Cursor binding.

Show scrollbind or cursorbind in the statusline.

If cursorbind (introduced in Vim 7.3) is on show a horizontal arrow
indicator.
If scrollbind is on (and cursorbind isn't) show a vertical indicator.

This necessitates moving Has_Unicode() to the Vim 5 section and hence
removing the script prefix.

Set cursorbind automatically where supported if diff mode is on.

diff --git a/.vimrc b/.vimrc
index d28d4e5..03862f6 100644 (file)
--- a/.vimrc
+++ b/.vimrc
@@ -614,6 +614,27 @@ endif "}}}1
 if version >= "504" "{{{1
 version 5.4
 
+" Do we have Unicode?
+fun! Has_Unicode() "{{{2
+  if ! has('multi_byte')
+    return 0
+  endif
+
+  if version < "602"
+    return 0
+  endif
+
+  if &tenc =~? '^u\(tf\|cs\)'
+    return 1
+  endif
+
+  if ! strlen(&tenc) && &enc =~? '^u\(tf\|cs\)'
+    return 1
+  endif
+
+  return 0
+endfun "}}}2
+
 " Helper for status line.
 " Show space, underscore or dollar sign depending on list mode.
 fun! Show_List() "{{{2
@@ -621,7 +642,7 @@ fun! Show_List() "{{{2
   if w:iainlist == 0
     " No list.
     return " "
-  elseif <SID>Has_Unicode()
+  elseif Has_Unicode()
     if w:iainlist == 1
       " Just tabs.
       return "»"
@@ -709,13 +730,34 @@ fun! Show_Alt() "{{{2
   return " " . l:alt . ": " . expand("#:t")
 endfun "}}}2
 
+" Helper for status line.
+" Show scrollbind or cursorbind.
+fun! Show_Bind() "{{{2
+  if has("cursorbind")
+    if &cursorbind
+      if Has_Unicode()
+        return "⇄"
+      else
+        return ">"
+      endif
+    elseif &scrollbind
+      if Has_Unicode()
+        return "⇅"
+      else
+        return "^"
+      endif
+    endif
+  endif
+  return ""
+endfun "}}}2
+
 " Show the status line.
 fun! Show_StatusLine() "{{{2
   if ! has("statusline")
     return
   endif
   call Iain_Vars()
-  let l:sl1='%2n\:\ %<%1*%f%0*\ [%{Show_List()}%{Show_Case()}%{Show_Tabstop()}%{Show_Paste()}%{Show_VirtualEdit()}%{Show_Undo()}%Y%M%R]%{Show_Alt()}\ '
+  let l:sl1='%2n\:\ %<%1*%f%0*\ [%{Show_List()}%{Show_Bind()}%{Show_Case()}%{Show_Tabstop()}%{Show_Paste()}%{Show_VirtualEdit()}%{Show_Undo()}%Y%M%R]%{Show_Alt()}\ '
   let l:sl3='L:%1*%4.6l%0*/%-4.6L\ C:%1*%3.6c%0*\ \|\ %P'
   let l:hexformat='%b'
   if b:iainhex
@@ -864,7 +906,7 @@ fun! <SID>Cycle_Signs(resize) "{{{2
     " Signs with Type '-' will be highlighted with the MarkLine group.
     " Signs with Type '.' will be highlighted with the MarkDot group.
     " Define the Mark where Symbol is not also the mark name, eg "']".
-    if <SID>Has_Unicode()
+    if Has_Unicode()
       let g:iainsigns = "Dash:'=’ Dot:..• Quote:\"=” Caret:^.ʌ"
     else
       let g:iainsigns = "Dash=' Dot:..* Quote=\" Caret.^"
@@ -917,31 +959,10 @@ fun! <SID>Cycle_Signs(resize) "{{{2
   endif
 endfun "}}}2
 
-" Do we have Unicode?
-fun! <SID>Has_Unicode() "{{{2
-  if ! has('multi_byte')
-    return 0
-  endif
-
-  if version < "602"
-    return 0
-  endif
-
-  if &tenc =~? '^u\(tf\|cs\)'
-    return 1
-  endif
-
-  if ! strlen(&tenc) && &enc =~? '^u\(tf\|cs\)'
-    return 1
-  endif
-
-  return 0
-endfun "}}}2
-
 " Change list mode.
 fun! Cycle_List() "{{{2
   " Pretty UTF-8 listchars.
-  if <SID>Has_Unicode()
+  if Has_Unicode()
     let basic='tab:»·,trail:…,extends:«,precedes:»'
     let eol='eol:¶'
     if version >= "700"
@@ -1301,6 +1322,10 @@ if has("autocmd")
   if has("persistent_undo")
     au File BufReadPost * call <SID>Check_Undo()
   endif
+
+  if has("cursorbind")
+    au Display WinEnter * if &diff | se cursorbind | endif
+  endif
 endif
 endif "}}}1