Add Nix Package Manager Support

xmake/modules/detect/tools/find_nix.lua

@@ -0,0 +1,70 @@
+--!A cross-platform build utility based on Lua
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- Copyright (C) 2015-present, Xmake Open Source Community.
+--
+-- @author      ruki
+-- @file        find_nix.lua
+--
+
+-- imports
+import("lib.detect.find_program")
+import("lib.detect.find_programver")
+
+-- find nix
+--
+-- @param opt   the argument options, e.g. {version = true}
+--
+-- @return      program, version
+--
+-- @code
+--
+-- local nix = find_nix()
+-- local nix, version = find_nix({version = true})
+--
+-- @endcode
+--
+function main(opt)
+    -- init options
+    opt = opt or {}
+
+    -- add common nix installation paths if no specific program is given
+    if not opt.program then
+        opt.paths = opt.paths or {}
+        local nix_paths = {
+            "/nix/var/nix/profiles/default/bin", -- multi-user installation
+            "/home/" .. (os.getenv("USER") or "user") .. "/.nix-profile/bin", -- single user installation
+            "/run/current-system/sw/bin", -- only on nixos, maybe separate nix logic from nixos logic?
+            "/usr/local/bin", -- default path of nix when compiling nix from source
+        }
+
+        for _, nixpath in ipairs(nix_paths) do
+            table.insert(opt.paths, nixpath)
+        end
+    end
+
+    -- find program
+    local program = find_program(opt.program or "nix", opt)
+
+    -- find program version
+    local version = nil
+    if program and opt and opt.version then
+        version = find_programver(program, opt, function (output)
+            -- parse version from "nix (Nix) 2.18.1" format
+            return output:match("nix %(Nix%) ([%d%.]+)")
+        end)
+    end
+
+    return program, version
+end

xmake/modules/package/manager/find_package.lua

@@ -59,6 +59,7 @@ function _find_package_with_builtin_rule(package_name, opt)
         local find_from_host = not is_cross(plat, arch)
         if find_from_host and not is_host("windows") then
             table.insert(managers, "brew")
+            table.insert(managers, "nix")
         end
         -- vcpkg/conan support multi-platforms/architectures
         table.insert(managers, "vcpkg")

xmake/modules/package/manager/install_package.lua

@@ -41,9 +41,11 @@ function _install_package(manager_name, package_name, opt)
         table.insert(managers, "portage")
         table.insert(managers, "brew")
         table.insert(managers, "zypper")
+        table.insert(managers, "nix")
     elseif is_host("macosx") then
         table.insert(managers, "vcpkg")
         table.insert(managers, "brew")
+        table.insert(managers, "nix")
     end
     assert(#managers > 0, "no suitable package manager!")
 

