improve readme, improve std lib

src/util/std.lua

@@ -5,8 +5,7 @@
 -- Table / List
 -- Whether a table contains no keys
 function table.empty(t)
-	for _,_ in pairs(t) do return false end
-	return true
+	return next(t)~=nil
 end
 -- Apply a function to each key in a table
 function table.map(f, ...)
@@ -41,18 +40,6 @@ function table.reverse(l)
 	for i=1,#l do m[#l-i+1] = l[i] end
 	return m
 end
--- Convert i->v to v->true
-function table.values(l)
-	local u = {}
-	for _,v in ipairs(l) do u[v] = true end
-	return u
-end
--- Make a list of keys
-function table.keys(t)
-	local u = {}
-	for k,_ in pairs(t) do table.insert(u, k) end
-	return u
-end
 -- Whether a table is a list/array (has only monotonic integer keys)
 function table.islist(t)
 	local n = 0
@@ -244,8 +231,8 @@ function string.bytes(s)
 end
 -- Trim leading and trailing whitespace
 function string.trim(s, ws)
-	ws = ws or '[ \t\r\t]'
-	return s:gsub('^'..ws..'+', ''):gsub(ws..'+$', '')..''
+	ws = ws or ' \t\r\n'
+	return s:gsub('^['..ws..']+', ''):gsub('['..ws..']+$', '')..''
 end
 -- String slicing and searching using [] operator
 local str_meta = getmetatable('')
@@ -325,7 +312,7 @@ end
 
 io = io or {}
 -- Read entire file at once, return nil,err if access failed
-function io.readfile(filename)
+function io.readall(filename)
 	local fi,err = io.open(filename, 'rb')
 	if not fi then return nil,err end
 	local s = fi:read("*a")
@@ -333,7 +320,7 @@ function io.readfile(filename)
 	return s
 end
 -- Write data to file all at once, return true if success / false,err if failure
-function io.writefile(filename, data)
+function io.writeall(filename, data)
 	local fi,err = io.open(filename, 'wb')
 	if not fi then return false,err end
 	fi:write(data)