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[Emacs-diffs] scratch/extend_face_id 30fe702 06/13: Add space for cursor


From: Jimmy Aguilar Mena
Subject: [Emacs-diffs] scratch/extend_face_id 30fe702 06/13: Add space for cursor to work also in terminal.
Date: Sun, 29 Sep 2019 15:24:47 -0400 (EDT)

branch: scratch/extend_face_id
commit 30fe7022472f1c5c8763fc637e2a84ed61e465fb
Author: Jimmy Aguilar Mena <address@hidden>
Commit: Jimmy Aguilar Mena <address@hidden>

    Add space for cursor to work also in terminal.
    
    * src/xdisp.c (append_space_for_newline): Modified to add the space
    with the last face also in terminal interface.
    (fill_column_indicator_column): Modified to group more conditions.
    (extend_face_to_end_of_line): Simplified code in
    fill_column_indicator to use the new function.
---
 src/xdisp.c | 255 ++++++++++++++++++++++++++++++------------------------------
 1 file changed, 126 insertions(+), 129 deletions(-)

diff --git a/src/xdisp.c b/src/xdisp.c
index bfd828f..6cbd09e 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -431,7 +431,7 @@ static Lisp_Object list_of_error;
    met, return the (nonnegative) column number, else return a negative
    value.  */
 static int
-fill_column_indicator_column (struct it *it)
+fill_column_indicator_column (struct it *it, int char_width)
 {
   if (Vdisplay_fill_column_indicator
       && it->continuation_lines_width == 0
@@ -440,8 +440,16 @@ fill_column_indicator_column (struct it *it)
       Lisp_Object col = (EQ (Vdisplay_fill_column_indicator_column, Qt)
                         ? BVAR (current_buffer, fill_column)
                         : Vdisplay_fill_column_indicator_column);
+
+      /* The stretch width needs to considet the latter
+        added glyph in append_space_for_newline.  */
       if (RANGED_FIXNUMP (0, col, INT_MAX))
-       return XFIXNUM (col);
+       {
+          int icol = XFIXNUM (col);
+         if (!INT_MULTIPLY_WRAPV (char_width, icol, &icol)
+             && !INT_ADD_WRAPV (it->lnum_pixel_width, icol, &icol))
+           return icol;
+       }
     }
   return -1;
 }
@@ -4201,7 +4209,7 @@ handle_face_prop_general (struct it *it, int 
initial_face_id,
                                             bufpos,
                                             &next_stop,
                                             base_face_id, false);
-    }
+    } /* !is_string.  */
 
   /* Is this a start of a run of characters with box face?
      Caveat: this can be called for a freshly initialized
@@ -20267,97 +20275,94 @@ compute_line_metrics (struct it *it)
 static bool
 append_space_for_newline (struct it *it, bool default_face_p)
 {
-#ifdef HAVE_WINDOW_SYSTEM
-  if (FRAME_WINDOW_P (it->f))
+  int n = it->glyph_row->used[TEXT_AREA];
+
+  if (it->glyph_row->glyphs[TEXT_AREA] + n
+      < it->glyph_row->glyphs[1 + TEXT_AREA])
     {
-      int n = it->glyph_row->used[TEXT_AREA];
-
-      if (it->glyph_row->glyphs[TEXT_AREA] + n
-         < it->glyph_row->glyphs[1 + TEXT_AREA])
-       {
-         /* Save some values that must not be changed.
-            Must save IT->c and IT->len because otherwise
-            ITERATOR_AT_END_P wouldn't work anymore after
-            append_space_for_newline has been called.  */
-         enum display_element_type saved_what = it->what;
-         int saved_c = it->c, saved_len = it->len;
-         int saved_char_to_display = it->char_to_display;
-         int saved_x = it->current_x;
-         int saved_face_id = it->face_id;
-         bool saved_box_end = it->end_of_box_run_p;
-         struct text_pos saved_pos;
-         Lisp_Object saved_object;
-         struct face *face;
+      /* Save some values that must not be changed.
+        Must save IT->c and IT->len because otherwise
+        ITERATOR_AT_END_P wouldn't work anymore after
+        append_space_for_newline has been called.  */
+      enum display_element_type saved_what = it->what;
+      int saved_c = it->c, saved_len = it->len;
+      int saved_char_to_display = it->char_to_display;
+      int saved_x = it->current_x;
+      int saved_face_id = it->face_id;
+      bool saved_box_end = it->end_of_box_run_p;
+      struct text_pos saved_pos = it->position;
+      Lisp_Object saved_object = it->object;
+      struct face *face;
+
+      it->what = IT_CHARACTER;
+      memset (&it->position, 0, sizeof it->position);
+      it->object = Qnil;
+      it->len = 1;
 
