feat: nix support for the nix folks (#3924)

Co-authored-by: opencode <opencode@sst.dev>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

packages/opencode/src/tool/bash.ts

@@ -11,6 +11,7 @@ import { $ } from "bun"
 import { Filesystem } from "@/util/filesystem"
 import { Wildcard } from "@/util/wildcard"
 import { Permission } from "@/permission"
+import { fileURLToPath } from "url"
 
 const MAX_OUTPUT_LENGTH = 30_000
 const DEFAULT_TIMEOUT = 1 * 60 * 1000
@@ -19,20 +20,29 @@ const SIGKILL_TIMEOUT_MS = 200
 
 export const log = Log.create({ service: "bash-tool" })
 
+const resolveWasm = (asset: string) => {
+  if (asset.startsWith("file://")) return fileURLToPath(asset)
+  if (asset.startsWith("/")) return asset
+  const url = new URL(asset, import.meta.url)
+  return fileURLToPath(url)
+}
+
 const parser = lazy(async () => {
   const { Parser } = await import("web-tree-sitter")
   const { default: treeWasm } = await import("web-tree-sitter/tree-sitter.wasm" as string, {
     with: { type: "wasm" },
   })
+  const treePath = resolveWasm(treeWasm)
   await Parser.init({
     locateFile() {
-      return treeWasm
+      return treePath
     },
   })
   const { default: bashWasm } = await import("tree-sitter-bash/tree-sitter-bash.wasm" as string, {
     with: { type: "wasm" },
   })
-  const bashLanguage = await Language.load(bashWasm)
+  const bashPath = resolveWasm(bashWasm)
+  const bashLanguage = await Language.load(bashPath)
   const p = new Parser()
   p.setLanguage(bashLanguage)
   return p