%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2009, 2010 Dave Smith (dizzyd@dizzyd.com)
%%
%% Permission is hereby granted, free of charge, to any person obtaining a copy
%% of this software and associated documentation files (the "Software"), to deal
%% in the Software without restriction, including without limitation the rights
%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%% copies of the Software, and to permit persons to whom the Software is
%% furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%% THE SOFTWARE.
%% -------------------------------------------------------------------
-module(rebar_erlc_compiler).
-export([compile/3,
clean/2]).
-include("rebar.hrl").
-include_lib("stdlib/include/erl_compile.hrl").
-define(ERLCINFO_VSN, 1).
-define(ERLCINFO_FILE, "erlcinfo").
-type erlc_info_v() :: {digraph:vertex(), term()} | 'false'.
-type erlc_info_e() :: {digraph:vertex(), digraph:vertex()}.
-type erlc_info() :: {list(erlc_info_v()), list(erlc_info_e())}.
-record(erlcinfo,
{
vsn = ?ERLCINFO_VSN :: pos_integer(),
info = {[], []} :: erlc_info()
}).
-define(RE_PREFIX, "^[^._]").
%% ===================================================================
%% Public API
%% ===================================================================
%% Supported configuration variables:
%%
%% * erl_opts - Erlang list of options passed to compile:file/2
%% It is also possible to specify platform specific
%% options by specifying a pair or a triplet where the
%% first string is a regex that is checked against the
%% string
%%
%% OtpRelease ++ "-" ++ SysArch ++ "-" ++ Words.
%%
%% where
%%
%% OtpRelease = erlang:system_info(otp_release).
%% SysArch = erlang:system_info(system_architecture).
%% Words = integer_to_list(8 *
%% erlang:system_info({wordsize, external})).
%%
%% E.g. to define HAVE_SENDFILE only on systems with
%% sendfile(), to define BACKLOG on Linux/FreeBSD as 128,
%% and to define 'old_inets' for R13 OTP release do:
%%
%% {erl_opts, [{platform_define,
%% "(linux|solaris|freebsd|darwin)",
%% 'HAVE_SENDFILE'},
%% {platform_define, "(linux|freebsd)",
%% 'BACKLOG', 128},
%% {platform_define, "R13",
%% 'old_inets'}]}.
%%
-spec compile(rebar_state:t(), file:name(), file:name()) -> 'ok'.
compile(Config, Dir, OutDir) ->
rebar_base_compiler:run(Config,
check_files(rebar_state:get(
Config, xrl_first_files, [])),
filename:join(Dir, "src"), ".xrl", filename:join(Dir, "src"), ".erl",
fun compile_xrl/3),
rebar_base_compiler:run(Config,
check_files(rebar_state:get(
Config, yrl_first_files, [])),
filename:join(Dir, "src"), ".yrl", filename:join(Dir, "src"), ".erl",
fun compile_yrl/3),
rebar_base_compiler:run(Config,
check_files(rebar_state:get(
Config, mib_first_files, [])),
filename:join(Dir, "mibs"), ".mib", filename:join([Dir, "priv", "mibs"]), ".bin",
fun compile_mib/3),
doterl_compile(Config, Dir, OutDir).
-spec clean(rebar_state:t(), file:filename()) -> 'ok'.
clean(Config, AppDir) ->
MibFiles = rebar_utils:find_files(filename:join(AppDir, "mibs"), ?RE_PREFIX".*\\.mib\$"),
MIBs = [filename:rootname(filename:basename(MIB)) || MIB <- MibFiles],
rebar_file_utils:delete_each(
[filename:join([AppDir, "include",MIB++".hrl"]) || MIB <- MIBs]),
lists:foreach(fun(F) -> ok = rebar_file_utils:rm_rf(F) end,
[filename:join(AppDir, "ebin/*.beam"), filename:join(AppDir, "priv/mibs/*.bin")]),
YrlFiles = rebar_utils:find_files(filename:join(AppDir, "src"), ?RE_PREFIX".*\\.[x|y]rl\$"),
rebar_file_utils:delete_each(
[ binary_to_list(iolist_to_binary(re:replace(F, "\\.[x|y]rl$", ".erl")))
|| F <- YrlFiles ]),
%% Delete the build graph, if any
rebar_file_utils:rm_rf(erlcinfo_file(Config)),
%% Erlang compilation is recursive, so it's possible that we have a nested
%% directory structure in ebin with .beam files within. As such, we want
%% to scan whatever is left in the ebin/ directory for sub-dirs which
%% satisfy our criteria.
