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-rw-r--r--src/getstring.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/src/getstring.c b/src/getstring.c
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+++ b/src/getstring.c
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+/*
+ * 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;
+}
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