vim: metarw: Fix not to hook fakepaths with short scheme name

Add 2 rules on the name of a scheme - length and characters.

Fix autocommands not to hook fakepaths with any schene name which consists of
less than 2 characters.  Old definitions incorrectly recognized paths with
a drive letter in Microsoft Windows environment as a fakepath.

doc/metarw.txt

@@ -247,6 +247,9 @@ Scheme						*metarw-scheme*
 	a fakepath.  For example, the scheme of "git:master:src/ui.c" is
 	"git".
 
+	The name of a scheme must consist of 2 or more characters, and it
+	should consist of only lowercase, English alphabets.
+
 Scheme script					*metarw-scheme-script*
 	Support script to enable to read/write fakepathes.  One scheme script
 	supports just one scheme.
@@ -269,6 +272,11 @@ BUGS						*metarw-bugs*
 CHANGELOG					*metarw-changelog*
 
 0.0.x	2008-08-10T12:19:52+09:00
+	- Fix autocommands not to hook fakepaths with any schene name which
+	  consists of less than 2 characters.  Old definitions incorrectly
+	  recognized paths with a drive letter in Microsoft Windows
+	  environment as a fakepath.  (thanks to id:thinca)
+	- Add 2 rules on the name of a scheme (see |metarw-scheme|).
 	- Fix plugin/metarw.vim to be properly reloadable.
 	- Fix requirements - metarw uses |fnameescape()| which is added since
 	  Vim 7.1.299.  (thanks to id:thinca)

plugin/metarw.vim

@@ -31,12 +31,12 @@ endif
 
 augroup plugin-metarw
   autocmd!
-  autocmd BufReadCmd *:{*,*/*}  call metarw#_event_handler('BufReadCmd')
-  autocmd BufWriteCmd *:{*,*/*}  call metarw#_event_handler('BufWriteCmd')
-  autocmd FileAppendCmd *:{*,*/*}  call metarw#_event_handler('FileAppendCmd')
-  autocmd FileReadCmd *:{*,*/*}  call metarw#_event_handler('FileReadCmd')
-  autocmd FileWriteCmd *:{*,*/*}  call metarw#_event_handler('FileWriteCmd')
-  autocmd SourceCmd *:{*,*/*}  call metarw#_event_handler('SourceCmd')
+  autocmd BufReadCmd ??*:{*,*/*}  call metarw#_event_handler('BufReadCmd')
+  autocmd BufWriteCmd ??*:{*,*/*}  call metarw#_event_handler('BufWriteCmd')
+  autocmd FileAppendCmd ??*:{*,*/*}  call metarw#_event_handler('FileAppendCmd')
+  autocmd FileReadCmd ??*:{*,*/*}  call metarw#_event_handler('FileReadCmd')
+  autocmd FileWriteCmd ??*:{*,*/*}  call metarw#_event_handler('FileWriteCmd')
+  autocmd SourceCmd ??*:{*,*/*}  call metarw#_event_handler('SourceCmd')
 augroup END