diff options
| -rw-r--r-- | src/rebar_templater.erl | 57 |
1 files changed, 40 insertions, 17 deletions
diff --git a/src/rebar_templater.erl b/src/rebar_templater.erl index 675f4bf..4e2e678 100644 --- a/src/rebar_templater.erl +++ b/src/rebar_templater.erl @@ -95,7 +95,8 @@ create(_Config, _) -> ?DEBUG("Final template def ~p: ~p\n", [template_id(), FinalTemplate]), %% 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_template([], _TemplateType, _TemplateName, _Context) -> - ok; -execute_template([{file, Input, Output} | Rest], TemplateType, TemplateName, Context) -> - InputName = filename:join(filename:dirname(TemplateName), Input), - filelib:ensure_dir(Output), - case file:write_file(Output, render(load_file(TemplateType, InputName), Context)) of - ok -> - execute_template(Rest, TemplateType, TemplateName, Context); - {error, Reason} -> - ?ABORT("Failed to write output file ~p: ~p\n", [Output, Reason]) +execute_template([], _TemplateType, _TemplateName, _Context, _Force, ExistingFiles) -> + case length(ExistingFiles) of + 0 -> + ok; + _ -> + Msg = lists:flatten([io_lib:format("\t* ~p~n", [F]) || F <- lists:reverse(ExistingFiles)]), + Help = "To force overwriting, specify force=1 on the command line.\n", + ?ERROR("One or more files already exist on disk and were not generated:~n~s~s", [Msg , Help]) + end; +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) -> +execute_template([{dir, Name} | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) -> case filelib:ensure_dir(filename:join(Name, "dummy")) of ok -> - execute_template(Rest, TemplateType, TemplateName, Context); + execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles); {error, Reason} -> ?ABORT("Failed while processing template instruction {dir, ~s}: ~p\n", [Name, Reason]) end; -execute_template([{variables, _} | Rest], TemplateType, TemplateName, Context) -> - execute_template(Rest, TemplateType, TemplateName, Context); -execute_template([Other | Rest], TemplateType, TemplateName, Context) -> +execute_template([{variables, _} | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) -> + execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles); +execute_template([Other | Rest], TemplateType, TemplateName, Context, Force, ExistingFiles) -> ?WARN("Skipping unknown template instruction: ~p\n", [Other]), - execute_template(Rest, TemplateType, TemplateName, Context). + execute_template(Rest, TemplateType, TemplateName, Context, Force, ExistingFiles). |