;
case CTRL ('E'): /* go to end of string */
st.pos = st.len;
break;
case KEY_LEFT: /* move one char backward */
case CTRL ('B'):
if (st.pos > 0) st.pos--;
break;
case KEY_RIGHT: /* move one char forward */
case CTRL ('F'):
if (st.pos < st.len) st.pos++;
break;
case ESCAPE: /* cancel editing */
return GETSTRING_ESC;
break;
default: /* insert one character */
c[0] = ch;
for (k = 1; k < MIN (UTF8_LENGTH (c[0]), UTF8_MAXLEN); k++)
c[k] = (unsigned char)wgetch (win);
if (st.ci[st.len].offset + k < l)
{
getstr_ins_char (&st, c);
st.pos++;
}
}
}
custom_remove_attr (win, ATTR_HIGHEST);
return st.len == 0 ? GETSTRING_RET : GETSTRING_VALID;
}
/* Update an already existing string. */
int
updatestring (WINDOW *win, char **str, int x, int y)
{
int len = strlen (*str);
char *buf;
enum getstr ret;
EXIT_IF (len + 1 > BUFSIZ, _("Internal error: line too long"));
buf = mem_malloc (BUFSIZ);
memcpy (buf, *str, len + 1);
ret = getstring (win, buf, BUFSIZ, x, y);
if (ret == GETSTRING_VALID)
{
len = strlen (buf);
*str = mem_realloc (*str, len + 1, 1);
EXIT_IF (*str == NULL, _("out of memory"));
memcpy (*str, buf, len + 1);
}
mem_free (buf);
return ret;
}
