mesg-foundation/core

package xos

import (
    "sort"
    "strings"
)

// EnvMergeSlices merges multiple slices into single one.
// If the same key exist multiple time, it will be added in occurrence order.
func EnvMergeSlices(values ...[]string) []string {
    envs := make(map[string]string)
    for _, value := range values {
        for _, v := range value {
            if e := strings.SplitN(v, "=", 2); len(e) == 1 {
                envs[e[0]] = ""
            } else {
                envs[e[0]] = e[1]
            }
        }
    }

    env := make([]string, 0, len(values))
    for k, v := range envs {
        env = append(env, k+"="+v)
    }

    // Make sure envs are sorted to give repeatable output
    // It is important for hash instance calculation
    sort.Stable(sort.StringSlice(env))
    return env
}