X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Fclient%2Fwindows.c;h=e84d652554c74ba12face4114501818193f500ad;hb=169b8dda5f4c4373300b5be5edc113a376799737;hp=1459ec2303c6c3b83946dbc4f94a8bd5252c16a5;hpb=0b7798939c0193fd794985b503737e40d8602313;p=plomrogue

diff --git a/src/client/windows.c b/src/client/windows.c
index 1459ec2..e84d652 100644
--- a/src/client/windows.c
+++ b/src/client/windows.c
@@ -1,53 +1,70 @@
 /* src/client/windows.c */
 
+#define _POSIX_C_SOURCE 200809L /* strnlen() */
 #include "windows.h"
+#include <ncurses.h> /* chtype, getmaxx(), getmaxy(), erase(), werase(),
+                      * endwin(), delwin(), wnoutrefresh(), pnoutrefresh(),
+                      * doupdate(), refresh(), delwin(), newpad(), mvwaddch(),
+                      * mvwaddstr()
+                      */
 #include <stddef.h> /* NULL */
 #include <stdint.h> /* uint8_t, uint16_t, uint32_t, UINT16_MAX */
 #include <stdio.h> /* sprintf() */
-#include <stdlib.h> /* free() */
-#include <string.h> /* strlen(), memcpy(), strnlen() */
-#include <ncurses.h> /* chtype, pnoutrefresh(), doupdate(), werase(), erase(),
-                      * wnoutrefresh(), getmaxx(), getmaxy(), initscr(),
-                      * noecho(), curs_set(), newpad(), mvwaddch(), mvwaddstr(),
-                      * wresize()
-                      */
-#include "../common/rexit.h" /* for exit_err() */
-#include "../common/try_malloc.h" /* for try_malloc() */
-#include "../common/yx_uint16.h" /* for struct yx_uint16 */
-#include "cleanup.h" /* for set_cleanup_flag() */
-#include "misc.h" /* for center_offset() */
-#include "world.h" /* for world global */
-
-
-
-
-/* Make virtual screen just wide enough to contain all visible windows. */
-static void refit_pad();
+#include <stdlib.h> /* free(), atoi() */
+#include <string.h> /* memcpy(), strlen(), strnlen(), strchr(), memset() */
+#include "../common/err_try_fgets.h" /* err_try_fgets(), err_line() */
+#include "../common/readwrite.h" /* try_fputc(), try_write(), try_fgetc() */
+#include "../common/rexit.h" /* exit_trouble(), exit_err() */
+#include "../common/try_malloc.h" /* try_malloc() */
+#include "../common/yx_uint16.h" /* struct yx_uint16 */
+#include "array_append.h" /* array_append() */
+#include "draw_wins.h" /* draw_winconf_geometry(), draw_winconf_keybindings(),
+                        * draw_win_inventory(), draw_win_info(), draw_win_log(),
+                        * draw_win_available_keybindings(), draw_win_map(),
+                        * draw_win_keybindings_winconf_keybindings(),
+                        * draw_win_keybindings_winconf_geometry(),
+                        * draw_win_keybindings_global()
+                        */
+#include "keybindings.h" /* write_keybidings_to_file(),
+                          * read_keybindings_from_file()
+                          */
+#include "wincontrol.h" /* toggle_window() */
+#include "world.h" /* global world */
+
+
+
+/* Calculate "id"'s window's size from v_screen size and .target_(height/width).
+ * A .target_width == 0 makes the window as wide as .t_screen. .target_height ==
+ * 0 sets the maximum allowed height: one cell smaller than that of .v_screen.
+ * Negative values make width/height so many cells smaller than what 0 would
+ * set. Values that would reduce the window height or width to less than 1 cell
+ * according to the aforementioned rules set the height/width as if they were 0.
+ */
+static void init_win_size_from_winconf_and_v_screen_size(char id);
 
-/* Update geometry (sizes, positions) of window "w" and its successors in the
- * window chain. Use place_win() for the positioning algorithm.
+/* Get (Win->draw) function identified by "c"; NULL if c not mapped to one.
+ * match_func() is just a little helper to it.
  */
-static void update_wins(struct Win * w);
-static void place_win(struct Win * w);
+static uint8_t match_func(char c, void (** f) (), char c_m, void (* f_m) ());
+static void (* get_drawfunc_by_char(char c)) ();
+
+/* Iterate over chars of world.winDB.ids array / string. Restart after \0.*/
+static char get_next_win_id();
 
 /* Draw scroll hint (a line saying that there are "dist" more elements of "unit"
- * further into the direction symbolized by "dir") into virtual screen, onto an
- * appropriate edge of a window or the screen; the left/right edge if "dir" is
- * "<"/">", or the top/bottom edge if it is "^"/"v". "start" be either the start
- * coordinate of a window's frame, or .y=0, .x=wm->pad_offset for the virtual
- * screen. winscroll_hint() and padscroll_hint() are wrappers to both cases.
+ * further into the direction symbolized by "dir") into .v_screen, onto an
+ * appropriate edge of a window or .v_screen; the left/right edge if "dir" is
+ * "<"/">", or the top/bottom edge if it is "^"/"v". Use "start" as the start
+ * coordinate of the frame that is to contain the scroll hints. winscroll_hint()
+ * is a wrapper that uses the border of window "w" as this frame.
  */
 static void scroll_hint(struct yx_uint16 fsize, char dir, uint16_t dist,
                         char * unit, struct yx_uint16 start);
 static void winscroll_hint(struct Win * w, char dir, uint16_t dist);
-static void padscroll_hint(char dir, uint16_t dist);
-
-/* Draw contents of all windows in window chain from window "w" onwards. */
-static void draw_wins(struct Win * w);
 
