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lua: set package.path
Set package.path to look for lua in the config directory:
CONFIG/?.lua, CONFIG/lua/?.lua, and CONFIG/lua/?/init.lua
Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
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src/lua.zig
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src/lua.zig
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// load standard libraries
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lua.openLibs();
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// preload our library
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_ = try lua.getGlobal("package"); // [package]
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_ = lua.getField(-1, "preload"); // [package, preload]
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_ = lua.getField(1, "preload"); // [package, preload]
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lua.pushFunction(ziglua.wrap(Comlink.preloader)); // [package, preload, function]
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lua.setField(-2, "comlink"); // [package, preload]
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lua.setField(2, "comlink"); // [package, preload]
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lua.pop(1); // [package]
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_ = lua.getField(1, "path"); // [package, string]
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const package_path = try lua.toString(2);
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lua.pop(1); // [package]
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// set package.path
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{
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var buf: [std.posix.PATH_MAX]u8 = undefined;
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var fba = std.heap.FixedBufferAllocator.init(&buf);
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const alloc = fba.allocator();
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const prefix = blk: {
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if (app.env.get("XDG_CONFIG_HOME")) |cfg|
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break :blk try std.fs.path.join(alloc, &.{ cfg, "comlink" });
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if (app.env.get("HOME")) |home|
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break :blk try std.fs.path.join(alloc, &.{ home, ".config/comlink" });
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return error.NoConfigFile;
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};
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const base = try std.fs.path.join(app.alloc, &.{ prefix, "?.lua" });
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defer app.alloc.free(base);
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const one = try std.fs.path.join(app.alloc, &.{ prefix, "lua/?.lua" });
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defer app.alloc.free(one);
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const two = try std.fs.path.join(app.alloc, &.{ prefix, "lua/?/init.lua" });
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defer app.alloc.free(two);
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const new_pkg_path = try std.mem.join(app.alloc, ";", &.{ package_path, base, one, two });
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_ = lua.pushString(new_pkg_path); // [package, string]
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lua.setField(1, "path"); // [package];
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defer app.alloc.free(new_pkg_path);
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}
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// empty the stack
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lua.pop(2); // []
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lua.pop(1); // []
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// keep a reference to our app in the lua state
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lua.pushLightUserdata(app); // [userdata]
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lua.setField(registry_index, loop_key); // []
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// load config
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const home = app.env.get("HOME") orelse return error.EnvironmentVariableNotFound;
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var buf: [std.posix.PATH_MAX]u8 = undefined;
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const path = try std.fmt.bufPrintZ(&buf, "{s}/.config/comlink/init.lua", .{home});
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var fba = std.heap.FixedBufferAllocator.init(&buf);
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const alloc = fba.allocator();
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const path = blk: {
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if (app.env.get("XDG_CONFIG_HOME")) |cfg|
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break :blk try std.fs.path.joinZ(alloc, &.{ cfg, "comlink/init.lua" });
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if (app.env.get("HOME")) |home|
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break :blk try std.fs.path.joinZ(alloc, &.{ home, ".config/comlink/init.lua" });
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unreachable;
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};
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switch (ziglua.lang) {
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.luajit, .lua51 => lua.loadFile(path) catch return error.LuaError,
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else => lua.loadFile(path, .binary_text) catch return error.LuaError,