/****************************************************************************
- * Copyright (c) 1998-2005,2006 Free Software Foundation, Inc. *
+ * Copyright (c) 1998-2014,2016 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
****************************************************************************/
/*
- * Author: Thomas E. Dickey <dickey@clark.net> 1998
+ * Author: Thomas E. Dickey 1998
+ *
+ * $Id: filter.c,v 1.22 2016/03/13 00:41:43 tom Exp $
*
- * $Id: filter.c,v 1.11 2006/12/09 16:53:47 tom Exp $
- */
-#include <test.priv.h>
-
-#if HAVE_FILTER
-
-/*
* An example of the 'filter()' function in ncurses, this program prompts
* for commands and executes them (like a command shell). It illustrates
* how ncurses can be used to implement programs that are not full-screen.
* reset_shell_mode() and reset_prog_mode() functions, we could invoke endwin()
* and refresh(), but that does not work any better.
*/
+#include <test.priv.h>
+
+#if HAVE_FILTER
+
+#include <time.h>
static int
-new_command(char *buffer, int length, attr_t underline)
+show_prompt(int underline, bool clocked)
{
- int code;
+ int limit = COLS;
- attron(A_BOLD);
- printw("Command: ");
+ move(0, 0);
+ attrset(A_NORMAL);
+ clrtoeol();
+ attrset(A_BOLD);
+ addstr("Command: ");
+
+ limit -= getcurx(stdscr);
+
+ if (clocked) {
+ if (limit >= 3) {
+ time_t now = time((time_t *) 0);
+ struct tm *my = localtime(&now);
+ char buffer[80];
+ int skip, y, x;
+ int margin;
+
+ sprintf(buffer, "%02d:%02d:%02d",
+ my->tm_hour,
+ my->tm_min,
+ my->tm_sec);
+
+ if (limit > 9) {
+ skip = 0;
+ } else if (limit > 6) {
+ skip = 3;
+ } else {
+ skip = 6;
+ }
+ /*
+ * Write the clock message on the right-margin so we can show the
+ * results of resizing the screen.
+ */
+ getyx(stdscr, y, x);
+ margin = (int) strlen(buffer) - skip;
+ limit -= margin;
+ move(0, COLS - margin);
+ addstr(buffer);
+ move(y, x);
+ }
+ }
attron(underline);
- code = getnstr(buffer, length);
- /*
- * If this returns anything except ERR/OK, it would be one of ncurses's
- * extensions. Fill the buffer with something harmless that the shell
- * will execute as a comment.
- */
+ return limit;
+}
+
+static int
+new_command(char *buffer, int length, int underline, bool clocked, bool polled)
+{
+ int code = OK;
+ int limit;
+
+ if (polled) {
+ bool done = FALSE;
+ bool first = TRUE;
+ int y, x;
+ int n;
+ int mark = 0;
+ int used = 0;
+ const int gap = 2;
+
+ timeout(20); /* no one types 50CPS... */
+ while (!done) {
+ int ch = getch();
+
+ buffer[used] = '\0';
+
+ limit = show_prompt(underline, clocked);
+ if (first) {
+ getyx(stdscr, y, x);
+ first = FALSE;
+ } else {
+ int left = 0;
+
+ /*
+ * if the screen is too narrow to show the whole buffer,
+ * shift the editing point left/right as needed.
+ */
+ move(y, x);
+ if ((used + gap) > limit) {
+ while ((mark - left + gap) > limit) {
+ left += limit / 2;
+ }
+ }
+ printw("%.*s", limit, buffer + left);
+ move(y, x + mark - left);
+ }
+
+ switch (ch) {
+ case ERR:
+ continue;
+ case '\004':
+ code = ERR;
+ done = TRUE;
+ break;
+ case KEY_ENTER:
+ case '\n':
+ done = TRUE;
+ break;
+ case KEY_BACKSPACE:
+ case '\b':
+ if (used) {
+ if (mark < used) {
+ /* getnstr does not do this */
+ if (mark > 0) {
+ --mark;
+ for (n = mark; n < used; ++n) {
+ buffer[n] = buffer[n + 1];
+ }
+ } else {
+ flash();
+ }
+ } else {
+ /* getnstr does this */
+ mark = --used;
+ buffer[used] = '\0';
+ }
+ } else {
+ flash();
+ }
+ break;
+ /*
+ * Unlike getnstr, this function can move the cursor into the
+ * middle of the buffer and insert/delete at that point.
