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Add new license and start to do something useful.

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Added also few notes and tests. That's still a draft and it should not be used...
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2023-08-02 16:02:20 +00:00
committed by niamtokik
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200
LICENSE.md
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@@ -1,186 +1,20 @@
# Apache License
Version 2.0, January 2004
Copyright 2023 Mathieu Kerjouan
http://www.apache.org/licenses/
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
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END OF TERMS AND CONDITIONS
Copyright 2023, Mathieu Kerjouan <contact@steepath.eu>.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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132
README.md
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@@ -1,7 +1,15 @@
# gabarit
![GitHub top language](https://img.shields.io/github/languages/top/erlang-punch/gabarit)
![GitHub last commit (branch)](https://img.shields.io/github/last-commit/erlang-punch/gabarit/master)
![GitHub contributors](https://img.shields.io/github/contributors/erlang-punch/gabarit)
![GitHub all releases](https://img.shields.io/github/downloads/erlang-punch/gabarit/total)
![GitHub repo size](https://img.shields.io/github/repo-size/erlang-punch/gabarit)
Gabarit, a template engine manager for Erlang/OTP.
**!!!This is a draft, please don't use it in production!!!**
Gabarit was created to offer an easy way to deal with template engines
from the Erlang community but also to deal with multi-template engines
running on the same cluster.
@@ -15,8 +23,8 @@ templates using merl.
## Features
- [ ] templates versionned during compilation
- [ ] templates compiled with timestamp
- [x] templates versionned during compilation
- [x] templates compiled with timestamp
- [ ] hardcoded templates limits
- [ ] templates compilation limit during runtime
- [ ] automatic or dynamic reload
@@ -24,6 +32,9 @@ templates using merl.
- [ ] rollback template based on version
- [ ] export feature
- [ ] template edition facility (text editor integration)
- [ ] namespace support
- [ ] default value and options based on namespace
- [ ] partial templating
- [ ] project manager support
- [ ] rebar3 plugin
- [ ] erlang.mk plugin
@@ -150,8 +161,121 @@ gabarit:render("path", #{}, []).
gabarit:edit("path").
```
## Limitations
## Ideas
This project is side project created to play and improve template
management on Erlang/OTP system. Here list of ideas we would like to
work on.
### In Memory Compressed Templates
Templates can be really huge, and compressing them can save lot of
place, even more if they are using in a loaded module in the BEAM.
### Limitations
Erlang modules are compiled using atoms, atoms are limited and not
garbage collected. That means it could crash a production system if
you want to dynamically
you want to dynamically.
### Partial Templates
Sometimes, only a small part of the template needs to be dynamic, the
other part will stay static. Partial template will create a partial
template module with already replaced values in it.
### Development Environment
In development environment, templates can easily be upgraded and
updated on the fly, with local version. When one or more templates are
validated by developers, they can be exported with a fixed version.
### Production Environment
In production environment, templates are locked and can't be updated
on the fly, except during an explicit update/upgrade of the
application.
### Distributed Templates
In distributed environment, templates must be available on each nodes
requiring this module, even if the distribution does not have access
to them locally. We should probably also provide a RPC function.
### Custom Template Engine
A custom template engine with an AST representation and many way to
modify them, but without logic in it (avoid using if, for, while
expression). It should be developed in pure Erlang.
### Structured and Unstructured Template Engine Support
It could be great to support both structured and unstructured template
engines to generate, for example, XML, HTML, JSON but also Mardown and
raw textual files.
### What About Binary Template Engine?
We are used to use textual templates, but rarely binary templates. In
fact, having binary template could be an extension of pattern matching
in Erlang, when one specific binary pattern can be replaced, extended,
removed on some part in data. I don't think it should be part of this
project, but could be a great idea to implement. What kind of usage?
Network package payload modification on the fly, data fuzzing and so
on. Here a code example of what I have in mind:
```erlang
% A mapping is a document containing address on a binary map with
% default instructions when the pattern needs to be changed.