-         saved_object = it->object;
-         saved_pos = it->position;
+      int local_default_face_id =
+       lookup_basic_face (it->w, it->f, DEFAULT_FACE_ID);
+      struct face* default_face =
+       FACE_FROM_ID (it->f, local_default_face_id);
 
-         it->what = IT_CHARACTER;
-         memset (&it->position, 0, sizeof it->position);
-         it->object = Qnil;
-         it->len = 1;
+      /* Corner case for when display-fill-column-indicator-mode
+        is active and the extra character should be added in the
+        same place than the line.  */
 
-         int local_default_face_id =
-           lookup_basic_face (it->w, it->f, DEFAULT_FACE_ID);
-         struct face* default_face =
-           FACE_FROM_ID_OR_NULL (it->f, local_default_face_id);
-
-         /* Corner case for when display-fill-column-indicator-mode
-            is active and the extra character should be added in the
-            same place than the line.  */
-         int indicator_column = (it->w->pseudo_window_p == 0
-                                 ? fill_column_indicator_column (it)
-                                 : -1);
-         if (indicator_column >= 0)
-           {
-              struct font *font = (default_face->font
-                                   ? default_face->font
-                                   : FRAME_FONT (it->f));
-              const int char_width = (font->average_width
-                                      ? font->average_width
-                                      : font->space_width);
-              int column_x;
-
-              if (!INT_MULTIPLY_WRAPV (indicator_column, char_width,
-                                       &column_x)
-                  && !INT_ADD_WRAPV (it->lnum_pixel_width, column_x,
-                                     &column_x)
-                  && it->current_x == column_x)
-                {
-                  it->c = it->char_to_display
-                    = XFIXNAT (Vdisplay_fill_column_indicator_character);
-                  it->face_id
-                    = merge_faces (it->w, Qfill_column_indicator,
-                                   0, saved_face_id);
-                  face = FACE_FROM_ID (it->f, it->face_id);
-                  goto produce_glyphs;
-                }
-           }
-
-         it->c = it->char_to_display = ' ';
-         /* If the default face was remapped, be sure to use the
-            remapped face for the appended newline.  */
-         if (default_face_p)
-           it->face_id = local_default_face_id;
-         else if (it->face_before_selective_p)
-           it->face_id = it->saved_face_id;
+      int char_width = 1;
 
+#ifdef HAVE_WINDOW_SYSTEM
+      if (FRAME_WINDOW_P (it->f))
+       {
+         struct font *font = (default_face->font
+                              ? default_face->font
+                              : FRAME_FONT (it->f));
+         char_width = (font->average_width
+                       ? font->average_width
+                       : font->space_width);
+       }
+#endif
+      const int indicator_column =
+       (it->w->pseudo_window_p == 0
+        ? fill_column_indicator_column (it, char_width)
+        : -1);
+
+      if (it->current_x == indicator_column)
+       {
+         it->c = it->char_to_display
+           = XFIXNAT (Vdisplay_fill_column_indicator_character);
+         it->face_id
+           = merge_faces (it->w, Qfill_column_indicator,
+                          0, saved_face_id);
          face = FACE_FROM_ID (it->f, it->face_id);
-         it->face_id = FACE_FOR_CHAR (it->f, face, 0, -1, Qnil);
-         /* In R2L rows, we will prepend a stretch glyph that will
-            have the end_of_box_run_p flag set for it, so there's no
-            need for the appended newline glyph to have that flag
-            set.  */
-         if (it->glyph_row->reversed_p
-             /* But if the appended newline glyph goes all the way to
-                the end of the row, there will be no stretch glyph,
-                so leave the box flag set.  */
-             && saved_x + FRAME_COLUMN_WIDTH (it->f) < it->last_visible_x)
-           it->end_of_box_run_p = false;
-
-       produce_glyphs:
-         PRODUCE_GLYPHS (it);
+         goto produce_glyphs;
+       }
 
