mirror of
https://github.com/Ed94/pikuma_ps1.git
synced 2026-07-13 12:51:26 -07:00
67 lines
2.7 KiB
Lua
67 lines
2.7 KiB
Lua
--- duffle_paths.lua — Single-line bootstrap helper for the tape-atom Lua scripts.
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---
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--- Each entry script (ps1_meta.lua, word_count_eval.lua, and the 5 passes/*.lua files) starts with:
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--- ```lua
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--- local duffle = dofile((arg[0]:match("(.*[/\\])") or "./") .. "duffle_paths.lua")
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--- ```
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--- That single line: (a) locates this helper via `arg[0]`,
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--- (b) loads it (which sets `package.path` + `package.cpath` via `git rev-parse`),
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--- (c) returns the `M` table (a wrapper around the setup function).
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--- After this line, `require("duffle")` and `require("passes.X")` both resolve normally.
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local M = {}
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-- Cache key for the repo root. Stored in `package.loaded` (process-global) so all 8 entry scripts + passes scripts share one git call.
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-- Without this cache, `git rev-parse --show-toplevel` runs once per script load.
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local CACHE_KEY = "__duffle_repo_root__"
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--- Resolve the repo root via git (cached after first call).
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--- Returns a normalized path with a trailing forward-slash, or nil if not in a git repo.
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--- @return string|nil
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local function find_repo_root()
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if package.loaded[CACHE_KEY] then return package.loaded[CACHE_KEY] end
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local p = io.popen("git rev-parse --show-toplevel 2>nul")
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local root
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if p then root = p:read("*l"); p:close() end
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if not root or root == "" then return nil end
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-- Normalize to forward slashes (Windows accepts both, but mixed `\` + `/` confuses LuaJIT's file APIs).
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root = root:gsub("\\", "/")
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if not root:match("/$") then root = root .. "/" end
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package.loaded[CACHE_KEY] = root
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return root
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end
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--- Set `package.path` (for `require("duffle")` + `require("passes.X")`) and
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--- `package.cpath` (for `lpeg.dll`).
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---
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--- This script does NOT touch the OS environment: no `os.setenv`, no `os.putenv`, no `$PATH` mods.
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--- It just sets `package.path` and `package.cpath` (the standard Lua way to register module search dirs).
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--- lpeg is built by `update_deps.ps1` to `toolchain/lpeg/`,
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--- which we wire into `package.cpath` here (so `require("lpeg")` from `duffle.lua` resolves without any global state).
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function M.setup()
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local repo_root = find_repo_root()
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if not repo_root then
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io.stderr:write("[duffle_paths] git rev-parse failed -- not in a git repo?\n")
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os.exit(2)
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end
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local scripts_dir = repo_root .. "scripts/"
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local passes_dir = repo_root .. "scripts/passes/"
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package.path = scripts_dir .. "?.lua;"
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.. scripts_dir .. "?/init.lua;"
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.. passes_dir .. "?.lua;"
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.. passes_dir .. "?/init.lua;"
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.. package.path
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-- lpeg: built by `update_deps.ps1` to `toolchain/lpeg/lpeg.dll`.
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-- Wire its directory into cpath so `require("lpeg")` resolves.
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local lpeg_dir = repo_root .. "toolchain/lpeg/"
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package.cpath = lpeg_dir .. "?.dll;"
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.. package.cpath
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end
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-- Run the setup as a side effect.
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M.setup()
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return M
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