 /* draw_win_borderlines() draws vertical/horizontal borders of window "w" sans
- * corners into the virtual screen. It draws the top border line as the windows'
- * title bar (highlighted if the window is selected as active). It is called
+ * corners into .v_screen. It draws the top border line as the windows' title
+ * bar (highlighted if the window is selected as active). It is called
  * recursively by draw_wins_borderlines() on all windows from "w" on.
  * draw_wins_bordercorners() draws the border corners of "w" and its successors.
  */
@@ -55,105 +72,81 @@ static void draw_win_borderlines(struct Win * w);
 static void draw_wins_borderlines(struct Win * w);
 static void draw_wins_bordercorners(struct Win * w);
 
-/* Shift active window forwards / backwards in window chain. */
-static void shift_win_forward();
-static void shift_win_backward();
+/* Draw contents of all windows in window chain from window "w" onwards. */
+static void draw_wins(struct Win * w);
 
 
 
-static void refit_pad()
+static void init_win_size_from_winconf_and_v_screen_size(char id)
 {
-    /* Determine rightmost window column. */
-    uint32_t lastwcol = 0;
-    struct Win * wp = world.wmeta.chain_start;
-    while (wp != 0)
+    struct Win * w = get_win_by_id(id);
+    w->frame_size.y  = world.winDB.v_screen_size.y - 1;
+    if      (   0 < w->target_height
+             && w->target_height <= world.winDB.v_screen_size.y - 1)
     {
-        if ((uint32_t) wp->start.x + (uint32_t) wp->framesize.x > lastwcol + 1)
-        {
-            lastwcol = (uint32_t) wp->start.x + (uint32_t) wp->framesize.x - 1;
-        }
-        wp = wp->next;
+        w->frame_size.y = w->target_height;
     }
-
-    /* Only resize the pad if the rightmost window column has changed. */
-    char * err_s = "refit_pad() extends virtual screen beyond legal sizes.";
-    char * err_m = "refit_pad() triggers memory alloc error via wresize().";
-    if (getmaxx(world.wmeta.pad) + 1 != lastwcol)
+    else if (   0 > w->target_height
+             && world.winDB.v_screen_size.y + (w->target_height - 1) > 0)
+    {
+        w->frame_size.y = world.winDB.v_screen_size.y + (w->target_height - 1);
+    }
+    w->frame_size.x  = world.winDB.v_screen_size.x;
+    if      (0 < w->target_width)
+    {
+        w->frame_size.x = w->target_width;
+    }
+    else if (   0 > w->target_width
+             && world.winDB.v_screen_size.x + w->target_width > 0)
     {
-        uint8_t t = (lastwcol + 2 > UINT16_MAX);
-        exit_err(t, err_s);
-        t = wresize(world.wmeta.pad, getmaxy(world.wmeta.pad), lastwcol + 2);
-        exit_err(t, err_m);
+        w->frame_size.x = world.winDB.v_screen_size.x + w->target_width;
     }
 }
 
 
 
-static void update_wins(struct Win * w)
+static uint8_t match_func(char c, void (** f) (), char c_m, void (* f_m) ())
 {
-    place_win(w);
-    refit_pad();
-    if (0 != w->next)
+    if (c == c_m)
     {
-        update_wins(w->next);
+        * f = f_m;
+        return 1;
     }
+    return 0;
 }
 
 
 
-static void place_win(struct Win * w)
+static void (* get_drawfunc_by_char(char c)) ()
 {
-    /* If w is first window, it goes into the top left corner. */
-    w->start.x = 0;
-    w->start.y = 1;                             /* Leave space for title bar. */
-    if (0 != w->prev)
-    {
+    void (* f) (struct Win *) = NULL;
+    if (   match_func(c, &f, 'c', draw_win_inventory)
+        || match_func(c, &f, 'i', draw_win_info)
+        || match_func(c, &f, 'l', draw_win_log)
+        || match_func(c, &f, 'k', draw_win_available_keybindings)
+        || match_func(c, &f, 'm', draw_win_map)
+        || match_func(c, &f, '0', draw_win_keybindings_global)
+        || match_func(c, &f, '1', draw_win_keybindings_winconf_geometry)
+        || match_func(c, &f, '2', draw_win_keybindings_winconf_keybindings))
+    {
+        ;
+    }
+    return f;
+}
 
-        /* If not, fit w's top left to top right of last top predecessor. */
-        struct Win * w_top = w->prev;
-        while (w_top->start.y != 1)
-        {
-            w_top = w_top->prev;
-        }
-        w->start.x = w_top->start.x + w_top->framesize.x + 1;
 
-        /* Fit w's top left to bottom left of its ->prev if enough space. */
-        uint16_t w_prev_maxy = w->prev->start.y + w->prev->framesize.y;
-        if (   w->framesize.x <= w->prev->framesize.x
-            && w->framesize.y <  world.wmeta.padsize.y - w_prev_maxy)
-        {
-            w->start.x = w->prev->start.x;
-            w->start.y = w_prev_maxy + 1;
-        }
 
