fix: pass opts.name to serpent to correct reference deserialize

[phanen]

Before, obj/func ref is sometimes deserialized as nil since:

1. serpent don't know who fn1 before the full table is returned since
   the serialized data is a compact version to ensure func/obj ref is
   consistant
2. lua table is random, so it's also possible to deserialize fn2
   correctly, but fn1=nil

return { fn1 = my_func, fn2 = fn1 }

Apply opts.name="_" for serpent, it would be like:

  local _ = { fn1 = my_func }
  _.fn2 = _.fn1
  return _

Summary by CodeRabbit

• Refactor

  • Improved serialization and execution wiring to streamline how previews and dynamic code are prepared and run; highlight parsing now uses an inspected/stringified format for clearer output.

• Tests

  • Added coverage to verify serialization preserves shared function references and updated headless tests to use the revised execution approach.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 812c65f6-e92a-40bc-8fcb-4be0a0c5b6a0

📥 Commits

Reviewing files that changed from the base of the PR and between be70ce8 and 675295d.

📒 Files selected for processing (6)

• lua/fzf-lua/libuv.lua
• lua/fzf-lua/previewer/builtin.lua
• lua/fzf-lua/test/exec_lua.lua
• lua/fzf-lua/test/helpers.lua
• tests/headless_spec.lua
• tests/libuv_spec.lua

✅ Files skipped from review due to trivial changes (1)

• tests/libuv_spec.lua

🚧 Files skipped from review as they are similar to previous changes (1)

• lua/fzf-lua/previewer/builtin.lua

---

📝 Walkthrough

Walkthrough

Updates to serialization and runtime wiring: serpent calls now include name = "_" in two modules, previewer highlight serialization switched from serpent to vim.inspect, exec path refactored to accept an exec_lua function, tests adjusted to run jobs directly and a new round-trip test for shared function references added.

Changes

Cohort / File(s)	Summary
LibUV serialization change lua/fzf-lua/libuv.lua	M.serialize now passes name = "_" to serpent.line, altering the produced Lua source string metadata.
Test exec_lua refactor lua/fzf-lua/test/exec_lua.lua, lua/fzf-lua/test/helpers.lua	M.run signature changed to accept an exec_lua function; serpent.block call updated with name = "_"; helpers now pass child_lua into exec_lua.run.
Previewer highlight formatting lua/fzf-lua/previewer/builtin.lua	Previewer.highlights:parse_entry replaced serpent-based serialization with vim.inspect(hl_def, { indent = (" "):rep(fn.shiftwidth()) }) and adjusted line handling.
Headless test adjustments tests/headless_spec.lua	Removed serpent dependency in exec_term, now executes jobstart/jobwait via in-Nvim c.lua(...) wrapper; changed new_child.start() → new_child.init() in server test.
New libuv round-trip test tests/libuv_spec.lua	Added test asserting serialize/deserialize preserves shared function references (fn1 and fn2 point to same function and return expected result).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• ci: fix headless tests on nightly #2614: Related changes to headless process-exit and exec_term handling in tests.
• refactor previewer #2580: Related modifications to previewer/builtin.lua parsing/serialization logic.

Suggested reviewers

• ibhagwan

Poem

🐰 A tiny tweak, a subtle art,
serpent trimmed, inspect takes part.
Functions link and tests run through,
shared references stay true.
Hoppity hop — code says woohoo! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: passing opts.name to serpent to fix deserialization of shared references.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-serialize

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@tests/libuv_spec.lua`:
- Around line 202-212: The test currently only checks behavior of deserialized
functions; update the "serialize/deserialize with shared function reference"
test to also assert identity preservation by adding an assertion that
deserialized.fn1 == deserialized.fn2 after deserialization (retain checks using
libuv.serialize and libuv.deserialize and existing type/return-value assertions
for fn1 and fn2).

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5ffd6eec-3724-410e-b8ca-ccdfb22fb956

📥 Commits

Reviewing files that changed from the base of the PR and between bd281b9 and be70ce8.

📒 Files selected for processing (5)

• lua/fzf-lua/libuv.lua
• lua/fzf-lua/previewer/builtin.lua
• lua/fzf-lua/test/exec_lua.lua
• tests/headless_spec.lua
• tests/libuv_spec.lua