annotate .swiplrc @ 100:a4cd935561d4 dml-dockerised tip

small updates and version pin for cliopatria

:- op(200,fy,@). % Shouldn't really need this...

colour_terminal :- 
	stream_property(user_output, tty(true)),
	getenv('TERM',Term),
	member(Term,[xterm,screen,'screen-256color','xterm-256color','xterm-color']).

:- dynamic http_proxy/3.

get_http_proxy(Host,Port,basic(User,Pwd)) :-
	getenv(use_proxy,yes),
	getenv(http_proxy,Proxy),
	% proxy looks like http://User:Password@Host:Port
	atom_concat('http://',Proxy1,Proxy), % strip off protocol
	split_atom(Proxy1,Auth,'@',HostPort),
	split_atom(Auth,User,':',Pwd),
	split_atom(HostPort,Host,':',APort),
	atom_number(APort,Port).

split_atom(Atom,Pre,Mid,Post) :-
	sub_atom(Atom,LPre,_,LPost,Mid),
	sub_atom(Atom,0,LPre,_,Pre),
	sub_atom(Atom,_,LPost,0,Post).
	
internal_host(localhost).
internal_host(Proxy) :- http_proxy(Proxy,_,_).
%internal_host(Host) :- sub_atom(Host,_,_,0,'bl.uk').

% New scheme for proxy handling (>=7.3.0)
% :- multifile socket:proxy_for_url/3.
% socket:proxy_for_url(_, Target, proxy(Host,Port)) :-
% 	http_proxy(Host,Port,_),
% 	\+internal_host(Target),
% 	debug(proxy,'Using socketproxy ~w:~w for ~w',[Host,Port,Target]).

% Old scheme, still required to provide authorisation details
:- multifile http:open_options/2.
http:open_options(Parts,[proxy(Host:Port),proxy_authorization(Auth)]) :-
	http_proxy(Host,Port,Auth),
	option(host(Target),Parts),
	\+internal_host(Target),
	debug(proxy,'Using HTTP proxy ~w:~w for ~w',[Host,Port,Target]).

:- (colour_terminal -> load_files(library(ansi_term), [silent(true)]); true),
	set_prolog_flag(prompt_alternatives_on, determinism),
	set_prolog_flag(editor, '$EDITOR'),
	load_files(library(url), [silent(true)]),
	load_files(library(http/http_ssl_plugin), [silent(true)]),
   retractall(http_proxy(_,_,_)),
	(	get_http_proxy(Host,Port,Auth) 
	->	assert(http_proxy(Host,Port,Auth))
	;	true
	).