-        /* Failing that, try to fit w' top left to the top right of the last
-         * predecessor w_test 1) not followed by windows with a left corner
-         * further rightwards than its own 2) with enough space rightwards for w
-         * until the bottom right of w_thr directly throning over it 3) and with
-         * this same space extending far enough to the bottom for fitting in w.
-         */
-        else
-        {
-            struct Win * w_test = w->prev;
-            struct Win * w_thr;
-            while (w_test != w_top)
-            {
-                w_thr = w_test->prev;
-                for (; w_test->start.y <= w_thr->start.y; w_thr = w_thr->prev);
-                uint16_t w_thr_bottom = w_thr->start.y + w_thr->framesize.y;
-                uint16_t free_width = (w_thr->start.x + w_thr->framesize.x)
-                                      - (w_test->start.x + w_test->framesize.x);
-                if (   w->framesize.y < world.wmeta.padsize.y - w_thr_bottom
-                    && w->framesize.x < free_width)
-                {
-                    w->start.x = w_test->start.x + w_test->framesize.x + 1;
-                    w->start.y = w_thr_bottom + 1;
-                    break;
-                }
-                w_test = w_thr;
-            }
-        }
+static char get_next_win_id()
+{
+    static uint8_t i = 0;
+    char c = world.winDB.ids[i];
+    if (0 == c)
+    {
+        i = 0;
+        return c;
     }
+    i++;
+    return c;
 }
 
 
@@ -198,23 +191,14 @@ static void scroll_hint(struct yx_uint16 fsize, char dir, uint16_t dist,
         }
         if ('<' == dir || '>' == dir)
         {
-            mvwaddch(world.wmeta.pad, start.y + q, start.x + draw_offset, c);
+            mvwaddch(world.winDB.v_screen, start.y+q, start.x+draw_offset, c);
             continue;
         }
-        mvwaddch(world.wmeta.pad, start.y + draw_offset, start.x + q, c);
+        mvwaddch(world.winDB.v_screen, start.y + draw_offset, start.x + q, c);
     }
 }
 
 
-static void padscroll_hint(char dir, uint16_t dist)
-{
-    struct yx_uint16 start;
-    start.y = 0;
-    start.x = world.wmeta.pad_offset;
-    scroll_hint(world.wmeta.padsize, dir, dist, "columns", start);
-}
-
-
 
 static void winscroll_hint(struct Win * w, char dir, uint16_t dist)
 {
@@ -224,52 +208,7 @@ static void winscroll_hint(struct Win * w, char dir, uint16_t dist)
         unit = "columns";
     }
     struct yx_uint16 start = w->start;
-    scroll_hint(w->framesize, dir, dist, unit, start);
-}
-
-
-
-static void draw_wins(struct Win * w)
-{
-    w->draw(w);
-    uint16_t size_y = w->winmapsize.y;
-    uint16_t size_x = w->winmapsize.x;
-    uint16_t offset_y = center_offset(w->center.y, size_y, w->framesize.y);
-    uint16_t offset_x = center_offset(w->center.x, size_x, w->framesize.x);
-    uint16_t y, x;
-    for (y = offset_y; y < w->framesize.y + offset_y && y < size_y; y++)
-    {
-        for (x = offset_x; x < w->framesize.x + offset_x && x < size_x; x++)
-        {
-            chtype ch = w->winmap[(y * w->winmapsize.x) + x];
-            mvwaddch(world.wmeta.pad, w->start.y + (y - offset_y),
-                                       w->start.x + (x - offset_x), ch);
-        }
-    }
-    free(w->winmap);
-    w->winmap = NULL;
-    w->winmapsize.y = 0;
-    w->winmapsize.x = 0;
-    if (offset_y > 0)
-    {
-        winscroll_hint(w, '^', offset_y + 1);
-    }
-    if (size_y > offset_y + w->framesize.y)
-    {
-        winscroll_hint(w, 'v', size_y - ((offset_y + w->framesize.y) - 1));
-    }
-    if (offset_x > 0)
-    {
-        winscroll_hint(w, '<', offset_x + 1);
-    }
-    if (size_x > offset_x + w->framesize.x)
-    {
-        winscroll_hint(w, '>', size_x - ((offset_x + w->framesize.x) - 1));
-    }
-    if (0 != w->next)
-    {
-        return draw_wins(w->next);
-    }
+    scroll_hint(w->frame_size, dir, dist, unit, start);
 }
 
 
@@ -278,38 +217,37 @@ static void draw_win_borderlines(struct Win * w)
 {
     /* Draw vertical and horizontal border lines. */
     uint16_t y, x;
-    for (y = w->start.y; y <= w->start.y + w->framesize.y; y++)
+    for (y = w->start.y; y <= w->start.y + w->frame_size.y; y++)
     {
-        mvwaddch(world.wmeta.pad, y, w->start.x - 1,              '|');
-        mvwaddch(world.wmeta.pad, y, w->start.x + w->framesize.x, '|');
+        mvwaddch(world.winDB.v_screen, y, w->start.x - 1,              '|');
+        mvwaddch(world.winDB.v_screen, y, w->start.x + w->frame_size.x, '|');
     }
-    for (x = w->start.x; x <= w->start.x + w->framesize.x; x++)
+    for (x = w->start.x; x <= w->start.x + w->frame_size.x; x++)
     {
-        mvwaddch(world.wmeta.pad, w->start.y - 1,              x, '-');
-        mvwaddch(world.wmeta.pad, w->start.y + w->framesize.y, x, '-');
+        mvwaddch(world.winDB.v_screen, w->start.y - 1,              x, '-');
+        mvwaddch(world.winDB.v_screen, w->start.y + w->frame_size.y, x, '-');
     }
 
