allow system option short form NAME for NAME=true for type string, not just bool;
support short system options "-o document" and "-o system_log";
(* Title: Pure/Sessions.thy
Author: Makarius
PIDE markup for session ROOT.
*)
theory Sessions
imports Pure
keywords "session" :: thy_decl
and "description" "directories" "options" "sessions" "theories"
"document_theories" "document_files" "export_files" :: quasi_command
and "global"
begin
ML \<open>
Outer_Syntax.command \<^command_keyword>\<open>session\<close> "PIDE markup for session ROOT"
Sessions.command_parser;
\<close>
end