Identifier = "identifier".
Mapping = [{Identifier, {From, To}}
,{Identifier2, {From, {absolute, To}}, Opts2}
,{Identifier3, {From, {relative, To}}, Opts3}
,{Identifier4, {From, To}, [reversed]}
% set an elf_magic identifier to replace the magic
% number used by an executable binary file using
% ELF. It will be a fixed size.
,{"elf_magic", {16#00, 16#05}, [fixed]}
].
{ok, Cat} = file:read_file("/bin/cat").
{ok, Module} = gabarit_binary:compile(Cat, Mapping).
% returns the data
Module:data().
Module:analyze().
Module:analyze(fun(X) ->
% print the default mapping used for this file
Module:mapping().
% replace a pattern by a term
Module:replace(Identifier, Term).
% delete a pattern and resize the payload
Module:delete(Identifier).
% nullify a pattern (replace by 0x00).
Module:nullify(Identifier).
% randomize a pattern (replace with random payload)
Module:randomize(Identifier).
% clone a module with new identifier and/or already
% replaced values
Module:clone([{Identifier, {replace, Term, Opts}}]
,[{"newid", {From, To}, Opts}]).
% manual replacement
% {replace, {From, To}, Term, Opts}
% {nullify, {From, To}, Opts}
% {delete, {From, To}, Opts}
% {randomize, {From, To}, Opts}
Module:apply(Command, Opts).
Module:apply([Command, Command], Opts).
% some function to apply on the loaded payload
Module:map(fun(Integer) -> Integer end, Size).
Module:reduce(fun(Integer, BinAcc) -> <<Integer, BinAcc/binary>> end, Size).
```

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src/gabarit.erl
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@@ -1 +1,67 @@
%%%===================================================================
%%% @doc
%%% @end
%%%===================================================================
-module(gabarit).
-export([new/1]).
-export([template/1]).
-export([format/2, format/3]).
-export([render/2, render/3]).
%%--------------------------------------------------------------------
%% @doc Create a new template from file present in default template
%% path.
%%
%% == Example ==
%%
%% ```
%% {ok, Module} = gabaric:new("index.html").
%% '''
%%
%% @end
%%--------------------------------------------------------------------
-spec new(Filename) -> Return when
Filename :: string() | binary(),
Return :: {ok, Module},
Module :: atom().
new(Filename) ->
Template = gabarit_compiler:template_file(Filename),
gabarit_compiler:compile_file(Template).
%%--------------------------------------------------------------------
%% @doc
%% @end
%%--------------------------------------------------------------------
template(Filename) ->
ModuleName = gabarit_compiler:find_template_file_module(Filename),
ModuleName:template().
%%--------------------------------------------------------------------
%% @doc
%% @end
%%--------------------------------------------------------------------
format(Filename, Context) ->
format(Filename, Context, []).
%%--------------------------------------------------------------------
%% @doc
%% @end
%%--------------------------------------------------------------------
format(Filename, Context, Opts) ->
ModuleName = gabarit_compiler:find_template_file_module(Filename),
ModuleName:format(Context, Opts).
%%--------------------------------------------------------------------
%% @doc
%% @end
%%--------------------------------------------------------------------
render(Filename, Context) ->
render(Filename, Context, []).
%%--------------------------------------------------------------------
%% @doc
%% @end
%%--------------------------------------------------------------------
render(Filename, Context, Opts) ->
ModuleName = gabarit_compiler:find_template_file_module(Filename),
ModuleName:render(Context, Opts).

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src/gabarit_compiler.erl
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@@ -1,26 +1,47 @@
%%%===================================================================
%%% @doc
%%% @doc private interface module.
%%% @end
%%%===================================================================
-module(gabarit_compiler).
-compile(export_all).
-export([path/0, tree/0, tree/1]).
-define(DEFAULT_PATH, "priv/templates").
-define(DEFAULT_PREFIX_FILE, "gabarit@").
-define(DEFAULT_PREFIX_STRING, "gabarit$").