BeamFiles = rebar_utils:find_files(filename:join(AppDir, "ebin"), ?RE_PREFIX".*\\.beam\$"),
rebar_file_utils:delete_each(BeamFiles),
lists:foreach(fun(Dir) -> delete_dir(Dir, dirs(Dir)) end, dirs(filename:join(AppDir, "ebin"))),
ok.
%% ===================================================================
%% Internal functions
%% ===================================================================
-spec doterl_compile(rebar_state:t(), file:filename(), file:filename()) -> ok.
doterl_compile(State, Dir, ODir) ->
ErlOpts = rebar_utils:erl_opts(State),
doterl_compile(State, Dir, ODir, [], ErlOpts).
doterl_compile(Config, Dir, ODir, MoreSources, ErlOpts) ->
OutDir = filename:join(ODir, "ebin"),
ErlFirstFilesConf = rebar_state:get(Config, erl_first_files, []),
?DEBUG("erl_opts ~p", [ErlOpts]),
%% Support the src_dirs option allowing multiple directories to
%% contain erlang source. This might be used, for example, should
%% eunit tests be separated from the core application source.
SrcDirs = [filename:join(Dir, X) || X <- proplists:get_value(src_dirs, ErlOpts, ["src"])],
AllErlFiles = gather_src(SrcDirs, []) ++ MoreSources,
%% Issue: rebar/rebar3#140 (fix matching based on same path + order of
%% erl_first_files)
ErlFirstFiles = get_erl_first_files(ErlFirstFilesConf, AllErlFiles),
RestErls = [ File || File <- AllErlFiles,
not lists:member(File, ErlFirstFiles) ],
%% Make sure that ebin/ exists and is on the path
ok = filelib:ensure_dir(filename:join(OutDir, "dummy.beam")),
CurrPath = code:get_path(),
true = code:add_path(filename:absname(OutDir)),
OutDir1 = proplists:get_value(outdir, ErlOpts, OutDir),
G = init_erlcinfo(Config, AllErlFiles),
%% Split RestErls so that files which are depended on are treated
%% like erl_first_files.
{OtherFirstErls, OtherErls} =
lists:partition(
fun(F) ->
Children = get_children(G, F),
log_files(?FMT("Files dependent on ~s", [F]), Children),
case erls(Children) of
[] ->
%% There are no files dependent on this file.
false;
_ ->
%% There are some files dependent on the file.
%% Thus the file has higher priority
%% and should be compiled in the first place.
true
end
end, RestErls),
%% Dependencies of OtherFirstErls that must be compiled first.
OtherFirstErlsDeps = lists:flatmap(
fun(Erl) -> erls(get_parents(G, Erl)) end,
OtherFirstErls),
%% NOTE: In case the way we retrieve OtherFirstErlsDeps or merge
%% it with OtherFirstErls does not result in the correct compile
%% priorities, or the method in use proves to be too slow for
%% certain projects, consider using a more elaborate method (maybe
%% digraph_utils) or alternatively getting and compiling the .erl
%% parents of an individual Source in internal_erl_compile. By not
%% handling this in internal_erl_compile, we also avoid extra
%% needs_compile/2 calls.
FirstErls = ErlFirstFiles ++ uo_merge(OtherFirstErlsDeps, OtherFirstErls),
?DEBUG("Files to compile first: ~p", [FirstErls]),
rebar_base_compiler:run(
Config, FirstErls, OtherErls,
fun(S, C) ->
internal_erl_compile(C, Dir, S, OutDir1, ErlOpts, G)
end),
true = code:set_path(CurrPath),
ok.
%%
%% Return all .erl files from a list of files
%%
erls(Files) ->
[Erl || Erl <- Files, filename:extension(Erl) =:= ".erl"].
%%
%% Return a list of erl_first_files in order as specified in rebar.config
%% using the path from AllFiles.
