added support for the "magic margin", changed c.hide to c.state, changed xcursor() to use term instead of a

parameter and fixed the cursor position after setting a scrolling region.

1 files changed, 28 insertions, 22 deletions

diff --git a/st.c b/st.c
index 6a51581..6dcded5 100644
--- a/st.c
+++ b/st.c
@@ -46,8 +46,9 @@
 
 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
-enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE = 1, 
-       CURSOR_DRAW = 0, CURSOR_SAVE, CURSOR_LOAD };
+enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
+       CURSOR_SAVE, CURSOR_LOAD };
+enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
@@ -67,7 +68,7 @@ typedef struct {
         Glyph attr;      /* current char attributes */
         int x;
         int y;
-        char hide;
+        char state;
 } TCursor;
 
 /* CSI Escape sequence structs */
@@ -164,7 +165,7 @@ static void xbell(void);
 static void xdraws(char *, Glyph, int, int, int);
 static void xhints(void);
 static void xclear(int, int, int, int);
-static void xcursor(int);
+static void xcursor(void);
 static void xinit(void);
 static void xloadcols(void);
 
@@ -329,7 +330,7 @@ treset(void) {
                 .mode = ATTR_NULL, 
                 .fg = DefaultFG, 
                 .bg = DefaultBG
-        }, .x = 0, .y = 0, .hide = 0};
+        }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
         
         term.top = 0, term.bot = term.row - 1;
         term.mode = MODE_WRAP;
@@ -414,8 +415,11 @@ csiparse(void) {
 
 void
 tmoveto(int x, int y) {
-        term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
-        term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
+        LIMIT(x, 0, term.col-1);
+        LIMIT(y, 0, term.row-1);
+        term.c.state &= ~CURSOR_WRAPNEXT;
+        term.c.x = x;
+        term.c.y = y;
 }
 
 void
@@ -711,7 +715,7 @@ csihandle(void) {
                         case 12: /* att610 -- Stop blinking cursor (IGNORED) */
                                 break;
                         case 25:
-                                term.c.hide = CURSOR_HIDE;
+                                term.c.state |= CURSOR_HIDE;
                                 break;
                         case 1048: /* XXX: no alt. screen to erase/save */
                         case 1049:
@@ -760,7 +764,7 @@ csihandle(void) {
                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
                                 break;
                         case 25:
-                                term.c.hide = CURSOR_DRAW;
+                                term.c.state &= ~CURSOR_HIDE;
                                 break;
                         case 1048: 
                         case 1049: /* XXX: no alt. screen to erase/save */
@@ -788,6 +792,7 @@ csihandle(void) {
                         DEFAULT(escseq.arg[0], 1);
                         DEFAULT(escseq.arg[1], term.row);
                         tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
+                        tmoveto(0, 0);
                 }
                 break;
         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
@@ -932,11 +937,13 @@ tputc(char c) {
                         term.esc = ESC_START;
                         break;
                 default:
+                        if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
+                                tnewline();
                         tsetchar(c);
-                        if(term.c.x+1 < term.col) {
+                        if(term.c.x+1 < term.col)
                                 tmoveto(term.c.x+1, term.c.y);
-                        } else if(IS_SET(MODE_WRAP))
-                                tnewline();
+                        else
+                                term.c.state |= CURSOR_WRAPNEXT;
                         break;
                 }
         }
@@ -974,13 +981,12 @@ tresize(int col, int row) {
         for(/* i == minrow */; i < row; i++)
                 term.line[i] = calloc(col, sizeof(Glyph));
         
-        LIMIT(term.c.x, 0, col-1);
-        LIMIT(term.c.y, 0, row-1);
-        LIMIT(term.top, 0, row-1);
-        LIMIT(term.bot, 0, row-1);
-        
-        term.bot = row-1;
+        /* update terminal size */
         term.col = col, term.row = row;
+        /* make use of the LIMIT in tmoveto */
+        tmoveto(term.c.x, term.c.y);
+        /* reset scrolling region */
+        tsetscroll(0, row-1);
 }
 
 void
@@ -1112,7 +1118,7 @@ xdraws(char *s, Glyph base, int x, int y, int len) {
 }
 
 void
-xcursor(int mode) {
+xcursor(void) {
         static int oldx = 0;
         static int oldy = 0;
         Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
@@ -1130,7 +1136,7 @@ xcursor(int mode) {
                 xclear(oldx, oldy, oldx, oldy);
         
         /* draw the new one */
-        if(mode == CURSOR_DRAW) {
+        if(!(term.c.state & CURSOR_HIDE)) {
                 xdraws(&g.c, g, term.c.x, term.c.y, 1);
                 oldx = term.c.x, oldy = term.c.y;
         }
@@ -1157,7 +1163,7 @@ draw(int dummy) {
                         if(term.line[y][x].state & GLYPH_SET)
                                 xdrawc(x, y, term.line[y][x]);
 
-        xcursor(term.c.hide);
+        xcursor();
         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
         XFlush(xw.dis);
 }
@@ -1193,7 +1199,7 @@ draw(int redraw_all) {
                 if(i > 0)
                         xdraws(buf, base, ox, y, i);
         }
-        xcursor(term.c.hide);
+        xcursor();
         XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
         XFlush(xw.dis);
 }