forked from massemanet/distel
/
otp_doc.erl
350 lines (294 loc) · 9.9 KB
/
otp_doc.erl
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%% -*- erlang-indent-level: 2 -*-
%%% Created : 6 Mar 2008 by Mats Cronqvist <masse@kreditor.se>
%% @doc
%% @end
-module('otp_doc').
-author('Mats Cronqvist').
-define(is_str(S),(S==[] orelse is_integer(hd(S)))).
%% --------------------------------------------------------------------------
%% gen_server boilerplate
-behaviour(gen_server).
-export([handle_call/3, handle_cast/2, handle_info/2,
init/1, terminate/2, code_change/3]).
%% --------------------------------------------------------------------------
% API - these run in the shell
-export([start/0,start/1,stop/0]).
-export([distel/4,modules/1,functions/2,arguments/2]).
-export([firefox/1,firefox/2,firefox/3]).
-export([sig/1,sig/2,sig/3]).
-export([funcsf/3]).
stop() ->
case whereis(?MODULE) of
undefined -> ok;
_ -> gen_server:call(?MODULE,stop)
end.
start() -> start([]).
start(Props) -> assert(Props).
distel(link,M,F,A) when ?is_str(M),?is_str(F),is_integer(A) ->
get(link,M,F,A);
distel(sig,M,F,A) when ?is_str(M),?is_str(F),is_integer(A) ->
case get(sig,M,F,A) of
[] -> [];
no_html -> no_html;
Sigs -> {sig, str_join(Sigs,"\n")}
end;
distel(A,B,C,D) ->
erlang:display({A,B,C,D}),
[].
sig(M) -> sig(M,'').
sig(M,F) -> sig(M,F,-1).
sig(M,F,A) when is_atom(M), is_atom(F), is_integer(A) -> get(sig,M,F,A).
firefox(M) -> firefox(M,'').
firefox(M,F) -> firefox(M,F,-1).
firefox(M,F,A) when is_atom(M), is_atom(F), is_integer(A) ->
case get(link,M,F,A) of
no_html -> no_doc_installed;
Link -> ffx(Link)
end.
ffx({link,Link}) -> os:cmd("firefox "++Link),Link;
ffx({mfas,MFAs}) -> MFAs;
ffx([]) -> no_doc.
modules(Prefix) -> completions(mods,Prefix,"").
functions(Mod,Prefix) -> completions(funcs,Mod,Prefix).
arguments(_Mod,_Fun) -> {ok,""}.
completions(What,M,F) ->
case get(What,M,F,"") of
no_html -> {error,no_html};
[] -> {error,not_found};
Ans -> {ok,Ans}
end.
get(W,M,F,A) when is_atom(W) ->
assert([]),
gen_server:call(?MODULE,{W,to_list(M),to_list(F),to_list(A)}).
assert(Props) ->
case whereis(?MODULE) of
undefined -> gen_server:start({local,?MODULE},?MODULE,Props,[]);
Pid -> {ok,Pid}
end.
%% --------------------------------------------------------------------------
%% implementation - runs in the server
-record(state,{root_dir,prot=file,delim=delim()}).
%% gen_server callbacks
init(Props) ->
%% Dir = "/usr/share/doc/erlang-15.2/html",
Dir = proplists:get_value(root_dir, Props, code:root_dir()),
Prot = proplists:get_value(prot, Props, file),
ets:new(?MODULE,[named_table,ordered_set]),
try html_index(Prot,Dir),
{ok,#state{root_dir=Dir,prot=Prot}}
catch _:_ ->
{ok,no_html}
end.
terminate(_,_) -> ok.
code_change(_,State,_) -> {ok,State}.
handle_cast(_In,State) -> {noreply,State}.
handle_info(_In,State) -> {noreply,State}.
handle_call(stop,_From,State) ->
{stop,normal,ok,State};
handle_call(_In,_From,no_html) ->
{reply,no_html,no_html};
handle_call({sig,M,F,A},_From,State) ->
{reply,handle_sig(M,F,A,State),State};
handle_call({mods,M,_,_},_From,State) ->
{reply,handle_mods(M,State),State};
handle_call({funcs,M,F,_},_From,State) ->
{reply,handle_funcs(M,F,State),State};
handle_call({link,M,F,A},_From,State) ->
{reply,handle_link(M,F,A,State),State}.