%%
get_erl_first_files(FirstFiles, AllFiles) ->
BaseFirstFiles = [filename:basename(F) || F <- FirstFiles],
IndexedAllFiles = [{filename:basename(F), F} || F <- AllFiles ],
[ proplists:get_value(FileName, IndexedAllFiles) ||
FileName <- BaseFirstFiles,
proplists:is_defined(FileName, IndexedAllFiles) ].
%%
%% Return a list without duplicates while preserving order
%%
ulist(L) ->
ulist(L, []).
ulist([H|T], Acc) ->
case lists:member(H, T) of
true ->
ulist(T, Acc);
false ->
ulist(T, [H|Acc])
end;
ulist([], Acc) ->
lists:reverse(Acc).
%%
%% Merge two lists without duplicates while preserving order
%%
uo_merge(L1, L2) ->
lists:foldl(fun(E, Acc) -> u_add_element(E, Acc) end, ulist(L1), L2).
u_add_element(Elem, [Elem|_]=Set) -> Set;
u_add_element(Elem, [E1|Set]) -> [E1|u_add_element(Elem, Set)];
u_add_element(Elem, []) -> [Elem].
-spec include_path(file:filename(),
rebar_state:t()) -> [file:filename(), ...].
include_path(Source, Config) ->
ErlOpts = rebar_state:get(Config, erl_opts, []),
Dir = filename:join(rebar_utils:droplast(filename:split(filename:dirname(Source)))),
lists:usort([filename:join(Dir, "include"), filename:dirname(Source)]
++ proplists:get_all_values(i, ErlOpts)).
-spec needs_compile(file:filename(), file:filename(),
list(), [string()]) -> boolean().
needs_compile(Source, Target, Opts, Parents) ->
TargetLastMod = filelib:last_modified(Target),
F = fun(I) -> source_changed(TargetLastMod, I) end,
lists:any(F, [Source] ++ Parents) orelse opts_changed(Opts, Target).
source_changed(TargetLastMod, I) -> TargetLastMod < filelib:last_modified(I).
opts_changed(Opts, Target) ->
Basename = filename:basename(Target, ".beam"),
Dirname = filename:dirname(Target),
ObjectFile = filename:join([Dirname, Basename]),
_ = purge(list_to_atom(Basename)),
case code:load_abs(ObjectFile) of
{module, Mod} ->
Compile = Mod:module_info(compile),
lists:sort(Opts) =/= lists:sort(proplists:get_value(options,
Compile));
{error, nofile} -> false
end.
purge(Mod) ->
%% remove old code if necessary
_ = code:purge(Mod),
%% move current code to old
_ = code:delete(Mod).
check_erlcinfo(_Config, #erlcinfo{vsn=?ERLCINFO_VSN}) ->
ok;
check_erlcinfo(Config, #erlcinfo{vsn=Vsn}) ->
?ABORT("~s file version is incompatible. expected: ~b got: ~b",
[erlcinfo_file(Config), ?ERLCINFO_VSN, Vsn]);
check_erlcinfo(Config, _) ->
?ABORT("~s file is invalid. Please delete before next run.",
[erlcinfo_file(Config)]).
erlcinfo_file(_Config) ->
filename:join(rebar_dir:local_cache_dir(), ?ERLCINFO_FILE).
init_erlcinfo(Config, Erls) ->
G = restore_erlcinfo(Config),
%% Get a unique list of dirs based on the source files' locations.
%% This is used for finding files in sub dirs of the configured
%% src_dirs. For example, src/sub_dir/foo.erl.
Dirs = sets:to_list(lists:foldl(
fun(Erl, Acc) ->
Dir = filename:dirname(Erl),
sets:add_element(Dir, Acc)
end, sets:new(), Erls)),
Updates = [update_erlcinfo(G, Erl, include_path(Erl, Config) ++ Dirs)
|| Erl <- Erls],
Modified = lists:member(modified, Updates),
ok = store_erlcinfo(G, Config, Modified),
G.
update_erlcinfo(G, Source, Dirs) ->
case digraph:vertex(G, Source) of
{_, LastUpdated} ->
case filelib:last_modified(Source) of
0 ->
%% The file doesn't exist anymore,
%% erase it from the graph.
