Up and running with OCaml

site/index.md

@@ -7,7 +7,7 @@
             <h1 class="span9">OCaml is an industrial strength programming language supporting functional, imperative and object-oriented styles</h1>
             <div class="span3">
                 <div>
-                    <a class="btn" href="/docs/install.html">Install OCaml</a>
+                    <a class="btn" href="/learn/tutorials/up_and_running.html">Install OCaml</a>
                 </div>
             </div>
         </div>

site/learn/index.fr.md

@@ -31,6 +31,7 @@ OCaml est un langage générique de programmation, de puissance industrielle, qu
         <section class="span4 condensed">
             <h1 class="ruled"><a href="tutorials/">Tutoriaux</a> &amp; <a href="faq.html">FAQ</a></h1>
             <ul>
+                <li><a href="tutorials/up_and_running.html">Opérationnel avec OCaml</a></li>
                 <li><a href="tutorials/basics.fr.html">Les bases syntaxiques</a></li>
                 <li><a href="tutorials/structure_of_ocaml_programs.fr.html">Les constructions de base</a></li>
                 <li><a href="tutorials/modules.fr.html">Les modules</a></li>

site/learn/index.md

@@ -37,6 +37,7 @@
         <section class="span4 condensed">
             <h1 class="ruled"><a href="tutorials/">Tutorials</a> &amp; <a href="faq.html">FAQ</a></h1>
             <ul>
+                <li><a href="tutorials/up_and_running.html">Up and Running</a></li>
                 <li><a href="tutorials/basics.html">Basics</a></li>
                 <li><a href="tutorials/structure_of_ocaml_programs.html">Structure of OCaml Programs</a></li>
                 <li><a href="tutorials/modules.html">Modules</a></li>

site/learn/tutorials/index.de.md

@@ -7,6 +7,7 @@
 
 ((! get begin_two_columns !))
 
+* [Mit OCaml in Betrieb](up_and_running.html)
 * [Die Grundlagen](basics.de.html) Sollten Sie ein Anfänger in OCaml oder
 funktionaler Programmierung sein, lesen Sie bitte dieses Kapitel
 zuerst.

site/learn/tutorials/index.fr.md

@@ -5,6 +5,7 @@
 
 ((! get begin_two_columns !))
 
+* [Opérationnel avec OCaml](up_and_running.html)
 * [Notions de base](basics.fr.html)
   — Si vous débutez OCaml ou la programmation fonctionnelle, lisez
   ceci d'abord.

site/learn/tutorials/index.it.md

@@ -5,6 +5,7 @@
 
 ((! get begin_two_columns !))
 
+* [Funzionante con OCaml](up_and_running.html)
 * [Le basi](basics.it.html) — Se sei nuovo di OCaml o della
   programmazione funzionale, leggi questo per primo.
 * [La struttura dei programmi OCaml](structure_of_ocaml_programs.it.html)

site/learn/tutorials/index.ja.md

@@ -11,6 +11,7 @@
 
 ### はじめに
 
+* [Up and Running](up_and_running.html)
 * [はじめの一歩](basics.ja.html) — 基本中の基本
 * [OCamlプログラムの構造](structure_of_ocaml_programs.ja.html)
 * [モジュール](modules.ja.html)

site/learn/tutorials/index.ko.md

@@ -9,6 +9,7 @@
 
 ((! get begin_two_columns !))
 
+* [Up and Running](up_and_running.html)
 * [기본사항](basics.ko.html) 
 * [OCaml 프로그램의 구조](structure_of_ocaml_programs.ko.html)
 * 모듈(Modules) - [en](modules.html)

site/learn/tutorials/index.md

@@ -13,6 +13,7 @@ tracker there to request or offer new tutorials. Thanks!
 
 ### Getting Started
 
+* [Up and Running](up_and_running.html)
 * [Basics](basics.html)
 * [Structure of OCaml Programs](structure_of_ocaml_programs.html)
 * [Modules](modules.html)

site/learn/tutorials/index.zh.md

@@ -9,6 +9,7 @@ OCaml是一种快速、简洁、而强大的应用程序开发语言－－我想
 
 ((! get begin_two_columns !))
 
+* [Up and Running](up_and_running.html)
 * [基础](basics.zh.html) — 如果你是OCaml或函数式语言的初学者请先阅读本节。
 * [Ocaml程序的结构](structure_of_ocaml_programs.zh.html)
 * [模块](modules.zh.html)