%% --------------------------------------------------------------------------
handle_sig(Mo,Fu,Aa,_State) ->
try [get_sig(M,F,A) || {M,F,A} <- matching_mfas(Mo, Fu, Aa)]
catch _:_ -> []
end.
handle_mods(Prefix,_State) ->
try all_prefix_keys({file,Prefix})
catch _:_ -> []
end.
handle_funcs(Mod,Prefix,_State) ->
try [F || {_,F} <- all_fs(Mod,Prefix)]
catch _:_ -> []
end.
handle_link(Mo,Fu,Aa,State) ->
try MFAs = matching_mfas(Mo, Fu, Aa),
until([fun()->link_with_anchor(MFAs,State) end,
fun()->exact_match(Mo,Fu,MFAs,State) end,
fun()->link_without_anchor(MFAs,State) end,
fun()->mfa_multi(MFAs,State) end])
catch _:_ -> []
end.
until([F|Fs]) ->
try F()
catch _:_ -> until(Fs)
end.
link_with_anchor(MFAs,State) ->
[_] = lists:usort([{M,F}||{M,F,_A}<-MFAs]),
{A,{M,F}} = lists:min([{A,{M,F}}||{M,F,A}<-MFAs]),
{link,io_str("~w://~s#~s~s~s",
[State#state.prot,e_get({file,M}),linkmf(M,F),State#state.delim,A])}.
linkmf("erlang",F) -> "erlang:"++F;
linkmf(_,F) -> F.
exact_match(M,F,MFAs,State) ->
A = lists:min([A||{Mo,Fu,A}<-MFAs,M==Mo,F==Fu]),
{link,io_str("~w://~s#~s~s~s",
[State#state.prot,e_get({file,M}),linkmf(M,F),State#state.delim,A])}.
link_without_anchor(MFAs,State) ->
[M] = lists:usort([M || {M,_F,_A} <- MFAs]),
{link,io_str("~w://~s",[State#state.prot, e_get({file,M})])}.
mfa_multi(MFAs,_State) ->
{mfas,str_join([io_str("~s:~s/~s",[M,F,A])||{M,F,A}<-MFAs],", ")}.
get_sig(M,F,A) ->
Sig = e_get({{sig,M,F},A}),
io_str("~s:~s",[M,Sig]).
matching_mfas(Mo, Fu, Aa) ->
MFs = lists:append([all_fs(M,Fu) || M <- matching_ms(Mo)]),
lists:append([[{M,F,A} || A <- which_a(M,F,Aa)] || {M,F} <- MFs]).
matching_ms(M) ->
Ms = all_prefix_keys({file,M}),
case lists:member(M,Ms) of
true -> [M];
false-> Ms
end.
all_fs(Mo,Fu) ->
maybe_cache(Mo),
[{Mo,F} || F <- all_prefix_keys({{as,Mo},Fu})].
all_prefix_keys({Tag,X}) ->
case ets:member(?MODULE,{Tag,X}) of
true -> [X|all_prefix_keys({Tag,X},ets:next(?MODULE,{Tag,X}))];
false-> all_prefix_keys({Tag,X},ets:next(?MODULE,{Tag,X}))
end.
all_prefix_keys({Tag,X0},{Tag,X}) ->
case lists:prefix(X0,X) of
true -> [X|all_prefix_keys({Tag,X0},ets:next(?MODULE,{Tag,X}))];
false-> []
end;
all_prefix_keys(_,_) ->
[].
which_a(M,F,"-1") ->
e_get({{as,M},F});
which_a(M,F,A) ->
case lists:member(A,e_get({{as,M},F})) of
true -> [A];
false-> []
end.
%% --------------------------------------------------------------------------
%% read the index file
%% store name of html file in {Mod,file}
html_index(file,Dir) ->
FN = filename:join([Dir,"doc","man_index.html"]),
fold_file(curry(fun lines/3,Dir),[],FN).
lines(Line,_,Dir) ->
case string:tokens(Line, "<> \"") of
["TD", "A", "HREF=", "../"++Href, M|_] ->
case filename:basename(Href,".html") of
"index" -> ok;
"erlang"->
%%treat erlang module special,because there are two links
%% HREF="../erts-5.9/doc/html/erlang.html" this is the real one
%% HREF="../lib/kernel-2.15/doc/html/erlang.html" there is nothing here
case ets:lookup(otp_doc,{file,"erlang"}) of
[]->
e_set({file,M}, filename:join([Dir,Href]));
[{{file,"erlang"}, ErlangPath}]->
e_set({file,M}, ErlangPath)
end;
M -> e_set({file,M}, filename:join([Dir,Href]))
end;
_ -> ok
end.
