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+/*
+ * Calcurse - text-based organizer
+ *
+ * Copyright (c) 2004-2011 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"
+
+/* Print the string at the desired position. */
+static void
+showstring (WINDOW *win, int x, int y, char *str, int len, int scroff,
+ int curpos)
+{
+ char c = 0;
+
+ /* print string */
+ mvwaddnstr (win, y, x, &str[scroff], -1);
+ wclrtoeol (win);
+
+ /* print scrolling indicator */
+ if (scroff > 0 && scroff < len - col)
+ c = '*';
+ else if (scroff > 0)
+ c = '<';
+ else if (scroff < len - col)
+ c = '>';
+ mvwprintw (win, y, col - 1, "%c", c);
+
+ /* print cursor */
+ wmove (win, y, curpos - scroff);
+
+ if (curpos >= len)
+ waddch (win, SPACE | A_REVERSE);
+ else
+ waddch (win, str[curpos] | A_REVERSE);
+}
+
+/* Delete a character at the given position in string. */
+static void
+del_char (int pos, char *str)
+{
+ str += pos;
+ memmove (str, str + 1, strlen (str) + 1);
+}
+
+/* Add a character at the given position in string. */
+static void
+ins_char (int pos, int ch, char *str)
+{
+ str += pos;
+ memmove (str + 1, str, strlen (str) + 1);
+ *str = ch;
+}
+
+static void
+bell (void)
+{
+ printf ("\a");
+}
+
+/*
+ * 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)
+{
+ const int pgsize = col / 3;
+
+ int len = strlen (str);
+ int curpos = len;
+ int scroff = 0;
+ int ch;
+
+ custom_apply_attr (win, ATTR_HIGHEST);
+
+ for (;;) {
+ while (curpos < scroff)
+ scroff -= pgsize;
+ while (curpos >= scroff + col - 1)
+ scroff += pgsize;
+
+ showstring (win, x, y, str, len, scroff, curpos);
+ wins_doupdate ();
+
+ if ((ch = wgetch (win)) == '\n') break;
+ switch (ch)
+ {
+ case KEY_BACKSPACE: /* delete one character */
+ case 330:
+ case 127:
+ case CTRL ('H'):
+ if (curpos > 0)
+ {
+ del_char ((--curpos), str);
+ len--;
+ }
+ else
+ bell ();
+ break;
+ case CTRL ('D'): /* delete next character */
+ if (curpos < len)
+ {
+ del_char (curpos, str);
+ len--;
+ }
+ else
+ bell ();
+ break;
+ case CTRL ('W'): /* delete a word */
+ if (curpos > 0) {
+ while (curpos && str[curpos - 1] == ' ')
+ {
+ del_char ((--curpos), str);
+ len--;
+ }
+ while (curpos && str[curpos - 1] != ' ')
+ {
+ del_char ((--curpos), str);
+ len--;
+ }
+ }
+ else
+ bell ();
+ break;
+ case CTRL ('K'): /* delete to end-of-line */
+ str[curpos] = 0;
+ len = curpos;
+ break;
+ case CTRL ('A'): /* go to begginning of string */
+ curpos = 0;
+ break;
+ case CTRL ('E'): /* go to end of string */
+ curpos = len;
+ break;
+ case KEY_LEFT: /* move one char backward */
+ case CTRL ('B'):
+ if (curpos > 0) curpos--;
+ break;
+ case KEY_RIGHT: /* move one char forward */
+ case CTRL ('F'):
+ if (curpos < len) curpos++;
+ break;
+ case ESCAPE: /* cancel editing */
+ return (GETSTRING_ESC);
+ break;
+ default: /* insert one character */
+ if (len < l - 1)
+ {
+ ins_char ((curpos++), ch, str);
+ len++;
+ }
+ }
+ }
+
+ custom_remove_attr (win, ATTR_HIGHEST);
+
+ return (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);
+ (void)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"));
+ (void)memcpy (*str, buf, len + 1);
+ }
+
+ mem_free (buf);
+ return ret;
+}