%% All the edges will be erased automatically.
digraph:del_vertex(G, Source),
modified;
LastModified when LastUpdated < LastModified ->
modify_erlcinfo(G, Source, Dirs),
modified;
_ ->
unmodified
end;
false ->
modify_erlcinfo(G, Source, Dirs),
modified
end.
modify_erlcinfo(G, Source, Dirs) ->
{ok, Fd} = file:open(Source, [read]),
Incls = parse_attrs(Fd, []),
AbsIncls = expand_file_names(Incls, Dirs),
ok = file:close(Fd),
LastUpdated = {date(), time()},
digraph:add_vertex(G, Source, LastUpdated),
lists:foreach(
fun(Incl) ->
update_erlcinfo(G, Incl, Dirs),
digraph:add_edge(G, Source, Incl)
end, AbsIncls).
restore_erlcinfo(Config) ->
File = erlcinfo_file(Config),
G = digraph:new(),
case file:read_file(File) of
{ok, Data} ->
try binary_to_term(Data) of
Erlcinfo ->
ok = check_erlcinfo(Config, Erlcinfo),
#erlcinfo{info=ErlcInfo} = Erlcinfo,
{Vs, Es} = ErlcInfo,
lists:foreach(
fun({V, LastUpdated}) ->
digraph:add_vertex(G, V, LastUpdated)
end, Vs),
lists:foreach(
fun({V1, V2}) ->
digraph:add_edge(G, V1, V2)
end, Es)
catch
error:badarg ->
?ERROR(
"Failed (binary_to_term) to restore rebar info file."
" Discard file.", []),
ok
end;
_Err ->
ok
end,
G.
store_erlcinfo(_G, _Config, _Modified = false) ->
ok;
store_erlcinfo(G, Config, _Modified) ->
Vs = lists:map(
fun(V) ->
digraph:vertex(G, V)
end, digraph:vertices(G)),
Es = lists:flatmap(
fun({V, _}) ->
lists:map(
fun(E) ->
{_, V1, V2, _} = digraph:edge(G, E),
{V1, V2}
end, digraph:out_edges(G, V))
end, Vs),
File = erlcinfo_file(Config),
ok = filelib:ensure_dir(File),
Data = term_to_binary(#erlcinfo{info={Vs, Es}}, [{compressed, 9}]),
file:write_file(File, Data).
%% NOTE: If, for example, one of the entries in Files, refers to
%% gen_server.erl, that entry will be dropped. It is dropped because
%% such an entry usually refers to the beam file, and we don't pass a
%% list of OTP src dirs for finding gen_server.erl's full path. Also,
%% if gen_server.erl was modified, it's not rebar's task to compile a
%% new version of the beam file. Therefore, it's reasonable to drop
%% such entries. Also see process_attr(behaviour, Form, Includes).
-spec expand_file_names([file:filename()],
[file:filename()]) -> [file:filename()].
expand_file_names(Files, Dirs) ->
%% We check if Files exist by itself or within the directories
%% listed in Dirs.
%% Return the list of files matched.
lists:flatmap(
fun(Incl) ->
case filelib:is_regular(Incl) of
true ->
[Incl];
false ->
lists:flatmap(
fun(Dir) ->
FullPath = filename:join(Dir, Incl),
case filelib:is_regular(FullPath) of
true ->
[FullPath];
false ->
[]
end
end, Dirs)
end
end, Files).
-spec get_parents(rebar_digraph(), file:filename()) -> [file:filename()].
get_parents(G, Source) ->
%% Return all files which the Source depends upon.
digraph_utils:reachable_neighbours([Source], G).
-spec get_children(rebar_digraph(), file:filename()) -> [file:filename()].
get_children(G, Source) ->
%% Return all files dependent on the Source.
digraph_utils:reaching_neighbours([Source], G).