%% --------------------------------------------------------------------------
%% read a module's html file
%% store the function names in {fs,Mod}, the arities in {{as,M},F} and the
%% function signature in {{sig,M,F},A}
maybe_cache(M) ->
try e_get({fs,M})
catch
no_data -> cache_funcs(M)
end.
cache_funcs(M) ->
e_set({fs,M},[]),
fold_file(curry(fun funcsf/3,M), [], e_get({file,M})).
funcsf(Line,A,M) ->
case trim_P(string:tokens(A++Line,"<>\"")) of
["a name=",FA,"/a","span class=","bold_code",Sig,"/span"|_] -> % R14
a_line(M,fa(FA),Sig),[]; % R12-
["a name=",FA,"span class=","bold_code",Sig,"/span","/a"|_] ->
a_line(M,fa(FA),Sig),[]; % R12-
["A NAME=",FA,"STRONG","CODE",Sig,"/CODE","/STRONG","/A"|_] ->
a_line(M,fa(FA),Sig),[]; % -R11
["A NAME=",_,"STRONG","CODE"|_] ->
A++Line; % -R11, broken lines
_ ->
case A of
[] -> [];
_ -> A++Line
end
end.
a_line(_,["Module:"++_,_],_) -> ok; %ignore the gen_server/gen_fsm callbacks
a_line("erlang",["erlang:"++F,A],"erlang:"++Sig) -> a_line("erlang",[F,A],Sig);
a_line(M,[F,A],Sig) -> %io:fwrite("- ~p~n",[{M,F,A}]).
try e_bag({fs,M},F),
e_bag({{as,M},F}, A),
e_set({{sig,M,F},A}, dehtml(Sig))
catch _:_ -> ok
end.
fa(FA) -> string:tokens(FA,delim()).
trim_P([_,"P"|L]) -> L;
trim_P([_,"p"|L]) -> L;
trim_P(["P"|L]) -> L;
trim_P(["p"|L]) -> L;
trim_P(L) -> L.
delim() ->
try erlang:system_info(otp_release), "-"
catch _:_ -> "/"
end.
%% --------------------------------------------------------------------------
%% ets-based dictionary
e_set(Key,Val) -> ets:insert(?MODULE,{Key,Val}).
e_get(Key) ->
case ets:lookup(?MODULE,Key) of
[{Key,Val}] -> Val;
[] -> throw(no_data);
X -> exit({bad_e_get,{table,?MODULE},{key,Key},{value,X}})
end.
e_bag(Key,Val) ->
try e_get(Key) of
L when is_list(L) -> e_set(Key,[Val|L]);
X -> exit({bad_e_bag,{table,?MODULE},{key,Key},{value,X}})
catch
no_data -> e_set(Key,[Val])
end.
%% --------------------------------------------------------------------------
%% the missing fold_file/3 function
fold_file(Fun,Acc0,File) ->
{ok, FD} = file:open(File, [read]),
Acc = fold_file_lines(FD,Fun,Acc0),
file:close(FD),
Acc.
fold_file_lines(FD,Fun,Acc) ->
case io:get_line(FD, "") of
eof -> Acc;
Line -> fold_file_lines(FD,Fun,Fun(trim_nl(Line),Acc))
end.
trim_nl(Str) -> lists:reverse(tl(lists:reverse(Str))).
%% --------------------------------------------------------------------------
%% Schönfinkelisation
curry(F,Arg) ->
case erlang:fun_info(F,arity) of
%% {_,1} -> fun() -> F(Arg) end;
%% {_,2} -> fun(A) -> F(A,Arg) end;
{_,3} -> fun(A,B) -> F(A,B,Arg) end
%% {_,4} -> fun(A,B,C) -> F(A,B,C,Arg) end
end.
%% --------------------------------------------------------------------------
io_str(F,A) -> lists:flatten(io_lib:format(F,A)).
%% dehtmlize right angle
dehtml(">"++Str) -> ">"++dehtml(Str);
dehtml(">"++Str) -> ">"++dehtml(Str);
dehtml([H|Str]) -> [H|dehtml(Str)];
dehtml("") -> "".
str_join([], _Sep) -> "";
str_join([Pref|Toks], Sep) ->
lists:foldl(fun(Tok,O) -> O++Sep++Tok end, Pref, Toks).
to_list(A) when is_atom(A) -> atom_to_list(A);
to_list(I) when is_integer(I)-> integer_to_list(I);
to_list(S) when ?is_str(S) -> S.