The easiest way to initialize, compile, and run an Ocsigen/Eliom project is to use eliom-distillery.
eliom-distillery is self-documenting (refer to eliom-distillery -help and the generated README), but here is a bit information on how to work with it.
eliom-distillery creates projects from templates. To see all available templates, you can use
$ eliom-distillery -list-templates
Template "basic" create a very simple project (makefiles and configuration file and main service).
To create your project, do:
$ eliom-distillery -name <name> -template basic.ppx [-target-directory <dir>]
This creates a project named <name> from the "basic.ppx" template in the directory <dir> or <name> by default. The project name should be a valid name for an OCaml compilation unit. The project directory contains the following files
This is your initial source file. All Eliom files (*.eliom, *.eliomi) in this directory are automatically considered. To add a .ml/.mli file to your project, add it to the variable SERVER_FILES or CLIENT_FILES in Makefile.options.
The content of this folder is statically served. It contains initially a basic CSS file for your project.
Configure your project here!
This file is a template for the configuration file for ocsigenserver. You will rarely need to edit it: it can be personalized through variables in Makefile.options. In particular, this way, the installation rules and the configuration files remains coherent.
This contains all rules necessary to build, test, and run your Eliom application. You should avoid modifying it. See below for the relevant targets.
An explanation of how to compile, test, install, and run your application
Compilation & Running: Read the README
You can just run
$ make test.byte
$ make test.opt
to compile your project and run ocsigenserver with it.
Please refer to the generated README file for further hints on how to work with your project.
Using other templates
If you want to start from a more complete or more specific template, you can get other templates from the internet, such as "ocsigen-start". You can either install these templates into eliom's own directory (this is what their installer generally does), or, if doing so is not practical, you can use the ELIOM_DISTILLERY_PATH environment variable to point to your templates. This environment variable is a colon-separated list of absolute paths (that is, export ELIOM_DISTILLERY_PATH=/usr/lib/template1:/usr/local/lib/template2).
A template's name is its directory basename (template1 and template2 for the preceding example). If you want to create a new project based on template1, you can use
$ eliom-distillery -name example -template template1
Write other templates
You can also write your own templates and install them by using the previous described method.
By default, eliom-distillery copies all files in the template directory. If you want to ignore some files, you can list them in the special file .eliomignore.
For some templates, e.g., the one of Ocsigen Start, some project names are reserved to avoid conflicts. For a new template, you need to list all reserved project names in the special file .eliomreserve.
eliom-distillery also replaces %%%PROJECT_NAME%%% (resp. %%%MODULE_NAME%%%) by the project name (resp. by the project name with the first letter capitalized).
For examples, see pre-defined templates like basic.ppx and os.pgocaml.