     /* Draw as much as possible of the title into center of top border line. */
-    char min_title_length_visible = 3;  /* min. 1 char + 2 padding/decoration */
-    if (w->framesize.x >= min_title_length_visible)
+    uint8_t min_title_length_visible = 3;/* min. 1 char +2 padding/decoration*/
+    if (w->frame_size.x >= min_title_length_visible)
     {
-        uint16_t title_offset = 0;
-        if (w->framesize.x > strlen(w->title) + 2)
+        uint16_t offset = 0;
+        if (w->frame_size.x > strlen(w->title) + 2)
         {
-            title_offset = (w->framesize.x - (strlen(w->title) + 2)) / 2;
+            offset = (w->frame_size.x - (strlen(w->title) + 2)) / 2;
         }                                    /* +2 is for padding/decoration */
-        uint16_t length_visible = strnlen(w->title, w->framesize.x - 2);
+        uint16_t length_visible = strnlen(w->title, w->frame_size.x - 2);
         char title[length_visible + 3];
         char decoration = ' ';
-        if (w == world.wmeta.active)
+        if (w->id == world.winDB.active)
         {
             decoration = '$';
         }
         memcpy(title + 1, w->title, length_visible);
         title[0] = title[length_visible + 1] = decoration;
         title[length_visible + 2] = '\0';
-        mvwaddstr(world.wmeta.pad,
-                  w->start.y - 1, w->start.x + title_offset, title);
+        mvwaddstr(world.winDB.v_screen, w->start.y-1, w->start.x+offset, title);
     }
 }
 
@@ -318,9 +256,10 @@ static void draw_win_borderlines(struct Win * w)
 static void draw_wins_borderlines(struct Win * w)
 {
     draw_win_borderlines(w);
-    if (0 != w->next)
+    struct Win * next = get_win_after(w->id);
+    if (next)
     {
-        draw_wins_borderlines(w->next);
+        draw_wins_borderlines(next);
     }
 }
 
@@ -328,306 +267,318 @@ static void draw_wins_borderlines(struct Win * w)
 
 static void draw_wins_bordercorners(struct Win * w)
 {
-    mvwaddch(world.wmeta.pad, w->start.y - 1, w->start.x - 1, '+');
-    mvwaddch(world.wmeta.pad, w->start.y - 1, w->start.x + w->framesize.x,'+');
-    mvwaddch(world.wmeta.pad, w->start.y + w->framesize.y, w->start.x - 1,'+');
-    mvwaddch(world.wmeta.pad, w->start.y + w->framesize.y,
-             w->start.x + w->framesize.x, '+');
-    if (0 != w->next)
-    {
-        draw_wins_bordercorners(w->next);
+    mvwaddch(world.winDB.v_screen,
+             w->start.y - 1, w->start.x - 1,              '+');
+    mvwaddch(world.winDB.v_screen,
+             w->start.y - 1, w->start.x + w->frame_size.x, '+');
+    mvwaddch(world.winDB.v_screen,
+             w->start.y + w->frame_size.y, w->start.x - 1, '+');
+    mvwaddch(world.winDB.v_screen, w->start.y + w->frame_size.y,
+             w->start.x + w->frame_size.x,                 '+');
+    struct Win * next = get_win_after(w->id);
+    if (next)
+    {
+        draw_wins_bordercorners(next);
     }
 }
 
 
 