+      it->c = it->char_to_display = ' ';
+      /* If the default face was remapped, be sure to use the
+        remapped face for the appended newline.  */
+      it->face_id = default_face_p
+       ? local_default_face_id
+       : it->saved_face_id;
+
+
+      face = FACE_FROM_ID (it->f, it->face_id);
+      it->face_id = FACE_FOR_CHAR (it->f, face, 0, -1, Qnil);
+      /* In R2L rows, we will prepend a stretch glyph that will
+        have the end_of_box_run_p flag set for it, so there's no
+        need for the appended newline glyph to have that flag
+        set.  */
+      if (it->glyph_row->reversed_p
+          /* But if the appended newline glyph goes all the way to
+            the end of the row, there will be no stretch glyph,
+            so leave the box flag set.  */
+          && saved_x + FRAME_COLUMN_WIDTH (it->f) < it->last_visible_x)
+       it->end_of_box_run_p = false;
+
+    produce_glyphs:
+      PRODUCE_GLYPHS (it);
+#ifdef HAVE_WINDOW_SYSTEM
+      if (FRAME_WINDOW_P (it->f))
+       {
          /* Make sure this space glyph has the right ascent and
             descent values, or else cursor at end of line will look
             funny, and height of empty lines will be incorrect.  */
@@ -20378,8 +20383,8 @@ append_space_for_newline (struct it *it, bool 
default_face_p)
                 gui_produce_glyph for newline characters.  */
              height = get_it_property (it, Qline_height);
              if (CONSP (height)
-                 && CONSP (XCDR (height))
-                 && NILP (XCDR (XCDR (height))))
+                 && CONSP (XCDR (height))
+                 && NILP (XCDR (XCDR (height))))
                {
                  total_height = XCAR (XCDR (height));
                  height = XCAR (height);
@@ -20408,12 +20413,12 @@ append_space_for_newline (struct it *it, bool 
default_face_p)
 
                  if (!NILP (total_height))
                    spacing = calc_line_height_property (it, total_height, font,
-                                                        boff, false);
+                                                        boff, false);
                  else
                    {
                      spacing = get_it_property (it, Qline_spacing);
                      spacing = calc_line_height_property (it, spacing, font,
-                                                          boff, false);
+                                                          boff, false);
                    }
                  if (FIXNUMP (spacing))
                    {
@@ -20436,22 +20441,21 @@ append_space_for_newline (struct it *it, bool 
default_face_p)
 
          g->ascent = it->max_ascent;
          g->descent = it->max_descent;
-
-         it->override_ascent = -1;
-         it->constrain_row_ascent_descent_p = false;
-         it->current_x = saved_x;
-         it->object = saved_object;
-         it->position = saved_pos;
-         it->what = saved_what;
-         it->face_id = saved_face_id;
-         it->len = saved_len;
-         it->c = saved_c;
-         it->char_to_display = saved_char_to_display;
-         it->end_of_box_run_p = saved_box_end;
-         return true;
        }
+#endif // HAVE_WINDOW_SYSTEM
+      it->override_ascent = -1;
+      it->constrain_row_ascent_descent_p = false;
+      it->current_x = saved_x;
+      it->object = saved_object;
+      it->position = saved_pos;
+      it->what = saved_what;
+      it->face_id = saved_face_id;
+      it->len = saved_len;
+      it->c = saved_c;
+      it->char_to_display = saved_char_to_display;
+      it->end_of_box_run_p = saved_box_end;
+      return true;
     }
-#endif
 
