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Add support for forcibly overwriting output files; courtesy of OJ Reeves

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This commit is contained in:
Dave Smith 2010-01-30 09:56:06 -07:00
parent 12420ee43c
commit 47e70f308a
1 changed files with 40 additions and 17 deletions
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57
src/rebar_templater.erl
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@ -95,7 +95,8 @@ create(_Config, _) ->
?DEBUG("Final template def ~p: ~p\n", [template_id(), FinalTemplate]), ?DEBUG("Final template def ~p: ~p\n", [template_id(), FinalTemplate]),
%% Execute the instructions in the finalized template %% Execute the instructions in the finalized template
execute_template(FinalTemplate, Type, Template, Context). Force = rebar_config:get_global(force, "0"),
execute_template(FinalTemplate, Type, Template, Context, Force, []).
@ -208,28 +209,50 @@ render(Bin, Context) ->
%% %%
%% Execute each instruction in a template definition file. %% Execute each instruction in a template definition file.
%% %%
execute_template([], _TemplateType, _TemplateName, _Context) -> execute_template([], _TemplateType, _TemplateName, _Context, _Force, ExistingFiles) ->
ok; case length(ExistingFiles) of
execute_template([{file, Input, Output} | Rest], TemplateType, TemplateName, Context) -> 0 ->
InputName = filename:join(filename:dirname(TemplateName), Input), ok;
filelib:ensure_dir(Output), _ ->
case file:write_file(Output, render(load_file(TemplateType, InputName), Context)) of Msg = lists:flatten([io_lib:format("\t* ~p~n", [F]) || F <- lists:reverse(ExistingFiles)]),
ok -> Help = "To force overwriting, specify force=1 on the command line.\n",
execute_template(Rest, TemplateType, TemplateName, Context); ?ERROR("One or more files already exist on disk and were not generated:~n~s~s", [Msg , Help])
{error, Reason} ->
?ABORT("Failed to write output file ~p: ~p\n", [Output, Reason])
end; end;
execute_template([{dir, Name} | Rest], TemplateType, TemplateName, Context) -> execute_template([{file, Input, Output} | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) ->
% determine if the target file already exists
FileExists = filelib:is_file(Output),
% perform the function if we're allowed, otherwise just process the next template
if
Force =:= "1"; FileExists =:= false ->
InputName = filename:join(filename:dirname(TemplateName), Input),
filelib:ensure_dir(Output),
if
{Force, FileExists} =:= {"1", true} ->
?CONSOLE("Writing ~s (forcibly overwriting)~n", [Output]);
true ->
?CONSOLE("Writing ~s~n", [Output])
end,
case file:write_file(Output, render(load_file(TemplateType, InputName), Context)) of
ok ->
execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles);
{error, Reason} ->
?ABORT("Failed to write output file ~p: ~p\n", [Output, Reason])
end;
true ->
execute_template(Rest, TemplateType, TemplateName, Context, Force, [Output|ExistingFiles])
end;
execute_template([{dir, Name} | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) ->
case filelib:ensure_dir(filename:join(Name, "dummy")) of case filelib:ensure_dir(filename:join(Name, "dummy")) of
ok -> ok ->
execute_template(Rest, TemplateType, TemplateName, Context); execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles);
{error, Reason} -> {error, Reason} ->
?ABORT("Failed while processing template instruction {dir, ~s}: ~p\n", ?ABORT("Failed while processing template instruction {dir, ~s}: ~p\n",
[Name, Reason]) [Name, Reason])
end; end;
execute_template([{variables, _} | Rest], TemplateType, TemplateName, Context) -> execute_template([{variables, _} | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) ->
execute_template(Rest, TemplateType, TemplateName, Context); execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles);
execute_template([Other | Rest], TemplateType, TemplateName, Context) -> execute_template([Other | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) ->
?WARN("Skipping unknown template instruction: ~p\n", [Other]), ?WARN("Skipping unknown template instruction: ~p\n", [Other]),
execute_template(Rest, TemplateType, TemplateName, Context). execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles).