mirror of
https://github.com/correl/rebar.git
synced 2024-12-18 03:00:17 +00:00
407 lines
16 KiB
Erlang
407 lines
16 KiB
Erlang
%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
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%% ex: ts=4 sw=4 et
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%% -------------------------------------------------------------------
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%%
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%% rebar: Erlang Build Tools
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%%
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%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com)
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%%
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%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%% of this software and associated documentation files (the "Software"), to deal
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%% in the Software without restriction, including without limitation the rights
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%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%% copies of the Software, and to permit persons to whom the Software is
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%% furnished to do so, subject to the following conditions:
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%%
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%% The above copyright notice and this permission notice shall be included in
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%% all copies or substantial portions of the Software.
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%%
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%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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%% THE SOFTWARE.
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%% -------------------------------------------------------------------
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-module(rebar_templater).
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-export(['create-app'/2,
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'create-node'/2,
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'list-templates'/2,
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create/2]).
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%% API for other utilities that need templating functionality
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-export([resolve_variables/2,
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render/2]).
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-include("rebar.hrl").
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-define(TEMPLATE_RE, ".*\\.template\$").
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%% ===================================================================
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%% Public API
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%% ===================================================================
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'create-app'(Config, _File) ->
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%% Alias for create w/ template=simpleapp
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create1(Config, "simpleapp").
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'create-node'(Config, _File) ->
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%% Alias for create w/ template=simplenode
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create1(Config, "simplenode").
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'list-templates'(Config, _File) ->
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{AvailTemplates, Files} = find_templates(Config),
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?DEBUG("Available templates: ~p\n", [AvailTemplates]),
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lists:foreach(
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fun({Type, F}) ->
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BaseName = filename:basename(F, ".template"),
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TemplateTerms = consult(load_file(Files, Type, F)),
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{_, VarList} = lists:keyfind(variables, 1, TemplateTerms),
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Vars = lists:foldl(fun({V,_}, Acc) ->
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[atom_to_list(V) | Acc]
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end, [], VarList),
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?CONSOLE(" * ~s: ~s (~p) (variables: ~p)\n",
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[BaseName, F, Type, string:join(Vars, ", ")])
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end, AvailTemplates),
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ok.
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create(Config, _) ->
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TemplateId = template_id(Config),
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create1(Config, TemplateId).
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%%
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%% Given a list of key value pairs, for each string value attempt to
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%% render it using Dict as the context. Storing the result in Dict as Key.
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%%
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resolve_variables([], Dict) ->
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Dict;
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resolve_variables([{Key, Value0} | Rest], Dict) when is_list(Value0) ->
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Value = render(list_to_binary(Value0), Dict),
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resolve_variables(Rest, dict:store(Key, Value, Dict));
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resolve_variables([_Pair | Rest], Dict) ->
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resolve_variables(Rest, Dict).
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%%
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%% Render a binary to a string, using mustache and the specified context
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%%
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render(Bin, Context) ->
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%% Be sure to escape any double-quotes before rendering...
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ReOpts = [global, {return, list}],
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Str0 = re:replace(Bin, "\\\\", "\\\\\\", ReOpts),
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Str1 = re:replace(Str0, "\"", "\\\\\"", ReOpts),
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mustache:render(Str1, Context).
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%% ===================================================================
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%% Internal functions
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%% ===================================================================
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create1(Config, TemplateId) ->
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{AvailTemplates, Files} = find_templates(Config),
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?DEBUG("Available templates: ~p\n", [AvailTemplates]),
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%% Using the specified template id, find the matching template file/type.
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%% Note that if you define the same template in both ~/.rebar/templates
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%% that is also present in the escript, the one on the file system will
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%% be preferred.
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{Type, Template} = select_template(AvailTemplates, TemplateId),
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%% Load the template definition as is and get the list of variables the
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%% template requires.
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TemplateTerms = consult(load_file(Files, Type, Template)),
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case lists:keyfind(variables, 1, TemplateTerms) of
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{variables, Vars} ->
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case parse_vars(Vars, dict:new()) of
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{error, Entry} ->
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Context0 = undefined,
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?ABORT("Failed while processing variables from template ~p."