-define(DEFAULT_MERL_TEMPLATE, "priv/gabarit/gabarit_template.erl").
%%--------------------------------------------------------------------
%% @doc compile
%% @end
%%--------------------------------------------------------------------
compile_file(#{ name := Identifier } = Struct) ->
ModuleName = create_module_name(?DEFAULT_PREFIX_FILE, Identifier),
NewStruct = Struct#{ module_name => ModuleName },
case merl_compile_and_load(NewStruct) of
{ok, _} ->
{ok, ModuleName};
Elsewise -> Elsewise
end.
%%--------------------------------------------------------------------
%%
%%--------------------------------------------------------------------
compile(#{ name := Identifier } = Struct) ->
ModuleName = create_module_name("gabarit@", Identifier),
compile_string(#{ name := Identifier } = Struct) ->
ModuleName = create_module_name(?DEFAULT_PREFIX_STRING, Identifier),
merl_compile_and_load(Struct#{ module_name => ModuleName }).
%%--------------------------------------------------------------------
%%
%%--------------------------------------------------------------------
compile(Struct) when is_map(Struct) ->
merl_compile_and_load(Struct).
%%--------------------------------------------------------------------
%%
%%--------------------------------------------------------------------
find_and_compile() ->
Tree = tree(),
lists:map(fun compile/1, Tree).
lists:map(fun compile_file/1, Tree).
%%--------------------------------------------------------------------
%%
@@ -42,6 +63,17 @@ create_module_name(Prefix, Identifier) ->
_:_ -> erlang:list_to_atom(ModuleName)
end.
%%--------------------------------------------------------------------
%%
%%--------------------------------------------------------------------
find_template_file_module(Identifier) ->
ModuleName = string:concat(?DEFAULT_PREFIX_FILE, Identifier),
try
erlang:list_to_existing_atom(ModuleName)
catch
_:_ -> throw({error, ModuleName})
end.
%%--------------------------------------------------------------------
%% @doc list the current path used to load the templates.
%% @end
@@ -61,17 +93,17 @@ tree() ->
%% @doc
%% @end
%%--------------------------------------------------------------------
tree(Path) -> tree(Path, []).
tree(Path) -> tree(Path, [], Path).
%%--------------------------------------------------------------------
%% @hidden
%% @doc
%% @end
%%--------------------------------------------------------------------
tree(Path, Buffer) ->
tree(Path, Buffer, Root) ->
case file:list_dir(Path) of
{ok, Files} ->
tree(Path, Files, Buffer);
tree(Path, Files, Buffer, Root);
{error, Error} ->
throw({error, Error})
end.
@@ -81,36 +113,89 @@ tree(Path, Buffer) ->
%% @doc
%% @end
%%--------------------------------------------------------------------
tree(_, [], Buffer) -> Buffer;
tree(Path, [File|Files], Buffer) ->
tree(_, [], Buffer, Root) -> Buffer;
tree(Path, [File|Files], Buffer, Root) ->
FilePath = filename:join([Path, File]),
case filelib:is_dir(FilePath) of
true -> tree(FilePath, Buffer);
false -> tree(Path, Files, [{Path, FilePath}|Buffer])
true ->
tree(FilePath, Buffer, Root);
false ->
F = filename:split(FilePath),
R = filename:split(Root),
S = lists:subtract(F, R),
RelativePath = filename:join(S),
tree(Path, Files, [{Path, FilePath, RelativePath}|Buffer], Root)
end.
%%--------------------------------------------------------------------
%% @hidden
%% @doc paths filtering.
