66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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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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*/
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package env
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import (
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strings"
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)
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var (
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reSubcmd = regexp.MustCompile(`\$\([^)]+\)`)
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reFlag = regexp.MustCompile(`[^ \t\n]+`)
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)
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func ExpandEnv(s string) string {
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return expandEnvWithCmd(s)
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}
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func expandEnvWithCmd(s string) string {
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expanded := reSubcmd.ReplaceAllStringFunc(s, func(m string) string {
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subcmd := strings.TrimSpace(s[2 : len(s)-1])
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args := parseSubcmd(subcmd)
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cmd := args[0]
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if cmd != "pkg-config" && cmd != "llvm-config" {
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fmt.Fprintf(os.Stderr, "expand cmd only support pkg-config and llvm-config: '%s'\n", subcmd)
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return ""
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}
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var out []byte
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var err error
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out, err = exec.Command(cmd, args[1:]...).Output()
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if err != nil {
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// TODO(kindy): log in verbose mode
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return ""
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}
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return string(out)
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})
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return os.Expand(expanded, os.Getenv)
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}
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func parseSubcmd(s string) []string {
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return reFlag.FindAllString(s, -1)
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}
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