The extension is available on both vsce, and on ovsx.

This VSCode extension is a fork of the GitHub project sublime_autotools. It includes syntax highlighting for Autoconf M4 (.m4, configure.ac...) and Automake files (e.g., Makefile.am). This extension uses the vscode's own Makefile syntax support for hghlighting makefile things in automake files. I chose to fork the sublime project in order to have an easy way of updating vscode_autotools (which is only a matter of git merge).

Note that the sublime fork also has a Makefile2 (an alternate grammar file for Makefiles) but the standard vscode's Makefile support works much better (actually, the sublime's one is kind of buggy).

The changes to vscode_autotools are documented in CHANGELOG.md.

See DEVELOPMENT.md for more information on how to debug and improve vscode_autotools.

Note: For Autoconf M4 macros, the arguments may need to be highlighted in several different ways; some are shell code, some are plain text, and a few are C code. There are definitions for the builtin ones, but custom macros may not be highlighted correctly.