-static void shift_win_forward()
+static void draw_wins(struct Win * w)
 {
-    if (world.wmeta.active == world.wmeta.chain_end)
+    void (* drawfunc) (struct Win *) = get_drawfunc_by_char(w->id);
+    if      (1 == w->view)
     {
-        world.wmeta.chain_end = world.wmeta.active->prev;
-        world.wmeta.chain_end->next = 0;
-        world.wmeta.active->next = world.wmeta.chain_start;
-        world.wmeta.active->next->prev = world.wmeta.active;
-        world.wmeta.chain_start = world.wmeta.active;
-        world.wmeta.chain_start->prev = 0;
+        drawfunc = draw_winconf_geometry;
     }
-    else
+    else if (2 == w->view)
     {
-        struct Win * old_prev = world.wmeta.active->prev;
-        struct Win * old_next = world.wmeta.active->next;
-        if (world.wmeta.chain_end == world.wmeta.active->next)
-        {
-            world.wmeta.chain_end = world.wmeta.active;
-            world.wmeta.active->next = 0;
-        }
-        else
-        {
-            world.wmeta.active->next = old_next->next;
-            world.wmeta.active->next->prev = world.wmeta.active;
-        }
-        if (world.wmeta.chain_start == world.wmeta.active)
-        {
-            world.wmeta.chain_start = old_next;
-        }
-        else
+        drawfunc = draw_winconf_keybindings;
+    }
+    drawfunc(w);
+    uint16_t size_y = w->winmap_size.y;
+    uint16_t size_x = w->winmap_size.x;
+    uint16_t offset_y = center_offset(w->center.y, size_y, w->frame_size.y);
+    uint16_t offset_x = center_offset(w->center.x, size_x, w->frame_size.x);
+    uint16_t y, x;
+    for (y = offset_y; y < w->frame_size.y + offset_y && y < size_y; y++)
+    {
+        for (x = offset_x; x < w->frame_size.x + offset_x && x < size_x; x++)
         {
-            old_prev->next = old_next;
+            chtype ch = w->winmap[(y * w->winmap_size.x) + x];
+            mvwaddch(world.winDB.v_screen, w->start.y + (y - offset_y),
+                                      w->start.x + (x - offset_x), ch);
         }
-        old_next->prev = old_prev;
-        old_next->next = world.wmeta.active;
-        world.wmeta.active->prev = old_next;
     }
-}
-
-
-
-static void shift_win_backward()
-{
-    if (world.wmeta.active == world.wmeta.chain_start)
+    free(w->winmap); /* NULL so draw_wins.c's try_resize_winmap() may always  */
+    w->winmap = NULL;/* free() it before (re-)allocation, even the first time.*/
+    memset(&w->winmap_size, 0, sizeof(struct yx_uint16));
+    if (offset_y > 0)
+    {
+        winscroll_hint(w, '^', offset_y + 1);
+    }
+    if (size_y > offset_y + w->frame_size.y)
     {
-        world.wmeta.chain_start = world.wmeta.active->next;
-        world.wmeta.chain_start->prev = 0;
-        world.wmeta.active->prev = world.wmeta.chain_end;
-        world.wmeta.active->prev->next = world.wmeta.active;
-        world.wmeta.chain_end = world.wmeta.active;
-        world.wmeta.chain_end->next = 0;
+        winscroll_hint(w, 'v', size_y - ((offset_y + w->frame_size.y) - 1));
     }
-    else
+    if (offset_x > 0)
     {
-        struct Win * old_prev = world.wmeta.active->prev;
-        struct Win * old_next = world.wmeta.active->next;
-        if (world.wmeta.chain_start == world.wmeta.active->prev)
-        {
-            world.wmeta.chain_start = world.wmeta.active;
-            world.wmeta.active->prev = 0;
-        }
-        else
-        {
-            world.wmeta.active->prev = old_prev->prev;
-            world.wmeta.active->prev->next = world.wmeta.active;
-        }
-        if (world.wmeta.chain_end == world.wmeta.active)
-        {
-            world.wmeta.chain_end = old_prev;
-        }
-        else
-        {
-            old_next->prev = old_prev;
-        }
-        old_prev->next = old_next;
-        old_prev->prev = world.wmeta.active;
-        world.wmeta.active->next = old_prev;
+        winscroll_hint(w, '<', offset_x + 1);
+    }
+    if (size_x > offset_x + w->frame_size.x)
+    {
+        winscroll_hint(w, '>', size_x - ((offset_x + w->frame_size.x) - 1));
+    }
+    struct Win * next = get_win_after(w->id);
+    if (next)
+    {
+        draw_wins(next);
     }
 }
 
 
 
-extern void init_wmeta_and_ncurses()
+extern uint8_t get_win_pos_in_order(char c)
 {
-    world.wmeta.screen = initscr();
-    set_cleanup_flag(CLEANUP_NCURSES);
-    noecho();
-    curs_set(0);
-    world.wmeta.padsize.y   = 0;
-    world.wmeta.padsize.x   = 0;
-    world.wmeta.chain_start = 0;
-    world.wmeta.chain_end   = 0;
-    world.wmeta.pad_offset  = 0;
-    world.wmeta.pad         = NULL;
-    world.wmeta.active      = 0;
+    uint8_t i;
+    for (i = 0; c != world.winDB.order[i]; i++);
+    return i;
 }
 
 
 
-extern void make_pad()
+extern struct Win * get_win_after(char c)
 {
-    char * err_s = "make_pad() creates an illegaly large virtual screen.";
-    char * err_m = "make_pad() triggers memory allocation error via newpad().";
-    uint32_t maxy_test = getmaxy(world.wmeta.screen);
-    uint32_t maxx_test = getmaxx(world.wmeta.screen);
-    exit_err(maxy_test > UINT16_MAX || maxx_test > UINT16_MAX, err_s);
-    world.wmeta.padsize.y = maxy_test;
-    world.wmeta.padsize.x = maxx_test;
-    world.wmeta.pad = newpad(world.wmeta.padsize.y, 1);
-    exit_err(NULL == world.wmeta.pad, err_m);
+    return get_win_by_id(world.winDB.order[get_win_pos_in_order(c) + 1]);
 }
 
 
 
