Remove FEAT_DIFF

Support for vim's diff mode.

config/config.h.in

@@ -116,7 +116,6 @@
 #define FEAT_CON_DIALOG
 #define FEAT_CSCOPE
 #define FEAT_CURSORBIND
-#define FEAT_DIFF
 #define FEAT_DIGRAPHS
 #define FEAT_EVAL
 #define FEAT_EX_EXTRA

src/nvim/option.c

@@ -353,17 +353,14 @@ struct vimoption {
  * for the currency sign. */
 # define ISP_LATIN1 (char_u *)"@,161-255"
 
-/* The 16 bit MS-DOS version is low on space, make the string as short as
- * possible when compiling with few features. */
-#if defined(FEAT_DIFF) || defined(FEAT_FOLDING) || defined(FEAT_SPELL) \
-  || defined(FEAT_VERTSPLIT) \
-  || defined(FEAT_INS_EXPAND) || defined(FEAT_SYN_HL) || defined(FEAT_CONCEAL)
-# define HIGHLIGHT_INIT \
-  "8:SpecialKey,@:NonText,d:Directory,e:ErrorMsg,i:IncSearch,l:Search,m:MoreMsg,M:ModeMsg,n:LineNr,N:CursorLineNr,r:Question,s:StatusLine,S:StatusLineNC,c:VertSplit,t:Title,v:Visual,V:VisualNOS,w:WarningMsg,W:WildMenu,f:Folded,F:FoldColumn,A:DiffAdd,C:DiffChange,D:DiffDelete,T:DiffText,>:SignColumn,-:Conceal,B:SpellBad,P:SpellCap,R:SpellRare,L:SpellLocal,+:Pmenu,=:PmenuSel,x:PmenuSbar,X:PmenuThumb,*:TabLine,#:TabLineSel,_:TabLineFill,!:CursorColumn,.:CursorLine,o:ColorColumn"
-#else
-# define HIGHLIGHT_INIT \
-  "8:SpecialKey,@:NonText,d:Directory,e:ErrorMsg,i:IncSearch,l:Search,m:MoreMsg,M:ModeMsg,n:LineNr,N:CursorLineNr,r:Question,s:StatusLine,S:StatusLineNC,t:Title,v:Visual,w:WarningMsg,W:WildMenu,>:SignColumn,*:TabLine,#:TabLineSel,_:TabLineFill"
-#endif
+#define HIGHLIGHT_INIT \
+  "8:SpecialKey,@:NonText,d:Directory,e:ErrorMsg,i:IncSearch,l:Search," \
+  "m:MoreMsg,M:ModeMsg,n:LineNr,N:CursorLineNr,r:Question,s:StatusLine," \
+  "S:StatusLineNC,c:VertSplit,t:Title,v:Visual,V:VisualNOS,w:WarningMsg," \
+  "W:WildMenu,f:Folded,F:FoldColumn,A:DiffAdd,C:DiffChange,D:DiffDelete," \
+  "T:DiffText,>:SignColumn,-:Conceal,B:SpellBad,P:SpellCap,R:SpellRare," \
+  "L:SpellLocal,+:Pmenu,=:PmenuSel,x:PmenuSbar,X:PmenuThumb,*:TabLine," \
+  "#:TabLineSel,_:TabLineFill,!:CursorColumn,.:CursorLine,o:ColorColumn"
 
 /*
  * options[] is initialized here.

