Local config: load merged lists of config files

GetConfigFiles function can be used to generate a list of files, merged
from both the main configuration directory and the local configuration
directory. The local configuration directory is also able to suppress
files from the main configuration if necessary.

config-bits/09-local-config.vim

@@ -60,6 +60,30 @@ function! GetConfigFilePath(base,name)
 	return ''
 endfunction
 
+" List files in a configuration directory, letting the local configuration
+" override the main configuration. The files are returned as a dictionary;
+" keys are the files' basenames, while values are the full paths.
+function! GetConfigFiles(base,pattern)
+	let fd = {}
+	" Get main configuration files
+	for mcf in glob( g:vim_home . "/" . a:base . "/" . a:pattern , 1 , 1 )
+		let l:fd[ fnamemodify( l:mcf , ":t" ) ] = l:mcf
+	endfor
+	" Exit if there's no local configuration
+	if !exists( "g:vim_local_path" )
+		return l:fd
+	endif
+	" Handle suppressions
+	for lsf in glob( g:vim_local_path . "/" . a:base . "/suppress." . a:pattern , 1 , 1 )
+		unlet! l:fd[ fnamemodify( l:lsf , ":t" )[ 9 : -1 ] ]
+	endfor
+	" Handle local files
+	for lcf in glob( g:vim_local_path . "/" . a:base . "/" . a:pattern , 1 , 1 )
+		let l:fd[ fnamemodify( l:lcf , ":t" ) ] = l:lcf
+	endfor
+	return l:fd
+endfunction
+
 
 " We need signature handling abilities to continue
 if !exists( "g:vim_keys" )