-extern void init_win(struct Win ** wp, char * title, int16_t height,
-                     int16_t width, void * func)
+extern uint16_t center_offset(uint16_t position, uint32_t mapsize,
+                              uint32_t frame_size)
 {
-    char * f_name = "init_win()";
-    struct Win * w  = try_malloc(sizeof(struct Win), f_name);
-    w->prev         = 0;
-    w->next         = 0;
-    w->winmapsize.y = 0;
-    w->winmapsize.x = 0;
-    w->winmap       = NULL;
-    w->title        = try_malloc(strlen(title) + 1, f_name);
-    sprintf(w->title, "%s", title);
-    w->draw         = func;
-    w->center.y     = 0;
-    w->center.x     = 0;
-    w->framesize.y  = world.wmeta.padsize.y - 1;
-    if      (0 < height && height <= world.wmeta.padsize.y - 1)
-    {
-        w->framesize.y = height;
-    }
-    else if (0 > height && world.wmeta.padsize.y + (height - 1) > 0)
-    {
-        w->framesize.y = world.wmeta.padsize.y + (height - 1);
-    }
-    w->framesize.x  = world.wmeta.padsize.x;
-    if      (0 < width)
+    uint16_t offset = 0;
+    if (mapsize > frame_size)
     {
-        w->framesize.x = width;
+        if (position > frame_size / 2)
+        {
+            if (position < mapsize - (frame_size / 2))
+            {
+                offset = position - (frame_size / 2);
+            }
+            else
+            {
+                offset = mapsize - frame_size;
+            }
+        }
     }
-    else if (0 > width && world.wmeta.padsize.x + width > 0)
+    return offset;
+}
+
+
+
+extern struct Win * get_win_by_id(char id)
+{
+    uint8_t i = 0;
+    while ('\0' != world.winDB.ids[i])
     {
-        w->framesize.x = world.wmeta.padsize.x + width;
+        if (id == world.winDB.ids[i])
+        {
+            return &world.winDB.wins[i];
+        }
+        i++;
     }
-    *wp = w;
+    return NULL;
 }
 
 
 
-extern void free_win(struct Win * win)
+extern uint8_t read_winconf_from_file(char * line, uint32_t linemax,
+                                      FILE * file)
 {
-    free(win->title);
-    free(win);
+    char * f_name = "read_winconf_from_file()";
+    char * context = "Failed reading individual window's configuration from "
+                     "interface config file. ";
+    char * err_id  = "Illegal ID(s) selected.";
+    char * err_2   = "Double-initialized window.";
+    char * err_brk = "Illegal line break type index.";
+    int test_for_end = try_fgetc(file, f_name);
+    if (EOF == test_for_end || '\n' == test_for_end)
+    {
+        return 0;
+    }
+    exit_trouble(EOF == ungetc(test_for_end, file), f_name, "ungetc()");
+    err_try_fgets(line, linemax, file, context, "ns");
+    err_line(NULL == strchr(world.winDB.legal_ids, line[0]), line, context,
+             err_id);
+    exit_err(world.winDB.ids && NULL!=strchr(world.winDB.ids, line[0]), err_2);
+    struct Win win;
+    memset(&win, 0, sizeof(struct Win));
+    win.id = (char) line[0];
+    err_try_fgets(line, linemax, file, context, "0n");
+    win.title = try_malloc(strlen(line), f_name);
+    memcpy(win.title, line, strlen(line) - 1);      /* Eliminate newline char */
+    win.title[strlen(line) - 1] = '\0';             /* char at end of string. */
+    err_try_fgets(line, linemax, file, context, "0nsi");
+    err_line(atoi(line) > 2, line, context, err_brk);
+    win.linebreak = atoi(line);
+    err_try_fgets(line, linemax, file, context, "0ni");
+    win.target_height = atoi(line);
+    win.target_height_type = (0 >= win.target_height);
+    err_try_fgets(line, linemax, file, context, "0ni");
+    win.target_width = atoi(line);
+    win.target_width_type = (0 >= win.target_width);
+    read_keybindings_from_file(line, linemax, file, &win.kb);
+    if (world.winDB.ids)
+    {
+        uint8_t old_ids_size = strlen(world.winDB.ids);
+        char * new_ids = try_malloc(old_ids_size + 1 + 1, f_name);
+        sprintf(new_ids, "%s%c", world.winDB.ids, win.id);
+        free(world.winDB.ids);
+        world.winDB.ids = new_ids;
+        array_append(old_ids_size, sizeof(struct Win), (void *) &win,
+                     (void **) &world.winDB.wins);
+        return 1;
+    }
+    world.winDB.ids = try_malloc(2, f_name);
+    sprintf(world.winDB.ids, "%c", win.id);
+    world.winDB.wins = try_malloc(sizeof(struct Win), f_name);
+    world.winDB.wins[0] = win;
+    return 1;
 }
 
 
 
-extern void append_win(struct Win * w)
+extern void write_winconf_of_id_to_file(FILE * file, char c)
 {
-    if (0 != world.wmeta.chain_start)
-    {
-        w->prev = world.wmeta.chain_end;
-        world.wmeta.chain_end->next = w;
-    }
-    else
-    {
-        world.wmeta.active = w;
-        world.wmeta.chain_start = w;
-    }
-    world.wmeta.chain_end = w;
-    update_wins(w);
+    char * f_name = "write_winconf_of_id_to_file()";
+    struct Win * wc = get_win_by_id(c);
+    uint8_t size = strlen(wc->title) + 2;
+    if (size < 7)  /* Ensure that at least 5 + 2 char fit into line so that   */
+    {              /* the digit representation of any uint16_t may be stored. */
+        size = 7;
+    }
+    char line[size];
+    sprintf(line, "%c\n", wc->id);
+    try_fwrite(line, sizeof(char), strlen(line), file, f_name);
+    sprintf(line, "%s\n", wc->title);
+    try_fwrite(line, sizeof(char), strlen(line), file, f_name);
+    sprintf(line, "%d\n", wc->linebreak);
+    try_fwrite(line, sizeof(char), strlen(line), file, f_name);
+    sprintf(line, "%d\n", wc->target_height);
+    try_fwrite(line, sizeof(char), strlen(line), file, f_name);
+    sprintf(line, "%d\n", wc->target_width);
+    try_fwrite(line, sizeof(char), strlen(line), file, f_name);
+    write_keybindings_to_file(file, &wc->kb);
 }
 
