[binutils-gdb] Remove fields curch and cur_line from TUI_CMD_WIN

[Patrick Palka <ppalka at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6f1cb6eac2f28c6e1cb49c011f2b916afb90b4ff

commit 6f1cb6eac2f28c6e1cb49c011f2b916afb90b4ff
Author: Patrick Palka <patrick@parcs.ath.cx>
Date:   Tue Aug 18 21:08:57 2015 -0400

    Remove fields curch and cur_line from TUI_CMD_WIN
    
    These fields are currently used to track the location of the cursor
    inside the command window.  But their usefulness is questionable because
    ncurses already internally keeps track of the location of the cursor,
    whose coordinates we can query using the functions getyx(), getcurx() or
    getcury().  It is an unnecessary pain to keep these fields in sync with
    ncurses, and their meaning is not well-defined anyway.  For instance, it
    is not clear whether the coordinates held in these fields are
    authoritative, or whether the coordinates reported by ncurses are.
    
    So to keep things simple, this patch removes these fields and replaces
    existing reads of these fields with calls to the appropriate ncurses
    querying functions, and replaces writes to these fields with calls to
    wmove() (when necessary and applicable).
    
    In the function tui_cont_sig(), I removed the call to wmove() entirely
    because moving to (start_line, curch) makes no sense.  The move should
    have been to (cur_line, curch) -- which would now be a no-op.
    
    Tested on x86_64 Fedora 22, no obvious regressions.
    
    gdb/ChangeLog:
    
    	* tui/tui-data.h (tui_command_info): Remove fields cur_line and
    	curch.
    	* tui/tui-data.c (tui_clear_win_detail) [CMD_WIN]: Don't set
    	cur_line or curch, instead call wmove().
    	(init_win_info) [CMD_WIN]: Likewise.
    	* tui/tui-io.c (tui_puts): Likewise. Don't read cur_line,
    	instead call getcury().
    	(tui_redisplay_readline): Don't set cur_line or curch.
    	(tui_mld_erase_entire_line): Don't read cur_line, instead call
    	getcury().
    	(tui_cont_sig): Remove call to wmove.
    	(tui_getc): Don't read cur_line or curch, instead call getcury()
    	or getyx().  Don't set curch.
    	* tui/tui-win.c (make_visible_with_new_height) [CMD_WIN]: Don't
    	set cur_line or curch.  Always move cursor to (0,0).

Diff:
---
 gdb/ChangeLog      | 18 ++++++++++++++++++
 gdb/tui/tui-data.c |  5 +----
 gdb/tui/tui-data.h |  2 --
 gdb/tui/tui-io.c   | 36 ++++++++++--------------------------
 gdb/tui/tui-win.c  |  6 +-----
 5 files changed, 30 insertions(+), 37 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4496808..9e609ae 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,21 @@
+2015-08-21  Patrick Palka  <patrick@parcs.ath.cx>
+
+	* tui/tui-data.h (tui_command_info): Remove fields cur_line and
+	curch.
+	* tui/tui-data.c (tui_clear_win_detail) [CMD_WIN]: Don't set
+	cur_line or curch, instead call wmove().
+	(init_win_info) [CMD_WIN]: Likewise.
+	* tui/tui-io.c (tui_puts): Likewise. Don't read cur_line,
+	instead call getcury().
+	(tui_redisplay_readline): Don't set cur_line or curch.
+	(tui_mld_erase_entire_line): Don't read cur_line, instead call
+	getcury().
+	(tui_cont_sig): Remove call to wmove.
+	(tui_getc): Don't read cur_line or curch, instead call getcury()
+	or getyx().  Don't set curch.
+	* tui/tui-win.c (make_visible_with_new_height) [CMD_WIN]: Don't
+	set cur_line or curch.  Always move cursor to (0,0).
+
 2015-08-20  Pedro Alves  <palves@redhat.com>
 
 	* infrun.c (print_target_wait_results): Make extern.
diff --git a/gdb/tui/tui-data.c b/gdb/tui/tui-data.c
index 0c350d8..f610d9c 100644
--- a/gdb/tui/tui-data.c
+++ b/gdb/tui/tui-data.c
@@ -212,8 +212,7 @@ tui_clear_win_detail (struct tui_win_info *win_info)
 	  win_info->detail.source_info.horizontal_offset = 0;
 	  break;
 	case CMD_WIN:
-	  win_info->detail.command_info.cur_line =
-	    win_info->detail.command_info.curch = 0;
+	  wmove (win_info->generic.handle, 0, 0);
 	  break;
 	case DATA_WIN:
 	  win_info->detail.data_display_info.data_content =
@@ -546,8 +545,6 @@ init_win_info (struct tui_win_info *win_info)
       win_info->detail.data_display_info.current_group = 0;
       break;
     case CMD_WIN:
-      win_info->detail.command_info.cur_line = 0;
-      win_info->detail.command_info.curch = 0;
       break;
     default:
       win_info->detail.opaque = NULL;
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index 0e7e31e..df1fe6c 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -265,8 +265,6 @@ struct tui_source_info
 
 struct tui_command_info
 {
-  int cur_line;			/* The current line position.  */
-  int curch;			/* The current cursor position.  */
   int start_line;
 };
 
