remove preferred apps/alternates - same can be accomplished using aliases

sys/modules/opus/alternate.lua

@@ -1,48 +0,0 @@
-local Array  = require('opus.array')
-local Config = require('opus.config')
-local Util   = require('opus.util')
-
-local function getConfig()
-	return Config.load('alternate', {
-		shell = {
-			'sys/apps/shell.lua',
-			'rom/programs/shell.lua',
-		},
-		lua = {
-			'sys/apps/Lua.lua',
-			'rom/programs/lua.lua',
-		},
-		files = {
-			'sys/apps/Files.lua',
-		}
-	})
-end
-
-local Alt = { }
-
-function Alt.get(key)
-	return getConfig()[key][1]
-end
-
-function Alt.set(key, value)
-	local config = getConfig()
-	Array.removeByValue(config[key], value)
-	table.insert(config[key], 1, value)
-	Config.update('alternate', config)
-end
-
-function Alt.remove(key, value)
-	local config = getConfig()
-	Array.removeByValue(config[key], value)
-	Config.update('alternate', config)
-end
-
-function Alt.add(key, value)
-	local config = getConfig()
-	if not Util.contains(config[key], value) then
-		table.insert(config[key], value)
-		Config.update('alternate', config)
-	end
-end
-
-return Alt

sys/modules/opus/fs/ramfs.lua

@@ -79,10 +79,40 @@ function ramfs.list(node, dir)
 end
 
 function ramfs.open(node, fn, fl)
-	if fl ~= 'r' and fl ~= 'w' and fl ~= 'rb' and fl ~= 'wb' then
+	local modes = Util.transpose { 'r', 'w', 'rb', 'wb', 'a' }
+	if not modes[fl] then
 		error('Unsupported mode')
 	end
 
+	if fl == 'a' then
+		if node.mountPoint ~= fn then
+			fl = 'w'
+		else
+			local c = type(node.contents) == 'table'
+				and string.char(table.unpack(node.contents))
+				or node.contents
+				or ''
+
+			return {
+				write = function(str)
+					c = c .. str
+				end,
+				writeLine = function(str)
+					c = c .. str .. '\n'
+				end,
+				flush = function()
+					node.contents = c
+					node.size = #c
+				end,
+				close = function()
+					node.contents = c
+					node.size = #c
+					c = nil
+				end,
+			}
+		end
+	end
+
 	if fl == 'r' then
 		if node.mountPoint ~= fn then
 			return