 
 
-extern void suspend_win(struct Win * w)
+extern void read_order_wins_visible_active(char * line, uint32_t linemax,
+                                           FILE * file, char ** tmp_order,
+                                           char * tmp_active)
 {
-    if (world.wmeta.chain_start != w)
-    {
-        w->prev->next = w->next;
+    char * f_name = "read_order_wins_visible_active()";
+    char * context   = "Failed reading order and activation of visible windows "
+                       "from interface config file. ";
+    char * err_id    = "Illegal ID(s) selected.";
+    err_try_fgets(line, linemax, file, context, "01");
+    uint32_t i = 0;
+    for (; i < strlen(line) - 1; i++)
+    {
+        char * test = strchr(world.winDB.legal_ids, line[i]);
+        err_line(!test, line, context, err_id);
+    }
+    line[strlen(line) - 1] = '\0';
+    *tmp_order = try_malloc(strlen(line) + 1, f_name);
+    sprintf(*tmp_order, "%s", line);
+    if (*tmp_order[0])
+    {
+        err_try_fgets(line, linemax, file, context, "0nfs");
+        err_line(NULL == strchr(*tmp_order, line[0]), line, context, err_id);
+        *tmp_active = line[0];
     }
     else
     {
-        world.wmeta.chain_start = w->next;
-    }
-    uint8_t pad_refitted = 0;
-    if (world.wmeta.chain_end != w)
-    {
-        w->next->prev = w->prev;
-        if (world.wmeta.active == w)
-        {
-            world.wmeta.active = w->next;
-        }
-        update_wins(w->next);      /* Positioning of successor windows may be */
-        pad_refitted = 1;          /* affected / need correction. Note that   */
-    }                              /* update_wins() already refits the pad,   */
-    else                           /* voiding later need for that.            */
-    {
-        world.wmeta.chain_end = w->prev;
-        if (world.wmeta.active == w)
-        {
-            world.wmeta.active = w->prev;
-        }
-    }
-    w->prev = 0;
-    w->next = 0;
-    if (0 == pad_refitted)
-    {
-        refit_pad();
+        err_try_fgets(line, linemax, file, context, "0ne");
+        *tmp_active = '\0';
     }
+    err_try_fgets(line, linemax, file, context, "d");
 }
 
 
 
-extern void reset_pad_offset(uint16_t new_offset)
+extern void write_order_wins_visible_active(FILE * file)
 {
-    if (new_offset >= 0
-        && (new_offset < world.wmeta.pad_offset
-            || new_offset + world.wmeta.padsize.x < getmaxx(world.wmeta.pad)))
-    {
-        world.wmeta.pad_offset = new_offset;
+    char * f_name = "write_order_wins_visible_active()";
+    try_fwrite(world.winDB.order, strlen(world.winDB.order), 1, file, f_name);
+    try_fputc('\n', file, f_name);
+    try_fputc(world.winDB.active, file, f_name);
+    try_fputc('\n', file, f_name);
+    try_fwrite(world.delim, strlen(world.delim), 1, file, f_name);
+}
+
+
+
+extern void make_v_screen_and_init_win_sizes()
+{
+    char * f_name = "make_v_screen_and_init_win_sizes()";
+    char * err_s = "creating an illegaly large virtual screen";
+    char * err_m = "triggering a memory allocation error via newpad()";
+    uint32_t maxy_test = getmaxy(world.winDB.t_screen);
+    uint32_t maxx_test = getmaxx(world.winDB.t_screen);
+    exit_trouble(maxy_test>UINT16_MAX || maxx_test>UINT16_MAX, f_name, err_s);
+    world.winDB.v_screen_size.y = maxy_test;
+    world.winDB.v_screen_size.x = maxx_test;
+    world.winDB.v_screen = newpad(world.winDB.v_screen_size.y, 1);
+    exit_trouble(NULL == world.winDB.v_screen, f_name, err_m);
+    char id;
+    while (0 != (id = get_next_win_id()))
+    {
+        init_win_size_from_winconf_and_v_screen_size(id);
     }
 }
 
 
 
-extern void resize_active_win(struct yx_uint16 size)
+extern void free_winDB()
 {
-    if (0 != world.wmeta.active
-        && size.x > 0 && size.y > 0 && size.y < world.wmeta.padsize.y)
-    {
-        world.wmeta.active->framesize = size;
-        update_wins(world.wmeta.active);          /* Positioning of following */
-    }                                             /* windows may be affected. */
+    char id;
+    while (0 != (id = get_next_win_id()))
+    {
+        struct Win * wc = get_win_by_id(id);
+        free(wc->title);
+        free(wc->kb.kbs);
+        wc->kb.kbs = NULL;
+    }
+    free(world.winDB.ids); /* NULL this since read_winconf_from_file() checks */
+    world.winDB.ids = NULL;/* for it to detect its first post-DB-purge round. */
+    free(world.winDB.wins);
+    free(world.winDB.order);
 }
 