src/nvim/screen.c

@@ -2301,11 +2301,7 @@ win_line (
   int change_end = -1;                  /* last col of changed area */
   colnr_T trailcol = MAXCOL;            /* start of trailing spaces */
   int need_showbreak = FALSE;
-#if defined(FEAT_SIGNS) || defined(FEAT_QUICKFIX) \
-  || defined(FEAT_SYN_HL) || defined(FEAT_DIFF)
-# define LINE_ATTR
   int line_attr = 0;                    /* attribute for the whole line */
-#endif
   matchitem_T *cur;                     /* points to the match list */
   match_T     *shl;                     /* points to search_hl or a match */
   int shl_flag;                         /* flag to indicate whether search_hl
@@ -2315,9 +2311,7 @@ win_line (
                                            of the matches */
   int prev_c = 0;                       /* previous Arabic character */
   int prev_c1 = 0;                      /* first composing char for prev_c */
-#if defined(LINE_ATTR)
   int did_line_attr = 0;
-#endif
 
   /* draw_state: items that are drawn in sequence: */
 #define WL_START        0               /* nothing done yet */
@@ -2518,7 +2512,6 @@ win_line (
     filler_lines = wp->w_topfill;
   filler_todo = filler_lines;
 
-#ifdef LINE_ATTR
   /* If this line has a sign with line highlighting set line_attr. */
   v = buf_getsigntype(wp->w_buffer, lnum, SIGN_LINEHL);
   if (v != 0)
@@ -2529,7 +2522,6 @@ win_line (
     line_attr = hl_attr(HLF_L);
   if (line_attr != 0)
     area_highlighting = TRUE;
-#endif
 
   line = ml_get_buf(wp->w_buffer, lnum, FALSE);
   ptr = line;
@@ -3036,14 +3028,12 @@ win_line (
         char_attr = area_attr;
       else if (search_attr != 0)
         char_attr = search_attr;
-#ifdef LINE_ATTR
       /* Use line_attr when not in the Visual or 'incsearch' area
        * (area_attr may be 0 when "noinvcur" is set). */
       else if (line_attr != 0 && ((fromcol == -10 && tocol == MAXCOL)
                                   || vcol < fromcol || vcol_prev < fromcol_prev
                                   || vcol >= tocol))
         char_attr = line_attr;
-#endif
       else {
         attr_pri = FALSE;
         if (has_syntax)
@@ -3509,15 +3499,7 @@ win_line (
            * character if the line break is included. */
           /* For a diff line the highlighting continues after the
            * "$". */
-          if (
-            diff_hlf == (hlf_T)0
-#  ifdef LINE_ATTR
-            &&
-#  endif
-# ifdef LINE_ATTR
-            line_attr == 0
-# endif
-            ) {
+          if (diff_hlf == (hlf_T)0 && line_attr == 0) {
             /* In virtualedit, visual selections may extend
              * beyond end of line. */
             if (area_highlighting && virtual_active()
@@ -3570,9 +3552,7 @@ win_line (
                      (col < W_WIDTH(wp)))) {
           c = ' ';
           --ptr;                    /* put it back at the NUL */
-        }
-#if defined(LINE_ATTR)
-        else if ((
+        } else if ((
                    diff_hlf != (hlf_T)0 ||
                    line_attr != 0
                    ) && (
@@ -3596,7 +3576,6 @@ win_line (
               char_attr = hl_attr(diff_hlf);
           }
         }
-#endif
       }
 
       if (   wp->w_p_cole > 0
@@ -3705,11 +3684,7 @@ win_line (
     /*
      * At end of the text line or just after the last character.
      */
-    if (c == NUL
-#if defined(LINE_ATTR)
-        || did_line_attr == 1
-#endif
-        ) {
+    if (c == NUL || did_line_attr == 1) {
       long prevcol = (long)(ptr - line) - (c == NUL);
 
       /* we're not really at that column when skipping some text */
@@ -3740,11 +3715,7 @@ win_line (
                    || lnum == curwin->w_cursor.lnum)
                && c == NUL)
               /* highlight 'hlsearch' match at end of line */
-              || (prevcol_hl_flag == TRUE
-# if defined(LINE_ATTR)
-                  && did_line_attr <= 1
-# endif
-                  )
+              || (prevcol_hl_flag == TRUE && did_line_attr <= 1)
               )) {
         int n = 0;