Improve PPX template

template/ppx/template/CONTRIBUTING.md

@@ -0,0 +1,79 @@
+# Contributing
+
+## Setup your development environment
+
+You need Opam, you can install it by following [Opam's documentation](https://opam.ocaml.org/doc/Install.html).
+
+With Opam installed, you can install the dependencies in a new local switch with:
+
+```bash
+make switch
+```
+
+Or globally, with:
+
+```bash
+make deps
+```
+
+Then, build the project with:
+
+```bash
+make build
+```
+
+### Running the PPX
+
+After building the project, you can run the main binary on an OCaml source file to see what the PPX is doing.
+
+```bash
+opam exec -- dune exec bin/main.exe test/{{ project_snake }}_test.ml
+```
+
+### Running Tests
+
+You can run the test compiled executable:
+
+```bash
+make test
+```
+
+### Building documentation
+
+Documentation for the libraries in the project can be generated with:
+
+```bash
+make doc
+make servedoc
+```
+
+### Repository Structure
+
+The following snippet describes {{ project_name }}'s repository structure.
+
+```text
+.
+├── bin/
+|   Source for {{ project_slug }}'s binaries. This links to the rewriter defined in `lib/`.
+│
+├── lib/
+|   Source for {{ project_name }}'s library. Contains {{ project_name }}'s rewriting functionalities.
+│
+├── test/
+|   Unit tests and integration tests for {{ project_name }}.
+│
+├── dune-project
+|   Dune file used to mark the root of the project and define project-wide parameters.
+|   For the documentation of the syntax, see https://dune.readthedocs.io/en/stable/dune-files.html#dune-project
+│
+├── LICENSE
+│
+├── Makefile
+|   Make file containing common development command.
+│
+├── README.md
+│
+└── {{ project_slug }}.opam
+    Opam package definition.
+    To know more about creating and publishing opam packages, see https://opam.ocaml.org/doc/Packaging.html.
+```

template/ppx/template/bin/dune

@@ -1,4 +1,4 @@
 (executable
  (name main)
  (public_name {{ project_slug }})
- (libraries {{ project_snake }} cmdliner fmt fmt.tty logs.fmt logs.cli))
+ (libraries {{ project_snake }}))

template/ppx/template/bin/main.ml

@@ -1,3 +1,3 @@
 open Ppxlib
 
-let _ = Driver.run_as_ppx_rewriter ()
+let _ = Driver.standalone ()

template/ppx/template/test/{{ project_snake }}_test.mli

@@ -0,0 +1,3 @@
+open Ppxlib
+
+let _ = Driver.standalone ()