oxicode-hashline

Line-anchored patch format for AI-assisted code editing.

oxicode-hashline is a pure-function library that parses and applies a line-anchored patch format designed for LLM-driven code edits: each edit names the exact original lines it touches, so an agent can express surgical edits without re-emitting whole files. No filesystem, no agent runtime, no schema library — the host injects a [HashlineFs] implementation.

Ported from omp's packages/hashline/ (TypeScript): same algorithms and test contracts, Rust idioms.

Highlights

• Parse a patch into typed sections and edits (parser, grammar).
• Apply edits with line-anchored matching, BOM/line-ending normalization (apply, normalize).
• Recover gracefully from shifted anchors via snapshot replay (recovery, snapshots).
• Preview the result as a unified diff (diff_preview).
• Validate edits against the live file and surface precise mismatches (mismatch, messages).

Feature flags

Usage

use oxicode_hashline::{split_patch_input, apply_edits, patcher::HashlineFs};

// Host implements HashlineFs (read/write/snapshot the target files).
let fs: Box<dyn HashlineFs> = /* ... */;
let (patch, _rest) = split_patch_input(&patch_text)?;
apply_edits(&patch, fs.as_ref())?;

License

MIT — see LICENSE.md.