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index 97906ce..f0ff5c0 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -187,10 +187,7 @@ tui_puts (const char *string)
       else if (c == '\n')
         tui_skip_line = -1;
     }
-  getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
-         TUI_CMD_WIN->detail.command_info.curch);
-  TUI_CMD_WIN->detail.command_info.start_line
-    = TUI_CMD_WIN->detail.command_info.cur_line;
+  TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
 }
 
 /* Readline callback.
@@ -271,24 +268,16 @@ tui_redisplay_readline (void)
           waddch (w, c);
 	}
       if (c == '\n')
-        {
-          getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
-                 TUI_CMD_WIN->detail.command_info.curch);
-        }
+	TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
       getyx (w, line, col);
       if (col < prev_col)
         height++;
       prev_col = col;
     }
   wclrtobot (w);
-  getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
-         TUI_CMD_WIN->detail.command_info.curch);
+  TUI_CMD_WIN->detail.command_info.start_line = getcury (w);
   if (c_line >= 0)
-    {
-      wmove (w, c_line, c_pos);
-      TUI_CMD_WIN->detail.command_info.cur_line = c_line;
-      TUI_CMD_WIN->detail.command_info.curch = c_pos;
-    }
+    wmove (w, c_line, c_pos);
   TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
 
   wrefresh (w);
@@ -371,10 +360,11 @@ static void
 tui_mld_erase_entire_line (const struct match_list_displayer *displayer)
 {
   WINDOW *w = TUI_CMD_WIN->generic.handle;
+  int cur_y = getcury (w);
 
-  wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
+  wmove (w, cur_y, 0);
   wclrtoeol (w);
-  wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
+  wmove (w, cur_y, 0);
 }
 
 /* TUI version of displayer.beep.  */
@@ -521,10 +511,6 @@ tui_cont_sig (int sig)
       /* Force a refresh of the screen.  */
       tui_refresh_all_win ();
 
-      /* Update cursor position on the screen.  */
-      wmove (TUI_CMD_WIN->generic.handle,
-             TUI_CMD_WIN->detail.command_info.start_line,
-             TUI_CMD_WIN->detail.command_info.curch);
       wrefresh (TUI_CMD_WIN->generic.handle);
     }
   signal (sig, tui_cont_sig);
@@ -601,7 +587,7 @@ tui_getc (FILE *fp)
          user we recognized the command.  */
       if (rl_end == 0)
         {
-          wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
+	  wmove (w, getcury (w), 0);
 
           /* Clear the line.  This will blink the gdb prompt since
              it will be redrawn at the same line.  */
@@ -614,8 +600,8 @@ tui_getc (FILE *fp)
 	  /* Move cursor to the end of the command line before emitting the
 	     newline.  We need to do so because when ncurses outputs a newline
 	     it truncates any text that appears past the end of the cursor.  */
-	  int px = TUI_CMD_WIN->detail.command_info.curch;
-	  int py = TUI_CMD_WIN->detail.command_info.cur_line;
+	  int px, py;
+	  getyx (w, py, px);
 	  px += rl_end - rl_point;
 	  py += px / TUI_CMD_WIN->generic.width;
 	  px %= TUI_CMD_WIN->generic.width;
@@ -627,8 +613,6 @@ tui_getc (FILE *fp)
   /* Handle prev/next/up/down here.  */
   ch = tui_dispatch_ctrl_char (ch);
   
-  if (ch == '\n' || ch == '\r' || ch == '\f')
-    TUI_CMD_WIN->detail.command_info.curch = 0;
   if (ch == KEY_BACKSPACE)
     return '\b';
 
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index 29ad279..6768d35 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -1525,8 +1525,6 @@ make_visible_with_new_height (struct tui_win_info *win_info)
       tui_display_all_data ();
       break;
     case CMD_WIN:
-      win_info->detail.command_info.cur_line = 0;
-      win_info->detail.command_info.curch = 0;
 #ifdef HAVE_WRESIZE
       wresize (TUI_CMD_WIN->generic.handle,
 	       TUI_CMD_WIN->generic.height,
@@ -1535,9 +1533,7 @@ make_visible_with_new_height (struct tui_win_info *win_info)
       mvwin (TUI_CMD_WIN->generic.handle,
 	     TUI_CMD_WIN->generic.origin.y,
 	     TUI_CMD_WIN->generic.origin.x);
-      wmove (win_info->generic.handle,
-	     win_info->detail.command_info.cur_line,
-	     win_info->detail.command_info.curch);
+      wmove (win_info->generic.handle, 0, 0);
       break;
     default:
       break;