xmake/modules/package/manager/nix/find_package.lua

@@ -0,0 +1,257 @@
+--!A cross-platform build utility based on Lua
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- Copyright (C) 2015-present, Xmake Open Source Community.
+--
+-- @author      ruki
+-- @file        find_package.lua
+--
+
+-- imports
+import("core.base.option")
+import("lib.detect.find_tool")
+import("private.core.base.is_cross")
+import("package.manager.pkgconfig.find_package", {alias = "find_package_from_pkgconfig"})
+
+-- get all nix store paths currently available in environment
+function _get_available_nix_paths()
+    local paths = {}
+    local seen = {}
+
+    -- Get paths from environment PATH
+    local env_path = os.getenv("PATH") or ""
+    for dir in env_path:gmatch("[^:]+") do
+        if dir:startswith("/nix/store/") then
+            local store_path = dir:match("(/nix/store/[^/]+)")
+            if store_path and not seen[store_path] then
+                seen[store_path] = true
+                table.insert(paths, store_path)
+            end
+        end
+    end
+
+    -- Get paths from common Nix environment locations
+    local env_locations = {
+        os.getenv("NIX_PROFILES") or "",
+        (os.getenv("HOME") or "") .. "/.nix-profile",
+        "/nix/var/nix/profiles/default",
+        "/run/current-system/sw" -- NixOS system packages
+    }
+
+    for _, location in ipairs(env_locations) do
+        if location ~= "" and os.isdir(location) then
+            -- Check if it's a symlink to store path
+            local target = try {function()
+                return os.iorunv("readlink", {"-f", location}):trim()
+            end}
+
+            if target and target:startswith("/nix/store/") then
+                local store_path = target:match("(/nix/store/[^/]+)")
+                if store_path and not seen[store_path] then
+                    seen[store_path] = true
+                    table.insert(paths, store_path)
+                end
+            end
+
+            -- Also check for manifest (generation info)
+            local manifest = path.join(location, "manifest.nix")
+            if os.isfile(manifest) then
+                local manifest_content = try {function()
+                    return io.readfile(manifest)
+                end}
+
+                if manifest_content then
+                    -- Extract store paths from manifest
+                    for store_path in manifest_content:gmatch('(/nix/store/[^"\'%s]+)') do
+                        if not seen[store_path] then
+                            seen[store_path] = true
+                            table.insert(paths, store_path)
+                        end
+                    end
+                end
+            end
+        end
+    end
+
+    return paths
+end
+
+-- find package in a specific nix store path
+function _find_in_store_path(store_path, name)
+    if not os.isdir(store_path) then
+        return nil
+    end
+
+    local result = {}
+
+    -- Find include directories
+    local includedir = path.join(store_path, "include")
+    if os.isdir(includedir) then
+        result.includedirs = {includedir}
+    end
+
+    -- Find libraries
+    local libdir = path.join(store_path, "lib")
+    if os.isdir(libdir) then
+        result.linkdirs = {libdir}
+        result.links = {}
+        result.libfiles = {}
+
+        -- Scan for library files
+        local libfiles = os.files(path.join(libdir, "*.so*"), 
+                                path.join(libdir, "*.a"), 
+                                path.join(libdir, "*.dylib*"))
+
+        for _, libfile in ipairs(libfiles) do
+            local filename = path.filename(libfile)
+            local linkname = filename:match("^lib(.+)%.so") or 
+                           filename:match("^lib(.+)%.a") or 
+                           filename:match("^lib(.+)%.dylib")
+
+            if linkname then
+                table.insert(result.links, linkname)
+                table.insert(result.libfiles, libfile)
+
+                if filename:endswith(".a") then
+                    result.static = true
+                else
+                    result.shared = true
+                end
+            end
+        end
+    end
+
+    -- Find pkg-config files
+    local pkgconfigdirs = {
+        path.join(store_path, "lib", "pkgconfig"),
+        path.join(store_path, "share", "pkgconfig")
+    }
+
+    for _, pcdir in ipairs(pkgconfigdirs) do
+        if os.isdir(pcdir) then
+            local pcfiles = os.files(path.join(pcdir, name .. ".pc"))
+            if #pcfiles > 0 then
+                -- Use pkg-config to get proper info
+                local old_path = os.getenv("PKG_CONFIG_PATH")
+                os.setenv("PKG_CONFIG_PATH", pcdir .. (old_path and (":" .. old_path) or ""))
+
+                local pcresult = find_package_from_pkgconfig(name)
+
+                if old_path then
+                    os.setenv("PKG_CONFIG_PATH", old_path)
+                else
+                    os.setenv("PKG_CONFIG_PATH", nil)
+                end
+
+                if pcresult then
+                    return pcresult
+                end
+            end
+        end
+    end
+
+    -- Return result if we found anything useful
+    if result.includedirs or result.linkdirs then
+        return result
+    end
+
+    return nil
+end
+
+-- try to build package with modern nix (flakes)
+function _try_modern_nix_build(name)
+    local nix = find_tool("nix")
+    if not nix then
+        return nil
+    end
+
+    -- Try with flakes syntax
+    local storepath = try {function()
+        return os.iorunv(nix.program, {"build", "nixpkgs#" .. name, "--print-out-paths", "--no-link"}):trim()
+    end}
+
+    return storepath
+end
+
+-- try to build package with legacy nix
+function _try_legacy_nix_build(name)
+    local nix_build = find_tool("nix-build")
+    if not nix_build then
+        return nil
+    end
+
+    -- Try legacy nix-build
+    local storepath = try {function()
+        return os.iorunv(nix_build.program, {"<nixpkgs>", "-A", name, "--no-out-link"}):trim()
+    end}
+
+    return storepath
+end
+
+-- main find function
+function main(name, opt)
+    opt = opt or {}
+
+    -- Check for cross compilation
+    if is_cross(opt.plat, opt.arch) then
+        return
+    end
+
+    -- Handle nix:: prefix
+    local actual_name = name
+    local force_nix = false
+    if name:startswith("nix::") then
+        actual_name = name:sub(6) -- Remove "nix::" prefix
+        force_nix = true
+    end
+
+    -- Get all available Nix store paths
+    local nix_paths = _get_available_nix_paths()
+
+    -- Search through available paths first (unless we're forced to build)
+    if #nix_paths > 0 and not force_nix then
+        for _, store_path in ipairs(nix_paths) do
+            local result = _find_in_store_path(store_path, actual_name)
+            if result then
+                if opt.verbose or option.get("verbose") then
+                    print("Found " .. actual_name .. " in: " .. store_path)
+                end
+                return result
+            end
+        end
+    end
+
+    -- If not found in available paths or forced to build, try building
+    local storepath = nil
+
+    -- Try modern nix first
+    storepath = _try_modern_nix_build(actual_name)
+
+    -- Fallback to legacy nix-build
+    if not storepath then
+        storepath = _try_legacy_nix_build(actual_name)
+    end
+
+    if storepath and os.isdir(storepath) then
+        local result = _find_in_store_path(storepath, actual_name)
+        if result then
+            if opt.verbose or option.get("verbose") then
+                print("Built and found " .. actual_name .. " in: " .. storepath)
+            end
+            return result
+        end
+    end
+
+    return nil
+end