From 0d4e4a3cbbdfb6f21155cb32e92810cf0feebc39 Mon Sep 17 00:00:00 2001
From: Bryan Helmkamp <bryan@brynary.com>
Date: Mon, 13 Apr 2026 22:34:50 -0400
Subject: [PATCH] feat: add fabro-graphviz-sys crate with vendored Graphviz
 14.1.5

Vendor the Graphviz C source code into a new fabro-graphviz-sys crate,
compiled via the cc crate. This eliminates the system dependency on the
dot binary. Pre-generated parser files (grammar.c, scan.c, htmlparse.c)
and table files (colortbl.h, entities.h) are committed alongside the
vendored source. A global Mutex serializes FFI calls to work around
Graphviz's non-thread-safe internal state.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 Cargo.lock | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index a83ec13d9..bb7af06ce 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1722,6 +1722,13 @@ dependencies = [
  "thiserror 2.0.18",
 ]
 
+[[package]]
+name = "fabro-graphviz-sys"
+version = "0.176.2"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "fabro-hooks"
 version = "0.176.2"