termptyesc: support DECFI

Introduce different behaviour from xterm as I don't see why it behaves
like that when outside of left/right margin and on right border. Xterm
does not wrap.

src/bin/termptyesc.c

@@ -2827,7 +2827,7 @@ _handle_decbi(Termpty *ty)
         ty->cursor_state.cx = old_cx;
         ty->cursor_state.cy = old_cy;
      }
-     else
+   else
      {
         if ((ty->cursor_state.cx == 0) && (ty->termstate.lr_margins != 0))
           return;
@@ -2836,6 +2836,65 @@ _handle_decbi(Termpty *ty)
      }
 }
 
+static void
+_handle_decfi(Termpty *ty)
+{
+   DBG("DECFI - Forward Index");
+   if ((ty->cursor_state.cx == ty->w - 1)
+       || ((ty->termstate.right_margin > 0)
+           && (ty->cursor_state.cx == ty->termstate.right_margin - 1)))
+     {
+        int y;
+        int max_x = ty->w - 1;
+        int max_y = ty->h;
+
+        if (((ty->termstate.lr_margins != 0)
+             && (ty->cursor_state.cx == ty->w - 1))
+            || ((ty->termstate.top_margin != 0)
+                && (ty->cursor_state.cy < ty->termstate.top_margin))
+            || ((ty->termstate.bottom_margin != 0)
+                && (ty->cursor_state.cy >= ty->termstate.bottom_margin)))
+          {
+             return;
+          }
+        if (ty->termstate.bottom_margin != 0)
+          max_y = ty->termstate.bottom_margin;
+        if (ty->termstate.right_margin != 0)
+          max_x = ty->termstate.right_margin - 1;
+
+        for (y = ty->termstate.top_margin; y < max_y; y++)
+          {
+             int x;
+             Termcell *cells = &(TERMPTY_SCREEN(ty, 0, y));
+
+             for (x = ty->termstate.left_margin; x <= max_x; x++)
+               {
+                  if (x < max_x)
+                    TERMPTY_CELL_COPY(ty, &(cells[x + 1]), &(cells[x]), 1);
+                  else
+                    {
+                       cells[x].codepoint = ' ';
+                       if (EINA_UNLIKELY(cells[x].att.link_id))
+                         term_link_refcount_dec(ty, cells[x].att.link_id, 1);
+                       cells[x].att = ty->termstate.att;
+                       cells[x].att.link_id = 0;
+                       cells[x].att.dblwidth = 0;
+                    }
+               }
+          }
+     }
+   else
+     {
+        if ((ty->cursor_state.cx == ty->w - 1)
+            && (ty->termstate.lr_margins != 0))
+          return;
+        ERR("ty->cursor_state.cx=%d", ty->cursor_state.cx);
+        ERR("ty->cursor_state.cy=%d", ty->cursor_state.cy);
+        /* cursor forward */
+        ty->cursor_state.cx++;
+     }
+}
+
 static int
 _handle_esc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
 {
@@ -2939,6 +2998,9 @@ _handle_esc(Termpty *ty, const Eina_Unicode *c, const Eina_Unicode *ce)
       case '8': // restore cursor pos
         termpty_cursor_copy(ty, EINA_FALSE);
         return 1;
+      case '9':
+        _handle_decfi(ty);
+        return 1;
       case 'H': // set tab at current column
         DBG("Character Tabulation Set (HTS) at x:%d", ty->cursor_state.cx);
         TAB_SET(ty, ty->cursor_state.cx);

tests/decbi.sh

@@ -29,7 +29,7 @@ printf '\033[5;22r'
 
 # move to
 printf '\033[4;0H'
-# decbi, not within top/right margin, do nothing
+# decbi, not within top/bottom margin, do nothing
 printf '\033\066b'
 # move to 3; 0
 printf '\033[6;0H'

tests/decfi.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+
+# move to 0; 0
+printf '\033[H'
+# fill space
+for _ in $(seq 0 23); do
+   for _ in $(seq 0 7); do
+      printf '\-/|\\~_>^<'
+   done
+done
+
+# move to 0; 0
+printf '\033[H'
+
+#set color
+printf '\033[46;31;3m'
+
+printf '   format is:\n   \-/|\\~_>^<'
+
+# move to
+printf '\033[3;81H'
+# decfi, insert column
+printf '\033\071a'
+
+# set top/bottom margins:
+printf '\033[5;22r'
+
+# move to
+printf '\033[4;81H'
+# decfi, not within top/bottom margin, do nothing
+printf '\033\071b'
+# move to 3; 0
+printf '\033[6;81H'
+# decfi, insert column within margins
+printf 'C\033\071c'
+
+
+# set top/bottom margins:
+printf '\033[10;20r'
+# allow left/right margins
+printf '\033[?69h'
+
+# move
+printf '\033[7;81H'
+# decfi, do nothing
+printf 'D\033\071d'
+
+# set right margin only
+printf '\033[;14s'
+
+# move
+printf '\033[8;81H'
+# decfi, do nothing. Xterm seems change wrapping here. I don't see why
+printf 'E\033\071e'
+
+
+# set left/right margins:
+printf '\033[5;14s'
+# move to 0; 0
+printf '\033[10;5H'
+# fill space
+for Y in $(seq 10 20); do
+    # move to 0; 0
+    printf '\033[%s;5H' "$Y"
+    printf '\-/|\\~_>^<'
+done
+
+# move
+printf '\033[11;81H'
+# decfi, do nothing. Xterm seems change wrapping here. I don't see why
+printf 'f\033\071g'
+
+# move
+printf '\033[12;12H'
+#decfi, outside right margin, cursor forward
+printf 'h\033\071i'
+
+# move
+printf '\033[13;3H'
+#decfi, outside right margin, cursor forward
+printf '\033\071j'
+
+# move
+printf '\033[14;14H'
+#decfi, on left margin, insert column
+printf '\033\071k'

tests/tests.results

@@ -38,3 +38,4 @@ cup.sh 11f5939a6cc990f6a7b9d1730ab3a8bf
 decaln.sh 9c0cf4de336193bcdaed6ba6c0d6f590
 decawm.sh 84321e76f07b40cf9462238ec0919dc0
 decbi.sh 8153bff12a0d529cb8ba0dbff036a1ee
+decfi.sh e93690447902b923d3d9d2ae72a31de4