Extension: Treemacs

This extension defines two new treemacs themes:

"doom-atom": an all-the-icons treemacs theme that mimics the minimal iconset of Atom's sidebar.
"doom-colors": an all-the-icons treemacs theme with unique, per-filetype icons, akin to VSCode's sidebar.

What both of these themes provide over the standard themes available with Treemacs (or treemacs-all-the-icons):

Uses icons + chevrons to complete the vscode/atom sidebar look.
Displays folder/file labels in variable-pitch (rather than a monospace font), which is easier to read and takes up less horizontal space.
Adds more settings for you to customize neotree with (to control line height, icon size, etc).

Requirements

This requires the [all-the-icons] package and its fonts to be installed.

Run M-x all-the-icons-install-fonts to install its fonts.

Once the doom-themes plugin is installed, you need only run doom-themes-neotree-config:

(with-eval-after-load 'doom-themes
  (doom-themes-treemacs-config))

Variables (use C-h v to look up documentation)
- doom-themes-treemacs-enable-variable-pitch (default: t)
- doom-themes-treemacs-variable-pitch-face (default: 'variable-pitch) what face to use for folder/icon labels. Change this to affect the font for labels.
- doom-themes-treemacs-line-spacing (default: 1)
- doom-themes-treemacs-theme (default: "doom-atom")
- doom-themes-treemacs-bitmap-indicator-width (default: 3)
These faces can be customized (use M-x describe-face for documentation):
- doom-themes-treemacs-root-face: face for folders
- doom-themes-treemacs-file-face: face for files