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zotonic_stdlib

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Zotonic standard library

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zotonic_stdlib src z_filelib.erl
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src/z_filelib.erl 

%% @author Marc Worrell <marc@worrell.nl>

%% @copyright 2017 Marc Worrell

%%

%% @doc Extra file functions.



%% Copyright 2017 Marc Worrell

%%

%% 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.



-module(z_filelib).



-export([

    ensure_dir/1

    ]).



%% @doc Ensure the directory of a file is present. This will still work

%%      if a soft-link in the path refers to a missing directory.

-spec ensure_dir(file:filename_all()) -> ok | {error, term()}.

ensure_dir(Filename) ->

    case filelib:ensure_dir(Filename) of

        ok -> ok;

        {error, enoent} ->

            % Could be that there is a softlink to a missing directory in the path

            {LinkFile, Rest} = first_missing(filename:split(Filename), []),

            case file:read_link(LinkFile) of

                {ok, Link} ->

                    case make_link_target(Link, LinkFile, Rest) of

                        ok -> ensure_dir(Filename);

                        {error, _} = Error -> Error

                    end;

                {error, _} = Error ->

                    Error

            end;

        {error, _} = Error ->

            Error

    end.



make_link_target(Link, LinkFile, Rest) ->

    Target = case is_relative(Link) of

        true -> filename:join([ filename:dirname(LinkFile), Link ]);

        false -> Link

    end,

    case Rest of

        [] -> filelib:ensure_dir(filename:join([ Target ]));

        _ -> filelib:ensure_dir(filename:join([ Target, hd(Rest) ]))

    end.



is_relative(Path) ->

    case filename:split(Path) of

        [".."|_] -> true;

        ["."|_] -> true;

        [<<"..">>|_] -> true;

        [<<".">>|_] -> true;

        _ -> false

    end.





first_missing([], Acc) ->

    lists:reverse(Acc);

first_missing([P|Ps], Acc) ->

    Acc1 = [P|Acc],

    Path = filename:join(lists:reverse(Acc1)),

    case filelib:is_file(Path) of

        true -> first_missing(Ps, [P|Acc]);

        false -> {Path, Ps}

    end.