module-graph

The module-graph tool generates a graph of dependencies between OCaml modules using compiled object files. module-graph scans the current directory and sub-directories looking for .cmt/.cmti/.cmi files, creates a memory graph of dependencies between them, and uses dot to display the graph into a pdf/image file.

See examples of generated graphs at the end of this file.

Installation

The module-graph binary should be built with the same version of OCaml as the project you want to analyze with it.

The recommended way to install it is, within your project opam switch:

opam pin git+https://github.com/OCamlPro/module-graph

This command should ask you confirmation to create the packages contained in the module-graph project, and then install it in the switch.

You will also need to have dot installed on your computer: on Debian/Ubuntu systems, it is part of the graphviz package.

Usage

In your project, just run:

$ module-graph
Generated 23 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

By default, module-graph scans the current directory and its sub-directories, looking for .cmt/.cmti files. It only ignores the _opam/ sub-directory.

You can specify another set of directories to scan:

$ module-graph _build/default/src/parsers
Generated 6 edges in "deps.dot" and "deps.pdf"

You can change the format of the generated file with -T/--format FORMAT:

$ module-graph --format png
Generated 23 edges in "deps.dot" and "deps.png"
$ display deps.png

You can change the name of the generated file with -o/--output BASENAME:

$ module-graph -o alt-ergo-deps
Generated 23 edges in "alt-ergo-deps.dot" and "alt-ergo-deps.pdf"
$ evince alt-ergo-deps.pdf

In some cases, .cmt/.cmti files are not available, so you may want to use .cmi files with --cmi:

$ module-graph --cmi
Generated 21 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

By default, module-graph drops direct links between modules if these links are implied by transitive dependencies. You can keep them with -A/--all-links:

$ module-graph --all-links
Generated 32 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

If modules are packed/wrapped within a module (default behavior for dune), you may use the -R/--remove-pack MODNAME to filter modules (keeping only the ones within the pack) and remove the corresponding prefix:

$ module-graph --remove-pack AltErgoLib
Generated 19 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

You can display the filenames in the grap instead of the module names using the --filenames option:

$ module-graph --filenames
Generated 23 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

You can filter out modules using a regexp with -X/--ignore-module REGEXP where regexp is in the glob format:

$ module-graph -X 'AltErgoLib__*'
Generated 3 edges in "deps.dot" and "deps.pdf"
$ evince deps.pdf

Examples

• Raw Dependencies for module-graph:

• All Dependencies for module-graph (--all-links):

• Raw Dependencies for alt-ergo:

• Dependencies restricted to AltErgoLib for alt-ergo (--remove-pack AltErgoLib):

Resources

• Website: https://ocamlpro.github.io/module-graph
• General Documentation: https://ocamlpro.github.io/module-graph/sphinx
• API Documentation: https://ocamlpro.github.io/module-graph/doc
• Sources: https://github.com/ocamlpro/module-graph