prometheus

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// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !builtinassets
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package ui
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import (
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	"net/http"
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	"os"
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	"path"
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	"path/filepath"
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	"strings"
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	"github.com/shurcooL/httpfs/filter"
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	"github.com/shurcooL/httpfs/union"
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)
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// Assets contains the project's assets.
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var Assets = func() http.FileSystem {
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	wd, err := os.Getwd()
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	if err != nil {
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		panic(err)
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	}
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	var assetsPrefix string
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	switch filepath.Base(wd) {
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	case "prometheus":
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		// When running Prometheus (without built-in assets) from the repo root.
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		assetsPrefix = "./web/ui"
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	case "web":
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		// When running web tests.
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		assetsPrefix = "./ui"
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	case "ui":
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		// When generating statically compiled-in assets.
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		assetsPrefix = "./"
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	}
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	static := filter.Keep(
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		http.Dir(path.Join(assetsPrefix, "static")),
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		func(path string, fi os.FileInfo) bool {
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			return fi.IsDir() ||
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				(!strings.HasSuffix(path, "map.js") &&
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					!strings.HasSuffix(path, "/bootstrap.js") &&
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					!strings.HasSuffix(path, "/bootstrap-theme.css") &&
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					!strings.HasSuffix(path, "/bootstrap.css"))
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		},
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	)
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	return union.New(map[string]http.FileSystem{
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		"/static": static,
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	})
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}()
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