feature: added process_environment.go

pkg/os/process/process_environment/process_environment.go

@@ -0,0 +1,82 @@
+package process_environment
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"slices"
+	"strings"
+
+	"git.tswf.io/incredible-go/incredible-go-core/pkg/collections/array_list"
+)
+
+var PathEnvironmentVariableName = "PATH"
+
+func AppendPath(cmd *exec.Cmd, newElements ...string) {
+	pathEntries := GetPath(cmd)
+	for _, newPathEntry := range newElements {
+		if !pathEntries.Contains(newPathEntry) {
+			pathEntries.Add(newPathEntry)
+		}
+	}
+
+	SetPath(cmd, pathEntries.ToSliceUnsafe()...)
+}
+
+func SetPath(cmd *exec.Cmd, entries ...string) {
+	pathEntries := GetPath(cmd)
+	for _, entry := range entries {
+		if !pathEntries.Contains(entry) {
+			pathEntries.Add(entry)
+		}
+	}
+
+	newPathEnvValue := strings.Join(pathEntries.ToSliceUnsafe(), string(os.PathListSeparator))
+	SetEnvironmentVariable(cmd, PathEnvironmentVariableName, newPathEnvValue)
+}
+
+func GetPath(cmd *exec.Cmd) *array_list.ArrayList[string] {
+	oldPathEnvValue := GetEnvironmentVariable(cmd, PathEnvironmentVariableName)
+	pathListSeparatorString := string(os.PathListSeparator)
+
+	oldPathEnvEntries := array_list.NewArrayListWithContent(strings.Split(oldPathEnvValue, pathListSeparatorString)...)
+
+	oldPathEnvEntries.RemoveIf(func(s string) bool {
+		return s == ""
+	})
+
+	return oldPathEnvEntries
+}
+
+func SetEnvironmentVariable(cmd *exec.Cmd, envName string, envValue string) *exec.Cmd {
+	envPrefix := getEnvironmentVariablePrefix(envName)
+	cmd.Env = slices.DeleteFunc(cmd.Env, func(s string) bool {
+		return strings.HasPrefix(strings.ToLower(s), envPrefix)
+	})
+
+	cmd.Env = append(cmd.Env, envPrefix+envValue)
+
+	return cmd
+}
+
+func GetEnvironmentVariable(cmd *exec.Cmd, envName string) string {
+	envPrefix := getEnvironmentVariablePrefix(envName)
+	for _, env := range cmd.Env {
+		if strings.HasPrefix(strings.ToLower(env), envPrefix) {
+			split := strings.SplitN(env, "=", 2)
+			if len(split) < 2 {
+				log.Printf("%v is not valid split for env '%s'", cmd.Env, env)
+			}
+		}
+	}
+
+	return ""
+}
+
+func IsEnvironmentVariablePresent(cmd *exec.Cmd, envName string) bool {
+	return GetEnvironmentVariable(cmd, envName) != ""
+}
+
+func getEnvironmentVariablePrefix(envName string) string {
+	return strings.ToLower(envName + "=")
+}