Pest mode provides a major mode for editing Pest files. It also contains a few advanced features.

Current stable version: 0.1.

Pest-mode features:

• Syntax highlighting
• Indentation
• Imenu integration
• xref integration
• Eldoc integration (requires pesta)
• Flymake/flycheck integration for syntax checking (requires pesta)
• Language studio, where you can experiment the grammar (requires pesta)

pest-mode, flymake-pest, and flycheck-pest are now on MELPA.

• Just M-x package-install both pest-mode and flymake-pest.
• Install pesta (see below).

To manually install pest-mode, download the file and put it in your load-path, and write in your config file:

(autoload 'pest-mode "pest-mode")
(add-to-list #'auto-mode-alist '("\\.pest\\'" . pest-mode))

If you use use-package and quelpa, life is easier:

(use-package pest-mode
  :quelpa (pest-mode :fetcher github :repo "ksqsf/pest-mode")
  :mode "\\.pest\\'"
  :hook (pest-mode . flymake-mode))

To use the more advanced features, you must have pesta installed.

pesta is now on crates.io, so just do

• cargo install pesta --force

Or, if you prefer the manual way,

1. Install the Rust toolchain.
2. cd pesta && cargo build --release
3. Find the executable pesta under target/release, and (optionally) put it in your PATH.

Note: you have to customize pest-pesta-executable if pesta is not in your PATH.

If you have added pest-mode to auto-mode-alist, then it should be enabled automatically on any .pest file.

In a .pest file,

• pest-test-input (default keybinding C-c C-t): open a buffer to test the current grammar
• flymake-mode: enable syntax checking

In a testing buffer,

• pest-select-rule (default keybinding C-c C-r): select the start rule for all other purposes
• pest-analyze-input (default keybinding C-c C-c): analyze the input and report the structure
• flymake-mode (enabled by default): enable syntax checking
• eldoc-mode (enabled by default): enable displaying the parse tree path

All of the following require pesta.