%% @see template_file/2
%% @end
%%--------------------------------------------------------------------
tree_filter({Key, Value}, Acc) ->
Origin = filename:split(Key),
Root = filename:split(path()),
Filename = lists:last(filename:split(Value)),
AbsolutePath = filename:absname(Value),
Subtract = lists:subtract(Origin, Root),
Identifier = case Subtract of
[] -> filename:join(["/", Filename]);
_ -> filename:join(["/", Subtract, Filename])
end,
{ok, Content} = file:read_file(AbsolutePath),
[#{ name => Identifier
-spec tree_filter({TemplatePath, TemplateFile, RelativePath}, Acc) -> Return when
TemplatePath :: string(),
TemplateFile :: string(),
RelativePath :: string(),
Acc :: [string(), ...],
Return :: Acc.
tree_filter({TemplatePath, _TemplateFile, RelativePath}, Acc) ->
Return = template_file(TemplatePath, RelativePath),
[Return|Acc].
%%--------------------------------------------------------------------
%%
%%--------------------------------------------------------------------
template_file(Filename) ->
TemplatePath = path(),
template_file(TemplatePath, Filename).
%%--------------------------------------------------------------------
%% @hidden
%% @doc this function takes the default path where the file should be
%% stored and the filename present in this path. If everything is fine,
%% it will output a map containing all information required to use
%% the file as template.
%% @end
%%--------------------------------------------------------------------
-spec template_file(TemplatePath, TemplateFile) -> Return when
TemplatePath :: string(),
TemplateFile :: string(),
Return :: map().
template_file(TemplatePath, TemplateFile) ->
case filelib:safe_relative_path(TemplateFile, TemplatePath) of
unsafe -> {error, unsafe};
SafeFile ->
SafePath = filename:join(path(), SafeFile),
AbsolutePath = filename:absname(SafePath),
Filename = filename:basename(SafePath),
Identifier = template_file_identifier(TemplatePath, Filename),
case file:read_file(SafePath) of
{ok, Content} ->
#{ name => Identifier
, filename => Filename
, absolute_path => AbsolutePath
, relative_path => Key
, relative_path => TemplatePath
, template => Content
}|Acc].
};
{error, Error} ->
throw(Error)
end
end.
%%--------------------------------------------------------------------
%% create a file identifier based on default path
%%--------------------------------------------------------------------
template_file_identifier(TemplatePath, Filename) ->
Origin = filename:split(TemplatePath),
Root = filename:split(path()),
Subtract = lists:subtract(Origin, Root),
template_file_identifier2(Filename, Subtract).
template_file_identifier2(Filename, []) ->
filename:join(["/", Filename]);
template_file_identifier2(Filename, Subtract) ->
filename:join(["/", Subtract, Filename]).
%%--------------------------------------------------------------------
%% @hidden

19
src/gabarit_module.erl Normal file
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@@ -0,0 +1,19 @@
-module(gabarit_module).
-compile(export_all).
-define(DEFAULT_PREFIX_FILE, "gabarit@").
-define(DEFAULT_PREFIX_STRING, "gabarit$").
name(Prefix, Identifier) ->
ModuleName = string:concat(Prefix, Identifier),
try
{ok, erlang:list_to_existing_atom(ModuleName)}
catch
_:_ -> erlang:list_to_atom(ModuleName)
end.
exist(Name) ->
try
_Module = erlang:list_to_existing_atom(Name)
catch
_:_ -> false
end.

19
src/gabarit_store.erl Normal file
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@@ -0,0 +1,19 @@
%%%===================================================================
%%%
%%%===================================================================
-module(gabarit_store).
-behavior(gen_statem).
-compile(export_all).
-record(state, { store :: reference() }).
callback_mode() -> state_functions.
init(_Args) ->
Ets = ets:new(?MODULE, [private]),
{ok, unlocked, #state{ store = Ets }}.
unlocked(_,_,Data) ->
{keep_state, Data}.
locked(_,_,Data) ->
{keep_state, Data}.

1
test/fixtures/mustache_templates/index.html vendored Normal file
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@@ -0,0 +1 @@
<body>{{content}}</body>

130
test/gabarit_SUITE.erl Normal file
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@@ -0,0 +1,130 @@
%%%-------------------------------------------------------------------
%%% @author <user@disp3269>
%%% @copyright (C) 2023,
%%% @doc
%%%
%%% @end
%%% Created : 1 Aug 2023 by <user@disp3269>
%%%-------------------------------------------------------------------
-module(gabarit_SUITE).