site/learn/tutorials/up_and_running.md

@@ -0,0 +1,230 @@
+<!-- ((! set title Up and Running with OCaml !)) ((! set learn !)) -->
+
+*Table of contents*
+
+# Up and Running with OCaml
+
+This page will help you install OCaml, the Dune build system, and support for
+your favourite text editor or IDE. These instructions work on Windows, Unix
+systems like Linux, and MacOS.
+
+## Installing OCaml
+
+There are two procedures: one for Unix-like systems, and one for Windows.
+
+### For Linux and MacOS
+
+We will install OCaml using OPAM, the OCaml package manager.  OPAM will also be
+used when we wish to install third-party OCaml libraries.
+
+**For MacOS**
+
+```
+# Homebrew
+brew install gpatch
+brew install opam
+
+# MacPort
+port install opam
+```
+
+**For Linux** the preferred way is to use your system's package manager on
+Linux (e.g `apt-get install opam` or similar). [Details of all installation
+methods.](https://opam.ocaml.org/doc/Install.html)
+
+Then, we install an OCaml compiler:
+
+```
+# environment setup
+opam init
+eval `opam env`
+
+# install given version of the compiler
+opam switch create 4.11.1
+eval `opam env`
+```
+
+Now, OCaml is up and running:
+
+```
+$ which ocaml
+/Users/frank/.opam/4.11.1/bin/ocaml
+
+$ ocaml -version
+The OCaml toplevel, version 4.11.1
+```
+
+**For either Linux or MacOS** as an alternative, a binary distribution of OPAM is
+available:
+
+```
+sh <(curl -sL https://raw.githubusercontent.com/ocaml/opam/master/shell/install.sh)
+```
+
+### For Windows
+
+We use the [OCaml for Windows](https://fdopen.github.io/opam-repository-mingw/)
+installer which comes in 32bit and 64bit versions. This installer gives you
+OPAM and OCaml installations all in one go. It is used from within a Cygwin
+environment, but the executables produced have no dependency on Cygwin at all.
+
+## The OCaml top level
+
+OCaml comes with two compilers: for native code, and for byte code. We shall
+use one of those in a moment. But first, let's use OCaml's top level (sometimes
+known as a REPL in other languages):
+
+```
+$ ocaml
+        OCaml version 4.11.1
+
+# 1 + 2 * 3;;
+- : int = 7
+
+```
+
+We typed the phrase `1 + 2 * 3` and then signalled to OCaml that we had
+finished by typing `;;` followed by the Enter key. OCaml calculated the
+result, `7` and its type `int` and showed them to us. We exit by running the
+built-in `exit` function with exit code 0:
+
+```
+$ ocaml
+        OCaml version 4.11.1
+
+# 1 + 2 * 3;;
+- : int = 7
+# exit 0;;
+$
+```
+
+There are two ways to improve your experience with the OCaml top level: you can
+install the popular [`rlwrap`](https://github.com/hanslub42/rlwrap) on your
+system and invoke `rlwrap ocaml` instead of `ocaml` to get line-editing
+facilities inside the OCaml top level, or you can install the alternative top
+level `utop` using OPAM:
+
+```
+$ opam install utop
+```
+
+We run it by typing `utop` instead of `ocaml`. You can read more about
+[utop](https://github.com/ocaml-community/utop).
+
+## Installing the Dune build system
+
+Dune is a build system for OCaml. It takes care of all the low level details of
+OCaml compilation. We install it with OPAM:
+
+```
+$ opam install dune
+The following actions will be performed:
+  - install dune 2.7.1
+
+<><> Gathering sources ><><><><><><><><><><><><><><><><><><><><><><><><>
+[default] https://opam.ocaml.org/2.0.7/archives/dune.2.7.1+opam.tar.gz
+downloaded
+
+<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><>
+-> installed dune.2.7.1
+Done.
+```
+
+## A first project
+
+Let's begin the simplest project with Dune and OCaml. We create a new directory
+and ask `dune` to initialise a new project:
+
+```
+$ mkdir helloworld
+$ cd helloworld/
+$ dune init exe helloworld
+Success: initialized executable component named helloworld
+```
+
+Building our program is as simple as typing `dune build`:
+
+```
+$ dune build
+Info: Creating file dune-project with this contents:
+| (lang dune 2.7)
+Done: 8/11 (jobs: 1)
+```
+
+When we change our program, we type `dune build` again to make a new
+executable. We can run the executable with `dune exec` (it's called
+`helloworld.exe` even when we're not using Windows):
+
+```
+$ dune exec ./helloworld.exe
+Hello, World!        
+```
+
+Let's look at the contents of our new directory. Dune has added the
+`helloworld.ml` file, which is our OCaml program. It has also added our `dune`
+file, which tells dune how to build the program, and a `_build` subdirectory,
+which is dune's working space.
+
+```
+$ ls
+_build		dune		helloworld.ml
+```
+
+The `helloworld.exe` executable is stored inside the `_build` structure, so
+it's easier to run with `dune exec`. To ship the executable, we can just copy
+it from inside `_build` to somewhere else.
+
+Here is the contents of the automatically-generated `dune` file. When we want
+to add components to your project, such as third-party libraries, we edit this
+file.
+
+```
+(executable
+ (name helloworld))
+```
+
+## Editor support for OCaml
+
+For **Visual Studio Code**, and other editors support the Language Server
+Protocol, the OCaml language server can by installed with OPAM:
+
+```
+$ opam pin add ocaml-lsp-server https://github.com/ocaml/ocaml-lsp.git
+$ opam install ocaml-lsp-server
+```
+
+Now, we install the OCaml Platform Visual Studio Code extension from the Visual
+Studio Marketplace.
+
+Upon first loading an OCaml source file, you may be prompted to select the
+toolchain in use: pick OCaml the version of OCaml you are using, e.g. 4.11.1
+from the list. Now, help is available by hovering over symbols in your program:
+
+![Visual Studio Code](/img/vscode.png "")
+
+**On Windows**, we must launch Visual Studio Code from within the Cygwin window,
+rather than by clicking on its icon (otherwise, the language server will not be
+found):
+
+```
+$ /cygdrive/c/Users/Frank\ Smith/AppData/Local/Programs/Microsoft\ VS\ Code/Code.exe
+```
+
+**For Vim and Emacs**, install the [Merlin](https://github.com/ocaml/merlin)
+system using OPAM:
+
+```
+$ opam install merlin
+```
+
+The installation procedure will print instructions on how to link Merlin with
+your editor.
+
+**On Windows**, when using Vim, the default cygwin Vim will not work with
+Merlin. You will need install Vim separately. In addition to the usual
+instructions printed when installing Merlin, you may need to set the PATH in
+Vim:
+
+```
+let $PATH .= ";".substitute(system('opam config var bin'),'\n$','','''')
+```