+ */
+ case KEY_HOME:
+ mark = 0;
+ break;
+ case KEY_END:
+ mark = used;
+ break;
+ case KEY_LEFT:
+ if (mark > 0) {
+ mark--;
+ } else {
+ flash();
+ }
+ break;
+ case KEY_RIGHT:
+ if (mark < used) {
+ mark++;
+ } else {
+ flash();
+ }
+ break;
#ifdef KEY_EVENT
- if (code == KEY_EVENT)
- strcpy(buffer, "# event!");
+ case KEY_EVENT:
+ continue;
#endif
#ifdef KEY_RESIZE
- if (code == KEY_RESIZE) {
- strcpy(buffer, "# resize!");
- getch();
- }
+ case KEY_RESIZE:
+ /*
+ * Unlike getnstr, this function "knows" what the whole screen
+ * is supposed to look like, and can handle resize events.
+ */
+ continue;
#endif
+ case '\t':
+ ch = ' ';
+ /* FALLTHRU */
+ default:
+ if (ch >= KEY_MIN) {
+ flash();
+ continue;
+ }
+ if (mark < used) {
+ /* getnstr does not do this... */
+ for (n = used + 1; n > mark; --n) {
+ buffer[n] = buffer[n - 1];
+ }
+ buffer[mark] = (char) ch;
+ used++;
+ mark++;
+ } else {
+ /* getnstr does this part */
+ buffer[used] = (char) ch;
+ mark = ++used;
+ }
+ break;
+ }
+ }
+ } else {
+ show_prompt(underline, clocked);
+
+ code = getnstr(buffer, length);
+ /*
+ * If this returns anything except ERR/OK, it would be one of ncurses's
+ * extensions. Fill the buffer with something harmless that the shell
+ * will execute as a comment.
+ */
+#ifdef KEY_EVENT
+ if (code == KEY_EVENT)
+ strcpy(buffer, "# event!");
+#endif
+#ifdef KEY_RESIZE
+ if (code == KEY_RESIZE) {
+ strcpy(buffer, "# resize!");
+ getch();
+ }
+#endif
+ }
attroff(underline);
attroff(A_BOLD);
printw("\n");
return code;
}
+static void
+usage(void)
+{
+ static const char *msg[] =
+ {
+ "Usage: filter [options]"
+ ,""
+ ,"Options:"
+ ," -c show current time on prompt line with \"Command\""
+ ," -i use initscr() rather than newterm()"
+ ," -p poll for individual characters rather than using getnstr"
+ };
+ unsigned n;
+ for (n = 0; n < SIZEOF(msg); n++)
+ fprintf(stderr, "%s\n", msg[n]);
+ ExitProgram(EXIT_FAILURE);
+}
+
int
-main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
+main(int argc, char *argv[])
{
+ int ch;
char buffer[80];
- attr_t underline;
+ int underline;
+ bool c_option = FALSE;
+ bool i_option = FALSE;
+ bool p_option = FALSE;
setlocale(LC_ALL, "");
+ while ((ch = getopt(argc, argv, "cip")) != -1) {
+ switch (ch) {
+ case 'c':
+ c_option = TRUE;
+ break;
+ case 'i':
+ i_option = TRUE;
+ break;
+ case 'p':
+ p_option = TRUE;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ printf("starting filter program using %s...\n",
+ i_option ? "initscr" : "newterm");
filter();
- (void) newterm((char *) 0, stdout, stdin);
+ if (i_option) {
+ initscr();
+ } else {
+ (void) newterm((char *) 0, stdout, stdin);
+ }
cbreak();
keypad(stdscr, TRUE);
if (use_default_colors() != ERR)
background = -1;
#endif
- init_pair(1, COLOR_CYAN, background);
+ init_pair(1, COLOR_CYAN, (short) background);
underline = COLOR_PAIR(1);
} else {
underline = A_UNDERLINE;
}
- while (new_command(buffer, sizeof(buffer) - 1, underline) != ERR
- && strlen(buffer) != 0) {
+ for (;;) {
+ int code = new_command(buffer, sizeof(buffer) - 1,
+ underline, c_option, p_option);
+ if (code == ERR || *buffer == '\0')
+ break;
reset_shell_mode();
printf("\n");
fflush(stdout);
- system(buffer);
+ IGNORE_RC(system(buffer));
reset_prog_mode();
touchwin(stdscr);
erase();
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