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#!/usr/bin/env escript
%% -*- erlang -*-
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2011-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%% <script> [-I<dir>]... [-o<dir>] [-module Module] [File]
%%%
%%% Use EDoc and the layout module 'docgen_otp_specs' to create an XML file
%%% containing Dialyzer types and specifications (-type, -spec).
%%%
%%% Options:
%%%
%%% "-o<dir>" The output directory for the created file.
%%% Default is ".".
%%% "-I<dir>" Directory to be searched when including a file.
%%% "-module Module"
%%% Module name to use when there is no File argument.
%%% A empty specifications file will be created.
%%% Exactly one of -module Module and File must be given.
%%%
%%% The name of the generated file is "specs_<module>.xml". Its exact
%%% format is not further described here.
main(Args) ->
case catch parse(Args, [], ".", no_module) of
{ok, FileSpec, InclFs, Dir} ->
call_edoc(FileSpec, InclFs, Dir);
{error, Msg} ->
io:format("~s\n", [Msg]),
usage()
end.
parse(["-o"++Dir | Opts], InclFs, _, Module) ->
parse(Opts, InclFs, Dir, Module);
parse(["-I"++I | Opts], InclFs, Dir, Module) ->
parse(Opts, [I | InclFs], Dir, Module);
parse(["-module", Module | Opts], InclFs, Dir, _) ->
parse(Opts, InclFs, Dir, Module);
parse([File], InclFs, Dir, no_module) ->
{ok, {file, File}, lists:reverse(InclFs), Dir};
parse([_], _, _, _) ->
{error, io_lib:format("Cannot have both -module option and file", [])};
parse([], _, _, no_module) ->
{error, io_lib:format("Missing -module option or file", [])};
parse([], InclFs, Dir, Module) ->
{ok, {module, Module}, lists:reverse(InclFs), Dir};
parse(Args, _, _, _) ->
{error, io_lib:format("Bad arguments: ~p", [Args])}.
usage() ->
io:format("usage: ~s [-I<include_dir>]... [-o<out_dir>] "
"[-module <module>] [file]\n", [escript:script_name()]),
halt(1).
call_edoc(FileSpec, InclFs, Dir) ->
ReadOpts = [{includes, InclFs}, {preprocess, true}],
ExtractOpts = [{report_missing_type, false}],
LayoutOpts = [{pretty_printer, erl_pp}, {layout, docgen_otp_specs}],
File = case FileSpec of
{file, File0} -> File0;
{module, Module0} -> Module0
end,
try
Fs = case FileSpec of
{file, _} ->
Fs0 = read_file(File, ReadOpts),
clauses(Fs0);
{module, Module} ->
[{attribute,0,module,list_to_atom(Module)}]
end,
Doc = extract(File, Fs, ExtractOpts),
Text = edoc:layout(Doc, LayoutOpts),
ok = write_text(Text, File, Dir),
rename(Dir, File)
catch
_:_ ->
io:format("EDoc could not process file '~s'\n", [File]),
clean_up(Dir),
halt(3)
end.
read_file(File, Opts) ->
edoc:read_source(File, Opts).
extract(File, Forms, Opts) ->
Env = edoc_lib:get_doc_env([], [], _Opts=[]),
{_Module, Doc} = edoc_extract:source(Forms, File, Env, Opts),
Doc.
clauses(Fs) ->
clauses(Fs, no).
clauses([], no) ->
[];
clauses([F | Fs], Spec) ->
case F of
{attribute,_,spec,_} ->
clauses(Fs, F);
{function,_,_N,_A,_Cls} when Spec =/= no->
{attribute,_,spec,{Name,FunTypes}} = Spec,
%% [throw({no,Name,{_N,_A}}) || Name =/= {_N,_A}],
%% EDoc doesn't care if a function appears more than once;
%% this is how overloaded specs are handled:
(lists:append([[setelement(4, Spec, {Name,[T]}),F] ||
T <- FunTypes])
++ clauses(Fs, no));
_ ->
[F | clauses(Fs, Spec)]
end.
write_text(Text, File, Dir) ->
Base = filename:basename(File, ".erl"),
OutFile = filename:join(Dir, Base) ++ ".specs",
case file:write_file(OutFile, Text) of
ok ->
ok;
{error, R} ->
R1 = file:format_error(R),
io:format("could not write file '~s': ~s\n", [File, R1]),
halt(2)
end.
rename(Dir, F) ->
Mod = filename:basename(F, ".erl"),
Old = filename:join(Dir, Mod ++ ".specs"),
New = filename:join(Dir, "specs_" ++ Mod ++ ".xml"),
case file:rename(Old, New) of
ok ->
ok;
{error, R} ->
R1 = file:format_error(R),
io:format("could not rename file '~s': ~s\n", [New, R1]),
halt(2)
end.
clean_up(Dir) ->
_ = [file:delete(filename:join(Dir, F)) ||
F <- ["packages-frame.html",
"overview-summary.html",
"modules-frame.html",
"index.html", "erlang.png", "edoc-info"]],
ok.
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