diff options
Diffstat (limited to 'src/rlx_dscv_util.erl')
| -rw-r--r-- | src/rlx_dscv_util.erl | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/rlx_dscv_util.erl b/src/rlx_dscv_util.erl new file mode 100644 index 0000000..68dcb68 --- /dev/null +++ b/src/rlx_dscv_util.erl @@ -0,0 +1,142 @@ +%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*- +%%% Copyright 2012 Erlware, LLC. All Rights Reserved. +%%% +%%% This file is provided to you 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. +%%%--------------------------------------------------------------------------- +%%% @author Eric Merritt <[email protected]> +%%% @copyright (C) 2012 Erlware, LLC. +%%% +%%% @doc This provider uses the lib_dir setting of the state. It searches the +%%% Lib Dirs looking for all OTP Applications that are available. When it finds +%%% those OTP Applications it loads the information about them and adds them to +%%% the state of available apps. This implements the rcl_provider behaviour. +-module(rcl_dscv_util). + +-export([do/2, + format_error/1]). + +-include_lib("relcool/include/relcool.hrl"). + +%%============================================================================ +%% Types +%%============================================================================ + +-type process_fun(Result) :: fun((filename:name(), file | directory) -> + {ok, Result} | + {error, term()} | + {ok, Result, Recurse::boolean()} | + {noresult, Recurse::boolean()} | + {error, term()}). + +%%============================================================================ +%% API +%%============================================================================ + +%% @doc recursively dig down into the library directories specified in the state +%% looking for OTP Applications +-spec do(process_fun([term()] | term()), [filename:name()]) -> + [term() | {error, term()}]. +do(ProcessDir, LibDirs) -> + lists:flatten(ec_plists:map(fun(LibDir) -> + discover_dir(ProcessDir, LibDir, + ec_file:type(LibDir)) + end, LibDirs)). + +-spec format_error([ErrorDetail::term()]) -> iolist(). +format_error(ErrorDetails) + when erlang:is_list(ErrorDetails) -> + [[format_detail(ErrorDetail), "\n"] || ErrorDetail <- ErrorDetails]. + +%%%=================================================================== +%%% Internal Functions +%%%=================================================================== +-spec format_detail(ErrorDetail::term()) -> iolist(). +format_detail({accessing, File, eaccess}) -> + io_lib:format("permission denied accessing file ~s", [File]); +format_detail({accessing, File, Type}) -> + io_lib:format("error (~p) accessing file ~s", [Type, File]); +format_detail({not_a_directory, EbinDir}) -> + io_lib:format("~s is not a directory when it should be a directory", [EbinDir]). + +-spec discover_dir(process_fun([term()] | term()), + file:name(), + directory | file | symlink) -> + [{ok, term()} + | {error, Reason::term()}] + | [] + | {ok, term()} + | {error, Reason::term()}. +discover_dir(ProcessDir, File, directory) -> + case ProcessDir(File, directory) of + {ok, Result, true} -> + [{ok, Result} | recurse(ProcessDir, File)]; + {noresult, true} -> + recurse(ProcessDir, File); + {ok, Result, _} -> + [{ok, Result}]; + {noresult, _} -> + []; + Err = {error, _} -> + [Err] + end; +discover_dir(ProcessDir, File, file) -> + case ProcessDir(File, file) of + {ok, Result} -> + [{ok, Result}]; + {noresult, _} -> + []; + Err = {error, _} -> + [Err] + end; +discover_dir(ProcessDir, File, symlink) -> + case filelib:is_dir(File) of + false -> + discover_dir(ProcessDir, File, file); + true -> + discover_real_symlink_dir(ProcessDir, File) + end. + +discover_real_symlink_dir(ProcessDir, File) -> + {ok, CurCwd} = file:get_cwd(), + ok = file:set_cwd(File), + {ok, ActualRealDir} = file:get_cwd(), + ok = file:set_cwd(CurCwd), + lists:prefix(iolist_to_list(filename:absname(ActualRealDir)), + iolist_to_list(filename:absname(File))), + case ProcessDir(File, directory) of + {ok, Result, true} -> + [{ok, Result} | recurse(ProcessDir, File)]; + {noresult, true} -> + recurse(ProcessDir, File); + {ok, Result, _} -> + [{ok, Result}]; + {noresult, _} -> + []; + Err = {error, _} -> + [Err] + end. + +recurse(ProcessDir, File) -> + case file:list_dir(File) of + {error, Reason} -> + {error, {accessing, File, Reason}}; + {ok, List} -> + ec_plists:map(fun(LibDir) -> + discover_dir(ProcessDir, LibDir, ec_file:type(LibDir)) + end, [filename:join([File, Dir]) || Dir <- List]) + end. + +iolist_to_list(IoList) -> + erlang:binary_to_list(erlang:iolist_to_binary(IoList)). |