reimplement window resizing

After get_wch() was dropped from the code resizing no longer worked,
so reimplement it. Use a signal handler, and call the proper ncurses
functions so that the internal variables are updated.

ncdc/include/ncdc/mainwindow.h

@@ -27,6 +27,7 @@ struct ncdc_mainwindow_;
 typedef struct ncdc_mainwindow_ *ncdc_mainwindow_t;
 
 ncdc_mainwindow_t ncdc_mainwindow_new(void);
+void ncdc_mainwindow_resize(ncdc_mainwindow_t n);
 
 /* holy shit stains I am lazy
  */

ncdc/src/mainwindow.c

@@ -66,7 +66,6 @@ struct ncdc_mainwindow_
     int focus;
 };
 
-static void ncdc_mainwindow_resize(ncdc_mainwindow_t n);
 static void ncdc_mainwindow_update_focus(ncdc_mainwindow_t n);
 static bool ncdc_mainwindow_callback(ncdc_input_t i, wchar_t const *s,
                                      size_t len, void *arg);
@@ -154,7 +153,7 @@ ncdc_mainwindow_callback(ncdc_input_t i, wchar_t const *s,
     return ret;
 }
 
-static void ncdc_mainwindow_resize(ncdc_mainwindow_t n)
+void ncdc_mainwindow_resize(ncdc_mainwindow_t n)
 {
     n->guilds_h = LINES - 2;
     n->guilds_w = (COLS / 4);

ncdc/src/ncdc.c

@@ -86,6 +86,19 @@ static void cleanup(void)
     dc_unref(mainwin);
 }
 
+static void handle_winch(int sig)
+{
+    /* according to ncurses documentation you should call
+     * endwin(), followed by a refresh() to properly update
+     * curses
+     */
+    endwin();
+    refresh();
+    clear();
+
+    ncdc_mainwindow_resize(mainwin);
+}
+
 static void sighandler(int sig)
 {
     exit_main();
@@ -167,6 +180,7 @@ int main(int ac, char **av)
     int ret = 0;
 
     signal(SIGINT, sighandler);
+    signal(SIGWINCH, handle_winch);
 
     if (getenv("HOME") == NULL) {
         fprintf(stderr, "your environment doesn't contain HOME; pls fix\n");