oh-my-pi's ast_grep and ast_edit tools for the DeepSeek Harness (DSH): structural code search and structural rewrites that are previewed before they are applied. Both are backed by ast-grep (tree-sitter grammars for JS/TS/TSX, Python, Go, Rust, Java, C/C++, C#, Kotlin, Swift, Ruby, PHP, Lua, Bash, HTML, CSS, JSON, YAML, …).

Tools

`ast_grep`

Field	Description
`pat` (required)	One AST pattern, e.g. `console.log($$$ARGS)`, `def $F($$$): $$$BODY`
`path`	File, directory or glob; several separated by `;` (default: session workspace)
`lang`	Language override (`ts`, `tsx`, `python`, `cpp`, …)
`globs`	Include/exclude globs (`!` prefix excludes)
`selector`	AST kind to select inside the pattern (advanced)
`skip`	Paging offset

Pattern grammar:

$NAME captures one node; $$$NAME captures zero or more nodes.
$_ and $$$ match without binding.
Names are UPPERCASE and stand for whole nodes.

Output is grouped per file as LINE:TEXT, with the captured metavariables:

2 matches in 1 file
src/a.js
2:  console.log(x)
  ↳ $$$ARGS=[x]
3:  console.log(x, 2)
  ↳ $$$ARGS=[x, 2]

`ast_edit`

Preview: {ops: [{pat, out}, …], paths: [...]}.
- Captures from pat are substituted into out; an empty out deletes the node.
- Ops run in order, and each sees the result of the previous one.
- The call returns a diff preview and a proposal id. No file is modified.
Apply: {apply: "<id>"} writes the proposal. It's refused if any file changed since the preview.
Discard: {reject: "<id>"} drops the proposal.

Applied writes go through DSH's filesystem service (sandbox policy, observation tracking), and the Web UI shows a diff card. Proposals expire after proposalTtlMinutes.

Requirements

npm i -g @ast-grep/cli            # or: npm i -g --prefix ~/.local @ast-grep/cli

The plugin looks for the ast-grep binary on PATH and in ~/.local/bin. It ignores sg, which collides with util-linux on many distros.

Installation

dsh plugin --profile web add git+https://git.rizzy.dev/DSH-Plugins/omp-ast.git

Or in the Web UI, go to Settings → Plugins → Install and paste the same URL. For development, clone the repo and run dsh plugin --profile web add link:/path/to/omp-ast. Restart DSH afterwards (systemctl --user restart dsh).

Configuration

- id: omp-ast
  config:
    maxMatches: 200          # ast_grep page size
    maxFiles: 1000           # ast_edit safety cap
    proposalTtlMinutes: 30

Tests

npm test runs 4 tests against the real ast-grep CLI and DSH's fs backend.