-spec internal_erl_compile(rebar_state:t(), file:filename(), file:filename(),
file:filename(), list(),
rebar_digraph()) -> 'ok' | 'skipped'.
internal_erl_compile(Config, Dir, Source, OutDir, ErlOpts, G) ->
%% Determine the target name and includes list by inspecting the source file
Module = filename:basename(Source, ".erl"),
Parents = get_parents(G, Source),
log_files(?FMT("Dependencies of ~s", [Source]), Parents),
%% Construct the target filename
Target = filename:join([OutDir | string:tokens(Module, ".")]) ++ ".beam",
ok = filelib:ensure_dir(Target),
%% Construct the compile opts
Opts = [{outdir, filename:dirname(Target)}] ++
ErlOpts ++ [{i, filename:join(Dir, "include")}],
%% If the file needs compilation, based on last mod date of includes or
%% the target
case needs_compile(Source, Target, Opts, Parents) of
true ->
case compile:file(Source, Opts ++ [return]) of
{ok, _Mod} ->
ok;
{ok, _Mod, Ws} ->
rebar_base_compiler:ok_tuple(Config, Source, Ws);
{error, Es, Ws} ->
rebar_base_compiler:error_tuple(Config, Source,
Es, Ws, Opts)
end;
false ->
skipped
end.
-spec compile_mib(file:filename(), file:filename(),
rebar_state:t()) -> 'ok'.
compile_mib(Source, Target, Config) ->
ok = filelib:ensure_dir(Target),
ok = filelib:ensure_dir(filename:join("include", "dummy.hrl")),
Opts = [{outdir, "priv/mibs"}, {i, ["priv/mibs"]}] ++
rebar_state:get(Config, mib_opts, []),
case snmpc:compile(Source, Opts) of
{ok, _} ->
Mib = filename:rootname(Target),
MibToHrlOpts =
case proplists:get_value(verbosity, Opts, undefined) of
undefined ->
#options{specific = []};
Verbosity ->
#options{specific = [{verbosity, Verbosity}]}
end,
ok = snmpc:mib_to_hrl(Mib, Mib, MibToHrlOpts),
Hrl_filename = Mib ++ ".hrl",
rebar_file_utils:mv(Hrl_filename, "include"),
ok;
{error, compilation_failed} ->
?FAIL
end.
-spec compile_xrl(file:filename(), file:filename(),
rebar_state:t()) -> 'ok'.
compile_xrl(Source, Target, Config) ->
Opts = [{scannerfile, Target} | rebar_state:get(Config, xrl_opts, [])],
compile_xrl_yrl(Config, Source, Target, Opts, leex).
-spec compile_yrl(file:filename(), file:filename(),
rebar_state:t()) -> 'ok'.
compile_yrl(Source, Target, Config) ->
Opts = [{parserfile, Target} | rebar_state:get(Config, yrl_opts, [])],
compile_xrl_yrl(Config, Source, Target, Opts, yecc).
-spec compile_xrl_yrl(rebar_state:t(), file:filename(),
file:filename(), list(), module()) -> 'ok'.
compile_xrl_yrl(Config, Source, Target, Opts, Mod) ->
Dir = rebar_state:dir(Config),
Opts1 = [{includefile, filename:join(Dir, I)} || {includefile, I} <- Opts,
filename:pathtype(I) =:= relative],
case needs_compile(Source, Target, Opts1, []) of
true ->
case Mod:file(Source, Opts1 ++ [{return, true}]) of
{ok, _} ->
ok;
{ok, _Mod, Ws} ->
rebar_base_compiler:ok_tuple(Config, Source, Ws);
{error, Es, Ws} ->
rebar_base_compiler:error_tuple(Config, Source,
Es, Ws, Opts1)
end;
false ->
skipped
end.
gather_src([], Srcs) ->
Srcs;
gather_src([Dir|Rest], Srcs) ->
gather_src(
Rest, Srcs ++ rebar_utils:find_files(Dir, ?RE_PREFIX".*\\.erl\$")).
-spec dirs(file:filename()) -> [file:filename()].
dirs(Dir) ->
[F || F <- filelib:wildcard(filename:join([Dir, "*"])), filelib:is_dir(F)].