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"Variable definitions must follow form of "
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"[{atom(), term()}]. Failed at: ~p\n",
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[TemplateId, Entry]);
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Context0 ->
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ok
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end;
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false ->
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?WARN("No variables section found in template ~p; "
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"using empty context.\n", [TemplateId]),
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Context0 = dict:new()
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end,
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%% Load variables from disk file, if provided
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Context1 = case rebar_config:get_global(Config, template_vars, undefined) of
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undefined ->
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Context0;
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File ->
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case file:consult(File) of
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{ok, Terms} ->
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%% TODO: Cleanup/merge with similar code in rebar_reltool
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M = fun(_Key, _Base, Override) -> Override end,
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dict:merge(M, Context0, dict:from_list(Terms));
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{error, Reason} ->
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?ABORT("Unable to load template_vars from ~s: ~p\n",
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[File, Reason])
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end
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end,
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%% For each variable, see if it's defined in global vars -- if it is,
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%% prefer that value over the defaults
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Context2 = update_vars(Config, dict:fetch_keys(Context1), Context1),
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?DEBUG("Template ~p context: ~p\n", [TemplateId, dict:to_list(Context1)]),
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%% Handle variables that possibly include other variables in their
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%% definition
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Context = resolve_variables(dict:to_list(Context2), Context2),
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?DEBUG("Resolved Template ~p context: ~p\n",
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[TemplateId, dict:to_list(Context)]),
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%% Now, use our context to process the template definition -- this
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%% permits us to use variables within the definition for filenames.
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FinalTemplate = consult(render(load_file(Files, Type, Template), Context)),
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?DEBUG("Final template def ~p: ~p\n", [TemplateId, FinalTemplate]),
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%% Execute the instructions in the finalized template
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Force = rebar_config:get_global(Config, force, "0"),
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execute_template(Files, FinalTemplate, Type, Template, Context, Force, []).
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find_templates(Config) ->
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%% Load a list of all the files in the escript -- cache them since
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%% we'll potentially need to walk it several times over the course of
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%% a run.
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Files = cache_escript_files(Config),
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%% Build a list of available templates
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AvailTemplates = find_disk_templates(Config)
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++ find_escript_templates(Files),
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{AvailTemplates, Files}.
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%%
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%% Scan the current escript for available files
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%%
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cache_escript_files(Config) ->
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{ok, Files} = rebar_utils:escript_foldl(
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fun(Name, _, GetBin, Acc) ->
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[{Name, GetBin()} | Acc]
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end,
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[], rebar_config:get_xconf(Config, escript)),
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Files.
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template_id(Config) ->
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case rebar_config:get_global(Config, template, undefined) of
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undefined ->
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?ABORT("No template specified.\n", []);
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TemplateId ->
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TemplateId
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end.
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find_escript_templates(Files) ->
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[{escript, Name}
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|| {Name, _Bin} <- Files,
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re:run(Name, ?TEMPLATE_RE, [{capture, none}]) == match].
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find_disk_templates(Config) ->
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OtherTemplates = find_other_templates(Config),
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HomeFiles = rebar_utils:find_files(filename:join([os:getenv("HOME"),
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".rebar", "templates"]),
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?TEMPLATE_RE),
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LocalFiles = rebar_utils:find_files(".", ?TEMPLATE_RE),
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[{file, F} || F <- OtherTemplates ++ HomeFiles ++ LocalFiles].
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find_other_templates(Config) ->
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case rebar_config:get_global(Config, template_dir, undefined) of
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undefined ->
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[];
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TemplateDir ->
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rebar_utils:find_files(TemplateDir, ?TEMPLATE_RE)
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end.
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select_template([], Template) ->
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?ABORT("Template ~s not found.\n", [Template]);
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select_template([{Type, Avail} | Rest], Template) ->
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case filename:basename(Avail, ".template") == Template of
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true ->
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{Type, Avail};
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false ->
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select_template(Rest, Template)
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end.
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%%
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%% Read the contents of a file from the appropriate source
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%%
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load_file(Files, escript, Name) ->
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{Name, Bin} = lists:keyfind(Name, 1, Files),
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Bin;
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load_file(_Files, file, Name) ->
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{ok, Bin} = file:read_file(Name),
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Bin.
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%%
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%% Parse/validate variables out from the template definition
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%%
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parse_vars([], Dict) ->
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Dict;
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parse_vars([{Key, Value} | Rest], Dict) when is_atom(Key) ->
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parse_vars(Rest, dict:store(Key, Value, Dict));
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parse_vars([Other | _Rest], _Dict) ->
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{error, Other};
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parse_vars(Other, _Dict) ->
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{error, Other}.
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%%
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%% Given a list of keys in Dict, see if there is a corresponding value defined
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%% in the global config; if there is, update the key in Dict with it
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%%
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update_vars(_Config, [], Dict) ->
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Dict;
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update_vars(Config, [Key | Rest], Dict) ->
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Value = rebar_config:get_global(Config, Key, dict:fetch(Key, Dict)),
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update_vars(Config, Rest, dict:store(Key, Value, Dict)).