-compile(export_all).
-include_lib("common_test/include/ct.hrl").
%%--------------------------------------------------------------------
%% @spec suite() -> Info
%% Info = [tuple()]
%% @end
%%--------------------------------------------------------------------
suite() ->
[{timetrap,{seconds,30}}].
%%--------------------------------------------------------------------
%% @spec init_per_suite(Config0) ->
%% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1}
%% Config0 = Config1 = [tuple()]
%% Reason = term()
%% @end
%%--------------------------------------------------------------------
init_per_suite(Config) ->
application:set_env(gabarit, templates_path, "../../fixtures/mustache_templates/"),
Config.
%%--------------------------------------------------------------------
%% @spec end_per_suite(Config0) -> term() | {save_config,Config1}
%% Config0 = Config1 = [tuple()]
%% @end
%%--------------------------------------------------------------------
end_per_suite(_Config) ->
ok.
%%--------------------------------------------------------------------
%% @spec init_per_group(GroupName, Config0) ->
%% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1}
%% GroupName = atom()
%% Config0 = Config1 = [tuple()]
%% Reason = term()
%% @end
%%--------------------------------------------------------------------
init_per_group(_GroupName, Config) ->
Config.
%%--------------------------------------------------------------------
%% @spec end_per_group(GroupName, Config0) ->
%% term() | {save_config,Config1}
%% GroupName = atom()
%% Config0 = Config1 = [tuple()]
%% @end
%%--------------------------------------------------------------------
end_per_group(_GroupName, _Config) ->
ok.
%%--------------------------------------------------------------------
%% @spec init_per_testcase(TestCase, Config0) ->
%% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1}
%% TestCase = atom()
%% Config0 = Config1 = [tuple()]
%% Reason = term()
%% @end
%%--------------------------------------------------------------------
init_per_testcase(_TestCase, Config) ->
Config.
%%--------------------------------------------------------------------
%% @spec end_per_testcase(TestCase, Config0) ->
%% term() | {save_config,Config1} | {fail,Reason}
%% TestCase = atom()
%% Config0 = Config1 = [tuple()]
%% Reason = term()
%% @end
%%--------------------------------------------------------------------
end_per_testcase(_TestCase, _Config) ->
ok.
%%--------------------------------------------------------------------
%% @spec groups() -> [Group]
%% Group = {GroupName,Properties,GroupsAndTestCases}
%% GroupName = atom()
%% Properties = [parallel | sequence | Shuffle | {RepeatType,N}]
%% GroupsAndTestCases = [Group | {group,GroupName} | TestCase]
%% TestCase = atom()
%% Shuffle = shuffle | {shuffle,{integer(),integer(),integer()}}
%% RepeatType = repeat | repeat_until_all_ok | repeat_until_all_fail |
%% repeat_until_any_ok | repeat_until_any_fail
%% N = integer() | forever
%% @end
%%--------------------------------------------------------------------
groups() ->
[].
%%--------------------------------------------------------------------
%% @spec all() -> GroupsAndTestCases | {skip,Reason}
%% GroupsAndTestCases = [{group,GroupName} | TestCase]
%% GroupName = atom()
%% TestCase = atom()
%% Reason = term()
%% @end
%%--------------------------------------------------------------------
all() ->
[common].
%%--------------------------------------------------------------------
%% @spec TestCase() -> Info
%% Info = [tuple()]
%% @end
%%--------------------------------------------------------------------
common() ->
[].
%%--------------------------------------------------------------------
%% @spec TestCase(Config0) ->
%% ok | exit() | {skip,Reason} | {comment,Comment} |
%% {save_config,Config1} | {skip_and_save,Reason,Config1}
%% Config0 = Config1 = [tuple()]
%% Reason = term()
%% Comment = term()
%% @end
%%--------------------------------------------------------------------
common(_Config) ->
{ok, Module} = gabarit:new("index.html").