-- main.lua — entry point
-- Phase 0: arg parsing, config load, REPL start.
-- See docs/PHASE0.md §4, §10.

local function load_config()
    -- Resolution order per PHASE0.md §10:
    --   1. --config <path>   2. $AISH_CONFIG
    --   3. ~/.config/aish/config.lua   4. ./config.lua
    -- Phase 0 stub: pick the first existing path; no CLI parsing yet.
    local home = os.getenv("HOME") or ""
    local candidates = {
        os.getenv("AISH_CONFIG"),
        home .. "/.config/aish/config.lua",
        "./config.lua",
    }
    for _, path in ipairs(candidates) do
        if path then
            local f = io.open(path, "r")
            if f then f:close(); return dofile(path), path end
        end
    end
    error("aish: no config.lua found in any standard location")
end

local function main()
    local config, config_path = load_config()
    io.stderr:write(("aish: loaded config from %s\n"):format(config_path))
    local repl = require("repl")
    repl.run(config)
end

main()