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%%
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%% Given a string or binary, parse it into a list of terms, ala file:consult/1
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%%
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consult(Str) when is_list(Str) ->
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consult([], Str, []);
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consult(Bin) when is_binary(Bin)->
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consult([], binary_to_list(Bin), []).
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consult(Cont, Str, Acc) ->
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case erl_scan:tokens(Cont, Str, 0) of
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{done, Result, Remaining} ->
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case Result of
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{ok, Tokens, _} ->
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{ok, Term} = erl_parse:parse_term(Tokens),
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consult([], Remaining, [Term | Acc]);
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{eof, _Other} ->
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lists:reverse(Acc);
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{error, Info, _} ->
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{error, Info}
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end;
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{more, Cont1} ->
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consult(Cont1, eof, Acc)
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end.
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write_file(Output, Data, Force) ->
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%% determine if the target file already exists
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FileExists = filelib:is_regular(Output),
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%% perform the function if we're allowed,
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%% otherwise just process the next template
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case Force =:= "1" orelse FileExists =:= false of
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true ->
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ok = filelib:ensure_dir(Output),
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case {Force, FileExists} of
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{"1", true} ->
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?CONSOLE("Writing ~s (forcibly overwriting)~n",
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[Output]);
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_ ->
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?CONSOLE("Writing ~s~n", [Output])
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end,
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case file:write_file(Output, Data) of
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ok ->
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ok;
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{error, Reason} ->
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?ABORT("Failed to write output file ~p: ~p\n",
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[Output, Reason])
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end;
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false ->
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{error, exists}
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end.
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%%
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%% Execute each instruction in a template definition file.
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%%
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execute_template(_Files, [], _TemplateType, _TemplateName,
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_Context, _Force, ExistingFiles) ->
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case ExistingFiles of
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[] ->
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ok;
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_ ->
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Msg = lists:flatten([io_lib:format("\t* ~p~n", [F]) ||
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F <- lists:reverse(ExistingFiles)]),
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Help = "To force overwriting, specify -f/--force/force=1"
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" on the command line.\n",
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?ERROR("One or more files already exist on disk and "
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"were not generated:~n~s~s", [Msg , Help])
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end;
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execute_template(Files, [{template, Input, Output} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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InputName = filename:join(filename:dirname(TemplateName), Input),
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File = load_file(Files, TemplateType, InputName),
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case write_file(Output, render(File, Context), Force) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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{error, exists} ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, [Output|ExistingFiles])
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end;
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execute_template(Files, [{file, Input, Output} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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InputName = filename:join(filename:dirname(TemplateName), Input),
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File = load_file(Files, TemplateType, InputName),
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case write_file(Output, File, Force) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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{error, exists} ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, [Output|ExistingFiles])
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end;
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execute_template(Files, [{dir, Name} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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case filelib:ensure_dir(filename:join(Name, "dummy")) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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{error, Reason} ->
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?ABORT("Failed while processing template instruction "
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"{dir, ~s}: ~p\n", [Name, Reason])
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end;
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execute_template(Files, [{copy, Input, Output} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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InputName = filename:join(filename:dirname(TemplateName), Input),
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try rebar_file_utils:cp_r([InputName ++ "/*"], Output) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles)
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catch _:_ ->
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?ABORT("Failed while processing template instruction "
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"{copy, ~s, ~s}~n", [Input, Output])
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end;
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execute_template(Files, [{chmod, Mod, File} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles)
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when is_integer(Mod) ->
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case file:change_mode(File, Mod) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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{error, Reason} ->
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?ABORT("Failed while processing template instruction "
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"{chmod, ~b, ~s}: ~p~n", [Mod, File, Reason])
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end;
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execute_template(Files, [{symlink, Existing, New} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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case file:make_symlink(Existing, New) of
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ok ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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{error, Reason} ->
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?ABORT("Failed while processing template instruction "
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"{symlink, ~s, ~s}: ~p~n", [Existing, New, Reason])
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end;
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execute_template(Files, [{variables, _} | Rest], TemplateType,
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TemplateName, Context, Force, ExistingFiles) ->
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execute_template(Files, Rest, TemplateType, TemplateName,
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Context, Force, ExistingFiles);
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execute_template(Files, [Other | Rest], TemplateType, TemplateName,
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Context, Force, ExistingFiles) ->
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?WARN("Skipping unknown template instruction: ~p\n", [Other]),
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execute_template(Files, Rest, TemplateType, TemplateName, Context,
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Force, ExistingFiles).
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