   return false;
 }
@@ -20565,9 +20569,6 @@ extend_face_to_end_of_line (struct it *it)
          /* Display fill column indicator if not in modeline or
             toolbar and display fill column indicator mode is
             active.  */
-         const int indicator_column = (it->w->pseudo_window_p == 0
-                                 ? fill_column_indicator_column (it)
-                                 : -1);
 
          struct font *font = (default_face->font
                               ? default_face->font
@@ -20576,7 +20577,11 @@ extend_face_to_end_of_line (struct it *it)
          const int char_width = (font->average_width
                                  ? font->average_width
                                  : font->space_width);
-         int column_x;
+
+         const int indicator_column =
+           (it->w->pseudo_window_p == 0
+            ? fill_column_indicator_column (it, char_width)
+            : -1);
 
          const char saved_char = it->char_to_display;
          const struct text_pos saved_pos = it->position;
@@ -20586,22 +20591,18 @@ extend_face_to_end_of_line (struct it *it)
          const int saved_face_id = it->face_id;
 
          it->face_id = it->extend_face_id;
+         it->avoid_cursor_p = true;
+         it->object = Qnil;
 
          if (indicator_column >= 0
-             && !INT_MULTIPLY_WRAPV (indicator_column, char_width, &column_x)
-             && !INT_ADD_WRAPV (it->lnum_pixel_width, column_x, &column_x)
-             && column_x >= it->current_x
-             && column_x <= it->last_visible_x)
+             && indicator_column > it->current_x
+             && indicator_column < it->last_visible_x)
             {
 
-             /* The stretch width needs to considet the latter
-                added glyph.  */
-             const int stretch_width
-               = column_x - it->current_x - char_width;
+             const int stretch_width =
+               indicator_column - it->current_x - char_width;
 
              memset (&it->position, 0, sizeof it->position);
-             it->avoid_cursor_p = true;
-             it->object = Qnil;
 
              /* Only generate a stretch glyph if there is distance
                 between current_x and and the indicator position.  */
@@ -20616,7 +20617,7 @@ extend_face_to_end_of_line (struct it *it)
 
              /* Generate the glyph indicator only if
                 append_space_for_newline didn't already.  */
-             if (it->current_x < column_x)
+             if (it->current_x < indicator_column)
                {
                  const int save_face_id = it->face_id;
                  it->char_to_display
@@ -20626,7 +20627,6 @@ extend_face_to_end_of_line (struct it *it)
                                   0, it->extend_face_id);
                  PRODUCE_GLYPHS (it);
                  it->face_id = save_face_id;
-
                }
             }
 
@@ -20761,14 +20761,13 @@ extend_face_to_end_of_line (struct it *it)
                      default_face->id : face->id);
 
       /* Display fill-column indicator if needed.  */
-      int indicator_column = fill_column_indicator_column (it);
-      if (indicator_column >= 0
-         && INT_ADD_WRAPV (it->lnum_pixel_width, indicator_column,
-                           &indicator_column))
-       indicator_column = -1;
+      const int indicator_column =
+       fill_column_indicator_column (it, 1) - 1;
       do
        {
-         if (it->current_x == indicator_column)
+         if (it->current_x != indicator_column)
+           PRODUCE_GLYPHS (it);
+         else
            {
              int saved_face_id = it->face_id;
              it->face_id
@@ -20781,8 +20780,6 @@ extend_face_to_end_of_line (struct it *it)
              it->face_id = saved_face_id;
              it->c = it->char_to_display = ' ';
            }
-         else
-           PRODUCE_GLYPHS (it);
        }
       while (it->current_x <= it->last_visible_x);
 



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