Add more Vim support files.

misc/vim/README

@@ -9,6 +9,10 @@ into ~/.vim/ or the equivalent path on other platforms (Open Vim and type
 
 The current set of files is as follows:
 
+    ftdetect/factor.vim
+	Teach Vim when to load Factor support files.
+    ftplugin/factor_settings.vim
+	Teach Vim to follow the Factor Coding Style guidelines.
     syntax/factor.vim
         Syntax highlighting for Factor code.
 

misc/vim/ftdetect/factor.vim

@@ -0,0 +1 @@
+autocmd BufRead,BufNewFile *.factor,{,.}factor*-rc set filetype=factor

misc/vim/ftplugin/factor_settings.vim

@@ -0,0 +1,17 @@
+" Code formatting settings loosely adapted from:
+" http://concatenative.org/wiki/view/Factor/Coding%20Style
+
+" Tabs are not allowed in Factor source files; use four spaces instead.
+setlocal expandtab tabstop=4 shiftwidth=4 softtabstop=4
+
+" Try to limit lines to 64 characters, except for documentation, which can be
+" any length.
+if expand("%:t") !~ "-docs\.factor$"
+    setlocal textwidth=64
+
+    " Mark anything in column 64 or beyond as a syntax error.
+    match Error /\%>63v.\+/
+endif
+
+" Teach Vim what comments look like.
+setlocal comments+=b:!,b:#!