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If you are seeking for an OCaml debugger vscode extension. Take a look at ocamlearlybird.

Deprecated. Please use this official extension instead.

Features

  • Basic syntax highlighting for *.ml, *.mli, *.mly and *.mll. ported from textmate
  • Auto-completion (aka. IntelliSense). powered by ocamlmerlin
  • Error check on the fly (aka. Lint). powered by ocamlmerlin
  • Show type information on hover. powered by ocamlmerlin
  • Peek and goto definition (also provide a symbol list). powered by ocamlmerlin
  • Auto indent on your type. powered by ocp-indent
  • Debugger integrated. powered by ocamldebug
  • UTop integrated. since v0.6.2

features

debugger

Requirements

opam install merlin
opam install ocp-indent

Extension Settings

This extension contributes the following settings:

  • ocaml.ocpIndentPath: Path to ocp-indent.
  • ocaml.merlinPath: Path to ocamlmerlin.
  • ocaml.replPath.windows or ocaml.replPath.unix: Path to ocaml REPL, eg "ocaml.exe", "utop".
  • ocaml.lintDelay: Time to delay lint when made changes.
  • ocaml.lintOnChange: Do lint when made changes.
  • ocaml.lintOnSave: Do lint when save document.

Tips

1). In VS Code, *.ml is associated to F# by default, You need manually config this in settings.json to make OCaml mode work with *.ml file.

	"files.associations": {
		"*.ml": "ocaml",
		"*.mli": "ocaml"
	}

2). You need build with -bin-annot flag and set build folder in .merlin to get goto definitions works cross files.

3). Did you know vscode-ocaml works perfect with .vscode/tasks.json. Here is an example:

# Makefile
build:
	ocamlbuild -use-ocamlfind main.d.byte
clean:
	ocamlbuild -clean
.PHONY: build clean
// .vscode/tasks.json
{
	"version": "0.1.0",
	"command": "make",
	"showOutput": "always",
	"tasks": [{
		"taskName": "clean"
	}, {
		"taskName": "build",
		"problemMatcher": "$ocamlc"
	}]
}
// .vscode/launch.json
{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "OCaml",
            "type": "ocamldebug",
            "request": "launch",
            "program": "${workspaceRoot}/main.d.byte",
            "stopOnEntry": false,
            "preLaunchTask": "build" // Build before launch
        }
    ]
}

Known Issues

See https://github.com/hackwaly/vscode-ocaml/issues?q=is%3Aopen+is%3Aissue+label%3Abug

Release Notes

0.6.0

Support launch debug target in Integrated Terminal. Add a command to switch between module implementation/signature. Support Find references in file. UTop integrated. Add opam switch command. More Info

0.5.0

Support debug variable paging. Support highlight occurrences and refactor in file. More Info

0.4.0

Add Windows debug support. Add remote debug support.

0.3.0

Add keywords completion. Add Menhir syntax over OCamlyacc syntax.

0.2.0

Add debugger (ocamldebug) support.

0.1.0

First published version.