 
 
-extern void cycle_active_win(char dir)
+extern void winch_called()
 {
-    if (0 != world.wmeta.active)
-    {
-        if ('f' == dir)
-        {
-            if (world.wmeta.active->next != 0)
-            {
-                world.wmeta.active = world.wmeta.active->next;
-            }
-            else
-            {
-                world.wmeta.active = world.wmeta.chain_start;
-            }
-        }
-        else
-        {
-            if (world.wmeta.active->prev != 0)
-            {
-                world.wmeta.active = world.wmeta.active->prev;
-            }
-            else
-            {
-                world.wmeta.active = world.wmeta.chain_end;
-            }
-        }
-    }
+    world.winch = 1;
 }
 
 
 
-extern void shift_active_win(char dir)
+extern void reset_windows_on_winch()
 {
-    if (   0 == world.wmeta.active  /* No shifting with < 2 windows visible. */
-        || world.wmeta.chain_start == world.wmeta.chain_end)
-    {
-        return;
-    }
-    if ('f' == dir)
-    {
-        shift_win_forward();
-        update_wins(world.wmeta.chain_start);
-        return;
-    }
-    shift_win_backward();
-    update_wins(world.wmeta.chain_start);
+    endwin();  /* "[S]tandard way" to recalibrate ncurses post SIGWINCH, says */
+    refresh(); /* <http://invisible-island.net/ncurses/ncurses-intro.html>.   */
+    char tmp_order[strlen(world.winDB.order) + 1];
+    sprintf(tmp_order, "%s", world.winDB.order);
+    uint8_t i;
+    char tmp_active = world.winDB.active;
+    for (i = 0; i < strlen(tmp_order); toggle_window(tmp_order[i]), i++);
+    delwin(world.winDB.v_screen);
+    make_v_screen_and_init_win_sizes();
+    for (i = 0; i < strlen(tmp_order); toggle_window(tmp_order[i]), i++);
+    world.winDB.active = tmp_active;
 }
 
 
@@ -636,33 +587,41 @@ extern void draw_all_wins()
 {
     /* Empty everything before filling it a-new. */
     erase();
-    wnoutrefresh(world.wmeta.screen);
-    werase(world.wmeta.pad);
-    if (world.wmeta.chain_start)
-    {
-
-        /* Draw windows' borders first, then windows. */
-        draw_wins_borderlines(world.wmeta.chain_start);
-        draw_wins_bordercorners(world.wmeta.chain_start);
-        draw_wins(world.wmeta.chain_start);
-
-        /* Draw virtual screen scroll hints. */
-        if (world.wmeta.pad_offset > 0)
+    wnoutrefresh(world.winDB.t_screen);
+    werase(world.winDB.v_screen);
+    if (world.winDB.active)
+    {
+
+        /* Draw borders, wins. Order matters: corners should overwrite lines. */
+        draw_wins_borderlines(get_win_by_id(world.winDB.order[0]));
+        draw_wins_bordercorners(get_win_by_id(world.winDB.order[0]));
+        draw_wins(get_win_by_id(world.winDB.order[0]));
+
+        /* Draw .v_screen scroll hints. */
+        struct yx_uint16 start;
+        start.y = 0;
+        start.x = world.winDB.v_screen_offset;
+        char * cols_string = "columns";
+        if (world.winDB.v_screen_offset > 0)
         {
-            padscroll_hint('<', world.wmeta.pad_offset + 1);
+            scroll_hint(world.winDB.v_screen_size, '<',
+                        world.winDB.v_screen_offset + 1, cols_string, start);
         }
-        uint16_t size_x = getmaxx(world.wmeta.pad);
-        uint16_t right_edge = world.wmeta.pad_offset + world.wmeta.padsize.x;
+        uint16_t size_x = getmaxx(world.winDB.v_screen);
+        uint16_t right_edge =   world.winDB.v_screen_offset
+                              + world.winDB.v_screen_size.x;
         if (right_edge < size_x - 1)
         {
-            padscroll_hint('>', size_x - right_edge);
+            scroll_hint(world.winDB.v_screen_size, '>',
+                        size_x - right_edge, cols_string, start);
         }
 
-        /* Write pad segment to be shown on physical screen to screen buffer. */
-        pnoutrefresh(world.wmeta.pad, 0, world.wmeta.pad_offset, 0, 0,
-                     world.wmeta.padsize.y, world.wmeta.padsize.x - 1);
+        /* Put .v_screen segment to be shown on .t_screen to .t_screen buffer.*/
+        pnoutrefresh(world.winDB.v_screen, 0, world.winDB.v_screen_offset, 0, 0,
+                     world.winDB.v_screen_size.y,
+                     world.winDB.v_screen_size.x - 1);
     }
 
-    /* Only at the end write accumulated changes to the physical screen. */
+    /* Only at the end write accumulated changes to .t_screen. */
     doupdate();
 }