-spec delete_dir(file:filename(), [string()]) -> 'ok' | {'error', atom()}.
delete_dir(Dir, []) ->
file:del_dir(Dir);
delete_dir(Dir, Subdirs) ->
lists:foreach(fun(D) -> delete_dir(D, dirs(D)) end, Subdirs),
file:del_dir(Dir).
parse_attrs(Fd, Includes) ->
case io:parse_erl_form(Fd, "") of
{ok, Form, _Line} ->
case erl_syntax:type(Form) of
attribute ->
NewIncludes = process_attr(Form, Includes),
parse_attrs(Fd, NewIncludes);
_ ->
parse_attrs(Fd, Includes)
end;
{eof, _} ->
Includes;
_Err ->
parse_attrs(Fd, Includes)
end.
process_attr(Form, Includes) ->
try
AttrName = erl_syntax:atom_value(erl_syntax:attribute_name(Form)),
process_attr(AttrName, Form, Includes)
catch _:_ ->
%% TODO: We should probably try to be more specific here
%% and not suppress all errors.
Includes
end.
process_attr(import, Form, Includes) ->
case erl_syntax_lib:analyze_import_attribute(Form) of
{Mod, _Funs} ->
[atom_to_list(Mod) ++ ".erl"|Includes];
Mod ->
[atom_to_list(Mod) ++ ".erl"|Includes]
end;
process_attr(file, Form, Includes) ->
{File, _} = erl_syntax_lib:analyze_file_attribute(Form),
[File|Includes];
process_attr(include, Form, Includes) ->
[FileNode] = erl_syntax:attribute_arguments(Form),
File = erl_syntax:string_value(FileNode),
[File|Includes];
process_attr(include_lib, Form, Includes) ->
[FileNode] = erl_syntax:attribute_arguments(Form),
RawFile = erl_syntax:string_value(FileNode),
File = maybe_expand_include_lib_path(RawFile),
[File|Includes];
process_attr(behaviour, Form, Includes) ->
[FileNode] = erl_syntax:attribute_arguments(Form),
File = erl_syntax:atom_name(FileNode) ++ ".erl",
[File|Includes];
process_attr(compile, Form, Includes) ->
[Arg] = erl_syntax:attribute_arguments(Form),
case erl_syntax:concrete(Arg) of
{parse_transform, Mod} ->
[atom_to_list(Mod) ++ ".erl"|Includes];
{core_transform, Mod} ->
[atom_to_list(Mod) ++ ".erl"|Includes];
L when is_list(L) ->
lists:foldl(
fun({parse_transform, M}, Acc) ->
[atom_to_list(M) ++ ".erl"|Acc];
({core_transform, M}, Acc) ->
[atom_to_list(M) ++ ".erl"|Acc];
(_, Acc) ->
Acc
end, Includes, L)
end.
%% Given the filename from an include_lib attribute, if the path
%% exists, return unmodified, or else get the absolute ERL_LIBS
%% path.
maybe_expand_include_lib_path(File) ->
case filelib:is_regular(File) of
true ->
File;
false ->
expand_include_lib_path(File)
end.
%% Given a path like "stdlib/include/erl_compile.hrl", return
%% "OTP_INSTALL_DIR/lib/erlang/lib/stdlib-x.y.z/include/erl_compile.hrl".
%% Usually a simple [Lib, SubDir, File1] = filename:split(File) should
%% work, but to not crash when an unusual include_lib path is used,
%% utilize more elaborate logic.
expand_include_lib_path(File) ->
File1 = filename:basename(File),
Split = filename:split(filename:dirname(File)),
Lib = hd(Split),
SubDir = filename:join(tl(Split)),
Dir = code:lib_dir(list_to_atom(Lib), list_to_atom(SubDir)),
filename:join(Dir, File1).
%%
%% Ensure all files in a list are present and abort if one is missing
%%
-spec check_files([file:filename()]) -> [file:filename()].
check_files(FileList) ->
[check_file(F) || F <- FileList].
check_file(File) ->
case filelib:is_regular(File) of
false -> ?ABORT("File ~p is missing, aborting\n", [File]);
true -> File
end.
%% Print prefix followed by list of files. If the list is empty, print
%% on the same line, otherwise use a separate line.
log_files(Prefix, Files) ->
case Files of
[] ->
?DEBUG("~s: ~p", [Prefix, Files]);
_ ->
?DEBUG("~s:~n~p", [Prefix, Files])
end.