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eliminated most lag (runs in ms)

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Edward R. Gonzalez
2026-07-11 17:34:52 -04:00
parent d9406553b3
commit 97d2f66c5a
1 changed files with 47 additions and 13 deletions
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scripts/duffle_paths.lua
+47 -13
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@@ -19,24 +19,58 @@
local M = {}
-- Cache key for the repo root. Stored in `package.loaded` (process-global) so all 8 entry scripts + passes scripts share one git call.
-- Without this cache, `git rev-parse --show-toplevel` runs once per script load.
-- Cache key for the repo root. Stored in `package.loaded` (process-global) so all 8 entry scripts + passes scripts share one resolution.
local CACHE_KEY = "__duffle_repo_root__"
--- Resolve the repo root via git (cached after first call).
--- Returns a normalized path with a trailing forward-slash, or nil if not in a git repo.
--- Resolve the repo root from this script's own path. Zero shell spawn.
--- `duffle_paths.lua` always lives at `<repo>/scripts/duffle_paths.lua`, so the repo root is the
--- parent of the directory containing this script. We derive it directly from `debug.getinfo(1, "S").source`
--- (returns `@<path>` for the currently-running chunk).
---
--- Replaces the prior `io.popen("git rev-parse --show-toplevel")` approach, which cost ~100-180ms per
--- LuaJIT process on Windows due to git's CLI startup. The path-derive approach costs <1ms.
---
--- If this script's path can't be parsed (shouldn't happen — dofile/debug.getinfo always populates source),
--- fall back to a defensive walk: starting from this script's directory, walk UP until we find a parent that
--- contains a `scripts/` directory. The first match is the repo root.
--- @return string|nil
local function find_repo_root()
if package.loaded[CACHE_KEY] then return package.loaded[CACHE_KEY] end
local p = io.popen("git rev-parse --show-toplevel 2>nul")
local root
if p then root = p:read("*l"); p:close() end
if not root or root == "" then return nil end
-- Normalize to forward slashes (Windows accepts both, but mixed `\` + `/` confuses LuaJIT's file APIs).
root = root:gsub("\\", "/")
if not root:match("/$") then root = root .. "/" end
package.loaded[CACHE_KEY] = root
return root
local source = debug.getinfo(1, "S").source
-- Strip the leading `@` (Lua's dofile marker) and the trailing `/duffle_paths.lua` filename.
-- What remains is the directory containing this script, i.e. `<repo>/scripts/` (with trailing slash or not).
local scripts_dir = source and source:match("^@?(.*)[/\\]duffle_paths%.lua$")
if scripts_dir then
-- The repo root is the parent of `scripts/`. Strip the trailing `scripts/` (with or without trailing slash).
local root = scripts_dir:gsub("scripts[\\/]?$", "")
root = root:gsub("\\", "/")
if root == "" then root = "./" end
if not root:match("/$") then root = root .. "/" end
package.loaded[CACHE_KEY] = root
return root
end
-- Defensive fallback: walk UP from this script's directory until we find a parent that contains `scripts/`.
-- In practice this branch never fires — debug.getinfo always returns a source for dofile()'d chunks.
local lfs = pcall(require, "lfs") and require("lfs") or nil
if lfs then
local dir = source and source:match("^@?(.*[/\\])") or "./"
dir = dir:gsub("\\", "/")
while dir and dir ~= "" do
local candidate_scripts = dir .. "scripts"
if lfs.attributes(candidate_scripts, "mode") == "directory" then
dir = dir:gsub("/$", "")
package.loaded[CACHE_KEY] = dir .. "/"
return dir .. "/"
end
local parent = dir:match("^(.*)/[^/]+/$")
if not parent then break end
dir = parent .. "/"
end
end
return nil
end
--- Set `package.path` (for `require("duffle")` + `require("passes.X")`) and