Vim 5 compatibility

Vim 5 doesn't recognise the <SID> prefix for functions or the += syntax
for variable assignment.  It also doesn't recognise variables in the
global scope without an explicit g: prefix.
Rewrite Startup_Resize() and Resize_Columns() with the above in mind.

diff --git a/.vimrc b/.vimrc
index c3eee65..9f8f25a 100644 (file)
--- a/.vimrc
+++ b/.vimrc
@@ -109,8 +109,8 @@ autocmd!
 augroup END
 
 " Save the current window width so we can restore it when we quit.
-if ! exists("oldcols")
-  let oldcols=&columns
+if ! exists("g:oldcols")
+  let g:oldcols=&columns
 endif
 
 " More GUI options.  Add icon, tearoffs and toolbar.
@@ -254,7 +254,8 @@ fun! Resize_Columns(op, ...)
     let l:columns = a:1
   endif
 
-  let l:resize = "se columns" . a:op . "=" . l:columns
+  exe "let l:resize=" . &columns . a:op . l:columns
+  let l:resize = "se columns=" . l:resize
 
   " HACK: Inside screen there is an extra line for the status bar.  Vim
   " manages the resize by sending an escape sequence to set the number of
@@ -264,10 +265,10 @@ fun! Resize_Columns(op, ...)
   " the real terminal being shrunk by a line.  We ask for the terminal to grow
   " by a line so it ends up actually being the same.
   if &term =~ '^screen'
-    let l:resize .= " lines+=1"
+    let l:resize = l:resize . " lines=" . (&lines + 1)
   endif
 
-  exec l:resize
+  exe l:resize
 endfun
 
 " Toggle number display.
@@ -300,7 +301,7 @@ fun! Number(resize)
 endfun
 
 " Restore window size.
-au Display VimLeave * if exists("oldcols") | call Resize_Columns("-", (&columns - oldcols)) | endif
+au Display VimLeave * if exists("g:oldcols") | call Resize_Columns("-", (&columns - g:oldcols)) | endif
 
 " Map Makefile mode.
 au Mode BufEnter * if &ft == "make" | call MakeMode_map() | endif
@@ -366,29 +367,37 @@ map Q <NOP>
 " Vim tip 99: What's the highlighting group under the cursor?
 call Mapping("h", ":echo \"hi<\" . synIDattr(synID(line(\".\"),col(\".\"),1),\"name\") . '> trans<' . synIDattr(synID(line(\".\"),col(\".\"),0),\"name\") . \"> lo<\" . synIDattr(synIDtrans(synID(line(\".\"),col(\".\"),1)),\"name\") . \">\"<CR>")
 
-fun! <SID>Startup_Resize()
+fun! Startup_Resize()
+  let l:columns = 0
+
   " Resize for numbers.
-  if version >= "700"
-    let l:columns = &numberwidth
-  else
-    let l:columns = 8
+  if &number
+    if version >= "700"
+      let l:columns = &numberwidth
+    else
+      let l:columns = 8
+    endif
   endif
 
   " Resize for signs.
   if has("signs")
-    if version >= "600"
-      let l:columns += 2
+    if g:marksigns
+      if version >= "600"
+        let l:columns = l:columns + 2
+      endif
     endif
   endif
 
-  call Resize_Columns("+", l:columns)
+  if g:oldcols < (80 + l:columns)
+    call Resize_Columns("+", l:columns)
+  endif
 endfun
 
 " Show numbers by default.
 au Display VimEnter * call Number(0)
 
 " Resize after startup.
-au Display VimEnter * call <SID>Startup_Resize()
+au Display VimEnter * call Startup_Resize()
 endif
 
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