When cpoptions+=$, '$' is not shown at column 1.

vim -u NONE
:set cpoptions+=$
afoo<ESC>0cl

Expected: $oo
But: oo

The variable dollar_vcol stored virtual column to display '$'. And it don't 
work when 0.
This is intended behavior to undisplay '$'. But the zero is possible value 
for column.

Below is a patch. This patch change the special value '0' to '-1'.

Please check and include.
This patch is written by Hideki EIRAKU and Hirohito Higashi.

https://gist.github.com/1694734
(https://raw.github.com/gist/1694734/gistfile1.diff)

diff -r 54d621a3b561 src/edit.c
--- a/src/edit.c Thu Jan 26 20:58:26 2012 +0100
+++ b/src/edit.c Sun Jan 29 00:34:53 2012 +0900
@@ -1763,9 +1763,9 @@
     static void
 undisplay_dollar()
 {
-    if (dollar_vcol)
-    {
- dollar_vcol = 0;
+    if (dollar_vcol >= 0)
+    {
+ dollar_vcol = -1;
  redrawWinline(curwin->w_cursor.lnum, FALSE);
     }
 }
@@ -5441,7 +5441,7 @@
  compl_curr_match->cp_number);
  edit_submode_extra = match_ref;
  edit_submode_highl = HLF_R;
- if (dollar_vcol)
+ if (dollar_vcol >= 0)
     curs_columns(FALSE);
     }
  }
@@ -8961,7 +8961,7 @@
      * We can emulate the vi behaviour by pretending there is a dollar
      * displayed even when there isn't.
      *  --pkv Sun Jan 19 01:56:40 EST 2003 */
-    if (vim_strchr(p_cpo, CPO_BACKSPACE) != NULL && dollar_vcol == 0)
+    if (vim_strchr(p_cpo, CPO_BACKSPACE) != NULL && dollar_vcol < 0)
  dollar_vcol = curwin->w_virtcol;
 
 #ifdef FEAT_FOLDING
diff -r 54d621a3b561 src/globals.h
--- a/src/globals.h Thu Jan 26 20:58:26 2012 +0100
+++ b/src/globals.h Sun Jan 29 00:34:53 2012 +0900
@@ -115,7 +115,7 @@
  * is put at the end of the changed text. dollar_vcol is set to the virtual
  * column of this '$'.
  */
-EXTERN colnr_T dollar_vcol INIT(= 0);
+EXTERN colnr_T dollar_vcol INIT(= -1);
 
 #ifdef FEAT_INS_EXPAND
 /*
diff -r 54d621a3b561 src/move.c
--- a/src/move.c Thu Jan 26 20:58:26 2012 +0100
+++ b/src/move.c Sun Jan 29 00:34:53 2012 +0900
@@ -362,7 +362,7 @@
 #endif
     )
     {
- dollar_vcol = 0;
+ dollar_vcol = -1;
  if (curwin->w_skipcol != 0)
  {
     curwin->w_skipcol = 0;
@@ -966,7 +966,7 @@
 
     /* remove '$' from change command when cursor moves onto it */
     if (startcol > dollar_vcol)
- dollar_vcol = 0;
+ dollar_vcol = -1;
 
     extra = curwin_col_off();
     curwin->w_wcol = curwin->w_virtcol + extra;
diff -r 54d621a3b561 src/screen.c
--- a/src/screen.c Thu Jan 26 20:58:26 2012 +0100
+++ b/src/screen.c Sun Jan 29 00:34:53 2012 +0900
@@ -1637,11 +1637,12 @@
      * When at start of changed lines: May scroll following lines
      * up or down to minimize redrawing.
      * Don't do this when the change continues until the end.
-     * Don't scroll when dollar_vcol is non-zero, keep the "$".
+     * Don't scroll when dollar_vcol is greater than equal zero,
+     * keep the "$".
      */
     if (lnum == mod_top
     && mod_bot != MAXLNUM
-    && !(dollar_vcol != 0 && mod_bot == mod_top + 1))
+    && !(dollar_vcol >= 0 && mod_bot == mod_top + 1))
     {
  int old_rows = 0;
  int new_rows = 0;
@@ -1868,12 +1869,12 @@
     if (row > wp->w_height) /* past end of screen */
     {
  /* we may need the size of that too long line later on */
- if (dollar_vcol == 0)
+ if (dollar_vcol < 0)
     wp->w_lines[idx].wl_size = plines_win(wp, lnum, TRUE);
  ++idx;
  break;
     }
-    if (dollar_vcol == 0)
+    if (dollar_vcol < 0)
  wp->w_lines[idx].wl_size = row - srow;
     ++idx;
 #ifdef FEAT_FOLDING
@@ -1990,7 +1991,7 @@
     }
 #endif
  }
- else if (dollar_vcol == 0)
+ else if (dollar_vcol < 0)
     wp->w_botline = lnum;
 
  /* make sure the rest of the screen is blank */
@@ -2005,7 +2006,7 @@
     wp->w_old_botfill = wp->w_botfill;
 #endif
 
-    if (dollar_vcol == 0)
+    if (dollar_vcol < 0)
     {
  /*
  * There is a trick with w_botline.  If we invalidate it on each
@@ -3564,7 +3565,7 @@
  }
 
  /* When still displaying '$' of change command, stop at cursor */
- if (dollar_vcol != 0 && wp == curwin
+ if (dollar_vcol >= 0 && wp == curwin
    && lnum == wp->w_cursor.lnum && vcol >= (long)wp->w_virtcol
 #ifdef FEAT_DIFF
    && filler_todo <= 0
diff -r 54d621a3b561 src/search.c
--- a/src/search.c Thu Jan 26 20:58:26 2012 +0100
+++ b/src/search.c Sun Jan 29 00:34:53 2012 +0900
@@ -2501,8 +2501,8 @@
     save_siso = p_siso;
     /* Handle "$" in 'cpo': If the ')' is typed on top of the "$",
      * stop displaying the "$". */
-    if (dollar_vcol > 0 && dollar_vcol == curwin->w_virtcol)
- dollar_vcol = 0;
+    if (dollar_vcol >= 0 && dollar_vcol == curwin->w_virtcol)
+ dollar_vcol = -1;
     ++curwin->w_virtcol; /* do display ')' just before "$" */
     update_screen(VALID); /* show the new char first */
--

Yasuhiro Matsumoto

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